1999A&AS..137....7R

Query : 1999A&AS..137....7R

1999A&AS..137....7R - Astron. Astrophys., Suppl. Ser., 137, 7-19 (1999/May-2)

The radio emission from the Galaxy at 22 MHz.

ROGER R.S., COSTAIN C.H., LANDECKER T.L. and SWERDLYK C.M.

Abstract (from CDS):

We present maps of the 22MHz radio emission between declinations -28° and +80°, covering ∼73% of the sky, derived from observations with the 22 MHz radiotelescope at the Dominion Radio Astrophysical Observatory (DRAO). The resolution of the telescope (EWxNS) is 1.1°x1.7° secant (zenith angle). The maps show the large scale features of the emission from the Galaxy including the thick non-thermal disk, the North Polar Spur (NPS) and absorption due to discrete HII regions and to an extended band of thermal electrons within 40° of the Galactic centre. We give the flux densities of nine extended supernova remnants shown on the maps. A comparison of the maps with the 408-MHz survey of Haslam et al. (1982A&AS...47....1H) shows a remarkable uniformity of spectral index (T∝ν–β) of most of the Galactic emission, with β in the range 2.40 to 2.55. Emission from the outer rim of the NPS shows a slightly greater spectral index than the distributed emission on either side of the feature. The mean local synchrotron emissivity at 22MHz deduced from the emission toward nearby extended opaque HII regions is ∼1.5x10–40W/m3/Hz/sr, somewhat greater than previous estimates.

Abstract Copyright: ∼

Journal keyword(s): Galaxy: structure - radio continuum: general - ISM

Simbad objects: 40

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Number of rows : 40
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 7822 HII 00 01 08.58 +67 25 17.0           ~ 121 3
2 SNR G119.5+10.2 SNR 00 06.6 +72 47           ~ 268 1
3 LBN 119.57-00.92 HII 00 21 16 +61 43.5           ~ 39 0
4 SN 1572A SN* 00 25 21.5 +64 08 27           B8 1254 1
5 NAME Loop III SR? 01 12 +78.3           ~ 97 1
6 SNR G132.6+01.5 SNR 02 17 40 +62 45.0           ~ 193 0
7 IC 1805 OpC 02 32 52.1 +61 28 36           ~ 542 1
8 SH 2-205 HII 03 52 14 +53 25.0           ~ 40 0
9 NGC 1499 HII 04 03 18 +36 25.3           ~ 179 0
10 SNR G160.8+02.6 SNR 05 01 00.000 +46 40 00.00           ~ 233 0
11 SH 2-229 HII 05 16 16.1 +34 32 31           ~ 29 0
12 SH 2-230 HII 05 22.5 +34 08           ~ 16 0
13 M 1 SNR 05 34 31.8 +22 01 03           ~ 6516 1
14 V* CM Tau Psr 05 34 31.9474694616 +22 00 52.153698024           ~ 5476 0
15 SH 2-281 HII 05 35 14.5 -05 22 30           ~ 22 1
16 NAME lam Ori Molecular Ring HII 05 35.3 +09 56           ~ 82 1
17 IC 443 SNR 06 17 00.0000000 +22 34 11.998901           ~ 1314 1
18 NAME Rosette Nebula HII 06 32 26.76 +04 47 37.1           ~ 522 1
19 IC 2177 RNe 07 04 25 -10 27.3           ~ 156 2
20 LBN 1033 HII 07 05.9 -11 13           ~ 51 1
21 NAME North Polar Spur ISM 12 00 +00.0           ~ 405 1
22 M 87 AGN 12 30 49.42338414 +12 23 28.0436859 10.16 9.59 8.63   7.49 ~ 7815 3
23 NAME Loop I SR? 15 01 -38.7           ~ 414 2
24 LBN 006.00+24.73 HII 16 35 56.8 -12 43 05           ~ 76 0
25 LBN 018.45+01.87 HII 18 17 52.5 -11 40 58           ~ 60 1
26 SNR G034.6-00.5 SNR 18 56 10.650 +01 13 21.30           ~ 1034 2
27 SH 2-79 HII 19 23.3 +13 58   13.01 12.16     ~ 9 0
28 NGC 6823 OpC 19 43 11.3 +23 18 32   7.71 7.1     ~ 279 2
29 MCG+07-41-003 Bla 19 59 28.35656837 +40 44 02.0972325   16.22 15.10     ~ 2537 2
30 SNR G089.0+04.7 SNR 20 45.0 +50 35           ~ 237 0
31 NAME Cyg Loop SNR 20 51.0 +30 40           ~ 964 0
32 SNR G093.2+06.7 SNR 20 52 25 +55 19.3           ~ 87 0
33 NGC 7000 Cl* 20 58 47 +44 19.8           ~ 427 0
34 SH 2-129 HII 21 11.8 +59 57           ~ 31 0
35 LBN 087.23-03.80 HII 21 18.5 +43 56           ~ 42 0
36 SH 2-131 HII 21 37 07 +57 30.9           ~ 51 1
37 LBN 102.79-00.92 HII 22 19 09.0 +56 04 45           ~ 109 0
38 IRAS 22172+5549 Y*O 22 19 09.14787 +56 05 00.0380           ~ 105 0
39 LBN 108.88+06.09 HII 22 29 15.9 +64 51 08           ~ 16 0
40 NAME Cas A SNR 23 23 26.0 +58 48 41     14.30     ~ 3033 1

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