Mid-infrared imaging of Markarian 231 and ARP 220

Details Mid-infrared imaging of Markarian 231 and ARP 220 Mid-infrared imaging of Markarian 231 and ARP 220

Mar 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...387l..17k&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 387, March 1, 1992, p. L17-L19.

Astronomy and Astrophysics

Astrophysics

14

Galactic Nuclei, Infrared Imagery, Markarian Galaxies, Quasars, Seyfert Galaxies, Absorption Spectra, Angular Resolution, Far Infrared Radiation, Interstellar Gas, Radio Emission

Scientific paper

High angular resolution observations of Arp 220 and Mrk 231 provide images of the nuclei and show that the source of the strong mid-IR emission is confined to regions less than about 0.5 arcsec or 400 pc in diameter in Mrk 231 and less than 1.5 arcsec x 0.9 arcsec or 320 x 530 pc in Arp 220. If much of the far-IR emission also derives from such a small region, the implied radiation densities are quite high, equivalent to one O star per cu pc. Although in normal galaxies the near-IR traces an older population of evolved, cool stars, such high radiation densities in the IR bright galaxies suggest the possibility that the spatial correlation observed between the near-IR, mid-IR, and radio may hold because emission in all three bands is associated with hot interstellar gas and dust.

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