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Title:
ASCA observations of the nearby galaxies Dwingeloo 1 and Maffei 1
Authors:
Reynolds, C. S.; Loan, A. J.; Fabian, A. C.; Makishima, K.; Brandt, W. N.; Mizuno, T.
Affiliation:
AA(Institute of Astronomy, Madingley Road, Cambridge CB3 0HA ), AB(Institute of Astronomy, Madingley Road, Cambridge CB3 0HA ), AC(Institute of Astronomy, Madingley Road, Cambridge CB3 0HA ), AD(Department of Physics, University of Tokyo, Hongo, Bunkyo-ku, Tokyo, Japan ), AE(Institute of Astronomy, Madingley Road, Cambridge CB3 0HA ), AF(Department of Physics, University of Tokyo, Hongo, Bunkyo-ku, Tokyo, Japan )
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 286, Issue 2, pp. 349-357. (MNRAS Homepage)
Publication Date:
04/1997
Origin:
MNRAS
MNRAS Keywords:
ACCRETION, ACCRETION DISCS, GALAXIES: INDIVIDUAL: DWINGELOO 1, GALAXIES: INDIVIDUAL: MAFFEI 1, X-RAYS: GALAXIES, X-RAYS: STARS
Bibliographic Code:
1997MNRAS.286..349R

Abstract

We present ASCA observations of the nearby galaxies Dwingeloo 1 (Dw1) and Maffei 1 (Mf1). X-ray sources are clearly detected within 3arcmin 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 0.5-10keV 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.

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