Radio Constraints on the Starburst Ages of Two Wolf-Rayet Galaxies

Details Radio Constraints on the Starburst Ages of Two Wolf-Rayet Galaxies Radio Constraints on the Starburst Ages of Two Wolf-Rayet Galaxies

Nov 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003apj...597..274y&link_type=abstract

The Astrophysical Journal, Volume 597, Issue 1, pp. 274-278.

Astronomy and Astrophysics

Astronomy

4

Galaxies: Individual: Alphanumeric: F08208+2816, Galaxies: Individual: Name: Markarian 1039, Galaxies: Starburst, Stars: Wolf-Rayet

Scientific paper

Mrk 1039 and IRAS F08208+2816 are two new Wolf-Rayet galaxies whose optical spectroscopic observations suggest that star formation in these galaxies occurs in brief bursts for starburst ages of only ~4×106 yr. Other observational diagnostics are needed to measure the contributions of older and less massive stars to the total luminosity of Wolf-Rayet galaxies. Both far-infrared (FIR) and radio continuum emission provide such diagnostics for stars with masses as low as 5Msolar and lifetimes of several times 107 yr. We observed these two Wolf-Rayet galaxies at 20, 6, and 2 cm wavelengths using the B, C, and D configurations of the VLA, respectively. Mrk 1039 contains a fairly small (dr<500 pc), primarily thermal radio source whose FIR/radio flux ratio is consistent with the isolated H II region expected if the starburst in Mrk 1039 is really very young (τ~4×106 yr). In contrast, F08208+2816 has a nonthermal radio spectrum and obeys the FIR/radio correlation. These two radio properties indicate that the young Wolf-Rayet starburst in F08208+2816 is embedded in a large and luminous galaxy that has hosted comparably luminous starburst activity extending >~3×107 yr in the past.

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