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Paper: Sensitive VLBI Observations of the ULIRG IRAS 17208-0014
Volume: 340, Future Directions in High Resolution Astronomy: The 10th Anniversary of the VLBA
Page: 232
Authors: Momjian, E.; Troland, T.H.; Romney, J.D.; Carilli, C.L.; Taylor, G.B.
Abstract: 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—C0014 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 Msolar yr−1, and a supernova rate of ∼ 4 yr−1. The H I absorption line associated with this galaxy is very wide (ΔV20% = 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. Assuming Keplerian motion, the enclosed dynamical mass is about 2.3 × 109(sin−2i) Msolar, comparable to the mass estimated from CO observations.
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