A Chandra HETG Observation of H 1821+643

Details A Chandra HETG Observation of H 1821+643 A Chandra HETG Observation of H 1821+643

Sep 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001tysc.confe.170f&link_type=abstract

Two Years of Science with Chandra, Abstracts from the Symposium held in Washington, DC, 5-7 September, 2001, meeting abstract.

Mathematics

Logic

Active Galaxies And Quasars

Scientific paper

We reported a Chandra HETG observation of a low redshift quasar H 1821+643 (z=0.297). An iron emission line is detected at 6.435 ± 0.041 keV (quasar rest frame). The disk-line model provides acceptable fit, but we cannot rule out the contributions from a putative torus. We also marginally detect a emission line at around 6.9 keV. The HST and FUSE observations showed a total of 6 O VI intervening absorption systems. No O VII or O VIII absorption is detected at above 3σ level, and we place the upper limits of their column densities. By assuming collisional ionization, we place the temperature constraint (105 < T < 106 K) on one of the absorption systems with z≈ 0.1214. This is in accord with cosmological simulations that predict most of these O VI absorbers are located in the filaments that connect the virialized regions and has been shock-heated to temperatures about 105 K.

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