Outburst, identification, and X-ray light curve of GS 1354 - 64 (= MX 1353 - 64?, Centaurus X-2?)
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چکیده
منابع مشابه
The 1997 hard state outburst of the X - ray transient GS 1354 − 64 / BW Cir
We present observations of the 1997 outburst of the X-ray transient GS 1354−64 (BW Cir) at X-ray, optical and, for the first time, radio wavelengths; this includes upper limits to the linear and circular polarisation of the radio data. The X-ray outburst was unusual in that the source remained in the low/hard X-ray state throughout; the X-ray peak was also preceded by at least one optical outbu...
متن کاملEVIDENCE OF A BLACK HOLE IN THE X-RAY TRANSIENT GS 1354 64 (pBW CIRCINI)
We present the first radial velocity curve of the companion star to BW Cir that demonstrates the presence of a black hole in this X-ray transient that recorded outbursts in 1987 and 1997 (and possibly 1971–1972). We identify weak absorption features corresponding to a G0–5 III donor star, strongly veiled by a residual accretion disk that contributes 61%–65% of the total light at 6300 . The Dopp...
متن کاملEvidence for a Black Hole in the X-ray Transient Gs 1354-64 (=bw Cir)
We present the first radial velocity curve of the companion star to BW Cir which demonstrates the presence of a black hole in this X-ray transient which recorded outbursts in 1987 and 1997 (and possibly 1971-2). We identify weak absorption features corresponding to a G0-5III donor star, strongly veiled by a residual accretion disc which contributes 61-65 % of the total light at λ6300. The Doppl...
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We present results from simultaneous optical (SALT) and X-ray (Swift and INTEGRAL) observations of GS 1354-64/BW Cir during the 2015 hard state outburst. During the rising phase, optical/X-ray time series show a strong anti-correlation with X-ray photons lagging optical. Optical and X-ray power spectra show quasi-periodic oscillations at a frequency of ∼ 18 mHz with a confidence level of at lea...
متن کاملInput ( 64 x 64 ) Motion Energy X Velocity Integration
Neurons in area MT of primate visual cortex encode the velocity of moving objects. We present a model of how MT cells aggregate responses from V1 to form such a velocity representation. Two diierent sets of units, with local receptive elds, receive inputs from motion energy lters. One set of units forms estimates of local motion, while the second set computes the utility of these estimates. Out...
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ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 1990
ISSN: 0004-637X,1538-4357
DOI: 10.1086/169222