Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aj....143...98w&link_type=abstract
The Astronomical Journal, Volume 143, Issue 4, article id. 98 (2012).
Astronomy and Astrophysics
Astronomy
Galaxies: Individual: Ngc 4194, Galaxies: Starburst, Galaxies: Star Formation
Scientific paper
We report the results of long-slit spectroscopy at position angles 68°, 131°, and 164° for the minor-merger NGC 4194, a luminous infrared starburst galaxy. The mass within 1.2 kpc of the dynamical center is estimated to be 4.8 × 109 to 1.7 × 1010 M &sun;, depending on the assumed inclination to the plane of the sky. The star formation rate (SFR) in the areas sampled is 8 M &sun; yr-1. The metallicity, log(O/H) + 12, ranges from ~8.8 to >9.0 in regions of significant star formation, suggesting that the metallicity has been enhanced by the current star formation. The star-forming regions range in age from 5 to 9 Myr, with the youngest ages occurring in the regions of high SFR. Electron temperatures and the location of the spectra in emission line diagnostic diagrams suggest the presence of shock waves, presumably due to the presence of supernovae, winds from massive stars, and/or collisions of clouds due to the merger. The presence of massive stars and supernovae is consistent with the ages determined for the star-forming regions. The ages of the continua produced by the stellar population are estimated to range from 10 Myr to 5 Gyr. Much of the stellar population represented in the continua was probably formed before the merger and represents the progenitor galaxies.
Angione Ron
Bachilla R.
Hancock Mark
Kaiser Mary Elizabeth
Nelson Charles H.
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