Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...137..327o&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 137, no. 2, Aug. 1984, p. 327-334.
Astronomy and Astrophysics
Astrophysics
14
Astronomical Spectroscopy, Galactic Evolution, Interacting Galaxies, Interstellar Gas, Star Formation, Abundance, Astronomical Photometry, Emission Spectra, Galactic Nuclei, H Beta Line, H Ii Regions, Ionized Gases, Radial Velocity, Shock Heating, Ubv Spectra
Scientific paper
Direct photographic, photometric and spectroscopic observations of the interacting galaxy-pair IC2153 = ESO 364-IG 22 are reported. The observations were performed with the ESO 3.6-m, 1.5 m and 1-m telescopes at La Silla, Chile. The mean radial velocity of the system is 2630 km/s ( = or 30 km/s), corresponding to a distance of 35 Mpc. The system is aobut nine kpc across, and its UBV colors are consistent with those found in irregular galaxies. The absolute magnitude of the system is -18.4 mag. Spectral tracings of the main components show an early-type absorption spectrum and an emission spectrum. Spectra in the intermediate region of the pair have pure emission-line characteristics. Evidence of shock-heating in the galactic H-II regions, and it is estimated that about 7 percent of the light in H-beta originates from shock-heating and that the remainder arises from photoionization by hot stars. From a stellar population model, it is found that the UBV Johnson colors in the pair represent a burst of star formation with an age of 150 million years.
Bergvall Nils
Ekman A.
Olofsson Kjell
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