Survey of Planetary Nebulae at 30 GHz with OCRA-p

Details Survey of Planetary Nebulae at 30 GHz with OCRA-p Survey of Planetary Nebulae at 30 GHz with OCRA-p

2009-02-23

arxiv.org/abs/0902.3945v1

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

10 pages, 7 Postscript figures, to be published in A&A

Scientific paper

We report the results of a survey of 442 planetary nebulae at 30 GHz. The purpose of the survey is to develop a list of planetary nebulae as calibration sources which could be used for high frequency calibration in future. For 41 PNe with sufficient data, we test the emission mechanisms in order to evaluate whether or not spinning dust plays an important role in their spectra at 30 GHz. The 30-GHz data were obtained with a twin-beam differencing radiometer, OCRA-p, which is in operation on the Torun 32-m telescope. Sources were scanned both in right ascension and declination. We estimated flux densities at 30 GHz using a free-free emission model and compared it with our data. The primary result is a catalogue containing the flux densities of 93 planetary nebulae at 30 GHz. Sources with sufficient data were compared with a spectral model of free-free emission. The model shows that free-free emission can generally explain the observed flux densities at 30 GHz thus no other emission mechanism is needed to account for the high frequency spectra.

Affiliated with

Also associated with

No associations

Rating

Survey of Planetary Nebulae at 30 GHz with OCRA-p 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 Survey of Planetary Nebulae at 30 GHz with OCRA-p, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Survey of Planetary Nebulae at 30 GHz with OCRA-p will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-584864