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On the nature of the absorber in IRAS 09104+4109: the X-ray and mid-infrared view
- Source :
- MNRAS, 416, 2068 (2011)
- Publication Year :
- 2011
-
Abstract
- We present a long (~76 ks) Chandra observation of IRAS 09104+4109, a hyper-luminous galaxy, optically classified as a Type 2 AGN hosted in a cD galaxy in a cluster at z=0.442. We also report on the results obtained by fitting its broad-band spectral energy distribution. The Compton-thick nature of this source (which has been often referred to as an "archetype" of Compton-thick Type 2 quasars) was formerly claimed on the basis of its marginal detection in the PDS instrument onboard BeppoSAX, being then disputed using XMM-Newton data. Both Chandra analysis and optical/mid-IR spectral fitting are consistent with the presence of heavy (~1-5 10^{23} cm^{-2}) but not extreme (Compton-thick) obscuration. However, using the mid-IR and the [OIII] emission as proxies of the nuclear hard X-ray luminosity suggests the presence of heavier obscuration. The 54-month Swift BAT map shows excess hard X-ray emission likely related to a nearby (z=0.009) Type 2 AGN, close enough to IRAS 09104+4109 to significantly enhance and contaminate its emission in the early BeppoSAX PDS data.<br />Comment: 10 pages, 4 figures, 2 tables, MNRAS. Some references added
Details
- Database :
- arXiv
- Journal :
- MNRAS, 416, 2068 (2011)
- Publication Type :
- Report
- Accession number :
- edsarx.1106.1647
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1111/j.1365-2966.2011.19181.x