A Chandra High-Energy Transition Grating Spectrometer Observation of the Quasar H1821+643 and Its Surrounding Cluster

Details A Chandra High-Energy Transition Grating Spectrometer Observation of the Quasar H1821+643 and Its Surrounding Cluster A Chandra High-Energy Transition Grating Spectrometer Observation of the Quasar H1821+643 and Its Surrounding Cluster

Jan 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002apj...565...86f&link_type=abstract

The Astrophysical Journal, Volume 565, Issue 1, pp. 86-95.

Astronomy and Astrophysics

Astronomy

27

Cosmology: Observations, Galaxies: Intergalactic Medium, Galaxies: Quasars: Absorption Lines, Galaxies: Quasars: Emission Lines, Quasars: Individual (H1821+643), X-Rays: Galaxies: Clusters

Scientific paper

We present the high-resolution X-ray spectrum of the low-redshift quasar H1821+643 and its surrounding hot cluster observed with the Chandra High-Energy Transmission Grating Spectrometer. An iron emission line attributed to the quasar at ~6.43 keV (rest frame) is clearly resolved, with an equivalent width of ~100 eV. Although we cannot rule out contributions to the line from a putative torus, the DISKLINE model provides an acceptable fit to this iron line. We also detect a weak emission feature at ~6.9 keV (rest frame). We suggest that both lines could originate in an accretion disk composed of a highly ionized optically thin atmosphere sitting atop a mostly neutral disk. We search for absorption features from a warm/hot component of the intergalactic medium (IGM) along the ~1.5h-1 Gpc line of sight to the quasar. No absorption features are detected at or above the 3 σ level, while a total of six O VI intervening absorption systems have been detected with the Hubble Space Telescope and Far Ultraviolet Spectroscopic Explorer. Based on the lack of O VII and O VIII absorption lines and by assuming collisionally ionization, we constrain the gas temperature of a typical O VI absorber to 105K

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