cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.57780/esa-wsv4nub
title: 17147

description: The Parallel Ionizing Emissivity (PIE) Survey will measure the average escape fraction of ionizing radiation (f_esc) at 3.1<z<3.5 using a sample of virgul700 galaxies.  Using 3-band imaging (F336W comma  F625W comma  and F814W) comma  PIE will color-select U-dropout galaxies comma  where LyC is sampled by the F336W band. Pure parallel orbits will enable us to observe a total area of virgul500 arcminelev2 divided over virgul75 truly independent fields distributed across the extragalactic sky. This sampling will minimize the effect of IGM absorption (correlated on scales of 10s of Mpc) on the measurement of f_esc. Likewise comma  our proposed high spatial resolution HST imaging will avoid contamination by low-redshift galaxies. In addition to the HST imaging comma  we are requesting 10 nights of coordinated observations with NOIRLab Gemini telescopes (in addition to guaranteed institutional access to 8-m class telescopes) to measure the spectroscopic redshifts of the LyC emitting candidates that we will identify.   The proposed data comma  combined with the spectroscopic followup of the selected Lyman break galaxies comma  will allow us to measure escape fractions of 10% at 3-sigma by stacking virgul150 targets as faint as 0.4L*. We will calibrate the evolution of f_esc indicators out to zvirgul3.5--measuring f_esc as a function of star formation surface density comma  Ly-alpha properties comma  UV luminosity comma  and UV colors. The proposed dataset will be a resource for the astronomical community for the foreseeable future comma  more than doubling the existing area with deep HST U-band coverage comma  and greatly increasing the number of sight-lines.
DOI: 10.57780/esa-wutzcnx
title: 16114

description: The Space Telescope Science Institute (STScI) Director has decided to devote up to 1000 orbits of Director.s Discretionary time in observing Cycles 27-29 to a new Hubble Ultraviolet Legacy program focused on star formation and associated stellar physics. This new program comma  ULLYSES (UV Legacy Library of Young Stars as Essential Standards) comma  will provide a UV spectroscopic reference sample of young (< 10 Myr) high- and low-mass stars. It will target over virgul150 OB stars in the Magellanic Clouds and lower metallicity galaxies in the Local Group comma  and virgul40 T Tauri stars and brown dwarfs in the Milky Way. In addition comma  ULLYSES will monitor 4 typical T Tauri stars over different rotational phases through at least three rotation periods comma  and over timescales of months to years. The resulting library will provide template spectra of massive stars at metallicities substantially below the well studied comma  while the low mass sample will cover a wide range of ages comma  accretion rates comma  and masses comma  including objects down to well below 0.5 M_sun. The legacy of this large UV dataset on the first 10 Myr of stellar evolution will be enhanced by complementary datasets obtained by the scientific community. In addition to the core goals of the program related to stellar astrophysics of low and high mass stars comma  this data will also enable exciting science in the fields of ISM comma  CGM comma  jets comma  and exoplanets. ULLYSES will be modeled after the Frontier Fields programdoublePoint all data obtained will be non-proprietary. The implementation team at STScI is developing high-level science data products and a sophisticated database and website for disseminating data from the ULLYSES program and ancillary datasets for the ULLYSES target sample from space and ground-based facilities.
DOI: 10.15156/bio/sh1284301.09fu
title: SH1284301.09FU

description: UNITE provides a unified way for delimiting, identifying, communicating, and working with DNA-based Species Hypotheses (SH). All fungal ITS sequences in the international nucleotide sequence databases are clustered to approximately the species level by applying a set of dynamic distance values (<0.5 - 3.0%). All species hypotheses are given a unique, stable name in the form of a DOI, and their taxonomic and ecological annotations are verified through distributed, web-based third-party annotation efforts. SHs are connected to a taxon name and its classification as far as possible (phylum, class, order, etc.) by taking into account identifications for all sequences in the SH. An automatically or manually designated sequence is chosen to represent each such SH. These sequences are released (https://unite.ut.ee/repository.php) for use by the scientific community in, for example, local sequence similarity searches and next-generation sequencing analysis pipelines. The system and the data are updated automatically as the number of public fungal ITS sequences grows.
DOI: 10.57780/esa-wv4l5bk
title: 17172

description: Cluster environments in the local universe are dominated by passive comma  quiescent galaxies while proto-clusters at z>2 typically contain  large  fractions of actively star-forming galaxies. The physics underlying this observed transformation of the cluster member population has been a long standing puzzle in astronomy. The cluster quenching efficiency appears to rapidly increase over cosmic time but whether this is due to the pre-processing of galaxies in group environments prior to infall or occurs during accretion into the cluster itself is V1.0. Our understanding has been limited by the lack of virialized clusters discovered at the critical transformational redshift of zvirgul2 comma  until now.  We propose HST observations of XLSSC 122 - the highest redshift (z=1.98) comma  virialized comma  massive galaxy cluster.  We will utilize G141 grism observations to determine the redshifts of galaxies out to twice the cluster virial radius and combine these with WFC3 F140W-F105W and ACS F814W imaging to constrain the star-formation activity in these galaxies. These data will provide unique comma  unparalleled insight into the cosmic evolution of environmental quenching and unveil its impact in the cluster outskirts and in nearby groups and filaments.
DOI: 10.15156/bio/sh1284302.09fu
title: SH1284302.09FU

description: UNITE provides a unified way for delimiting, identifying, communicating, and working with DNA-based Species Hypotheses (SH). All fungal ITS sequences in the international nucleotide sequence databases are clustered to approximately the species level by applying a set of dynamic distance values (<0.5 - 3.0%). All species hypotheses are given a unique, stable name in the form of a DOI, and their taxonomic and ecological annotations are verified through distributed, web-based third-party annotation efforts. SHs are connected to a taxon name and its classification as far as possible (phylum, class, order, etc.) by taking into account identifications for all sequences in the SH. An automatically or manually designated sequence is chosen to represent each such SH. These sequences are released (https://unite.ut.ee/repository.php) for use by the scientific community in, for example, local sequence similarity searches and next-generation sequencing analysis pipelines. The system and the data are updated automatically as the number of public fungal ITS sequences grows.
DOI: 10.57780/esa-wwlfkxw
title: 16943

description: An unexpected luminous optical flare (peak Mg=-21.4) turns up in ULIRG F01004-2237 since 2021 September comma  revealed by its ATLAS and ASASSN light curves. This nearby galaxy once held a candidate tidal disruption event (TDE) because a luminous flare occurred in 2010 comma  and now it brightens up again. The Gaia has also detected the new flare and pinpointed it at the galaxy.s center. The flare is now UV bright yet X-ray weak comma  and its optical spectrum shows extremely broad Balmer emission lines. These observations have ruled out a supernova as its origin comma  and therefore the flare is likely to be associated with the central supermassive black hole (SMBH). Such recurrent flares are rare as only few reported recurrent flares in other galaxies with diverse time intervals. Their nature are still ambiguous. They may be caused by repeated TDEs comma  partial TDE comma  SMBH binary or peculiar accretion disk instabilities. The timely discovery of the ongoing recurring flare in F01004-2237 offers a unique opportunity to acquire useful clues. Aiming to further explore the mechanism that drives the second flare as well as its connection with the first one comma  we here propose to conduct STIS UV spectroscopic observations on F01004-2237 with 5 orbits time. Because the flare is darkening comma  we require the observation to be done as early as possible within the upcoming two visbility windows. The immediate objectives are mainly in three foldsdoublePoint 1) to better map the flare.s SED and thus distinguish between the powerlaw (AGN) and blackbody (TDE) scenarios  2) to detect possible characteristic UV emission lines of either TDEs or AGNs  3) to detect possible UV absorption lines which might address the X-ray weakness.
DOI: 10.57780/esa-wzmpk7j
title: 16171

description: Nearly two decades of reverberation mapping (RM) studies on nearby AGN have revealed a tight correlation between the size of the Hbeta broad-line region and the optical luminosity of the AGN comma  designated the R-L relation. This correlation is the foundation for the so-called d_commasingle-epoch virial black hole mass estimatorsd_comma that have been widely applied to distant quasars to estimate their black hole masses without dedicated RM measurements. Recent RM measurements for quasars beyond the nearby Universe and for a subset of nearby AGN with estimated high accretion rates have independently revealed a systematic offset from the canonical R-L relation based on the nearby RM AGN sample. The most likely explanation of this offset is that these new RM samples explore AGN that have different accretion rates and therefore different shapes of the continuum spectral energy distribution (SED) comma  responsible for ionizing the line-emitting gas comma  than the nearby RM AGN sample. We propose STIS UV spectroscopy for a sample of 18 quasars at zvirgul0.4 from one of these recent RM samples to test this hypothesis and to develop empirical corrections to the R-L relation based on additional AGN parameters. We will model the UV spectra with detailed photoionization calculations to constrain the ionizing continuum directly incident on the broad-line region gas. The combination of UV and (existing) optical spectroscopy for a unique non-local AGN sample with direct RM-based black hole masses also will enable better SED-fitting to constrain accretion parameters and better calibrations of single-epoch mass recipes based on UV broad emission lines.
DOI: 10.15156/bio/sh1284303.09fu
title: SH1284303.09FU

description: UNITE provides a unified way for delimiting, identifying, communicating, and working with DNA-based Species Hypotheses (SH). All fungal ITS sequences in the international nucleotide sequence databases are clustered to approximately the species level by applying a set of dynamic distance values (<0.5 - 3.0%). All species hypotheses are given a unique, stable name in the form of a DOI, and their taxonomic and ecological annotations are verified through distributed, web-based third-party annotation efforts. SHs are connected to a taxon name and its classification as far as possible (phylum, class, order, etc.) by taking into account identifications for all sequences in the SH. An automatically or manually designated sequence is chosen to represent each such SH. These sequences are released (https://unite.ut.ee/repository.php) for use by the scientific community in, for example, local sequence similarity searches and next-generation sequencing analysis pipelines. The system and the data are updated automatically as the number of public fungal ITS sequences grows.
DOI: 10.57780/esa-wzuzwa4
title: 16450

description: With atmospheres hotter than 2000 K comma  ultra-hot Jupiters provide the unique opportunity to measure both refractory atomic metals and volatile molecules like H2O in their cloud-free transmission spectrum. The recently observed UV-optical (0.2-0.8 micron) transmission spectrum of ultra-hot Jupiter WASP-178b indicates strong absorption at short-wavelengths by atomic metals comma  consistent with refractory abundances between 1 and 4 times solar. Here comma  we propose to complete WASP-178b.s UV-IR transit spectrum (0.2-1.7 micron) with WFC3-IR-G102 and G141 comma  enabling the measurement of volatile abundances through H2O. With a measurement of refractory abundances at short wavelength and volatile abundances in the IR comma  we can determine the planet.s rock-to-ice ratio comma  providing insight into WASP-178b.s formation and migration history. With the addition of WASP-178b.s IR spectrum comma  we can better compare the planet to the broader ultra-hot Jupiter population comma  including whether the planet has TiO and VO in its atmosphere.
DOI: 10.57780/esa-x0s4e91
title: 17081

description: We propose Hubble imaging of the black hole candidate microlens system MOA-2019-BLG-284 in order to measure the astrometric microlensing signal and determine the lens system mass. Microlensing is the only method that can detect black holes that are isolated or in stable comma  non-accreting binary systems comma  so routine detection of black hole astrometric microlensing will provide a significant advance in our understanding of the formation of stellar mass black holes.  Our proposed observations will determine if the MOA-2019-BLG-284 lens system is a rare stable binary system with a black hole primary or an isolated stellar mass black hole. This observing program is designed to address possible systematic errors in the astrometric measurements. We will also use the Hubble data to correct systematic errors in the ground-based photometry that determines the microlensing parallax. Since both astrometric microlensing and microlensing parallx measurements are needed to determine black hole masses comma  an understanding of systematic errors in both quantaties is needed for reliable mass measurements. The novel systematic error correction methods that we propose may be used to increase the sensitivity of future black hole mass measurements from astrometric and photometric microlensing.
DOI: 10.57780/esa-x15nk5p
title: 16827

description: This program is the Cycle 29 implementation of the HST Optical Monitoring Program.  The 6 orbits comprising this proposal will utilize ACS (Wide Field channel) and WFC3 (UVIS channel) to observe stellar cluster members in parallel with multiple exposures over an orbit. Phase retrieval performed on the PSF in each image will be used to measure primarily focus comma  with the ability to explore apparent coma comma  astigmatism comma  and third order spherical changes in WFC3.   The goals of this program are todoublePoint 1. monitor the overall OTA focal length for the purposes of maintaining focus within science tolerances. 2. determine focus offset between the imagers and identify any SI-specific focus behavior and dependencies.  Starting with cycle 25 comma  POSTARGY = -41 is used to make the UVIS detector rotate about its center instead of about the center of the chip UVIS1 as ORIENT changes over the course of the year.  The resulting smaller area covered by UVIS has been matched to a dense part of the cluster to ensure a resonably large number of bright stars on UVIS in each visit.  The combination of the new target position (NGC-188-DENSE) and POSTARGY has moved the center of rotation by (+46 arcsec comma  -23 arcsec) in (RA comma  Dec).  The density of bright stars in the annulus sampled by the ACS-WFC parallel exposures has also been checked.  Where needed comma  the intervals between visits have been adjusted to ensure that each chip of each detector will cover an adequate number of stars.
DOI: 10.15156/bio/sh1284304.09fu
title: SH1284304.09FU

description: UNITE provides a unified way for delimiting, identifying, communicating, and working with DNA-based Species Hypotheses (SH). All fungal ITS sequences in the international nucleotide sequence databases are clustered to approximately the species level by applying a set of dynamic distance values (<0.5 - 3.0%). All species hypotheses are given a unique, stable name in the form of a DOI, and their taxonomic and ecological annotations are verified through distributed, web-based third-party annotation efforts. SHs are connected to a taxon name and its classification as far as possible (phylum, class, order, etc.) by taking into account identifications for all sequences in the SH. An automatically or manually designated sequence is chosen to represent each such SH. These sequences are released (https://unite.ut.ee/repository.php) for use by the scientific community in, for example, local sequence similarity searches and next-generation sequencing analysis pipelines. The system and the data are updated automatically as the number of public fungal ITS sequences grows.
DOI: 10.57780/esa-x3g7xlo
title: 16814

description: The Space Telescope Science Institute (STScI) Director has decided to devote up to 1000 orbits of Director.s Discretionary time in observing Cycles 27-29 to a new Hubble Ultraviolet Legacy program focused on star formation and associated stellar physics. This new program comma  ULLYSES (UV Legacy Library of Young Stars as Essential Standards) comma  will provide a UV spectroscopic reference sample of young (< 10 Myr) high- and low-mass stars. It will target over virgul150 OB stars in the Magellanic Clouds and lower metallicity galaxies in the Local Group comma  and virgul40 T Tauri stars and brown dwarfs in the Milky Way. In addition comma  ULLYSES will monitor 4 typical T Tauri stars over different rotational phases through at least three rotation periods comma  and over timescales of months to years. The resulting library will provide template spectra of massive stars at metallicities substantially below the well studied comma  while the low mass sample will cover a wide range of ages comma  accretion rates comma  and masses comma  including objects down to well below 0.5 M_sun. The legacy of this large UV dataset on the first 10 Myr of stellar evolution will be enhanced by complementary datasets obtained by the scientific community. In addition to the core goals of the program related to stellar astrophysics of low and high mass stars comma  this data will also enable exciting science in the fields of ISM comma  CGM comma  jets comma  and exoplanets. ULLYSES will be modeled after the Frontier Fields programdoublePoint all data obtained will be non-proprietary. The implementation team at STScI is developing high-level science data products and a sophisticated database and website for disseminating data from the ULLYSES program and ancillary datasets for the ULLYSES target sample from space and ground-based facilities.
DOI: 10.15156/bio/sh1284305.09fu
title: SH1284305.09FU

description: UNITE provides a unified way for delimiting, identifying, communicating, and working with DNA-based Species Hypotheses (SH). All fungal ITS sequences in the international nucleotide sequence databases are clustered to approximately the species level by applying a set of dynamic distance values (<0.5 - 3.0%). All species hypotheses are given a unique, stable name in the form of a DOI, and their taxonomic and ecological annotations are verified through distributed, web-based third-party annotation efforts. SHs are connected to a taxon name and its classification as far as possible (phylum, class, order, etc.) by taking into account identifications for all sequences in the SH. An automatically or manually designated sequence is chosen to represent each such SH. These sequences are released (https://unite.ut.ee/repository.php) for use by the scientific community in, for example, local sequence similarity searches and next-generation sequencing analysis pipelines. The system and the data are updated automatically as the number of public fungal ITS sequences grows.
DOI: 10.57780/esa-x4khius
title: 16442

description: STIS spectra taken using spatial scanning potentially have a number of potential advantanges. In addition to enabling the collection of more photons before saturating comma  scanning an external point source perpindicular to the dispersion direction produces an illumination pattern similar to that produced by an internal lamp illuminating a long comma  narrower slit. This may make corrections for IR-fringing and pixel-to-pixel variations more accurate.  This proposal will test the repeatability of fluxes determined from STIS spatial scans by taking a series of spectroscopic exposures with the STIS G750L grating of the known exoplanet host 55 Cnc comma  trailed in the large 52X2 aperture. Deep contemporaneous lamp flats comma  taken through the narrower 52X0.1 aperture comma  will be used to remove the fringing at wavelengths beyond about 7000 A.  Similar (but more limited) observations obtained in program 15383 yielded rms scatter of order 30 ppm in the total d_commawhite lightd_comma fluxes when d_commade-trendedd_comma to remove systematic instrumental effects.  This longer program will include a transit of 55 Cnc e comma  in order to gauge how well the transit can be characterized in this observing mode.
DOI: 10.57780/esa-xa07j64
title: 16761

description: Radio very-long-baseline interferometry has for many decades provided extremely high-precision (sub-milliarcsecond) astrometry comma  maintaining the absolute celestial reference frame used by all astronomers. Only recently comma  with the launch of ESA.s Gaia mission comma  has this been matched at optical wavelengths.  An analysis of more than 11890 Gaia position matches to radio quasars in the VLBI Absolute Position Catalog has revealed 12% to have significant (> 5 sigma) position offsets. The most extreme of these range from a few to several hundred milliarcseconds comma  and the offset distribution shows a strong anisotropy in the direction of the radio jet.  This is not due to radio structure as interferometric positions refer with high precision only to the compact core or jet base. Extensive arguments presented in several publications show that the most likely origin for the offsets are bright optical jets of 100 mas extent or more comma  which have not previously been predicted by theory. Other potential scenarios comma  such as dust obscuration in the host galaxy or dual AGN are thought to be a far less likely origin comma  but only HST can confirm this. We propose HST snapshots of a sample of 75 carefully selected sources (expected sample of 25 observed) to test the hypothesis that significant position disagreements between two flagship astrometry programs are due to the presence of unexpectedly strong optical jet emission.
DOI: 10.15156/bio/sh1284306.09fu
title: SH1284306.09FU

description: UNITE provides a unified way for delimiting, identifying, communicating, and working with DNA-based Species Hypotheses (SH). All fungal ITS sequences in the international nucleotide sequence databases are clustered to approximately the species level by applying a set of dynamic distance values (<0.5 - 3.0%). All species hypotheses are given a unique, stable name in the form of a DOI, and their taxonomic and ecological annotations are verified through distributed, web-based third-party annotation efforts. SHs are connected to a taxon name and its classification as far as possible (phylum, class, order, etc.) by taking into account identifications for all sequences in the SH. An automatically or manually designated sequence is chosen to represent each such SH. These sequences are released (https://unite.ut.ee/repository.php) for use by the scientific community in, for example, local sequence similarity searches and next-generation sequencing analysis pipelines. The system and the data are updated automatically as the number of public fungal ITS sequences grows.