A dataset provided by the European Space Agency

Name 010366
Title Are there X-ray quiet quasars
URL

http://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0103660101
http://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0103660201
http://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0103660301
http://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0103660401

DOI 10.5270/esa-7ab43zm
Author Dr Bernd Aschenbach
Description GT-The X-ray-to-optical energy distribution of quasars, alpha_ox, is required to relate the quasar statistics, evolution and luminosity function in the two wavebands and to understand its. broad band emission. In a recent study of radio-quiet quasars from ROSAT observations there is a small number of objects showing very weak X-ray emission compared to their optical luminosity. The nature of these X-ray quiet quasars is unknown and it is not clear whether they are the X-ray quiet extremes of a continous distribution or a distinct class of objects. XMM observations seem to be the only way to understand this new population of quasars and to distinguish different explanations for the unknown physical nature of these objects.
Publication XMM-Newton observation of PG 0844+349 . Brinkmann, W., Grupe, D., et all. . A&A . 398-81 . 2003 . 2003A&A...398...81B ,
Evidence of a high-velocity ionized outflow in a second narrow-line quasar PG 0844+349 . Pounds, K. A., King, A. R., et all. . MNRAS . 346-1025 . 2003 . 2003MNRAS.346.1025P ,
XMM-Newton observations of the two X-ray weak quasars PG 1411+442 and Mrk 304 . Brinkmann, W., Papadakis, I. E., . A&A . 414-107 . 2004 . 2004A&A...414..107B ,
Exploring the X-ray sky with the XMM-Newton bright serendipitous survey . Della Ceca, R., Maccacaro, T., et all. . A&A . 428-383 . 2004 . 2004A&A...428..383D ,
The XMM-Newton Needles in the Haystack Survey: the local X-ray luminosity function of 'normal. galaxies . Georgantopoulos, I., Georgakakis, A., . MNRAS . 360-782 . 2005 . 2005MNRAS.360..782G ,
PG 0844+349 revisited - is there any outflow? . Brinkmann, W., Wang, T., et all. . A&A . 450-925 . 2006 . 2006A&A...450..925B ,
X-QUEST: A Comprehensive X-ray Study of Local ULIRGS and QSOs . Teng, Stacy H., Veilleux, Sylvain, . ApJ . 725-1848 . 2010 . 2010ApJ...725.1848T ,
High-precision multi-band measurements of the angular clustering of X-ray sources . Ebrero, J., Mateos, S., et all. . A&A . 500-749 . 2009 . 2009A&A...500..749E ,
The XMM-Newton serendipitous survey. V. The Second XMM-Newt...
Instrument EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage 2000-11-04T23:35:48Z/2002-07-10T15:55:52Z
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 2003-08-09T00:00:00Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, 2003-08-09T00:00:00Z, 010366, 17.56_20190403_1200. https://doi.org/10.5270/esa-7ab43zm