Mid-infrared imaging of Markarian 231 and Arp 220

Journal Article · Sun Mar 01 00:00:00 EST 1992 · Astrophysical Journal; (United States)

DOI:https://doi.org/10.1086/186295· OSTI ID:5597406

Keto, E; Ball, R; Arens, J; Jernigan, G; Meixner, M ^[1]

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1. NASA, Infrared Telescope Facility, Mauna Kea, HI (United States) Smithsonian Astrophysical Observatory, Cambridge, MA (United States) Lawrence Livermore National Laboratory, Livermore, CA (United States) Lawrence Livermore National Laboratory, Livermore, CA (United States) California University, Berkeley (United States)

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. 23 refs.

• OSTI ID: 5597406
• Journal Information: Astrophysical Journal; (United States), Vol. 387; Other Information: L17-L19; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
GALAXIES
INFRARED RADIATION
MARKARIAN GALAXIES
ABSORPTION SPECTRA
CORRELATIONS
FAR INFRARED RADIATION
GALAXY NUCLEI
IMAGES
INTERSTELLAR SPACE
QUASARS
RADIOWAVE RADIATION
RESOLUTION
SEYFERT GALAXIES
COSMIC RADIO SOURCES
ELECTROMAGNETIC RADIATION
RADIATIONS
SPACE
SPECTRA
661300* - Other Aspects of Physical Science- (1992-)