Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...429..233k&link_type=abstract
The Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 429, no. 1, p. 233-240
Astronomy and Astrophysics
Astronomy
7
Molecular Clouds, Nebulae, Protostars, Star Formation, Carbon Monoxide, Collision Parameters, Extragalactic Radio Sources, Infrared Astronomy Satellite
Scientific paper
We have carried out radio, near-infrared, and optical observations of the IRAS point source IRAS 19550+3248. (12)CO J = 1-0 line observations revealed a high-velocity (HV) molecular outflow centered on IRAS 19550+ 3248. The HV gas has a bipolar pattern with the blue and red peaks separated by 1 arcmin along the north-south direction. The mechanical luminosity of the HV molecular outflow is approximately 9 x 1031d2 ergs/s, and its dynamical age is approximately 5 x 104d2 yr, where d2 is the distance to the source normalized to 2 kpc. Inside the 95% confidence ellipse of IRAS position, we have detected a nebulous K band source. The nebulosity extends to 0.1d2 pc in the east-west direction. In R and I bands, the source appears to be composed of two extended weak peaks shifted toward the blueshifted CO lobe from the peak position K band. These near-infrared emission features are likely scattered stellar light. The infrared source has a steep spectral index between 2 and 25 microns (d log nuFnu/d log nu = -0.93), which indicates that it is a protostar deeply embedded in a dense molecular cloud core. The bolometric luminosity based on R, I, H, and K band photometry together with the IRAS data is 150d2 exp 2 Solar Luminosities. IRAS 19550+3248 islocated at the center of a small (4 arcmin x 7 arcmin) dense molecular clump. The clump is at the tip of a long (approximately 1 deg) filmentary molecular cloud. The molecular cloud is composed of clumps which are not confined by gravity and nor, probably, by external pressure. The characteristic timescale for dispersal is approximately 6 x 106 yr. We suggest cloud-cloud collision as a possible mechanism for the disruption of the cloud and for the formation of IRAS 19550+3248.
Fuller Gary A.
Jung Jae-Hoon
Koo Bon-Chul
Kwon Suk Minn
Lee Myung Gyoon
No associations
LandOfFree
A multiwavelength study of IRAS 19550+3248: A protostar possibly formed by a cloud-cloud collision does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with A multiwavelength study of IRAS 19550+3248: A protostar possibly formed by a cloud-cloud collision, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A multiwavelength study of IRAS 19550+3248: A protostar possibly formed by a cloud-cloud collision will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1252868