منابع مشابه
UvA - DARE ( Digital Academic Repository ) Pulse delay observations of GRO J 1744 - 28
The bursting pulsar GRO J1744228 exhibits a unique combination of persistent X-ray pulsations (with a pulse period s) and X-ray bursts. The pulsations are also present (at an enhanced amplitude) during the P ≈ 0.467 pulse bursts, but the arrival times of the pulses during the burst are delayed with respect to those of the persistent emission. We present the results of a detailed study of the pu...
متن کاملComptel Observations of Gro J1655-40
GRO J1655-40 is a transient black-hole candidate that has been shown to eject matter at apparently superluminal velocities. OSSE spectra measured during X-ray outbursts are consistent with a single power law up to 600 keV, with no evidence for a high-energy cutoo. Flaring behaviour of GRO J1655-40 has also been claimed to be detected up to 10 MeV during observations with the balloon-borne HIREG...
متن کاملSigma Observations of the Bursting Pulsar Gro J 1744 - 28
We present the results of the GRANAT/SIGMA hard X-/soft γ-ray long-term monitoring of the Galactic Center (GC) region concerning the source GRO J1744-28, discovered on 1995 Dec. 2 by CGRO/BATSE. SIGMA observed the region containing the source in 14 opportunities between 1990 and 1997. In two of these observing sessions, corresponding to March 1996 and March 1997, GRO J1744-28 was detected with ...
متن کاملKeck Infrared Observations of GRO J0422+32 in Quiescence
We present Keck K-band photometry and low-resolution H&K-band spectroscopy of the X-ray nova GRO J0422+32 obtained while the system was in the quiescent state. No clear ellipsoidal modulation is present in the light curve, which is instead dominated by a strong flickering component. In the K-band we observe strong Brγ emission, with an equivalent width of 38 ± 5 Å. From this we conclude that th...
متن کاملKeck Observations of the Black-hole Candidate Gro J0422+32
Keck observations of the black-hole candidate GRO J0422+32 in quiescence have been used by Filippenko, Matheson, & Ho (1995) to determine a mass function f(Mx) = 1.21 ± 0.06 M for the compact object. Reanalysis of the data shows that the mass ratio, q = Mc/Mx, is q = 0.116 −0.071 from the rotational broadening of the companion star υ sin i = 90 −27 km s −1 (1σ). From q and the mass function (sl...
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ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 1998
ISSN: 0004-637X
DOI: 10.1086/311254