Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008rmxac..32..120r&link_type=abstract
The Nuclear Region, Host Galaxy and Environment of Active Galaxies (Eds. Erika Benítez, Irene Cruz-González, & Yair Krongold) Re
Astronomy and Astrophysics
Astronomy
Quasars: Absorption Lines, X-Rays: Galaxies
Scientific paper
We analyze the Chandra Low Energy Transmission Grating Spectrometer (LETGS) observation of the quasar MR 2251-178. The warm absorber of MR 2251-178 is well described by a hydrogen column density of ≈ 2×10(21) cm(-2) , an ionization parameter log(xi) ≈ 0.6, and a global best-fit outflow velocity of ≈ -1100 km s(-1) . We find in the spectrum evidence of narrow absorption lines. The K_alpha and K_beta transitions of C VI and N VI ions display an outflow with (at least three) components traveling at ≈ -600, -2000 and -3000 km s(-1) . We measure a (0.1-2) keV flux of 2.58_{-0.04} (+0.03) ×10(-11) erg s cm(-2) s(-1) , and a (2-10) keV flux of 1.64_{-0.05} (+0.05) × 10(-11) erg s cm(-2) s(-1) . This flux implies that the nuclear source of MR 2251-178 is in a relatively low state. We did not find evidence for an extra cold material in the line of sight, that would be associated to the giant [O III] emission region surrounding the nucleus of MR 2251-178. If present, we can set an upper limit of ≈ 1.2×10(20) cm(-2) . The X-ray spectrum does not appear to show evidence for dusty material, though an upper limit in the neutral carbon and oxygen column densities can only be set to N_{CI} ≈ 2×10(19) cm(-2) and N_{OI} ≈ 9×10(19) cm(-2) , respectively.
Burwitz Vadim
Komossa Stefanie
Mathur Savita
Ramirez Jorge M.
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