Ground-based 1- to 32-microns observations of ARP 220: Evidence for a dust-embedded AGN?

Details Ground-based 1- to 32-microns observations of ARP 220: Evidence for a dust-embedded AGN? Ground-based 1- to 32-microns observations of ARP 220: Evidence for a dust-embedded AGN?

May 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987nascp2466..643b&link_type=abstract

Star formation in galaxies, Proceedings of a conference at the California Institute of Technology, Pasadena, California, June 16

Astronomy and Astrophysics

Astronomy

35

Active Galactic Nuclei, Cosmic Dust, Seyfert Galaxies, Space Observations (From Earth), Spectral Emission, Stellar Luminosity, Astronomical Photometry, Infrared Spectra, Interstellar Extinction, Radiation Absorption, Space Density, Spectral Energy Distribution, Star Formation

Scientific paper

New observations of the 10 and 20 micron size of the emission region in Arp 220 are presented. Also given are ground based photometry from 1 to 32 micron including measurements of the strength of the silicate feature at 10 micron. The results show that the 20 micron size of Arp is smaller than 1.5 arcsec (500 pc); comparison of IRAS and ground based observations show that IRAS 12 micron flux measured with a large arcmin beam is the same as that seen from the ground with a 3 arcsec aperture. At 10 micron a deep silicate absorption feature is seen that corresponds to a visual extinction of about 50 mag. These results suggest that a very significant portion of the 10 to the 12th power L0 infrared luminosity from Arp 220 comes from a region less than or of the order of 500 pc in diameter. When these results are combined with recent measurement of a broad Brackett alpha line by DePoy and an unresolved 2.2 micron source by Neugebauer, Matthews and Scoville, a very attractive possibility for the primary luminosity source Arp 220 is a dust embedded compact Seyfert type nucleus.

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