期刊
ASTROPHYSICAL JOURNAL LETTERS
卷 722, 期 2, 页码 L147-L151出版社
IOP PUBLISHING LTD
DOI: 10.1088/2041-8205/722/2/L147
关键词
galaxies: active; galaxies: interactions; galaxies: nuclei; X-rays: individual (IRAS 20210+1121)
资金
- ASI/INAF [I/088/06/0]
- NASA [NNX09AP39G]
- ESA
- NASA [NNX09AP39G, 109418] Funding Source: Federal RePORTER
We report the discovery of an active galactic nucleus (AGN) pair in the interacting galaxy system IRAS 20210+1121 at z = 0.056. An XMM-Newton observation reveals the presence of an obscured (N-H similar to 5 x 10(23) cm(-2)), Seyfert-like (L-2-10 keV = 4.7 x 10(42) erg s(-1)) nucleus in the northern galaxy, which lacks unambiguous optical AGN signatures. Our spectral analysis also provides strong evidence that the IR-luminous southern galaxy hosts a Type 2 quasar embedded in a bright starburst emission. In particular, the X-ray primary continuum from the nucleus appears totally depressed in the XMM-Newton band as expected in the case of a Compton-thick absorber, and only the emission produced by Compton scattering (reflection) of the continuum from circumnuclear matter is seen. As such, IRAS 20210+1121 seems to provide an excellent opportunity to witness a key, early phase in the quasar evolution predicted by the theoretical models of quasar activation by galaxy collisions.
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