Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...241..389j&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 241, no. 2, Jan. 1991, p. 389-398.
Astronomy and Astrophysics
Astrophysics
9
Astronomical Spectroscopy, Elliptical Galaxies, Galactic Evolution, Luminosity, Absorption Spectra, Astronomical Photometry, Emission Spectra, Interstellar Matter, Ubv Spectra
Scientific paper
This paper presents a spectroscopic and photometric analysis of ESO 286-IG19, a galaxy merger in an intermediate stage of the process. The central part of the galaxy has UBV colors characteristic of a young (a few times 10 to the 7th yr) stellar population, whereas in the infrared the colors are more like those of an old population. The spectrum of the central part of ESO 286-IG19 exhibits, in addition to the stellar continuum, an emission-line spectrum caused by photoionization from hot stars and by shock heating. The flux in H-alpha is consistent with what is expected due to the Lyman-flux from the young stars, and the extent of the ionized gas is limited to the area around the central part of the galaxy. ESO 286-IG19 is also an exceptionally luminous source of infrared radiation, originating in warm dust heated by the young stars.
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