Iwasawa, K. and Mazzarella, J. M. and Surace, J. A. and Sanders, D. B. and Armus, L. and Evans, A. S. and Howell, J. H. and Komossa, S. and Petric, A. and Teng, S. H. and U, V. and Veilleux, S. (2011) The location of an active nucleus and a shadow of a tidal tail in the ULIRG Mrk 273. Astronomy and Astrophysics, 528 . A137. ISSN 0004-6361 http://resolver.caltech.edu/CaltechAUTHORS:20110412-115734548
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Analysis of data from the Chandra X-ray Observatory for the double nucleus ULIRG Mrk 273 reveals an absorbed hard X-ray source coincident with the southwest nucleus, implying that this unresolved, near-infrared source is where an active nucleus resides, while the northern nuclear region contains a powerful starburst that dominates the far infrared luminosity. There is evidence of a slight image extension in the 6–7 keV band, where an Fe K line is present, towards the northern nucleus. A large-scale, diffuse emission nebula detected in soft X-rays contains a dark lane that spatially coincides with a high surface-brightness tidal tail extending ~50 arcsec (40 kpc) to the south. The soft X-ray source is likely located behind the tidal tail, which absorbs X-ray photons along the line of sight. The estimated column density of cold gas in the tidal tail responsible for shadowing the soft X-rays is N_H ≥ 6 × 10^(21) cm^(-2), consistent with the tidal tail having an edge-on orientation.
|Additional Information:||© 2011 ESO. Article published by EDP Sciences. Received 5 October 2010; Accepted 17 January 2011. Published online 16 March 2011. This research made use of archival data maintained at the Chandra X-ray Center (CXC) and Space Telescope Science Institute (STScI), data products from the Two Micron All Sky Survey (2MASS), and the NASA/IPAC Extragalactic Database (NED).|
|Subject Keywords:||galaxies: active; X-rays: galaxies; galaxies: individual: Mrk 273; infrared: galaxies|
|Official Citation:||The location of an active nucleus and a shadow of a tidal tail in the ULIRG Mrk 273 K. Iwasawa, J. M. Mazzarella, J. A. Surace, D. B. Sanders, L. Armus, A. S. Evans, J. H. Howell, S. Komossa, A. Petric, S. H. Teng, V. U and S. Veilleux A&A 528 A137 (2011) DOI: 10.1051/0004-6361/201015872|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Jason Perez|
|Deposited On:||12 Apr 2011 20:29|
|Last Modified:||26 Dec 2012 13:09|
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