Submillimeter Imaging Polarimetry of the NGC 7538 Region

Details Submillimeter Imaging Polarimetry of the NGC 7538 Region Submillimeter Imaging Polarimetry of the NGC 7538 Region

2001-03-21

arxiv.org/abs/astro-ph/0103334v1

Astronomy and Astrophysics

Astrophysics

18 pages, 5 figures, accepted by ApJ, PS/PDF version with figures in full resolution is available at http://stars.sci.ibarak

Scientific paper

10.1086/321516

Imaging polarimetry of the 0.85mm continuum emission in the NGC 7538 region, obtained with the SCUBA Polarimeter, is presented. The polarization map is interpreted in terms of thermal radiation by magnetically aligned dust grains. Two prominent cores associated with IRS 1 and IRS 11, IRS 1(SMM) and IRS 11(SMM), are found in the surface brightness map. Although these cores look similar in surface brightness, their polarization shows striking differences. In IRS 11(SMM), the polarization vectors are extremely well ordered, and the degrees of polarization are quite high with an average of ~3.9 %. In IRS 1(SMM), on the other hand, the directions of polarization vectors are locally disturbed, and the degrees of polarization are much lower than those of IRS 11(SMM). These differences suggest that small scale fluctuations of the magnetic field are more prominent in IRS 1(SMM). This can be interpreted in terms of the difference in evolutionary stage of the cores. Inside IRS 1(SMM), which seems to be at a later evolutionary stage than IRS 11(SMM), substructures such as subclumps or a cluster of infrared sources have already formed. Small scale fluctuations in the magnetic field could have developed during the formation of these substructures. The distribution of magnetic field directions derived from our polarization map agrees well with those of molecular outflows associated with IRS 1(SMM) and IRS 11(SMM). Comparisons of energy densities between the magnetic field and the outflows show that the magnetic field probably plays an important role in guiding the directions of the outflows.

Affiliated with

Also associated with

No associations

Rating

Submillimeter Imaging Polarimetry of the NGC 7538 Region 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 Submillimeter Imaging Polarimetry of the NGC 7538 Region, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Submillimeter Imaging Polarimetry of the NGC 7538 Region will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-239581