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J/AJ/133/2559 Compact radio sources in spiral galaxies. II. (Maddox+, 2007)
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Beginning of ReadMe :J/AJ/133/2559 Compact radio sources in spiral galaxies. II. (Maddox+, 2007)
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A study of compact radio sources in nearby face-on spiral galaxies.
II. Multiwavelength analyses of sources in M 51.
Maddox L.A., Cowan J.J., Kilgard R.E., Schinnerer E., Stockdale C.J.
<Astron. J., 133, 2559-2568 (2007)>
=2007AJ....133.2559M
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ADC_Keywords: Radio sources ; Galaxies, nearby ; Cross identifications
Keywords: galaxies: individual (NGC 5194) - H II regions
radio continuum: galaxies - supernova remnants - X-rays: galaxies
Abstract:
We report the analysis of deep radio observations of the interacting
galaxy system M51 from the Very Large Array, with the goal of
understanding the nature of the population of compact radio sources in
nearby spiral galaxies. We detect 107 compact radio sources, 64% of
which have optical counterparts in a deep Halpha Hubble Space Telescope
image. Thirteen of the radio sources have X-ray counterparts from a
Chandra observation of M51. We find that six of the associated Halpha
sources are young supernova remnants (SNRs) with resolved shells. Most
of the SNRs exhibit steep radio continuum spectral indices consistent
with synchrotron emission. We detect emission from the Type Ic SN
1994I nearly a decade after explosion: the emission (160+/-22uJy/beam
at 20cm, 46+/-11uJy/beam at 6cm, alpha=-1.02+/-0.28) is consistent
with light-curve models for Type Ib/Ic supernovae. We detect X-ray
emission from the supernova; however, no optical counterpart is
present. We report on the analysis of the Seyfert 2 nucleus in this
galaxy, including the evidence for bipolar outflows from the central
black hole.
Description:
The 20cm observation was performed on 2002 April 5 for a total of 6hr
while the VLA was in A configuration. The 6cm observations were
performed in B configuration over several days in 2003 December and
2004 January during 22.5hr.
Objects:
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RA (2000) DE Designation(s)
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13 29 52.4 +47 11 41 M51 = NGC 5194
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