2015ApJ...799L..10S

Query : 2015ApJ...799L..10S

2015ApJ...799L..10S - Astrophys. J., 799, L10 (2015/January-3)

Axial ratio of edge-on spiral galaxies as a test for bright radio halos.

SINGAL J., KOGUT A., JONES E. and DUNLAP H.

Abstract (from CDS):

We use surface brightness contour maps of nearby edge-on spiral galaxies to determine whether extended bright radio halos are common. In particular, we test a recent model of the spatial structure of the diffuse radio continuum by Subrahmanyan & Cowsik which posits that a substantial fraction of the observed high-latitude surface brightness originates from an extended Galactic halo of uniform emissivity. Measurements of the axial ratio of emission contours within a sample of normal spiral galaxies at 1500 MHz and below show no evidence for such a bright, extended radio halo. Either the Galaxy is atypical compared to nearby quiescent spirals or the bulk of the observed high-latitude emission does not originate from this type of extended halo.

Abstract Copyright: ∼

Journal keyword(s): Galaxy: halo - radio continuum: galaxies

Simbad objects: 17

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Number of rows : 17
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NGC 253 SyG 00 47 33.134 -25 17 19.68   8.03   6.94 8.1 ~ 3588 2
2 NGC 891 H2G 02 22 32.907 +42 20 53.95 11.08 10.81 9.93 7.86   ~ 1741 2
3 NGC 2613 Sy2 08 33 22.841 -22 58 25.21   11.29 10.42 9.75 10.5 ~ 180 0
4 NGC 3044 AG? 09 53 40.884 +01 34 46.74   12.7   12.7 12.3 ~ 239 1
5 M 82 AGN 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 6156 6
6 NGC 3221 AG? 10 22 19.988 +21 34 10.56   14.3       ~ 151 1
7 M 108 AGN 11 11 30.967 +55 40 26.84   10.70       ~ 497 1
8 NGC 3628 LIN 11 20 17.018 +13 35 22.16   10.42 9.48 9.22   ~ 853 3
9 NGC 4157 GiC 12 11 04.365 +50 29 04.85 12.48 12.15 11.35     ~ 373 2
10 M 98 LIN 12 13 48.2910686976 +14 54 01.953475200 11.25 10.95 10.14     ~ 499 2
11 NGC 4216 AGN 12 15 54.444 +13 08 57.84 11.51 10.99 10.01     ~ 424 1
12 NGC 4437 AGN 12 32 45.586 +00 06 54.14   11.1   11.1 10.6 ~ 307 0
13 NGC 4565 Sy2 12 36 20.804 +25 59 14.61   13.61 12.43     ~ 991 0
14 M 104 LIN 12 39 59.43185902 -11 37 22.9961800 9.51 9.55 8.00 8.05   ~ 1465 2
15 NGC 4631 GiC 12 42 08.009 +32 32 29.44   9.78 9.19 9.10   ~ 1154 3
16 NGC 5906 GiG 15 15 53.687 +56 19 43.86   11.4       ~ 807 0
17 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0

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