In Search of Circumstellar Disks Around Young Massive Stars

Details In Search of Circumstellar Disks Around Young Massive Stars In Search of Circumstellar Disks Around Young Massive Stars

2005-10-27

arxiv.org/abs/astro-ph/0510761v1

Astronomy and Astrophysics

Astrophysics

Accepted by the Astronomical Journal, 42 pages

Scientific paper

10.1086/499156

We present 7 mm, 1.3 cm and 3.6 cm continuum observations made with the Very Large Array toward a sample of ten luminous IRAS sources that are believed to be regions of massive star formation. We detect compact 7 mm emission in four of these objects: IRAS 18089-1732(1), IRAS 18182-1433, IRAS 18264-1152 and IRAS 18308-0841 and for the first time find that these IRAS sources are associated with double or triple radio sources separated by a few arcseconds. We discuss the characteristics of these sources based mostly on their spectral indices and find that their nature is diverse. Some features indicate that the 7 mm emission is dominated by dust from disks or envelopes. Toward other components the 7 mm emission appears to be dominated by free-free radiation, both from ionized outflows or from optically thick H II regions. Furthermore, there is evidence of synchrotron contamination in some of these sources. Finally, we found that the sources associated with ionized outflows, or thermal jets are correlated with CH$_3$OH masers. The precise determination of the nature of these objects requires additional multifrequency observations at high angular resolution. The 3.6 cm continuum observations also revealed seven UCHII regions in the vicinity of the sources IRAS 18089-1732(1) and two more in the source IRAS 18182-1433. We show that the small photoionized nebulae of these UCHII regions are produced by early B-type stars.

Affiliated with

Also associated with

No associations

Rating

In Search of Circumstellar Disks Around Young Massive Stars 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 In Search of Circumstellar Disks Around Young Massive Stars, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and In Search of Circumstellar Disks Around Young Massive Stars will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-322130