ASCA Observations of Two Ultraluminous IRAS Galaxies: IRAS 15307+3252 and IRAS 20460+1925

Details ASCA Observations of Two Ultraluminous IRAS Galaxies: IRAS 15307+3252 and IRAS 20460+1925 ASCA Observations of Two Ultraluminous IRAS Galaxies: IRAS 15307+3252 and IRAS 20460+1925

Apr 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997pasj...49..179o&link_type=abstract

Publications of the Astronomical Society of Japan, v.49, p.179-185.

Astronomy and Astrophysics

Astronomy

34

Galaxies: Individual (Iras 15307+3252, Iras 20460+1925), Galaxies: Seyfert, Galaxies: X-Rays, Quasars

Scientific paper

We report on ASCA observations of two ultraluminous far-infrared galaxies, IRAS 15307+3252 and IRAS 20460+1925. An X-ray flux of 1.53 times 10(-12) erg cm(-2) s(-1) in the 2--10 keV band was detected from IRAS 20460+1925. The continuous spectrum is well represented by a power law with a photon index of 1.99(+0.18}_{-0.15) and excess photoelectric absorption by a column of (2.6(+0.29}_{-0.32) )times 10(22) cm(-2) in the rest frame. The spectrum also shows an iron K emission line with an equivalent width of 260(+145}_{-137) eV and a centroid energy of 6.36+/- 0.08 keV in the rest frame. These spectral properties are consistent with those of Seyfert-2 galaxies, although the intrinsic 2--10 keV X-ray luminosity (corrected for absorption) of 1.20times 10(44) erg s(-1) is high and close to that of quasars. No X-rays were detected from IRAS 15307+3252, and the upper limit to the X-ray flux is 7.2 times 10(-14) erg cm(-2) s(-1) in the 2--10 keV band. However, the upper limit on the ratio of the X-ray flux to the far-infrared flux is not inconsistent with a source containing a highly obscured quasar.

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