Chandra LETGS spectroscopy of the Quasar MR2251-178 and its warm absorber

Abstract

We present an analysis of our Chandra Low Energy Transmission Grating Spectrometer (LETGS) observation of the quasar MR2251-178. The warm absorber of MR2251-178 is well described by a hydrogen column density, N_H~2x10^21 cm^-2, and an ionization parameter log(xi)~0.6. We find in the spectrum weak evidence for narrow absorption lines from Carbon and Nitrogen which indicate that the ionized material is in outflow. We note changes (in time) of the absorption structure in the band (0.6-1) keV (around the UTAs plus the OVII and OVIII K-edges) at different periods of the observation. We measure a (0.1-2) keV flux of 2.58x10^-11 ergs cm^-2 s^-1. This flux implies that the nuclear source of MR2251-178 is in a relatively low state. No significant variability is seen in the light curve. We do not find evidence for an extra cold material in the line of sight, and set an upper limit of N_H~1.2x10^20 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~2x10^19 cm^-2 and N_OI~9x10^19 cm^-2, respectively.

arXiv comment42 pages, 12 figures, Accepted in Apj. Typo in abstract (ver2): "We do not find evidence for an extra..."

References in corpus (21)

• ASCA Observations of Seyfert 1 galaxies: III. The Evidence for Absorption & Emission due to Photoionized Gas
• The Compact, Conical, Accretion-Disk Warm Absorber of the Seyfert 1 Galaxy NGC 4051 and its Implications for IGM-Galaxy Feedback Processes
• The Ionized Gas and Nuclear Environment in NGC 3783. IV. Variability and Modeling of the 900 ks CHANDRA Spectrum
• Toward a Self Consistent Model of the Ionized Absorber in NGC 3783
• Complex resonance absorption structure in the X-ray spectrum of IRAS13349+2438
• Revealing the Dusty Warm Absorber in MCG--6-30-15 with the Chandra HETG
• Soft X-Ray Absorption by Fe${}^{0+}$ to Fe${}^{15+}$ in Active Galactic Nuclei
• HST STIS Ultraviolet Spectral Evidence of Outflow in Extreme Narrow-line Seyfert 1 Galaxies: II. Modeling and Interpretation
• The Swift/BAT High Latitude Survey: First Results
• Inner-shell Absorption Lines of Fe~VI-- Fe~XVI: A Many-body Perturbation Theory Approach
• X-Ray/Ultraviolet Observing Campaign of the Markarian 279 Active Galactic Nucleus Outflow: a close look at the absorbing/emitting gas with Chandra-LETGS
• Multiwavelength studies of the Seyfert 1 galaxy NGC7469. II - X-ray and UV observations with XMM-Newton
• Opacity Variations in the Ionized Absorption in NGC 3783: A Compact Absorber
• The Properties and the Evolution of the Highly Ionized Gas in MR2251-178
• Establishing HZ43 A, Sirius B, and RX J185635-3754 as soft X-ray standards: a cross-calibration between the Chandra LETG+HRC-S, the EUVE spectrometer, and the ROSAT PSPC
• Discovery of Associated Absorption Lines in an X-ray Warm Absorber: HST Observations of PG1114+445
• The weak absorbing outflow in AGN Mrk 279: evidence of super-solar metal abundances
• BATSE Gamma-Ray Burst Line Search: V. Probability of Detecting a Line in a Burst
• Variable UV Absorption in the Spectrum of MRC 2251-178
• Extended High-Ionization Nuclear Emission-Line Region in the Seyfert Galaxy NGC 4051
• The X-ray view of the quasar MR2251-178 and its host cluster: variability, absorption, and intracluster gas emission

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