Evidence of Ionized Winds in W49N on 0.0025 pc Scales

Details Evidence of Ionized Winds in W49N on 0.0025 pc Scales Evidence of Ionized Winds in W49N on 0.0025 pc Scales

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...195.5314d&link_type=abstract

American Astronomical Society, 195th AAS Meeting, #53.14; Bulletin of the American Astronomical Society, Vol. 31, p.1456

Astronomy and Astrophysics

Astronomy

Scientific paper

We have observed the ionized gas in W49N with the Very Large Array (VLA) at 13 mm and 7 mm, and with the Berkeley Illinois Maryland Association (BIMA) Array at 3.3 mm. These observations vary in resolution from 0.35\arcsec to 0.045\arcsec (0.019 to 0.0025 pc at a distance of 11.4 kpc). In addition, we have used the VLA to observe water maser emission towards the bright G sources over a wide velocity range from -256 to 271 km s-1. The high resolution continuum observations reveal the morphologies in the ultracompact sources; most of the sources at 0.045\arcsec resolution appear to have shell or ring morphologies. Of the seven bright sources in W49N for which multifrequency flux densities have been measured, four are observed to have rising spectral indices, with values ranging from α =0.3 to 1.1 and three are observed to be flat (Sν ν α ). Those sources with rising spectral indices (A, B1, B2, G1 and G2) also have the broadest radio recombination lines, with Δ VFWHM>45 km s-1 in the H66α line (De Pree et al. 1996). The water maser postions have been aligned with the high resolution 7 mm continuum to within 0.05\arcsec, and appear to be closely associated with the G1/G2 sources. The outflow discussed in Gwinn et al. (1992) and Mac Low & Elitzur (1992) is centered within 0.2\arcsec of the bright G2 continuum peak, but is not clearly associated with any one of the 7 mm continuum sources. We present the high resolution images and an interpretation of the distribution of ionized gas and water maser positions. CGD acknowledges the support of a AAS Small Research Grant.

Affiliated with

Also associated with

No associations

Rating

Evidence of Ionized Winds in W49N on 0.0025 pc Scales 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 Evidence of Ionized Winds in W49N on 0.0025 pc Scales, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Evidence of Ionized Winds in W49N on 0.0025 pc Scales will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1740948