Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aas...207.2108t&link_type=abstract
American Astronomical Society Meeting 207, #21.08; Bulletin of the American Astronomical Society, Vol. 37, p.1192
Astronomy and Astrophysics
Astronomy
1
Scientific paper
We present 1''-resolution VLA K-band images of 14 nearby starburst galaxies in which we have detected compact (sub-arcsecond) and luminous mid-IR sources with LWS imaging spectrograph on Keck Observatory. Of the galaxies observed, 11 are detected with strong continuum emission at 1.3 cm. In the VLA K-band where synchrotron emission is weak and dust emission has not yet kicked in, therefore the radio continuum emission should be dominated by thermal free-free emission. The strong extended free-free emission indicates the existence of ˜ 104 - 105 O stars living in active regions of these starburst galaxies. Our K-band maps also reveal many compact sources which are presumbly ''radio-infrared supernebulae", or RISN. These nebulae are dense, young (< 1 Myr), and require the immediate presence of thousands of young O stars within regions only a few parsecs in extent. RISN in these galaxies are excited by massive (105 - 106 MSun) super star clusters (SSCs) which may be the precursors to globular clusters.
Beck Sara C.
Tsai Chao-Wei
Turner Jean L.
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