Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...115...84m&link_type=abstract
Astronomy and Astrophysics, vol. 115, no. 1, Nov. 1982, p. 84-89.
Astronomy and Astrophysics
Astronomy
47
Astronomical Spectroscopy, Hydrogen Clouds, Infrared Radiation, Spiral Galaxies, Star Formation, Galactic Nuclei, Spectral Energy Distribution, Stellar Models, Ubv Spectra, X Ray Astronomy
Scientific paper
In contrast to other galaxies whose infrared output can be attributed to star formation (notably M 82), neither the radio nor X-ray emission from NGC 5253 appears to include any appreciable contribution from supernova remnants. What is more, there is no observable enhancement of the 2-micron emission that could be attributed to red giants/supergiants. It is therefore argued that the currently observable star formation event in the central region of the galaxy is probably the first to have occurred within the last (approximately) 10 to the 8th yr. This conclusion is seen as especially significant in view of the suggestion by Van den Bergh (1980) that star clusters observed in the outer parts of NGC 5253 result from star formation triggered some 10 to the 8th-10 to the 9th yr ago after an encounter with M 83. It is also thought possible that star formation triggered at this time in the outer parts of the galaxy may only recently have propagated to the center.
Glass S000. I.
Moorwood Alan F. M.
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