A dataset provided by the European Space Agency

Name 020431
Title XMM-NEWTON OBSERVATIONS OF THE SECOND-BRIGHTEST QUASAR, PHL 1811
URL

http://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0204310101

DOI 10.5270/esa-nfrdmwj
Author Prof KAREN LEIGHLY
Description Followup spectroscopy of VLA FIRST survey quasar candidates discovered a very bright quasar in the South Galactic Cap. Strangely, this quasar was not detected in the ROSAT All Sky Survey. Followup coordinated HST and Chandra observations showed that it is intrinsically very X-ray weak, pointing to unusual and extreme conditions in the X-ray emitting corona. We propose an XMM-Newton observation of this unusual quasar to study the spectrum of an intrinsically X-ray weak object, to potentially confirm rapid X-ray variability tentatively identified in the Chandra observation in this very luminous quasar, and to monitor its X-ray state.
Publication The XMM-Newton serendipitous survey. V. The Second XMM-Newton serendipitous source catalogue . Watson, M. G., Schroder, A. C., et all. . A&A . 493-339 . 2009 . 2009A&A...493..339W ,
The X-ray Energy Dependence of the Relation Between Optical and X-ray Emission in Quasars . Young, M., Elvis, M., . ApJ . 708-1388 . 2010 . 2010ApJ...708.1388Y ,
An Extremely Luminous Panchromatic Outburst from the Nucleus of a Distant Galaxy . Levan, A. J., Tanvir, N. R., et all. . Sci . 333-199 . 2011 . 2011Sci...333..199L ,
New constraints on the X-ray spectral properties of type 1 active galactic nuclei . Scott, A. E., Stewart, G. C., et all. . MNRAS . 417-992 . 2011 . 2011MNRAS.417..992S ,
Statistical evaluation of the flux cross-calibration of the XMM-Newton EPIC cameras . Mateos, S., Saxton, R. D., et all. . A&A . 496-879 . 2009 . 2009A&A...496..879M ,
The XMM Cluster Survey: optical analysis methodology and the first data release . Mehrtens, Nicola, Romer, A. Kathy, et all. . MNRAS . 423-1024 . 2012 . 2012MNRAS.423.1024M ,
The Intrinsically X-Ray Weak Quasar PHL 1811. I. X-Ray Observations and Spectral Energy Distribution . Leighly, Karen M., Halpern, Jules P., et all. . ApJ . 663-103 . 2007 . 2007ApJ...663..103L ,
The Sloan Digital Sky Survey-XMM-Newton Quasar Survey: Correlation Between X-Ray Spectral Slope and Eddington Ratio . Risaliti, G., Young, M., . ApJ . 700-6 . ...
Instrument EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage 2004-11-01T09:06:42Z/2004-11-01T18:15:21Z
Version 17.56_20190403_1200
Mission Description The European Space Agency's (ESA) X-ray Multi-Mirror Mission (XMM-Newton) was launched by an Ariane 504 on December 10th 1999. XMM-Newton is ESA's 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 Earth's 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 2005-12-02T00:00:00Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, 2005-12-02T00:00:00Z, 020431, 17.56_20190403_1200. https://doi.org/10.5270/esa-nfrdmwj