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J/AJ/133/2559    Compact radio sources in spiral galaxies. II.   (Maddox+, 2007)

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
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 Hα 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 Hα 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, α=-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: ---------------------------------------------------------- RA (2000) DE Designation(s) ---------------------------------------------------------- 13 29 52.4 +47 11 41 M51 = NGC 5194 ---------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 88 107 Positions, Flux Densities and Spectral Indices of Point Sources in M51
See also: J/ApJ/252/102 : Radio sources in bright spiral galaxies. II. (Condon+, 1982) Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 3 I3 --- [MCK2007] Source number 5 A1 --- n_[MCK2007] [b] Radio coincidence (1) 7- 8 I2 h RAh Hour of Right Ascension (J2000) 10- 11 I2 min RAm Minute of Right Ascension (J2000) 13- 17 F5.2 s RAs Second of Right Ascension (J2000) 18 A1 --- DE- Sign of the Declination (J2000) 19- 20 I2 deg DEd Degree of Declination (J2000) 22- 23 I2 arcmin DEm Arcminute of Declination (J2000) 25- 29 F5.2 arcsec DEs Arcsecond of Declination (J2000) 31- 34 I4 uJy S20cm ? 20cm (1.5GHz) flux density in µJy/beam 36- 37 I2 uJy e_S20cm ? Error in S20cm in µJy/beam 39- 42 I4 uJy S6cm ? 6cm (5GHz) flux density in µJy/beam 44- 45 I2 uJy e_S6cm ? Error in S6cm in µJy/beam 47 A1 --- l_alpha Limit flag on spectral index 48- 53 F6.3 --- alpha Spectral Index (2) 55- 59 F5.3 --- e_alpha ? Error in spectral index 61- 76 A16 --- CXOU CXOU designation (JHHMMSS.s+DDMMSS) of X-ray counterpart 78 I1 10+30W LX ? X-ray luminosity in 0.3-2keV band of X-ray counterpart 80- 86 A7 --- XType Source classification based on X-ray colours 88 A1 --- n_CXOU [a] X-ray coincidence (1)
Note (1): Note as follows: a = Coincident with SN 1994I b = Coincident with optical HII region Note (2): Where Sν∝ν.
History: From electronic version of the journal References: Maddox et al. - Paper I. (M83) - 2006AJ....132..310M
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 06-May-2009
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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