2001ApJ...551..702H

Query : 2001ApJ...551..702H

2001ApJ...551..702H - Astrophys. J., 551, 702-711 (2001/April-3)

Radio continuum imaging of the spiral galaxy NGC 4258.

HYMAN S.D., CALLE D., WEILER K.W., LACEY C.K., VAN DYK S.D. and SRAMEK R.

Abstract (from CDS):

We analyze 3".5 resolution, high-sensitivity radio continuum images of the nearby spiral galaxy NGC 4258 at 6 and 20 cm derived from multiple observations used to monitor the radio supernova SN 1981K by Van Dyk et al. Seven bright H II regions and five supernova remnant candidates are identified. Extinctions to the H II regions are estimated for the first time from a comparison of radio flux densities to new optical fluxes derived from Hα observations by Dutil & Roy. The bright end of the H II region luminosity function is established at each wavelength. The luminosity functions are best fit by power laws consistent with the shape of previously published radio and optical luminosity functions for a number of galaxies. The supernova remnants are all about 2-3 times the radio luminosity of Cas A. In addition, the galaxy's nucleus is shown to have been variable over the SN 1981K monitoring period. The spectral index (α) distribution of the anomalous radio arms is investigated and found to be relatively uniform at α=-0.65±0.10.

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Journal keyword(s): ISM: Dust, Extinction - galaxies: individual (NGC 4258, M106) - ISM: H II Regions - Radio Continuum: Galaxies - ISM: Supernova Remnants

Nomenclature: Tables 1, 2: [HCW2001] NNa (Nos 1-17, 16a-16d, 17a-17c).

Simbad objects: 38

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Number of rows : 38
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 12655 1
2 NGC 253 SyG 00 47 33.134 -25 17 19.68   8.03   6.94 8.1 ~ 3342 2
3 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 11156 1
4 M 33 GiG 01 33 50.8965749232 +30 39 36.630403128 6.17 6.27 5.72     ~ 5841 1
5 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 17441 0
6 M 81 Sy2 09 55 33.1726556496 +69 03 55.062505368   7.89 6.94     ~ 4451 3
7 M 82 AGN 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 5864 6
8 [HCW2001] 17 Rad 12 18 45.84 +47 14 23.2           ~ 2 0
9 [HCW2001] 17c Rad 12 18 46.2 +47 14 19           ~ 1 0
10 6W 1216+47W02 Rad 12 18 46.47 +47 14 28.9           ~ 2 0
11 [HCW2001] 17a Rad 12 18 46.6 +47 14 44           ~ 1 0
12 [HCW2001] 8 SR? 12 18 47.9 +47 18 03           ~ 1 0
13 [PVK94] 14 SNR 12 18 54.86 +47 16 50.9           ~ 5 0
14 [HCW2001] 1 HII 12 18 55.2 +47 20 35           ~ 1 0
15 [HCW2001] 10 SR? 12 18 55.347 +47 16 47.95           ~ 4 0
16 RX J121855.4+472025 HII 12 18 55.46 +47 20 25.0           ~ 2 0
17 [HCW2001] 3 SNR 12 18 56.5 +47 20 14           ~ 2 0
18 [HCW2001] 13 Rad 12 18 56.5 +47 23 53           ~ 1 0
19 [HCW2001] 14 Rad 12 18 56.5 +47 23 53           ~ 1 0
20 [CGD2000] N Hot Spot PoG 12 18 57.0 +47 19 04           ~ 6 0
21 [HCW2001] 4 SNR 12 18 57.4 +47 20 05           ~ 2 0
22 M 106 Sy2 12 18 57.620 +47 18 13.39   9.14 8.41 8.11   ~ 2364 3
23 RX J121857.8+471813 X 12 18 57.80 +47 18 13.7           ~ 3 0
24 [CPH93] 54C SNR 12 18 58.13 +47 16 04.2           ~ 5 0
25 [HCW2001] 5 HII 12 18 58.2 +47 19 04           ~ 1 0
26 [HCW2001] 6 HII 12 18 58.2 +47 19 10           ~ 1 0
27 SN 1981K SN* 12 18 59.42 +47 19 31.0   16.0 16.0     SNII 48 1
28 [HCW2001] 9 SNR 12 19 01.3 +47 15 25           ~ 2 0
29 [HCW2001] 15 Rad 12 19 19.0 +47 19 08           ~ 1 0
30 [HCW2001] 16d Rad 12 19 31.0 +47 17 39           ~ 1 0
31 [HCW2001] 16b Rad 12 19 31.0 +47 17 39           ~ 1 0
32 [HCW2001] 16c Rad 12 19 31.5 +47 17 48           ~ 1 0
33 [HCW2001] 16 Rad 12 19 32.51 +47 18 20.6           ~ 2 0
34 [HCW2001] 16a Rad 12 19 32.6 +47 18 20           ~ 1 0
35 M 51 Sy2 13 29 52.698 +47 11 42.93   9.26 8.36 8.40   ~ 4330 4
36 NGC 6946 H2G 20 34 52.332 +60 09 13.24   10.5       ~ 2531 2
37 3C 461 BL? 23 23 24.000 +58 48 54.00     14.30     ~ 2792 1
38 NAME Local Group GrG ~ ~           ~ 8399 0

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