SIMBAD references

2007A&A...468L..57D - Astronomy and Astrophysics, volume 468, L57-61 (2007/6-4)

Black hole in the West nucleus of Arp 220.


Abstract (from CDS):

We present new observations with the IRAM Interferometer, in its longest-baseline configuration, of the CO(2-1) line and the 1.3mm dust radiation from the Arp 220 nuclear region. The dust source in the West nucleus has a size of 0.19''x0.13'' and a 1.3mm brightness temperature of 90K. This implies that the dust ring in the West nucleus has a high opacity, with τ=1 at 1.1mm. Not only is the dust ring itself optically thick in the submm and far-IR, but it is surrounded by the previously-known, rapidly rotating molecular disk of size 0.5'' that is also optically thick in the mid-IR. The molecular ring is cooler than the hot dust disk because the CO(2-1) line is seen in absorption against the dust disk. The dust ring is massive (109M), compact (radius 35pc), and hot (true dust temperature 170K). It resembles rather strikingly the dust ring detected around the quasar APM 08279+52, and is most unlike the warm, extended dust sources in starburst galaxies. Because there is a strong temperature gradient from the hot dust ring to the cooler molecular disk, the heating must come from a concentrated source, an AGN accretion disk that is completely invisible at optical wavelengths, and heavily obscured in hard X-rays.

Abstract Copyright:

Journal keyword(s): galaxies: nuclei - galaxies: kinematics and dynamics - galaxies: ISM - galaxies: individual: Arp 220

Simbad objects: 15

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