2012MNRAS.419.1136B


C.D.S. - SIMBAD4 rel 1.7 - 2021.06.24CEST05:20:52

2012MNRAS.419.1136B - Mon. Not. R. Astron. Soc., 419, 1136-1152 (2012/January-2)

GMRT 333-MHz observations of six nearby normal galaxies.

BASU A., MITRA D., WADADEKAR Y. and ISHWARA-CHANDRA C.H.

Abstract (from CDS):

We report Giant Metrewave Radio Telescope (GMRT) continuum observations of six nearby normal galaxies at 333 MHz. The galaxies are observed with angular resolutions better than ∼ 20 arcsec (corresponding to a linear scale of about 0.4-1 kpc). These observations are sensitive to all angular scales of interest, since the resolution of the shortest baseline in GMRT is greater than the angular size of the galaxies. Furthermore, for five of these galaxies we show that at 333 MHz, the mean thermal fraction is less than 5 per cent. Using archival data at about 1 GHz, we estimate the mean thermal fraction to be about 10 per cent at that frequency. We also find that the non-thermal spectral index is generally steeper in regions with low thermal fraction and/or located in the outer parts of the galaxy. In regions of high thermal fraction, the non-thermal spectral index is flatter, and has a narrow distribution peaking at ∼ -0.78 with a spread of 0.16, putting stringent constraints on the physical conditions for generation, diffusion and energy losses of cosmic ray electrons at scales of ∼ 1 kpc.

Abstract Copyright: 2011 The Authors Monthly Notices of the Royal Astronomical Society2011 RAS

Journal keyword(s): techniques: image processing - techniques: interferometric - cosmic rays - H {sc ii} regions - galaxies: spiral - radio continuum: galaxies

Simbad objects: 14

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Number of rows : 14

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 M 74 G 01 36 41.772 +15 47 00.46 10.52 10.00 9.46 9.16   ~ 1475 1
2 3C 48 QSO 01 37 41.2995845985 +33 09 35.079126038   16.62 16.20     ~ 2595 2
3 [BFS2005] J024612.75-301705.3 rG 02 46 12.75 -30 17 05.3           ~ 2 0
4 NGC 1097 LIN 02 46 19.059 -30 16 29.68 10.46 9.97 9.48 8.72 9.8 ~ 1212 3
5 ICRF J054236.1+495107 Sy1 05 42 36.13789843 +49 51 07.2337251   18.45 17.80 17.210   ~ 1318 1
6 M 82 IG 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 5465 6
7 M 66 GiP 11 20 15.026 +12 59 28.64 9.85 9.65 8.92     ~ 1206 4
8 M 94 SyG 12 50 53.148 +41 07 12.55 9.15 8.96 8.24 7.78   ~ 1262 2
9 M 63 LIN 13 15 49.2738527699 +42 01 45.726078017   9.34 8.59 8.35   ~ 1101 2
10 3C 286 Sy1 13 31 08.2885060664 +30 30 32.960825107   17.51 17.25     ~ 3881 2
11 M 83 SBG 13 37 00.919 -29 51 56.74 8.85 8.11 7.52 7.21   ~ 2303 2
12 NGC 6946 H2G 20 34 52.332 +60 09 13.24   10.5       ~ 2314 2
13 [VAR77] C HII 20 35 06 +60 11.0           ~ 4 0
14 NGC 7331 LIN 22 37 04.102 +34 24 57.31 10.65 10.35 9.48     ~ 1138 2

    Equat.    Gal    SGal    Ecl

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2021.06.24-05:20:53

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