On the optical counterpart of NGC 300 X-1 and the global Wolf-Rayet content of NGC 300
نویسندگان
چکیده
منابع مشابه
A Wolf - Rayet / black - hole X - ray binary candidate in NGC 300
Context. Wolf Rayet/black hole binaries are believed to exist as a later evolutionary product of high-mass X-ray binaries. Hundreds of such binaries may exist in galaxies, but only a few of them are close enough to be observed as X-ray binaries. Only a couple of candidates have been reported so far. Aims. Based on XMM-Newton observations, we report the positional coincidence of the brightest X-...
متن کاملA 33 hour period for the Wolf - Rayet / black hole X - ray binary candidate NGC 300 X - 1
Context. NGC 300 X-1 is the second extragalactic candidate, after IC 10 X-1, in the rare class of Wolf-Rayet/compact object X-ray binary systems exemplified in the Galaxy by Cyg X-3. From a theoretical point of view, accretion onto a black hole in a detached system is possible for large orbital periods only if the mass of the relativistic object is high or the velocity of the accreted wind is l...
متن کاملLuminous Optical Transient in the Nearby Galaxy Ngc 300 1
A luminous optical transient (OT) that appeared in NGC 300 in early 2008 had a maximum brightness, MV ≃ −13, intermediate between classical novae and supernovae. We present ground-based photometric and spectroscopic monitoring and adaptive-optics imaging of the OT, as well as preand post-outburst space-based imaging with HST and Spitzer. The optical spectrum at maximum showed an F-type supergia...
متن کاملA large Wolf - Rayet population in NGC 300 uncovered by VLT - FORS 2 ⋆
We have detected 58 Wolf-Rayet candidates in the central region of the nearby spiral galaxy NGC 300, based on deep VLT-FORS2 narrow-band imaging. Our survey is close to complete except for heavily reddened WR stars. Of the objects in our list, 16 stars were already spectroscopically confirmed as WR stars by Schild & Testor and Breysacher et al., to which 4 stars are added using low resolution F...
متن کاملX - ray emission from the Sculptor galaxy NGC 300
We report here the results of a full analysis of all the ROSAT PSPC spectral imaging observations and all the ROSAT HRI high resolution imaging observations of the very nearby (D = 2.1 Mpc) Sculptor galaxy, NGC 300. Many point sources are detected within the field, several of them showing evidence for variability, and we present full source lists detailing their X-ray properties, and attempt to...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2007
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361:20077677