bluuebunny/crossref_metadata_2025_split huggingface dataset:
Extragalactic Peaked-spectrum Radio Sources at Low Frequencies
Authors: Callingham J. R. , Ekers R. D. , Gaensler B. M. , Line J. L. B. , Hurley-Walker N. , Sadler E. M. , Tingay S. J. , Hancock P. J. , Bell M. E. , Dwarakanath K. S. , For B.-Q. , Franzen T. M. O. , Hindson L. , Johnston-Hollitt M. , Kapińska A. D. , Lenc E. , McKinley B. , Morgan J. , Offringa A. R. , Procopio P. , Staveley-Smith L. , Wayth R. B. , Wu C. , Zheng Q. 
Published: February 2017

Abstract
We present a sample of 1483 sources that display spectral peaks between 72 MHz and 1.4 GHz, selected from the GaLactic and Extragalactic All-sky Murchison Widefield Array (GLEAM) survey. The GLEAM survey is the widest fractional bandwidth all-sky survey to date, ideal for identifying peaked-spectrum sources at low radio frequencies. Our peaked-spectrum sources are the low-frequency analogs of gigahertz-peaked spectrum (GPS) and compact-steep spectrum (CSS) sources, which have been hypothesized to be the precursors to massive radio galaxies. Our sample more than doubles the number of known peaked-spectrum candidates, and 95% of our sample have a newly characterized spectral peak. We highlight that some GPS sources peaking above 5 GHz have had multiple epochs of nuclear activity, and we demonstrate the possibility of identifying high-redshift (z > 2) galaxies via steep optically thin spectral indices and low observed peak frequencies. The distribution of the optically thick spectral indices of our sample is consistent with past GPS/CSS samples but with a large dispersion, suggesting that the spectral peak is a product of an inhomogeneous environment that is individualistic. We find no dependence of observed peak frequency with redshift, consistent with the peaked-spectrum sample comprising both local CSS sources and high-redshift GPS sources. The 5 GHz luminosity distribution lacks the brightest GPS and CSS sources of previous samples, implying that a convolution of source evolution and redshift influences the type of peaked-spectrum sources identified below 1 GHz. Finally, we discuss sources with optically thick spectral indices that exceed the synchrotron self-absorption limit.
Absolute Dimensions of the Eccentric Eclipsing Binary V541 Cygni
Authors: Torres Guillermo , McGruder Chima D. , Siverd Robert J. , Rodriguez Joseph E. , Pepper Joshua , Stevens Daniel J. , Stassun Keivan G. , Lund Michael B. , James David 
Published: February 2017

Abstract
We report new spectroscopic and photometric observations of the main-sequence, detached, eccentric, double-lined eclipsing binary V541 Cyg (P = 15.34 days, e = 0.468). Using these observations together with existing measurements, we determine the component masses and radii to better than 1% precision:

,

,

, and

. The nearly identical B9.5 stars have estimated effective temperatures of 10650 ± 200 K and 10350 ± 200 K. A comparison of these properties with current stellar evolution models shows excellent agreement at an age of about 190 Myr and [Fe/H] ≈ −0.18. Both components are found to be rotating at the pseudo-synchronous rate. The system displays a slow periastron advance that is dominated by general relativity (GR), and has previously been claimed to be slower than predicted by theory. Our new measurement,

deg century−1, has an 88% contribution from GR and agrees with the expected rate within the uncertainties. We also clarify the use of the gravity darkening coefficients in the light-curve fitting Eclipsing Binary Orbit Program (EBOP), a version of which we use here.
Was 49b: An Overmassive AGN in a Merging Dwarf Galaxy?
Authors: Secrest Nathan J. , Schmitt Henrique R. , Blecha Laura , Rothberg Barry , Fischer Jacqueline 
Published: February 2017

Abstract
We present a combined morphological and X-ray analysis of Was 49, an isolated, dual-AGN system notable for the presence of a dominant AGN, Was 49b, in the disk of the primary galaxy, Was 49a, at a projected radial distance of 8 kpc from the nucleus. Using X-ray data from Chandra, the Nuclear Spectroscopic Telescope Array, and Swift, we find that this AGN has a bolometric luminosity of L
bol ∼ 1045 erg s−1, with a black hole mass of

. Despite the large mass, our analysis of optical data from the Discovery Channel Telescope shows that the supermassive black hole (SMBH) is hosted by a stellar counterpart with a mass of only

, which makes the SMBH potentially larger than expected from SMBH–galaxy scaling relations, and the stellar counterpart exhibits a morphology that is consistent with dwarf elliptical galaxies. Our analysis of the system in the r and K bands indicates that Was 49 is a minor merger, with the mass ratio of Was 49b to Was 49a between ∼1:7 and ∼1:15. This is in contrast with findings that the most luminous merger-triggered AGNs are found in major mergers and that minor mergers predominantly enhance AGN activity in the primary galaxy.
Perspective on the Cosmic-ray Electron Spectrum above TeV
Authors: Fang Kun , Wang Bing-Bing , Bi Xiao-Jun , Lin Su-Jie , Yin Peng-Fei 
Published: February 2017

Abstract
The AMS-02 has measured the cosmic-ray electron (plus positron) spectrum up to ∼TeV with unprecedented precision. The spectrum can be well described by a power law without any obvious features above 10 GeV. The satellite instrument Dark Matter Particle Explorer (DAMPE), which was launched a year ago, will measure the electron spectrum up to 10 TeV with high-energy resolution. The cosmic electrons beyond TeV may be attributed to few local cosmic-ray sources, such as supernova remnants. Therefore, spectral features, such as cut-off and bumps, can be expected at high energies. In this work, we provide a careful study on the perspective of the electron spectrum beyond TeV. We first examine our astrophysical source models on the latest leptonic data of AMS-02 to give a self-consistent picture. Then we focus on the discussion about the candidate sources, which could be electron contributors above TeV. Depending on the properties of the local sources (especially on the nature of Vela), DAMPE may detect interesting features in the electron spectrum above TeV in the future.
Modeling the Anomalous Microwave Emission with Spinning Nanoparticles: No PAHs Required
Authors: Hensley Brandon S. , Draine B. T. 
Published: February 2017

Abstract
In light of recent observational results indicating an apparent lack of correlation between the anomalous microwave emission (AME) and mid-infrared emission from polycyclic aromatic hydrocarbons, we assess whether rotational emission from spinning silicate and/or iron nanoparticles could account for the observed AME without violating observational constraints on interstellar abundances, ultraviolet extinction, and infrared emission. By modifying the SpDust code to compute the rotational emission from these grains, we find that nanosilicate grains could account for the entirety of the observed AME, whereas iron grains could be responsible for only a fraction, even for extreme assumptions on the amount of interstellar iron concentrated in ultrasmall iron nanoparticles. Given the added complexity of contributions from multiple grain populations to the total spinning dust emission, as well as existing uncertainties due to the poorly constrained grain size, charge, and dipole moment distributions, we discuss generic, carrier-independent predictions of spinning dust theory and observational tests that could help identify the AME carrier(s).
Orthogonal Vertical Velocity Dispersion Distributions Produced by Bars
Authors: Du Min , Shen Juntai , Debattista Victor P. , Lorenzo-Cáceres Adriana de 
Published: February 2017

Abstract
In barred galaxies, the contours of stellar velocity dispersions (σ) are generally expected to be oval and aligned with the orientation of bars. However, many double-barred (S2B) galaxies exhibit distinct σ peaks on the minor axis of the inner bar, which we termed “σ-humps,” while two local σ minima are present close to the ends of inner bars, i.e., “σ-hollows.” Analysis of numerical simulations shows that

-humps or hollows should play an important role in generating the observed σ-humps+hollows in low-inclination galaxies. In order to systematically investigate the properties of

in barred galaxies, we apply the vertical Jeans equation to a group of well-designed three-dimensional bar+disk(+bulge) models. A vertically thin bar can lower

along the bar and enhance it perpendicular to the bar, thus generating

-humps+hollows. Such a result suggests that

-humps+hollows can be generated by the purely dynamical response of stars in the presence of a sufficiently massive, vertically thin bar, even without an outer bar. Using self-consistent N-body simulations, we verify the existence of vertically thin bars in the nuclear-barred and S2B models that generate prominent σ-humps+hollows. Thus, the ubiquitous presence of σ-humps+hollows in S2Bs implies that inner bars are vertically thin. The addition of a bulge makes the

-humps more ambiguous and thus tends to somewhat hide the

-humps+hollows. We show that

may be used as a kinematic diagnostic of stellar components that have different thicknesses, providing a direct perspective on the morphology and thickness of nearly face-on bars and bulges with integral field unit spectroscopy.
Exploring the Evolution of Star Formation and Dwarf Galaxy Properties with JWST/MIRI Serendipitous Spectroscopic Surveys
Authors: Bonato Matteo , Sajina Anna , Zotti Gianfranco De , McKinney Jed , Baronchelli Ivano , Negrello Mattia , Marchesini Danilo , Roebuck Eric , Shipley Heath , Kurinsky Noah , Pope Alexandra , Noriega-Crespo Alberto , Yan Lin , Kirkpatrick Allison 
Published: February 2017

Abstract
The James Webb Space Telescope’s Medium Resolution Spectrometer (MRS), will offer nearly two orders of magnitude improvement in sensitivity and >3× improvement in spectral resolution over our previous space-based mid-IR spectrometer, the Spitzer IRS. In this paper, we make predictions for spectroscopic pointed observations and serendipitous detections with the MRS. Specifically, pointed observations of Herschel sources require only a few minutes on source integration for detections of several star-forming and active galactic nucleus lines, out to z = 3 and beyond. But the same data will also include tens of serendipitous 0 ≲ z ≲ 4 galaxies per field with infrared luminosities ranging ∼106–1013
L
☉. In particular, for the first time and for free we will be able to explore the L
IR < 109
L
☉ regime out to z ∼ 3. We estimate that with ∼ 100 such fields, statistics of these detections will be sufficient to constrain the evolution of the low-L end of the infrared luminosity function, and hence the star formation rate function. The above conclusions hold for a wide range in the potential low-L end of the IR luminosity function, and account for the PAH deficit in low-L, low-metallicity galaxies.
Proper Motions and Structural Parameters of the Galactic Globular Cluster M71*
Authors: Cadelano M. , Dalessandro E. , Ferraro F. R. , Miocchi P. , Lanzoni B. , Pallanca C. , Massari D. 
Published: February 2017

Abstract
By exploiting two ACS/HST data sets separated by a temporal baseline of ∼7 years, we have determined the relative stellar proper motions (PMs; providing membership) and the absolute PM of the Galactic globular cluster M71. The absolute PM has been used to reconstruct the cluster orbit within a Galactic, three-component, axisymmetric potential. M71 turns out to be in a low-latitude disk-like orbit inside the Galactic disk, further supporting the scenario in which it lost a significant fraction of its initial mass. Since large differential reddening is known to affect this system, we took advantage of near-infrared, ground-based observations to re-determine the cluster center and density profile from direct star counts. The new structural parameters turn out to be significantly different from the ones quoted in the literature. In particular, M71 has a core and a half-mass radii almost 50% larger than previously thought. Finally, we estimate that the initial mass of M71 was likely one order of magnitude larger than its current value, thus helping to solve the discrepancy with the observed number of X-ray sources.
Les Prévost, peintres de fleurs : des jardins de La Celle-Saint-Cloud à l’expédition La Pérouse en passant par Trianon
Authors: Lamy Gabriela 
Published: February 2017

L’apprentissage du dessin de plantes à la manufacture royale de Sèvres de 1754 à 1762 a permis à trois Prévost – Jean-Jacques, Guillaume et Jean-Louis –, fils d’un vigneron de Nointel (Val-d’Oise), de se distinguer en participant ensemble ou individuellement à d’importantes entreprises de la fin du xviiie siècle concernant l’art des jardins : illustration de la collection de plantes du jardin du château de La Celle-Saint-Cloud (recueil de plantes conservé à la Bibliothèque nationale de France) et de Trianon (dessins non retrouvés à ce jour), participation scientifique à l’expédition Lapérouse et carrière de peintre de fleurs reconnue. L’étude des parcours familiaux et professionnels des différents membres de cette fratrie permettra de découvrir un corpus de réalisations iconographiques qu’il serait intéressant d’analyser par la suite. La diversité de ces productions réalisées en fonction des demandes des commanditaires (propriétaires de jardins, manufactures de porcelaine, brodeurs et peintres de fleurs en quête de nouveaux modèles) témoigne de l’existence de nouvelles plantes acclimatées dans les jardins des collectionneurs ou dessinées au cours d’expéditions scientifiques.
Aerosol scattering effects on water vapor retrievals over the Los Angeles Basin
Authors: Zeng Zhao-Cheng , Zhang Qiong , Natraj Vijay , Margolis Jack S. , Shia Run-Lie , Newman Sally , Fu Dejian , Pongetti Thomas J. , Wong Kam W. , Sander Stanley P. , Wennberg Paul O. , Yung Yuk L. 
Published: February 2017

Abstract. In this study, we propose a novel approach to describe the scattering effects of atmospheric aerosols in a complex urban environment using water vapor (H2O) slant column measurements in the near infrared. This approach is demonstrated using measurements from the California Laboratory for Atmospheric Remote Sensing Fourier Transform Spectrometer on the top of Mt. Wilson, California, and a two-stream-exact single scattering (2S-ESS) radiative transfer (RT) model. From the spectral measurements, we retrieve H2O slant column density (SCD) using 15 different absorption bands between 4000 and 8000 cm−1. Due to the wavelength dependence of aerosol scattering, large variations in H2O SCD retrievals are observed as a function of wavelength. Moreover, the variations are found to be correlated with aerosol optical depths (AODs) measured at the AERONET-Caltech station. Simulation results from the RT model reproduce this correlation and show that the aerosol scattering effect is the primary contributor to the variations in the wavelength dependence of the H2O SCD retrievals. A significant linear correlation is also found between variations in H2O SCD retrievals from different bands and corresponding AOD data; this correlation is associated with the asymmetry parameter, which is a first-order measure of the aerosol scattering phase function. The evidence from both measurements and simulations suggests that wavelength-dependent aerosol scattering effects can be derived using H2O retrievals from multiple bands. This understanding of aerosol scattering effects on H2O retrievals suggests a promising way to quantify the effect of aerosol scattering on greenhouse gas retrievals and could potentially contribute towards reducing biases in greenhouse gas retrievals from space.
Direct Transretinal Removal of Subfoveal Perfluorocarbon Liquid: The Role and Timing of Internal Limiting Membrane Peeling
Authors: De Cillà Stefano , Alkabes Micol , Radice Paolo , Carini Elisa , Mateo Carlos 
Published: February 2017

Purpose To describe a case series including 4 patients undergoing direct transretinal aspiration of subfoveal perfluorocarbon liquid (PFCL) and internal limiting membrane (ILM) peeling after macula-off retinal detachment surgery. Methods Four patients who had undergone vitreoretinal surgery due to primary rhegmatogenous retinal detachment were further treated because of retained subfoveal PFCL. Direct transretinal aspiration of PFCL through a self-sealing foveal retinotomy was performed in all cases using a 41-G needle placed on the top of the bubble. The ILM was peeled off prior to and after PFCL removal in 2 cases, respectively. Optical coherence tomography (OCT) scans were obtained preoperatively and postoperatively to assess the status of the macula. Results Subfoveal PFCL was successfully removed in all cases. Two patients had silicone oil tamponade at the time of the second surgery, which was temporarily removed in both cases and then reapplied in one. Best-corrected visual acuity improved in all cases. No postoperative macular hole was observed by OCT. Conclusions Direct transretinal aspiration of subfoveal PFCL with a 41-G cannula combined with conventional ILM peeling is a safe and effective technique to avoid long-term damage to the retinal layers with good functional outcomes. Performing the ILM peeling immediately before or after the PFCL aspiration does not seem to influence anatomic results.
Comparison of Visual Outcomes after Bilateral Implantation of Extended Range of Vision and Trifocal Intraocular Lenses
Authors: Ruiz-Mesa Ramón , Abengózar-Vela Antonio , Aramburu Ana , Ruiz-Santos María 
Published: February 2017

Purpose To compare visual outcomes after cataract surgery with bilateral implantation of 2 intraocular lenses (IOLs): extended range of vision and trifocal. Methods Each group of this prospective study comprised 40 eyes (20 patients). Phacoemulsification followed by bilateral implantation of a FineVision IOL (group 1) or a Symfony IOL (group 2) was performed. The following outcomes were assessed up to 1 year postoperatively: binocular uncorrected distance visual acuity (UDVA), binocular uncorrected intermediate visual acuity (UIVA) at 60 cm, binocular uncorrected near visual acuity (UNVA) at 40 cm, spherical equivalent (SE) refraction, defocus curves, mesopic and photopic contrast sensitivity, halometry, posterior capsule opacification (PCO), and responses to a patient questionnaire. Results The mean binocular values in group 1 and group 2, respectively, were SE -0.15 ± 0.25 D and -0.19 ± 0.18 D; UDVA 0.01 ± 0.03 logMAR and 0.01 ± 0.02 logMAR; UIVA 0.11 ± 0.08 logMAR and 0.09 ± 0.08 logMAR; UNVA 0.06 ± 0.07 logMAR and 0.17 ± 0.06 logMAR. Difference in UNVA between IOLs (p<0.05) was statistically significant. There were no significant differences in contrast sensitivity, halometry, or PCO between groups. Defocus curves were similar between groups from 0 D to -2 D, but showed significant differences from -2.50 D to -4.00 D (p<0.05). Conclusions Both IOLs provided excellent distance and intermediate visual outcomes. The FineVision IOL showed better near visual acuity. Predictability of the refractive results and optical performance were excellent; all patients achieved spectacle independence. The 2 IOLs gave similar and good contrast sensitivity in photopic and mesopic conditions and low perception of halos by patients.
Prevalence of Eyelid Laxity and its Association with Ophthalmic Findings and Disease Severity in Patients with Keratoconus
Authors: Naderan Mohammad , Jahanrad Ali , Farjadnia Mahgol 
Published: February 2017

Purpose To investigate the prevalence of eyelid laxity and quantify eyelid measurements in normal and keratoconic eyes and the correlations of these findings with ophthalmic parameters and disease severity in patients with keratoconus (KC). Methods In a prospective case-control study, prevalence of eyelid laxity and eyelid measurements were evaluated in 53 patients with KC and the same number of matched healthy controls. The eyelid measurements were compared between the groups, as well as mean keratometry (K), central and thinnest corneal thickness (CCT and TCT), astigmatism, manifest refraction spherical equivalent (MRSE), best spectacle-corrected visual acuity (BCVA), and severity of KC according to the Keratoconus Severity Score. Results Prevalence of eyelid laxity was 71.7% (38 patients) in patients with KC and 20.8% (11 patients) in normal participants (p<0.001, odds ratio 9.673 [95% confidence interval 3.959 to 23.631]). Comparison of the eyelid measurements in the patients with KC with and without eyelid laxity revealed significantly higher measurements of anterior eyelid distraction test, Hertel exophthalmometry measurements, lateral canthal angle to orbital rim and tendon movement, palpebral fissure width, retraction test (lower eyelid), and vertical lid pull (upper eyelid) in patients with KC with eyelid laxity (p<0.05). No significant difference was found regarding mean K, CCT, TCT, astigmatism, MRSE, or BCVA values of the patients with KC with and without eyelid laxity (p>0.05). Moreover, severity of KC was not associated with the presence of eyelid laxity or eyelid measurements (p>0.05). Conclusions Higher prevalence and greater eyelid laxity were found in patients with KC compared to healthy participants. However, eyelid laxity was not associated with severity of KC.
Incidence of Heterotopic Ossification in Minimally Invasive Short-Stem THA using the Modified Anterolateral Approach
Authors: Kutzner Karl P. , Hechtner Marlene , Pfeil Dominik , Rehbein Philipp , Kovacevic Mark P. , Schneider Michael , Siebert Werner , Pfeil Joachim 
Published: February 2017

Introduction Heterotopic ossification (HO) is known to be a common complication after total hip arthroplasty (THA). The minimal invasive (MIS) modified anterolateral approach has become popular in combination with a short stem. We analysed the incidence of HO following short-stem THA using this approach in combination with a postoperative administration of nonsteroidal anti-inflammatory drugs (NSAIDs). Materials and methods 216 short stems were implanted in 162 patients. NSAIDs were administered for 2 weeks after surgery in 154 patients (95.1%). Standardised pre- and postoperative radiographic imaging was done at 2-year follow-up. HO was analysed according to the Brooker classification. Influence of age, gender, body mass index (BMI), and blood transfusion were analysed. Harris Hip Score (HHS) and visual analogue scale (VAS) of satisfaction were assessed. Operation time and blood-transfusion rate was documented. Short-term gastrointestinal side effects were recorded. Results The overall incidence of HO was 7.8% (16 cases). HO Brooker type 3 and 4 occurred in only 1 case (0.5%). No correlation with age, gender or BMI was revealed. HHS improved largely from 45.8 (SD 15.9) before surgery to 98.1 (SD 4.7) after a minimum of 2 years. At that point VAS satisfaction was 9.7 (SD 0.9). Mean operative time was 45.8 minutes (SD 18.7). 12 patients (7.4%) received at least 1 blood-transfusion. Gastrointestinal side effects occurred in 13 of 154 patients (8.4%). Conclusions The combination of short-stem THA, the MIS modified anterolateral approach and a postoperative application of NSAIDs resulted in the effective prevention of HO and excellent clinical results.