Discovery of extended radio emission in the young cluster Wd1

Details Discovery of extended radio emission in the young cluster Wd1 Discovery of extended radio emission in the young cluster Wd1

1998-07-29

arxiv.org/abs/astro-ph/9807303v1

Astronomy and Astrophysics

Astrophysics

5 pages including encapsulated figures, figure 3 separate. Accepted for MNRAS pink pages

Scientific paper

10.1046/j.1365-8711.1998.02038.x

We present 10 micron, ISO-SWS and Australia Telescope Compact Array observations of the region in the cluster Wd1 in Ara centred on the B[e] star Ara C. An ISO-SWS spectrum reveals emission from highly ionised species in the vicinity of the star, suggesting a secondary source of excitation in the region. We find strong radio emission at both 3.5cm and 6.3cm, with a total spatial extent of over 20 arcsec. The emission is found to be concentrated in two discrete structures, separated by 14''. The westerly source is resolved, with a spectral index indicative of thermal emission. The easterly source is clearly extended and nonthermal (synchrotron) in nature. Positionally, the B[e] star is found to coincide with the more compact radio source, while the southerly lobe of the extended source is coincident with Ara A, an M2 I star. Observation of the region at 10micron reveals strong emission with an almost identical spatial distribution to the radio emission. Ara C is found to have an extreme radio luminosity in comparison to prior radio observations of hot stars such as O and B supergiants and Wolf-Rayet stars, given the estimated distance to the cluster. An origin in a detatched shell of material around the central star is therefore suggested; however given the spatial extent of the emission, such a shell must be relatively young (10^3 yrs). The extended non thermal emission associated with the M star Ara A is unexpected; to the best of our knowledge this is a unique phenomenon. SAX (2-10keV) observations show no evidence of X-ray emission, which might be expected if a compact companion were present.

Affiliated with

Also associated with

No associations

Rating

Discovery of extended radio emission in the young cluster Wd1 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 Discovery of extended radio emission in the young cluster Wd1, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Discovery of extended radio emission in the young cluster Wd1 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-461933