2005A&A...432....1M

Query : 2005A&A...432....1M

2005A&A...432....1M - Astronomy and Astrophysics, volume 4321-14 (2005/3-2)

Multi-density model of the ionised gas in NGC 253 using radio recombination lines.

MOHAN N.R., GOSS W.M. and ANANTHARAMAIAH K.R.

Abstract (from CDS):

We have imaged the H92α (8.3GHz), H75α (15GHz), and H166α (1.4GHz) Radio Recombination Lines (RRLs) from NGC 253 at resolutions of 4.5pc (0.4''), 2.5 pc (0.2'') and 53 pc (4.5'') respectively. The H92α line arises from individual compact sources, most of which possess radio continuum counterparts. The line widths range from ∼200km/s for the sources near the radio nucleus to 70-100km/s for the extranuclear ones. These lines are emitted by gas at a density ∼104cm–3. The remainder of the cm-wave RRLs arise in lower density gas (∼500cm–3) with a higher area filling factor and with ten times higher mass. A third component of higher density gas (>104cm–3) is required to explain the mm-wave RRLs.

Abstract Copyright: ∼

Journal keyword(s): galaxies: individual: NGC 253 - galaxies: ISM - galaxies: starburst - radio lines: galaxies - radio lines: ISM

Nomenclature: Fig.9, Table 3: [MGA2005] H92alp N (Nos 1-4). Table A1: [MGA2005] AN (Nos S1-S9). Table A1: [U2000] NN (Nos 23-25) added.

CDS comments: Table 3: The second H75alp source = [AU88] 5.76-38.9 in SIMBAD.

Simbad objects: 28

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Number of rows : 28
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 [MGA2005] S4 Rad 00 45 17.56 -25 30 00.0           ~ 1 0
2 [MGA2005] S1 Rad 00 47 00.04 -25 23 48.9           ~ 1 0
3 [MGA2005] S2 Rad 00 47 03.40 -25 10 30.3           ~ 1 0
4 [MGA2005] S3 Rad 00 47 12.46 -25 17 43.3           ~ 2 0
5 [LT2006b] 5.49 -42.3 HII 00 47 32.87 -25 17 20.3           ~ 4 0
6 [LT2006b] 5.59 -41.6 HII 00 47 32.983 -25 17 19.50           ~ 9 0
7 [MGA2005] H92alp 1 Rad 00 47 33.10 -25 17 16.7           ~ 1 0
8 [LT2006b] 5.72 -40.1 HII 00 47 33.112 -25 17 17.92           ~ 17 0
9 [MGA2005] H92alp 2 Rad 00 47 33.12 -25 17 17.6           ~ 1 0
10 [MGA2005] H92alp 3 Rad 00 47 33.13 -25 17 16.6           ~ 1 0
11 [AU88] 5.75-39.9 Rad 00 47 33.13 -25 17 17.9           ~ 3 0
12 NGC 253 SyG 00 47 33.134 -25 17 19.68   8.03   6.94 8.1 ~ 3588 2
13 [AU88] 5.75-41.8 SNR 00 47 33.138 -25 17 19.77           ~ 9 0
14 [AU88] 5.77-38.9 Rad 00 47 33.15 -25 17 16.9           ~ 2 0
15 [MGA2005] H92alp 4 cor 00 47 33.152 -25 17 17.16           ~ 11 0
16 [U2000] 15 HII 00 47 33.453 -25 15 33.75           ~ 2 0
17 [U2000] 19 SNR 00 47 39.422 -25 16 34.24           ~ 3 0
18 [U2000] 23 Rad 00 47 40.25 -25 15 02.2           ~ 1 0
19 [U2000] 20 SNR 00 47 40.471 -25 16 39.22           ~ 4 0
20 [U2000] 24 Rad 00 47 43.02 -25 15 29.5           ~ 1 0
21 [U2000] 22 SNR 00 47 43.180 -25 15 39.83           ~ 4 0
22 [U2000] 25 Rad 00 47 44.13 -25 15 52.2           ~ 1 0
23 [MGA2005] S5 Rad 00 47 54.82 -25 12 31.5           ~ 1 0
24 [MGA2005] S6 Rad 00 47 58.61 -25 18 31.1           ~ 2 0
25 [MGA2005] S8 Rad 00 48 01.08 -25 16 27.7           ~ 1 0
26 [MGA2005] S7 Rad 00 48 01.26 -25 27 38.3           ~ 1 0
27 [MGA2005] S9 Rad 00 48 05.01 -25 11 13.5           ~ 1 0
28 NGC 1808 Sy2 05 07 42.343 -37 30 46.98 11.05 10.80 9.94 9.36 10.2 ~ 756 3

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