Detection of an extremely soft X-ray outburst in the HII-like nucleus of NGC 5905.

Details Detection of an extremely soft X-ray outburst in the HII-like nucleus of NGC 5905. Detection of an extremely soft X-ray outburst in the HII-like nucleus of NGC 5905.

May 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...309l..35b&link_type=abstract

Astronomy and Astrophysics, v.309, p.L35-L38

Astronomy and Astrophysics

Astrophysics

55

Galaxies: General, Galaxies: Starburst, Galaxies: Individual: Ngc5905, Quasars: General, X-Rays: Galaxies

Scientific paper

NGC 5905 was observed with ROSAT five times, three times during the ROSAT all-sky survey (RASS) and twice in the pointed observing mode. The soft X-ray properties of the nucleus of NGC 5905 derived from the RASS observations, namely high-amplitude flux variability on timescales of days, the extremely soft spectrum (photon index {GAMMA}=4), and high peak luminosity of L_X_=7x10^42^ergs/s, are all inconsistent with its optical classification as HII-type, i.e. starburst galaxy. During the pointed observations taken two years later, the X-ray luminosity was down by a factor of >80. Possible mechanisms, which can produce the high state, are discussed. Tidal disruption of a star near a central black hole is in good agreement with the observations.

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