Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005apj...634..436b&link_type=abstract
The Astrophysical Journal, Volume 634, Issue 1, pp. 436-441.
Astronomy and Astrophysics
Astronomy
11
Ism: Dust, Extinction, Ism: H Ii Regions, Ism: Individual (Keyhole Nebula), Radio Continuum: Ism, Stars: Individual: Constellation Name: Η Carinae
Scientific paper
We report observations made with the SIMBA bolometer at SEST to measure the 1.2 mm continuum emission toward the Keyhole nebula. We have detected 1.2 mm emission toward the ionized gas filaments of the Car II radio source that is attributed to thermal free-free emission. Several compact 1.2 mm emission sources have also been identified and found to correspond to bright-rimmed molecular globules. Under the assumption that for these sources the 1.2 mm emission corresponds to dust, we find mass estimates in the range 3-19 Msolar, which are consistent with previous molecular line measurements. The data also yield new 1.2 mm flux measurements at two different epochs during the cyclic brightness variation of η Carinae. No emission was detected toward the trademark dark keyhole of the nebula, consistent with it being cool molecular gas situated at the outskirts of the H II region.
Brooks Kate J.
Cox Pierre
Garay Guido
Nielbock Markus
Smith Nathan
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