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

Full paper

View the references in ADS

Number of rows : 40

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Mag I	Sp type	#ref 1850 - 2023	#notes
1	NGC 7822	HII	00 01 08.58	+67 25 17.0					~	117	3
2	SNR G119.5+10.2	SNR	00 06.6	+72 47					~	246	1
3	LBN 119.57-00.92	HII	00 21 16	+61 43.5					~	38	0
4	SN 1572A	SN*	00 25 21.5	+64 08 27					B8	1155	1
5	NAME Loop III	SR?	01 12	+78.3					~	87	1
6	SNR G132.6+01.5	SNR	02 17 40	+62 45.0					~	173	0
7	IC 1805	OpC	02 32 50	+61 28.3		7.03	6.5		~	507	2
8	SH 2-205	HII	03 52 14	+53 25.0					~	37	0
9	NGC 1499	HII	04 03 18	+36 25.3					~	168	0
10	SNR G160.8+02.6	SNR	05 01 00.000	+46 40 00.00					~	206	0
11	SH 2-229	HII	05 16 16.1	+34 32 31					~	27	0
12	SH 2-230	HII	05 22.5	+34 08					~	16	0
13	V* CM Tau	Psr	05 34 31.9474694616	+22 00 52.153698024					~	5104	0
14	M 1	SNR	05 34 32	+22 00.8					~	6004	1
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					~	75	1
17	IC 443	SNR	06 17.0	+22 34					~	1193	1
18	NAME Rosette Nebula	HII	06 32 26.76	+04 47 37.1					~	480	1
19	IC 2177	RNe	07 04 25	-10 27.3					~	150	2
20	LBN 1033	HII	07 05.9	-11 13					~	46	1
21	NAME North Polar Spur	ISM	12 00	+00.0					~	347	1
22	M 87	AGN	12 30 49.42338414	+12 23 28.0436859	10.16	9.59	8.63	7.49	~	6831	3
23	NAME Loop I	SR?	15 01	-38.7					~	365	2
24	LBN 006.00+24.73	HII	16 35 56.8	-12 43 05					~	59	0
25	LBN 018.45+01.87	HII	18 17 52.5	-11 40 58					~	56	1
26	SNR G034.6-00.5	SNR	18 56 10.650	+01 13 21.30					~	926	2
27	SH 2-79	HII	19 23.3	+13 58		13.01	12.16		~	9	0
28	NGC 6823	OpC	19 43 11	+23 19.3		7.71	7.1		~	267	2
29	NAME Cyg A	Sy2	19 59 28.35656837	+40 44 02.0972325		16.22	15.10		~	2279	2
30	SNR G089.0+04.7	SNR	20 45.0	+50 35					~	217	0
31	NAME Cyg Loop	SNR	20 51.0	+30 40					~	883	0
32	SNR G093.2+06.7	SNR	20 52 25	+55 19.3					~	77	0
33	NGC 7000	Cl*	20 58 47	+44 19.8					~	389	0
34	SH 2-129	HII	21 11.8	+59 57					~	29	0
35	LBN 087.23-03.80	HII	21 18.5	+43 56					~	41	0
36	SH 2-131	HII	21 37 07	+57 30.9					~	47	1
37	LBN 102.79-00.92	HII	22 19 09.0	+56 04 45					~	103	0
38	IRAS 22172+5549	Y*O	22 19 09.14787	+56 05 00.0380					~	104	0
39	LBN 108.88+06.09	HII	22 29 15.9	+64 51 08					~	14	0
40	NAME Cas A	SNR	23 23 24.000	+58 48 54.00			14.30		~	2669	1

To bookmark this query, right click on this link: simbad:objects in 1999A&AS..137....7R and select 'bookmark this link' or equivalent in the popup menu