ASCA spectroscopy of IRAS 23060+0505: penetrating the torus of a type 2 quasar with X-rays

Details ASCA spectroscopy of IRAS 23060+0505: penetrating the torus of a type 2 quasar with X-rays ASCA spectroscopy of IRAS 23060+0505: penetrating the torus of a type 2 quasar with X-rays

Oct 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997mnras.290..617b&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 290, Issue 4, pp. 617-622.

Astronomy and Astrophysics

Astronomy

46

Galaxies: Individual: Iras 23060+0505, Galaxies: Seyfert, X-Rays: Galaxies

Scientific paper

We report on a pointed ASCA observation of the powerful (L_bol~1.3x10^46 erg s^-1) type 2 infrared luminous galaxy IRAS 23060+0505. This galaxy has been the subject of detailed spectroscopic and spectropolarimetric studies which have revealed a hidden broad-line region and have been used to construct a detailed model of the light paths in this source. Our observation detects IRAS 23060+0505 in the X-ray band for the first time and complements the optical and infrared studies. We detect hard X-ray emission that can be modelled as a power law with a 2-10 keV luminosity of 1.5x10^44 erg s^-1, thereby verifying the existence of an accreting supermassive black hole in IRAS 23060+0505. The obscuring torus of IRAS 23060+0505 appears to be Compton thin along our line of sight, and we measure a column to the nuclear X-ray source of about 8x10^22 cm^-2. Comparison of the X-ray column with the A_V=30+/-4 mag extinction measurement by Young et al. suggests that the torus may have a dust-to-gas ratio rather similar to that in the interstellar medium of the Milky Way. We also find some evidence for iron K-line emission. The apparent X-ray to bolometric luminosity ratio for IRAS 23060+0505 is <~1 per cent, a rather low value, and we consider possible explanations for this low ratio.

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