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A 106-d period in the nuclear source X-8 in M33 | | G. Dubus
; P.A.Charles
; K.S.Long
; P.J.Hakala
; | | Date: |
1 Oct 1997 | | Subject: | astro-ph | | Affiliation: | 1 and 2), P.A.Charles , K.S.Long , P.J.Hakala ( DARC Meudon, Oxford University, STScI, Mullard Space Science Lab | | Abstract: | With an X-ray luminosity of about 10^39 erg/s, the source X-8 coincident with the optical center of M33 is the most luminous X-ray source in the Local Group. However, its nature remains a mystery. We present here new and archival ROSAT observations of X-8 spread over 6 years which show variability and a ~ 106-d periodicity. This implies that (most of) the emission from M33 X-8 arises from a single object, perhaps a binary system with a ~ 10 Msol black hole primary. We suggest that the companion is a giant orbiting with a ~ 10 day period, and that the observed modulation is ``super-orbital’’, analogous to that seen in Cyg X-2 and X1820-30. | | Source: | arXiv, astro-ph/9710009 | | Other source: | [GID 910808] astro-ph/9710009 | | Services: | Forum | Review | PDF | Favorites | |
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