cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.57780/esa-9trc66r
title: 0420021

description: We propose to continue and complete our program for observing the sky at intermediate Galactic latitudes above and below the Galactic bulge with the goal of establishing the large-scale spatial distribution of positron annihilation radiation and in particular of proving the existence of a halo component. The detection of an annihilation halo would constitute a significant break-through for positron astrophysics with far-reaching implications for origin diffusion and annihilation of positrons in our Galaxy.We have published the first sky maps in the 511 keV line (Knoedlseder et al. 2005) and in the positronium continuum (Weidenspointner et al. 2006) which clearly showed that the positron annihilation radiation from our Galaxy is brightest around the Galactic center. The observed emission could not be unambiguously decomposed into bulge halo and disk components. But recent analyses suggest more and more strongly the existence of a very extended halo component.  We propose to address this issue by observing at intermediate latitudes south of the Galactic center (l=0 deg b=-25 deg) for 2 Ms complementing a similar Cycle 3 observation north of the Galactic center (l=0 deg b=+25 deg). Any 511 keV line emission from these regions - for which there is increasing evidence - is dominated by the halo component. The proposed observations are therefore ideally suited to establish the existence of or to set stringent limits on a Galactic halo component. Possible in situ halo positron sources include members of the old stellar population (such as Type Ia supernovae novae or low-mass X-ray binaries) or light dark matter. [truncated! Please see actual data for full text]
DOI: 10.57780/esa-9ub4xwa
title: 8860277

description: OMC FF sequence ISOC V10 onwards: sequence of ff measurements with LED on/off followed by a DC cal.
DOI: 10.57780/esa-9w05803
title: 1720022

description: As a follow-up of our earlier observations (2 Ms scheduled in AO-1 2.5 Ms in AO-2 2 Ms in AO-3 1.6 Ms in AO-14 1.6 Ms in AO-15 2.0 Ms in AO-16 observations in AO-16 started a month ago) we propose a new deep 1.6 Msec exposure of the Galactic Center field which corresponds to 15% share time in the total available for this target in AO-17. Observations of the GC region make the best use of the unique INTEGRAL capabilities and undoubtedly are the most efficient investment of its precious observing time. It is important for the study of Galactic diffuse nuclear and positron annihilation lines however the main objectives of the proposed observations are the monitoring of Sgr A* and two dozens of black-hole and many other peculiar X-ray binaries and search for the new transient sources and phenomena. [truncated! Please see actual data for full text]
DOI: 10.57780/esa-9wluim2
title: 0635000

description: AO-6 Key Programme 6: Virgo ClusterSoft Gamma Repeaters (SGRs) likely contain magnetars neutron stars whose emission is powered by the decay of their exceptionally high magnetic field. These sources emit short duration soft gamma ray bursts with a wide range of fluences the highest being those of the 3 giant flares detected so far. A new perspective in this field was brought about by the 2004 Dec 27 giant flare from SGR 1806-20. The energy liberated in this event was enormous (>> 5?10^46 erg) and indicates that the internal field of magnetars is > 10^16 G i.e. a decade higher than previously thought. Amongst the potentially important consequences of this finding are: (a) newborn fast-spinning magnetars can be powerful sources of gravitational radiation  (b) a sizeable fraction of the short Gamma Ray Burst population might originate in very powerful giant flares in the local universe  (c) the earth atmosphere damage that a powerful giant flare from a nearby SGR can produce is much higher than previously estimated. INTEGRAL/IBIS is presently the best suited instrument to extend the search for giant flares to a large number of galaxies. We propose here a 2 Ms INTEGRAL observation of the Virgo Cluster during which 7-13 giant flares are expected to go off. This study should at least double the number of known giant flares thus yielding much needed information on the recurrence rate and distribution of total emitted energy of these paroxysmal events.The Virgo cluster field has already been shown to be rich in detectable sources and offers an excellent opportunity for further detailed studies. A deep INTEGRAL observation such as that proposed here will afford the study of the high energy emission of 7 known sources and likely lead to the detection of few serendipitous background AGNs. [truncated! Please see actual data for full text]
DOI: 10.57780/esa-9wvar98
title: 8860257

description: This is a public observation where the Earth will drift through the field of view of the INTEGRAL instruments. Results from this observation will help in separating the cosmic and instrumental backgrounds and so ultimately lead to improved background subtraction.Scientifically the main goals are to measure the spectral shape of the cosmic X-ray background emission above 20 keV and to study any high-energy emission from the Earth during storms in auroral regions. [truncated! Please see actual data for full text]
DOI: 10.57780/esa-9zw5845
title: 0299843

description: Galactic Plane Survey for AO 02 and Pattern 43
DOI: 10.57780/esa-a18cj4a
title: 1620021

description: The objective of this proposal is to study the extent of diffuse emission from positron annihilation and the decay of Al-26 in our Galaxy by creating deeper and more uniform exposure maps at medium Galactic latitudes. We ask that INTEGRAL devote 2 Ms in AO16 and 2 Ms in AO17 to observing mid-latitude regions of the Inner Galaxy that are underexposed compared with regions near the Plane. The survey regions are bounded by Galactic longitude and latitude -70 deg < l < 70 deg and 7 deg < b < 33 deg. Around 10%-50% of this survey area has 100-500 ks of exposure time at present. In these regions the proposed observations will add a minimum of 200 ks per AO which after two observing cycles represents an increase in exposure time of > 50%-100% compared with archival data. This proposal will build a legacy dataset that is of interest to a wide community of scientists given the variety of sources present and given how the new data complements ongoing surveys of the Galactic Plane Bulge and Center. [truncated! Please see actual data for full text]
DOI: 10.57780/esa-a1pulfn
title: 8860289

description: OMC FF sequence ISOC V10 onwards: sequence of ff measurements with LED on/off followed by a DC cal.
DOI: 10.57780/esa-a2ztocs
title: 8860263

description: FSS-STR/SAS calibration for rev. 1224
DOI: 10.57780/esa-a3ueun4
title: 0320041

description: We propose INTEGRAL observations of the accreting binary X-ray pulsar Her X-1 for a total of 690 ks in its Main-On state. Principal goals includeinvestigation of the hard X-ray profile evolution with the phase of the 35-day cycle (JEMXIBIS) and cyclotron line spectroscopy (SPI). Secondary task is the INTEGRAL monitoring of known and search for new  sources in the Her X-1 field as a part of hard X-ray survey of unexplored extragalactic fields.    [truncated! Please see actual data for full text]
DOI: 10.57780/esa-a521qk4
title: 8860350

description: SAS calibration in Rev 1859
DOI: 10.57780/esa-a6qcab0
title: 1140005

description: The goal of this proposal is to perform a thorough investigation with the instruments onboard INTEGRAL of the broad band hard X-ray properties of the Bursting Pulsar GRO J1744-28 in case it will undergo an outburst during AO11. We ask to visit the source three times separated one another by about one month for a totaloverall time of 280 ks. In particular we intend to search for cyclotron absorption lines in the X-ray spectrum ofthis object in order to get a direct measurement of the accreting neutron star magnetic field intensity. We alsopropose to: (i) monitor the spectral and timing behaviours of the hard emission from the outburst onset to the decay toward quiescence  (ii) to obtain phase-resolved spectra of the pulsating X-ray emission  and (iii) to pinpoint the differences between the bursting and the persistent fluxes of this source. Other r^ant issues which can be explored with INTEGRAL observations such as the determination of a pulse period derivative Pdot and the comparison with the other peculiar source MXB 1730-335 (the Rapid Burster) are discussed.This is the resubmission of the proposal on GRO J1744-28 approved since INTEGRAL-AO1 [truncated! Please see actual data for full text]
DOI: 10.57780/esa-a7ml6u3
title: 0480001

description: Thruster calibration for rev 522Engineering observation. Note that the pointing may not be stable.
DOI: 10.57780/esa-a9hqbay
title: 0720030

description: We propose to observe Cas A and Tycho in order to improve our understanding of stellar explosions and their aftermaths. To allow significant advances to be made we require an additional 7Ms of exposure to be split over the next years starting with 2Ms in AO-7. Cas A and Tycho are respectively the remnants of a core-collapse and type Ia SNe. Their proximity on the plane of the sky offers an opportunity to study both phenomena through the observation of the gamma-ray decay lines of 44Ti. This isotope is produced in the very depths of SNe and its nucleosynthesis is highly sensitive to the physical conditions of the explosion. As such observational constraints from SPI and IBIS on the 44Ti yields and kinematics can be a significant contribution to the understanding of the mechanisms by which stars explode. SNe are also one of the most likely sources of the galactic positrons through the beta-decay of some of their nucleosynthesis products. Yet it is unclear which fraction of these positrons can escape the SN and its remnant to flow into the ISM. With a substantial exposure on Cas A and Tycho we will be able to constrain their 511keV emission with SPI and to get a valuable information about the transport of positrons in a highly turbulent medium which is central to a full understanding of the galactic annihilation emission observed by INTEGRAL. In addition to positrons SNRs are also established sources of cosmic-rays. The characterisation with IBIS of the hard X-ray spectra from both Cas A and Tycho will allow a better interpretation of the non-thermal emission from these objects and make it possible to estimate the maximum energy to which electrons are accelerated and the value of the magnetic field involved. Last the field harbours several anomalous X-ray pulsars and high-mass X-ray binaries to the study of which IBIS can strongly contribute. We therefore ask for a significant amount of INTEGRAL time to be devo [truncated! Please see actual data for full text]
DOI: 10.57780/esa-abmhstz
title: 8860244

description: OMC FF sequence ISOC V10 onwards: sequence of ff measurements with LED on/off followed by a DC cal.
DOI: 10.57780/esa-acjctyq
title: 1960001

description: INTEGRAL monitoring of the Crab
DOI: 10.57780/esa-actomsw
title: 0299837

description: Galactic Plane Survey for AO 02 and Pattern 37
DOI: 10.57780/esa-adeknlo
title: 8860274

description: Crab observations during 1281
DOI: 10.57780/esa-adkpkkk
title: 1720004

description: The survey of the Galactic Plane has continued as one of the main INTEGRAL scientific objectives because of the scientific potential of both new source discovery and detailed monitoring of already known sources that will provide immediate scientific returns and act as a base for future missions. We propose for a total of 3.0 Ms of observations in AO16 and 3 Ms in AO17 to continue our Key Program covering areas of the Plane with regular scans every orbit. For these AOs we have selected two sections of the Plane incorporating regions centered at l=+30 and l=-30 that are rich in galactic sources (LMXB and HMXB SFXT in particular) and potential MeV/TeV sources.Our purpose is to regularly monitor known systems as well as to dramatically enhance the chances of discovering new systems or new outbursts from known transients. This program will allow a rapid response to bright events and a detailed study of faint transients and their long term activity. Such a programme will be of high value to a very large fraction of the high-energy astronomy community stimulating science immediately and furthermore contributing greatly to the INTEGRAL legacy.In order to maximise the engagement of the scientific community we will continue to make the observations public immediately. The proposal team will provide as they have through AO8-15 the scw-resolution IBIS and JEM-X light curves (in two energy bands) and per-revolution mosaic images publicly available through the web as soon as possible. Any interesting source behaviour that emerges from our observations will be announced promptly in the usual way through Atels so that rapid follow-up by the community is possible as has been already demonstrated. [truncated! Please see actual data for full text]
DOI: 10.57780/esa-ae0yfiw
title: 8860340

description: Crab Calibration 2016.1 (1661-2): IBIS/SPI
DOI: 10.57780/esa-aeq7hu7
title: 1040025

description: We propose  to perform a 250 ks INTEGRAL ToO observation of a transient millisecond X-ray pulsar in outburst. The target can be either one of the ^en known transient accreting millisecond X-raypulsars in the case of a new outburst or a newly observed object of this class. As these transient sources have broad astronomical interest an outburst will trigger ToO criteria with other X-rayobservatories. These observations can be coordinated in order to study the broad band spectrum in detail from hard to soft X--ray energies as well as the timing properties or eclipsing features of the  source during its outburst. This will allow us to disentangle the contribution of soft black bodyreflection (if any) and hard Comptonized spectral components as well as the detection of type-I X-ray bursts or for the first time also burst oscillation at high energy (if present). In particular we will be able to study the energy spectrum in a broad band energy range and with unprecedented high sensitivity above 20 keV. The INTEGRAL observation will also allow  a timing analysis to study the pulse profile time lags total and pulsed spectrum in an interesting energy range also for in future planed missions. [truncated! Please see actual data for full text]
DOI: 10.57780/esa-af7ew7y
title: 8860182

description: OMC FF sequence ISOC V10 onwards: sequence of FF measurements with LED on/off followed by a DC cal.
DOI: 10.57780/esa-ak4zn3b
title: 8860199

description: OMC FF sequence ISOC V10 onwards: sequence of ff measurements with LED on/off followed by a DC cal.
DOI: 10.57780/esa-alfvpnn
title: 8860264

description: OMC FF sequence ISOC V10 onwards: sequence of ff measurements with LED on/off followed by a DC cal.
DOI: 10.57780/esa-amm0oha
title: 1129700

description: This is an artificial proposal
DOI: 10.57780/esa-aocium5
title: 0940023

description: We propose a Target of Opportunity Observation whenever one of the transient accreting pulsars from the provided list of sources enters an outburst. The main scientific goal of the proposal is to identify and study different accretion regimes that might be at work in the observed source depending on the luminosity  level - a new very promising approach to understand the physics inside the emitting accretion column/mound on the neutron star. Different accretion regimes lead to different luminosity-dependencies of the broad-band spectral continuum and the cyclotron feature. We demonstrate that the observed  slopes of the dependencies at different luminosities  can quantitatively be compared with theoretical predictions. We will also search for transitions from one accretion regime to another that so far have not been seen in any source but if observed would provide an ultimate test for the theory of the X-ray emitting structure on accreting pulsars. The proposal is focused on those X-ray pulsars the spectra of which contain an evidence or an indication of a cyclotron scattering feature but for which the evolution of the broad-band X-ray spectrum with luminosity (i.e. throughout an outburst) has  not been so far studied in details. We request a total of 800 ksec of exposure time divided into several pointings to follow the spectral  evolution with flux of the source entered in outburst.  [truncated! Please see actual data for full text]
DOI: 10.57780/esa-aq7oyfs
title: 1220042

description: We propose fixed-time observations of the galactic microquasar SS433 with a total duration of ~ 500 ks centered at  the middle of the orbital hard X-ray eclipse at the disk precessional phase $Psi ~ 0$ of the source in May 2015 (INTEGRAL orbits 1538-1540). The proposal is the continuation of INTEGRAL observations of the unique galactic source SS433 carried out in previous AOs. The main scientific goal of the new observations is to investigate the form of hard X-ray flux variations before and after the X-ray eclipse in order to study the accretion disk nutation effects discovered by previous INTEGRAL observations. These observations should also add to confirm spectral changes across the primary eclipse. The results will be used to  understand the physics of supercritical accretion disk and hot scattering corona around it discovered by INTEGRAL a unique feature of SS433 among other galactic microquasars. The proposal is not associated with any of the AO12 Key Programs. [truncated! Please see actual data for full text]
DOI: 10.57780/esa-arpmijt
title: 0129700

description: This is an artificial proposal
DOI: 10.57780/esa-au127pf
title: 0920018

description: We propose to continue the monitoring of the X-ray brightest Seyfert galaxy NGC 4151 with integral in order to measure its spectra as a function of the hard X-ray flux level. We will correlate the high energy spectral cutoff with other continuum parameters to determine the main physical mechanism driving the variability. We will also disentangle the contributions to the reflection hump from close and distant reflectors and correlate those with the narrow iron line variability to determine the nature of the thick reprocessing medium and the geometry of cold matter surrounding the source. We will finally probe for the existence of a hard non-thermal tail. We request four observations of 200 ks each for which we will propose three 10 ks accompanying XMM-Newton observations. [truncated! Please see actual data for full text]
DOI: 10.57780/esa-aw9ws4k
title: 1240014

description: We propose  to perform a 210 ks INTEGRAL ToO observation of a transient millisecond X-ray pulsar in outburst. The target can be either one of the twelve known transient accreting millisecond X-raypulsars in the case of a new outburst or a newly observed object of this class. As these transient sources have broad astronomical interest an outburst will trigger ToO criteria with other X-rayobservatories. These observations can be coordinated in order to study the broad band spectrum in detail from hard to soft X--ray energies as well as the timing properties or eclipsing features of the  source during its outburst. This will allow us to disentangle the contribution of soft black bodyreflection (if any) and hard Comptonized spectral components as well as the detection of type-I X-ray bursts or for the first time also burst oscillation at high energy (if present). In particular we will be able to study the energy spectrum in a broad band energy range and with unprecedented high sensitivity above 20 keV. The INTEGRAL observation will also allow  a timing analysis to study the pulse profile time lags total and pulsed spectrum in an interesting energy range also for in future planed missions. [truncated! Please see actual data for full text]
DOI: 10.57780/esa-awo7m8s
title: 1820020

description: The 511 keV electron-positron annihilation signal from the bulge region of the Milky Way puzzles both observers and theorists. While INTEGRAL/SPI made great progress in characterising the emission and its spectral appearance there is an ongoing debate about the actual origin of the signal: Many unresolved point sources or truly diffuse emission from annihilation in the interstellar medium. A smooth distribution of subthreshold sources has been suggested in two alternative scenarios: Bisnovatyi-Kogan et al. (2017) focused on the cumulative effect of intermittently flaring stars producing a 511 keV line through positrons from decays. Bartels et al. (2018) proposed the idea of accreting compact objects in quiescence that steadily eject subrelativistic pair-plasma into their surroundings. These may also be related to the unresolved GeV emission which is thought to originate from a population of millisecond pulsars in the Galactic bulge. Both studies suggest that their models could be readily tested through the observation of globular clusters (GCs) at 511 keV. In both cases the predicted flux from individual GCs is too low for SPI to be detectable however the whole Milky Way population is estimated to add up to more than 10% of the diffuse flux of 1e-3 ph/cm2/s. The relative fluxes from GCs would then allow to distinguish between models. Most GCs are located in the same regions where the diffuse 511 keV flux is also strong so that individual point sources will not outshine the background. For this reason we propose long-term observations to target a region that includes expectedly-strong GCs which would show a high contrast against the diffuse emission. Based on detailed modelling of a flaring star scenario and correlations from GeV emission to predict the 511 keV emission in GCs we propose a multi-year program to observe seven GCs in two neighbouring and underexposed spots in the sky for 500 ks each in AO18 and  [truncated! Please see actual data for full text]
DOI: 10.57780/esa-axjpddp
title: 0840021

description: We propose to perform long-term INTEGRAL observations ($sim 600$~ks) of transient bright X-ray pulsars during their powerful outbursts. The observations will be focused on the study of: 1) the cyclotron absorption line behavior at the low luminosities (search for the transition between the direct and reversal correlations of the cyclotron energy and luminosity and determination of the critical luminosity)  2) the corresponding evolution of the pulse profile with the luminosity and photon energy especially near the cyclotron line. The distinctive feature of our proposal in a comparison with previously performed X-ray pulsar TOO observations is that to cover the low luminosity part of the outburst with maximal exposure and minimal amount of data gaps. Such observations will provide enough statistics to trace the behavior of the cyclotron absorption line at low luminosities as well as for the study of corresponding changes of the pulse profile. [truncated! Please see actual data for full text]
DOI: 10.57780/esa-az1xyaf
title: 8860148

description: OMC FF sequence ISOC V10 onwards: sequence of ff measurements with LED on/off followed by a DC cal.
DOI: 10.57780/esa-azhrjds
title: 0060007

description: Calibration observation 1:900 ksec observation onaxis Cygnus X-1 to study the IBIS PSF  demonstrate the IBIS imaging capabilities in crowded fields  cross calibratoin ISGRI-JEM-X ISGRI-PICSIT and analysis of the background.JEM-X uses different TM formats. [truncated! Please see actual data for full text]