Sensitive VLBI Observations of the ULIRG IRAS 17208-0014

Details Sensitive VLBI Observations of the ULIRG IRAS 17208-0014 Sensitive VLBI Observations of the ULIRG IRAS 17208-0014

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aspc..340..232m&link_type=abstract

Future Directions in High Resolution Astronomy: The 10th Anniversary of the VLBA, ASP Conference Proceedings, Vol. 340. Edited

Astronomy and Astrophysics

Astronomy

Scientific paper

We present sensitive VLBI (VLBA + Phased VLA) results on the radio continuum of, and the 21 cm H I absorption toward, the ULIRG IRAS 17208-0014 at 1382 MHz. The high-resolution continuum images reveal a nuclear starburst region in this galaxy. This nuclear region is composed of diffuse emission that extends over 670 × 340 pc on the plane of the sky, and a number of compact sources. The compact sources are likely to be clustered supernova remnants and/or luminous radio supernovae. We derive a massive star formation rate of ˜ 84 M&sun; yr-1, and a supernova rate of ˜ 4 yr-1. The H I absorption line associated with this galaxy is very wide (Δ V20%=696 km s-1). It is composed of multiple components with optical depths between 0.3 and 2.5. The H I absorption shows a strong velocity gradient of 453 km s-1 across 0.36 arcsec. Assuming Keplerian motion, the enclosed dynamical mass is about 2.3 × 109 (sin-2 i) M&sun;, comparable to the mass estimated from CO observations.

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