Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...183...21m&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 183, no. 1, Sept. 1987, p. 21-28.
Astronomy and Astrophysics
Astrophysics
2
Astronomical Photometry, Barred Galaxies, Charge Coupled Devices, Forbidden Transitions, H Alpha Line, Peculiar Galaxies, Star Formation, Abundance, Astronomical Maps, Morphology, Star Formation Rate, Stellar Temperature
Scientific paper
The peculiar galaxy ESO 217-G09 has been investigated using the blue and red CCD frames together with echelle long-slit spectra in the H-alpha/N II forbidden line wavelength range. These have shown the galaxy to be a barred spiral type with similarities to the Large Magellanic Cloud. The galaxy has a solid-body rotation curve and together with an inclination of 45 deg this enables a mass of 1.9 x 10 to the 10th solar masses to be attributed to it. Estimates of the temperature of H II regions across the galaxies indicate that the increase in the H-alpha/N II forbidden line ratio moving out from the galaxy center is due to a decreasing abundance of nitrogen. The star formation rate for the galaxy is not particularly high and is probably not the cause of the large-scale O III forbidden line emission previously observed. It is suggested that the more probable cause of this emission is due to shocking from the galaxy's interaction with the IGM.
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