Zeeman line splitting measurements sampling dense gas in dark cloud and star-forming cores

Details Zeeman line splitting measurements sampling dense gas in dark cloud and star-forming cores Zeeman line splitting measurements sampling dense gas in dark cloud and star-forming cores

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001a%26a...371..274u&link_type=abstract

Astronomy and Astrophysics, v.371, p.274-286 (2001)

Astronomy and Astrophysics

Astrophysics

9

Radio Lines: Ism, Magnetic Field, H Ii Regions, Ism: Molecules, Ism: Clouds

Scientific paper

We present measurements of Zeeman splitting in SO JN= 12-11 line emission/absorption arising from dense thermal gas (>106 cm-3) associated with ten compact H II and star-forming regions. No line-of-sight magnetic field, above an average 1sigma limit of 0.57 mG, is detected toward any of these sources. The W3(OH) region, found in a previous study to have a line-of-sight field of 3 mG in its dense gas, is thus unique in this respect. The implication of this study is that the magnetic fields in dense clouds are supercritical in the sense that they are not capable of supporting their host clouds against gravitational collapse. The relatively low average field limit is consistent with those theories predicting the quick onset of and short timescales for ambipolar diffusion. Also presented are (1) Zeeman splitting measurements of the CCS JN=10-01 line probing the 104-5 cm-3 gas towards three positions in the Taurus star forming region, giving a 1sigma average upper limit of 66 mu G, and (2) measurements of Zeeman splitting in the OH 2Pi3 /2;; J=7/2;;F= 3+ - 3- hyperfine line toward the compact H II regions DR-21 and G10.62.

Affiliated with

Also associated with

No associations

Rating

Zeeman line splitting measurements sampling dense gas in dark cloud and star-forming cores 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 Zeeman line splitting measurements sampling dense gas in dark cloud and star-forming cores, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Zeeman line splitting measurements sampling dense gas in dark cloud and star-forming cores will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1266491