Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...332l..67d&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 332, Sept. 15, 1988, p. L67-L70.
Astronomy and Astrophysics
Astronomy
45
H Ii Regions, Radio Sources (Astronomy), Spiral Galaxies, Supernova Remnants, Bremsstrahlung, Cosmic Rays, H Alpha Line, Relativistic Particles, Star Formation, Very Large Array (Vla)
Scientific paper
The discovery of 19 compact radio sources in the near-nuclear region of the spiral galaxy NGC 4736 is reported. Nine are found to have thermal bremsstrahlung spectra. Their small sizes of 1-2 arcsec (20-40 pc at a distance of 4 Mpc), combined with typical flux densities of 0.3-1.0 mJy at 20 cm, suggest high gas densities of 60-270/cu cm. It is proposed that these are H II regions associated with recently formed stars. The remaining 10 sources are all unresolved to 1 arcsec (20 pc) and have synchrotron spectra. Equipartition calculations show that the limits on the relativistic particle energies and magnetic field strengths are consistent with values found for Galactic SNRs. Furthermore, the radio luminosities and small sizes of these sources suggest that these are young SNRs.
Dittmar Melissa R.
Duric Nebojsa
No associations
LandOfFree
The discovery of a population of compact radio sources in the spiral galaxy NGC 4736 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 The discovery of a population of compact radio sources in the spiral galaxy NGC 4736, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The discovery of a population of compact radio sources in the spiral galaxy NGC 4736 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-909590