Detection of a Transient X-ray Absorption Line Intrinsic to the Bl Lacertae Object H 2356-309
Name
canizares5.pdf
Size
428.21 KB
Format
Adobe PDF
Checksum (MD5)
d35e08dbe2262ab87a5336f1d9103fe7
Author(s)
Fang, Taotao
Buote, David A.
Humphrey, Philip J.
Canizares, Claude R.
Date Issued
March 2011
Journal
Astrophysical Journal
Publisher
IOP Publishing
Citation
Fang, Taotao et al. “DETECTION OF A TRANSIENT X-RAY ABSORPTION LINE INTRINSIC TO THE BL LACERTAE OBJECT H 2356-309.” The Astrophysical Journal 731.1 (2011): 46.
Version
Author's final manuscript
Abstract
Since the launch of the Einstein X-ray Observatory in the 1970s, a number of broad absorption features have been reported in the X-ray spectra of BL Lac objects. These features are often interpreted as arising from high-velocity outflows intrinsic to the BL Lac object, therefore providing important information about the inner environment around the central engine. However, such absorption features have not been observed more recently with high-resolution X-ray telescopes such as Chandra and XMM-Newton. In this paper, we report the detection of a transient X-ray absorption feature intrinsic to the BL Lac object H 2356-309 with the Chandra X-ray Telescope. This BL Lac object was observed during XMM-Newton cycle 7 and Chandra cycles 8 and 10, as part of our campaign to investigate X-ray absorption produced by the warm-hot intergalactic medium residing in the foreground large-scale superstructure. During one of the 80 ks Chandra cycle 10 observations, a transient absorption feature was detected at 3.3σ (or 99.9% confidence level, accounting for the number of "trials"), which we identify as the O VIII Kα line produced by an absorber intrinsic to the BL Lac object. None of the other 11 observations showed this line. We constrain the ionization parameter (25 lsim Ξ lsim 40) and temperature (105 K
MIT Department
Massachusetts Institute of Technology. Department of Physics
Terms of Use
Creative Commons Attribution-Noncommercial-Share Alike 3.0
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1088/0004-637x/731/1/46
