Optical Identifications of Companion Soft X-ray Sources of Mrk 231

Details Optical Identifications of Companion Soft X-ray Sources of Mrk 231 Optical Identifications of Companion Soft X-ray Sources of Mrk 231

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001chjaa...1..501w&link_type=abstract

Chinese Journal of Astronomy & Astrophysics, Vol. 1, pp. 501-506

Astronomy and Astrophysics

Astrophysics

1

Galaxies: Individual (Mrk 231), X-Rays: Galaxies, Quasars

Scientific paper

We present optical identification results for four ROSAT PSPC soft X-ray companions of Mrk 231 based on the deep BATC 6660 Å-band image and the optical spectra obtained by the 60/90 cm Schmidt telescope and the 2.16 m telescope at the Xinglong Station, NAOC. Three optical counterparts are quasars with redshifts z > 1 and the remaining X-ray source is probably a background galaxy cluster. Therefore, none of these soft X-ray companions are physically connected with the central X-ray source Mrk 231. Incorporating the previous results of Arp 220 and Mrk 273 (Xia et al. 1998, 1999), we suggest that the apparent soft X-ray associations with ULIRGs are chance coincidence in most cases.

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