New XMM-Newton spectroscopy of the most luminous and distant quasars

O. Shemmer, W. N. Brandt

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

In the two parts of this contribution we describe two related XMM-Newton programs. The first part summarizes our study of the X-ray spectral properties and variability of z>4 quasars (Shemmer et al. 2005). The second part presents preliminary results from our ongoing XMM-Newton program to investigate the X-ray spectral properties and variability of luminous, high accretion-rate quasars at z∼2-3. We find that the X-ray photon index does not depend on luminosity or redshift, and there is suggestive evidence that it may depend on the accretion rate. None of our quasars is significantly absorbed, and none shows signatures of reflection. By jointly fitting high-quality spectra of eight radio-quiet z>4 quasars, including three from our XMM-Newton observations, we place tight constraints on the mean X-ray spectral properties of such sources. Most of our quasars are significantly X-ray variable on timescales of months-years, but none shows rapid (∼1 hr timescale) variations.

Original languageEnglish (US)
Title of host publicationX-ray Universe 2005
Pages551-556
Number of pages6
Edition604
Publication statusPublished - Apr 10 2006
EventX-ray Universe 2005 - Madrid, Spain
Duration: Sep 26 2005Sep 30 2005

Publication series

NameEuropean Space Agency, (Special Publication) ESA SP
Number604
Volume2
ISSN (Print)0379-6566

Other

OtherX-ray Universe 2005
CountrySpain
CityMadrid
Period9/26/059/30/05

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All Science Journal Classification (ASJC) codes

  • Aerospace Engineering
  • Space and Planetary Science

Cite this

Shemmer, O., & Brandt, W. N. (2006). New XMM-Newton spectroscopy of the most luminous and distant quasars. In X-ray Universe 2005 (604 ed., pp. 551-556). (European Space Agency, (Special Publication) ESA SP; Vol. 2, No. 604).