Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000mnras.312..380s&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 312, Issue 2, pp. 380-386.
Astronomy and Astrophysics
Astronomy
1
Galaxies: Active, Galaxies: Individual: Rxj 2153.3-1514, Galaxies: Nuclei, X-Rays: Galaxies
Scientific paper
We present results on the identification of the optical counterpart of an ultrasoft X-ray source discovered with ROSAT. Two optical candidates - a galaxy and a star - are found within the error circle of the X-ray source position. Optical spectroscopy of the two candidates reveals that (a) the galaxy is a narrow-line Seyfert type 1 galaxy, and (b) the star is a late A-type or an early F-type. The FxFv ratio is too high for the star to be the counterpart of the X-ray source, but consistent with that for an active galaxy. Although higher-resolution X-ray imaging of the region is needed to definitely settle the question of the counterpart of the X-ray source, the narrow-line Seyfert 1 galaxy is the best candidate. The spectral properties of the newly discovered narrow-line Seyfert 1 galaxy are also presented, including its extreme X-ray power-law spectral index of Γ>=4.
Jones Laurence R.
Singh Kulinder Pal
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