VLBA Observations of 12 GHZ Methanol Masers toward W3(OH)

Details VLBA Observations of 12 GHZ Methanol Masers toward W3(OH) VLBA Observations of 12 GHZ Methanol Masers toward W3(OH)

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999apj...519..244m&link_type=abstract

The Astrophysical Journal, Volume 519, Issue 1, pp. 244-256.

Astronomy and Astrophysics

Astronomy

24

Ism: H Ii Regions, Ism: Individual: Alphanumeric: W3, Ism: Molecules, Masers, Radio Lines: Ism, Stars: Formation

Scientific paper

We have conducted VLBA observations of the 12 GHz CH_3OH masers toward the ultracompact H II region W3(OH). The angular resolution of ~1 mas is sufficient to resolve most of the maser spots and determine their sizes and brightness temperatures. The FWHM sizes of the spots are found from <=2 to 10 AU with brightness temperatures between 10^9 and 6x10^11 K. The actual brightness temperatures may be higher (by a factor <=10) than the measured values, because most of the spots have spectral profiles unresolved with our velocity resolution (0.28 km s^-1). Our data also suggest the presence ofa spatially extended component of maser emission with size >=20 mas and brightness temperature<=10^9 K. The comparison of our data with previous 6.7 GHz VLBI observations shows that there is a good spatial (<=10 mas) and velocity (within 0.3 km s^-1) correspondence between numerous 12 and 6.7 GHz CH_3OH spots. Comparing our maps with those of Menten et al. yields relative proper motions of a few km s^-1 in magnitude. A ``linear structure'' of approximately 200 AU in size (P.A.=141^deg) is found in the northern methanol maser clump, which also shows a regular trend of radial velocities with projected positions (a velocity gradient of 2400 km s^-1 pc^-1).

Affiliated with

Also associated with

No associations

Rating

VLBA Observations of 12 GHZ Methanol Masers toward W3(OH) 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 VLBA Observations of 12 GHZ Methanol Masers toward W3(OH), we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and VLBA Observations of 12 GHZ Methanol Masers toward W3(OH) will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1619345