An ultrasoft X-ray source in Coma Berenices

Details An ultrasoft X-ray source in Coma Berenices An ultrasoft X-ray source in Coma Berenices

Jan 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...203l..25m&link_type=abstract

Astrophysical Journal, vol. 203, Jan. 1, 1976, pt. 2, p. L25-L28.

Computer Science

Sound

33

Hot Stars, White Dwarf Stars, X Ray Spectra, Astronomical Models, Galactic Clusters, Proportional Counters, X Ray Sources

Scientific paper

An intense soft X-ray source with an extraordinary spectrum has been observed in Coma Berenices, 4 deg northeast of and not associated with the Coma cluster of galaxies. Two spectra, obtained at different times in a sounding-rocket flight, indicate that the source temperature in thermal models is less than 1 million K; a power-law model requires photon power-law indices steeper than n = -3. The intensity in the 44-165 A band is of the order of 5 by 10 to the -10th power erg/sq cm/sec, but no flux is present at energies 0.3-2.1 keV to a limit of 1 by 10 to the -10th power erg/sq cm/sec. The lack of bright stars or a supernova remnant in the error box implies that this may be a new class of soft X-ray sources.

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