Volume 469, Number 3, July III 2007
|Page(s)||881 - 889|
|Published online||02 May 2007|
XMM-Newton view of galaxy pairs: activation of quiescent black holes?*
Dipartimento di Fisica di l'Universita Roma 3, via della Vasca Navale 84, 00146 Roma, Italy e-mail: firstname.lastname@example.org
2 XMM-Newton Science Operations Center, ESAC, ESA, Apartado 50727, 28080 Madrid, Spain
3 Instituto Nacional de Astrofísica Optica y Electrónica, Luis Enrique Erro No. 1. Tonantzintla, Puebla, C.P. 72840, México
4 Osservatorio Astronomico di Roma (INAF), via Frascati 33, 00040 Monteporzio Catone, Italy
Accepted: 23 March 2007
We report on XMM-Newton observations of three nearby galaxy pairs, AM0707-273, AM1211-465, and AM2040-674. All six galaxies were previously classified as HII galaxies based on optical and IR spectroscopic analysis. All galaxies were detected with XMM-Newton and each member was isolated and analyzed independently. The X-ray spectra reveal strong evidence of AGN activity in the NE member of AM1211-465 pair. We measured a luminosity of 1042 erg/s in the 2–10 keV band and the presence of a neutral FeKα line with a confidence level of 98.8%. The high value, 2.2 ± 0.21022 cm-2, would explain the misclassification of the source. Marginal evidence of AGN nature was found in the X-ray spectra of AM1211-465SW and AM0707-273E. The X-ray emission of the three remaining galaxies can be explained by starburst activity.
Key words: galaxies: active / galaxies: nuclei / galaxies: general / X-rays: galaxies / X-rays: general
© ESO, 2007
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