A dataset provided by the European Space Agency

Name: Weak Line Quasars at High Redshift: Extremely High Accretion Rate SourcesquestionMark
Published: 2015-08-25T22:00:00Z

Proposal ID	074335
Title	Weak Line Quasars at High Redshift: Extremely High Accretion Rate Sources?
Download Data Associated to the proposal	https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0743350501
DOI	https://doi.org/10.5270/esa-8avt4we
Principal Investigator, PI	Prof Ohad Shemmer
Abstract	The Sloan Digital Sky Survey has discovered a remarkable group of virgul100 quasarswith extremely weak emission lines in their rest-frame optical-UV spectra. Wepropose to extend our XMM-Newton observations of such sources and obtain imagingspectroscopy of six quasars of this class with a total exposure time of 128 ks,providing virgul1000 photons per source. This will enable an accurate measurement ofthe hard-X-ray photon index required for a robust determination of the accretionrate in each source. Steep spectral slopes will indicate that high accretionrates may be responsible for the intrinsic weakness of the optical-UV emissionlines. The proposed observations will lead to new insights about the accretionprocess and broad emission line formation in all active galactic nuclei.
Publications	XMM-Newton publication statistics \|Ness, J.-U., Parmar, A. N., et al. \| AN \| 335-210 \| 2014 \| 2014AN....335..210N \| http://ui.adsabs.harvard.edu/#abs/2014AN....335..210N The Million Optical - Radio/X-ray Associations (MORX) Catalogue \|Flesch, Eric W., \| PASA \| 33-52 \| 2016 \| 2016PASA...33...52F \| http://ui.adsabs.harvard.edu/#abs/2016PASA...33...52F Steep Hard-X-Ray Spectra Indicate Extremely High Accretion Rates in Weak Emission-line Quasars \|Marlar, Andrea, Shemmer, Ohad, et al. \| ApJ \| 865-92 \| 2018 \| 2018ApJ...865...92M \| http://ui.adsabs.harvard.edu/#abs/2018ApJ...865...92M Classification of 4XMM-DR9 sources by machine learning \|Zhang, Yanxia, Zhao, Yongheng, \| MNRAS \| 503-5263 \| 2021 \| 2021MNRAS.503.5263Z \| http://ui.adsabs.harvard.edu/#abs/2021MNRAS.503.5263Z 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 Robust constraints on feebly interacting particles using XMM-Newton \|Luque, Pedro De la Torre, Balaji, Shyam, \| PhRvD \| 109-L101305 \| 2024 \| 2024PhRvD.109j1305L \| http://ui.adsabs.harvard.edu/#abs/2024PhRvD.109j1305L Multimessenger search for electrophilic feebly interacting particles from supernovae \|Luque, Pedro De la Torre, Balaji, Shyam, \| PhRvD \| 109-103028 \| 2024 \| 2024PhRvD.109j3028L \| http://ui.adsabs.harvard.edu/#abs/2024PhRvD.109j3028L Importance of Cosmic-Ray Propagation on Sub-GeV Dark Matter Constraints \|De la Torre Luque, Pedro, Balaji, Shyam, \| ApJ \| 968-46 \| 2024 \| 2024ApJ...968...46D \| http://ui.adsabs.harvard.edu/#abs/2024ApJ...968...46D
Instrument	EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage	2014-08-08T19:35:14Z/2014-08-09T06:25:14Z
Version	17.56_20190403_1200
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	2015-08-25T22:00:00Z
Keywords	"accretion rates", "accretion rate", "total exposure time", "XMM", "weak line quasars", "weak emission lines", "spectral slopes", "imaging spectroscopy", "active galactic nuclei", "XMM-Newton", "optiuv emission lines", "accretion process", "xmm newton"
Publisher And Registrant	European Space Agency
Credit Guidelines	European Space Agency, Prof Ohad Shemmer, 2015, 'Weak Line Quasars at High Redshift: Extremely High Accretion Rate SourcesquestionMark', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-8avt4we