Rotational broadening and Doppler tomography of the quiescent X-ray nova Centaurus X-4
نویسندگان
چکیده
منابع مشابه
Doppler tomography of the transient X - ray binary Centaurus X - 4 in quiescence ⋆
We present ESO-NTT low resolution spectroscopy of the neutron star X-ray transient Cen X-4 in quiescence over a complete orbital cycle. Our data reveal the presence of a K3-7 V companion which contributes 63% to the 5600–6900 Å flux and orbits the neutron star with a velocity semi-amplitude of K 2 = 145.8 ± 1.0 km s −1. This, combined with a previous determination of the inclination angle and m...
متن کاملHst/stis Uv Spectroscopy of Two Quiescent X-ray Novae: A0620-00 and Centaurus X-4
In 1998 we made UV spectroscopic observations with HST/STIS of A0620-00 and Cen X-4, which are two X-ray novae (aka soft X-ray transients). These binary systems are similar in all respects except that the former contains a black hole and the latter contains a neutron star. A UV spectrum (1700-3100Å) is presented for the quiescent state of each system in the context of previously published UV/op...
متن کاملThe Quiescent Emission Spectrum of Cen X-4 and Other X-ray Transients Containing Neutron Stars
We use the observed optical-UV and X-ray emission spectrum of Cen X-4 during quiescence to constrain models for the accretion flow in this system. We argue that the optical-UV emission is not due to an optically-thick quiescent accretion disk, nor due to synchrotron emission from an Advection-Dominated Accretion Flow (ADAF). Emission from the bright spot could account for the observed optical-U...
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We present high angular resolution X-ray images and spectra from two Chan-dra ACIS-I observations of the X-ray jet in the nearby radio galaxy Centaurus A. We find that the X-ray emission from the jet is composed of a low surface brightness diffuse component extending continuously from within at least 60 pc of the active nucleus into the NE radio lobe 4 kpc from the nucleus, along with 31 discre...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2002
ISSN: 0035-8711,1365-2966
DOI: 10.1046/j.1365-8711.2002.05521.x