Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...430l..33s&link_type=abstract
The Astrophysical Journal, Part 2 - Letters, vol. 430, no. 1, p. L33-L36
Astronomy and Astrophysics
Astronomy
49
Active Galactic Nuclei, Infrared Sources (Astronomy), Near Infrared Radiation, Radio Sources (Astronomy), Barred Galaxies, H Ii Regions, Infrared Imagery, Molecular Clouds
Scientific paper
The nucleus of starburst galaxy NGC 253 has been located with high resolution J-, H-, K-band imaging. It lies shrouded in a dense dust cloud with A nu approximately greater than 24 and molecular mass very approximately equal to 6 x 10 4 solar mass located very approximately equal to 2."2 northwest of the intensity peak in the J, H, and K maps. The nucleus is identified with the brightest 6 cm radio point source. The intensity peak itself has substantial emission from hot gas of at least 500 K. The other hot spots are merely holes in the dust, rather than intrinsically luminous areas. A dense structure of molecular gas of mass 5 x 10 4 solar mass extends very approximatley equal to 70 pc along the major axis. This structure shows evidence of curvature consistent with spiral arms. The molecular material/dust in the bar traces the 6 cm radio continuum emission. Dense knots of molecular gas are correlated with 6 cm radio peaks, suggesting that the fainter radio sources are H II regions rather than supernovae or supernova remnants.
Eckart Andreas
Genzel Reinhard
Hofmann Ralf
Sams Bruce J. III
Tacconi-Garman Lowell
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