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For refcode 1997MNRAS.286..349R:
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Copyright by Royal Astronomical Society. 1997MNRAS.286..349R ASCA observations of the nearby galaxies Dwingeloo 1 and Maffei 1 C. S. Reynolds, A. J. Loan, A. C. Fabian, K. Makishima, W. N. Brandt and T. Mizuno Accepted 1996 November 6. Received 1996 October 24; in original form 1996 March 4 ABSTRACT We present ASCA observations of the nearby galaxies Dwingeloo 1 (Dw1) and Maffei 1 (Mf1). X-ray sources are clearly detected within 3 arcmin of the optical nuclei of both galaxies. Despite the low galactic latitude of these fields (|b| < 1^deg^) we conclude, on probability and spectral grounds, that the detected sources are intrinsic to these galaxies rather than foreground or background interlopers. The Dw1 source, designated Dw1-X1, is interpreted as being either a hyperluminous X-ray binary (with a 0.5-10 keV luminosity of more than 10^39^ erg s-^-1^) or an X-ray- bright supernova. The Mf1 emission is hard and extended, Suggesting that it originates from a population of X-ray binaries. Prompted by the Dw1-X1 results, we discuss the nature of hyperluminous X-ray binary systems. Such sources are commonly seen in nearby galaxies with a frequency of approximately one per galaxy. We present a possible connection between these luminous systems and Galactic superluminal sources. Key words: accretion, accretion discs - galaxies: individual: Dwingeloo 1 - galaxies: individual: Maffei 1 - X-rays: galaxies - X-rays: stars.
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