A ROSAT Observation of the Black-Hole Candidate GRO:J0422+32

Details A ROSAT Observation of the Black-Hole Candidate GRO:J0422+32 A ROSAT Observation of the Black-Hole Candidate GRO:J0422+32

Jun 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...273l..11p&link_type=abstract

Astronomy and Astrophysics, Vol.273, NO. 1/JUNI, P. L11, 1993

Physics

20

X-Rays: Stars, Accretion, Accretion Disks, Black Hole Physics

Scientific paper

We report on a ROSAT HRI observation of the hard transient GRO J0422+32 about 42 days after the start of the outburst. The X-ray position (error radius 6 arcsec) agrees well with the positions of the proposed optical and radio counterparts. In the ROSAT energy band (0.1-2.4 keV) the source showed strong flaring activity; a power spectrum analysis of the photon arrival times yields a spectrum with a decrease at frequencies above 0.1 Hz that can be described by a power law with a slope of -1.5. Below 0.1 Hz the spectrum flattens; QPO peaks reported in hard X-rays are confirmed. The integrated rms variability is very high (˜4O%). The measured 0.1-2.4 keV X-ray flux of 0.3 Crab does not require an additional soft X-ray component in GRO J0422+32, if the source followed the decay trend reported in hard X-rays. The flaring activity and X-ray spectrum of GRO J0422+32 are similar to other black hole candidates in their "hard" spectral state.

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