We present the multiple line observations carried out with interferometry. We observed the circumnuclear region of the barred galaxy NGC 7552 in molecular lines tracing diffuse molecular gas (12CO J 2 - 1; observed by SMA) and relatively dense molecular gas (HCN J 1 - 0; observed by ATCA). We also reprocessed a published HI image which covers the entire galaxy to gain an analytical image with higher resolution. The displacement between HCN (J 1 - 0) and radio knots (3 cm continuum; ATCA archive data) is clearly seen in the circumnuclear starburst ring of NGC 7552. The propagation time derived from 12CO J 2 - 1 and HI based rotation curve between the HCN (J 1 - 0) and radio knots implies the timescale between the formation and death of massive stars. The timescale of NGC 7552 is about an order of magnitude shorter than 5 - 10 Myr timescale for OB stars to become supernovae. It is possible that star formation in the ring is top heavy, resulting in a shorter timescale.
|Original language||English (US)|
|Journal||Journal of Physics: Conference Series|
|State||Published - 2012|
|Event||Astronomy at High Angular Resolution 2011: The Central Kiloparsec in Galactic Nuclei, AHAR 2011 - Bad Honnef, Germany|
Duration: Aug 29 2011 → Sep 2 2011
ASJC Scopus subject areas
- Physics and Astronomy(all)