Misalignment of the microquasar V4641 Sgr (SAX J1819.3−2525)
نویسندگان
چکیده
منابع مشابه
GMRT Observations of Microquasar V4641 Sgr
We report the GMRT observations of V4641 Sgr during the May 2002 outburst at radio frequencies of 610 and 244 MHz. This is the lowest frequency radio detection of this source. The present low frequency radio observations clearly showed spectral evolution from the optically thick to thin state. This behavior is broadly consistent with the expanding bubble model. However, the flux densities obser...
متن کاملLow Frequency GMRT Observations of Microquasar V4641 Sgr
We have observed the micro-quasar V4641 Sgr (SAX J1819.3-2525) at the time of flare during May 2002, using the Giant Metrewave Radio Telescope at low radio frequencies (244 and 610 MHz). This is the lowest frequency radio detection of the source. The source showed clear signature of spectral evolution from optically thick to thin state. We model the spectral evolution of the source to obtain so...
متن کاملA Black Hole in the Superluminal Source Sax J1819.3-2525 (v4641 Sgr)1
Spectroscopic observations of the fast X-ray transient and superluminal jet source SAX J1819.3-2525 (V4641 Sgr) reveal a best fitting period of Pspect = 2:81678 0:00056 days and a semiamplitude of K2 = 211:0 3:1 km s−1. The optical mass function is f (M) = 2:74 0:12 M . We find a photometric period of Pphoto = 2:81730 0:00001 days using a light curve measured from photographic plates. The folde...
متن کاملSuper-Eddington outburst of V4641 Sgr
X–ray transients provide unique opportunity to probe accretion regimes of at a vastly different accretion rates. We analyze a collection of the RXTE observations (Galactic Center scans, ASM monitoring and a pointed observation) of enigmatic transient source high mass X-ray binary V4641 Sgr and argue that they broadly support the hypothesis that giant September 1999 outburst was associated with ...
متن کاملV4641 Sgr: a candidate precessing microblazar
The X-ray spectrum of the Galactic X-ray binary V4641 Sgr in outburst has been found to exhibit a remarkably broad emission feature above 4 keV, with inferred equivalent widths up to 2 keV. Such a feature was first detected during the X-ray flaring activity associated with the giant outburst that the source experienced in 1999 September. The extraordinarily large equivalent width line was then ...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society: Letters
سال: 2008
ISSN: 1745-3925,1745-3933
DOI: 10.1111/j.1745-3933.2008.00545.x