A dataset provided by the European Space Agency

Name: Deciphering the Remarkable X-ray Spectrum of the Weak-Line Quasar SDSSJ1521+5202
Published: 2021-01-20T23:00:00Z

Proposal ID	084044
Title	Deciphering the Remarkable X-ray Spectrum of the Weak-Line Quasar SDSSJ1521+5202
Download Data Associated to the proposal	https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0840440101 https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0840440201
DOI	https://doi.org/10.57780/esa-z67h4zr
Principal Investigator, PI	Prof William Brandt
Abstract	Recent investigations of weak-line quasars (WLQs) have led us to propose asimple model where a thick inner accretion disk, associated with an extremelyhigh Eddington ratio, is responsible for both their weak lines and remarkableX-ray properties. We propose to test this model with a long observation of theoptically ultraluminous WLQ SDSS J1521+5202. Our Chandra data show this sourcehas a strikingly hard X-ray spectrum suggesting heavy absorption. The proposedhigh-quality XMM-Newton spectrum will determine if we are seeing the modelspredicted Compton-reflection dominated continuum due to Compton-thick absorptionby the inner disk. If confirmed, our model will help establish relationshipsbetween inner accretion-disk properties and the accretion rate in all quasars.
Publications	Sensitive Chandra coverage of a representative sample of weak-line quasars: revealing the full range of X-ray properties \|Ni Q. Brandt W. N. et al. \| MNRAS \| 511-5251 \| 2022 \| 2022MNRAS.511.5251N \| http://ui.adsabs.harvard.edu/#abs/2022MNRAS.511.5251N The XMM-Newton Line Emission Analysis Program (X-LEAP). I. Emission-line Survey of O VII O VIII and Fe L-shell Transitions \|Pan Zeyang Qu Zhijie et al. \| ApJS \| 271-62 \| 2024 \| 2024ApJS..271...62P \| http://ui.adsabs.harvard.edu/#abs/2024ApJS..271...62P From Active Stars to Black Holes: A Discovery Tool for Galactic X-Ray Sources \|Rodriguez Antonio C. \| PASP \| 136-054201 \| 2024 \| 2024PASP..136e4201R \| http://ui.adsabs.harvard.edu/#abs/2024PASP..136e4201R Unveiling the origin of XMM-Newton soft proton flares: II. Systematics in the proton spectral analysis \|Mineo T. Fioretti V. et al. \| A&A \| 691-A230 \| 2024 \| 2024A&A...691A.230M \| http://ui.adsabs.harvard.edu/#abs/2024A&A...691A.230M Search for Young Stellar Objects within 4XMM-DR13 Using CatBoost and SPE \|Ma Xiangyao Zhang Yanxia et al. \| AJ \| 168-210 \| 2024 \| 2024AJ....168..210M \| http://ui.adsabs.harvard.edu/#abs/2024AJ....168..210M The Remarkable X-Ray Spectra and Variability of the Ultraluminous Weak-line Quasar SDSS J1521+5202 \|Wang Shouyi Brandt W. N. et al. \| ApJ \| 974-2 \| 2024 \| 2024ApJ...974....2W \| http://ui.adsabs.harvard.edu/#abs/2024ApJ...974....2W
Instrument	EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage	2019-07-26T16:26:45Z/2019-12-16T04:45:41Z
Version	18.00_20191217_1110
Mission Description	The European Space Agencys (ESA) X-ray Multi-Mirror Mission (XMM-Newton) was launched by an Ariane 504 on December 10th 1999. XMM-Newton is ESAs second cornerstone of the Horizon 2000 Science Programme. It carries 3 high throughput X-ray telescopes with an unprecedented effective area, and an optical monitor, the first flown on a X-ray observatory. The large collecting area and ability to make long uninterrupted exposures provide highly sensitive observations. Since Earths atmosphere blocks out all X-rays, only a telescope in space can detect and study celestial X-ray sources. The XMM-Newton mission is helping scientists to solve a number of cosmic mysteries, ranging from the enigmatic black holes to the origins of the Universe itself. Observing time on XMM-Newton is being made available to the scientific community, applying for observational periods on a competitive basis.
Creator Contact	https://www.cosmos.esa.int/web/xmm-newton/xmm-newton-helpdesk
Date Published	2021-01-20T23:00:00Z
Last Update	2025-08-04
Keywords	"XMM", "inner disk", "XMM-Newton", "accretion rate", "eddington ratio", "chandra data", "simple model", "heavy absorption", "xray spectrum", "SDSS", "xray properties", "compton thick absorption", "weak lines"
Publisher And Registrant	European Space Agency
Credit Guidelines	European Space Agency, Prof William Brandt, 2021, 'Deciphering the Remarkable X-ray Spectrum of the Weak-Line Quasar SDSSJ1521+5202', 18.00_20191217_1110, European Space Agency, https://doi.org/10.57780/esa-z67h4zr