2008A&A...483...79R


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.04CEST20:55:38

2008A&A...483...79R - Astronomy and Astrophysics, volume 483, 79-88 (2008/5-3)

Detection of the H92α recombination line from the starbursts in the Circinus galaxy and NGC 1808.

ROY A.L., GOSS W.M. and ANANTHARAMAIAH K.R.

Abstract (from CDS):

Gas ionized by starburst activity radiates radio recombination lines (RRLs), from which one can derive the plasma conditions and the number of massive stars formed in the burst, free of dust obscuration effects. We aimed to find detectable RRL emission from additional extragalactic starburst systems and to use the line properties to estimate the properties of the ionized gas. We conducted a search for RRLs in the nearby extragalactic starburst or Seyfert galaxies NGC1808, the Circinus galaxy, NGC4038/9, IIZw40, NGC6221, NGC7552, IRAS18325-5926, IC5063, and VV114. We used the Very Large Array with resolution of 3'' to 32'' and the Australia Telescope Compact Array with resolution of 10'' to search for the RRLs H91α and H92α with rest frequencies of 8.6GHz and 8.3GHz. From the new detections we derive conditions in the starburst regions. We detected for the first time RRLs from the starburst nuclei in the Circinus galaxy and NGC1808. The Circinus galaxy was detected in RRL emission with a line strength integrated over the source of 3.2mJy, making it the fourth-strongest extragalactic RRL emitter known at this frequency (after NGC4945, M82, and NGC253) and so is suitable for detailed study. The line and continuum emission from the Circinus galaxy can be matched by a model consisting of a collection of 50 to 10000 H II regions with temperatures of 5000K, densities of 500cm–3 to 50000/cm3, and a total effective diameter of 3pc to 50pc. The Lyman continuum production rate required to maintain the ionization is 1x1052s–1 to 3x1053s–1, which requires 300 to 9000 O5 stars to be produced in the starburst, inferring a star formation rate of 0.2M/yr to 6M/yr. NGC1808 was detected in RRL emission at 3.9σ with a line strength of 0.47mJy at the expected velocity. No radio recombination lines were detected from the other galaxies surveyed to a 3σ limit of 0.3mJy to 1.4mJy. We have detected RRLs from two galaxies, adding to the small but growing number of known extragalactic RRL emitters. The Circinus galaxy is strong and especially suited to high-quality follow-up spectroscopic study. We derived conditions and star formation rates in the starbursting regions. Uncertainties can be reduced by future multi-transition studies.

Abstract Copyright:

Journal keyword(s): galaxies: individual: NGC 1808 - galaxies: nuclei - radio lines: galaxies

CDS comments: Table 1 Phase calibrator 1414-596 not identified, maybe GB6 B1414+5914. Paragraphe 5. source 54.96-06.1 is [SVB2006] 2 in Simbad.

Simbad objects: 48

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Number of rows : 48

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NGC 253 SyG 00 47 33.134 -25 17 19.68   8.03   6.94 8.1 ~ 2929 2
2 IC 1623 IG 01 07 47.2 -17 30 25   15       ~ 261 1
3 IC 1623A EmG 01 07 47.2 -17 30 28   14.34   12.71   ~ 44 2
4 IC 1623B rG 01 07 47.569 -17 30 25.04   15.04   14.07   ~ 59 1
5 QSO B0113-1152 QSO 01 16 12.52201569 -11 36 15.4343096   18.5 18.5 17.72   ~ 152 1
6 3C 48 QSO 01 37 41.2995845985 +33 09 35.079126038   16.62 16.20     ~ 2495 2
7 NGC 660 LIN 01 43 02.350 +13 38 44.45   12.02 11.16     ~ 507 2
8 ACO 426 ClG 03 19 47.2 +41 30 47           ~ 1939 1
9 NGC 1365 Sy1 03 33 36.458 -36 08 26.37 10.48 10.08 9.63 8.79 9.7 ~ 1523 2
10 QSO J0403-3605 QSO 04 03 53.7499146834 -36 05 01.914911296   17.04 17.17 16.67   ~ 235 1
11 NGC 1792 EmG 05 05 14.454 -37 58 50.70   10.68 10.18 9.53 10.4 ~ 197 1
12 NGC 1808 Sy2 05 07 42.343 -37 30 46.98 11.05 10.80 9.94 9.36 10.2 ~ 648 3
13 [CSP94] NGC 1808 59.09-41.2 Rad 05 07 42.84 -37 30 50.7           ~ 3 0
14 [CSP94] NGC 1808 59.16-41.0 Rad 05 07 42.91 -37 30 50.5           ~ 3 0
15 QSO J0530+13 QSO 05 30 56.41672 +13 31 55.1495     20.0 19.35   ~ 879 1
16 QSO B0537-441 BLL 05 38 50.36155219 -44 05 08.9389165   15.77 16.48 16   ~ 786 2
17 UGCA 116 H2G 05 55 42.645 +03 23 32.23 10.74 11.68 11.46   11.82 ~ 500 0
18 NGC 2146 SBG 06 18 37.710 +78 21 25.27 11.67 11.38 10.59     ~ 624 2
19 ESO 495-21 bCG 08 36 15.190 -26 24 33.66 12.04 11.93 11.45 11.09 12.3 ~ 499 3
20 M 82 IG 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 5331 6
21 NGC 3256 IG 10 27 51.284 -43 54 13.55   11.83 11.33 10.62 11.9 ~ 754 2
22 NGC 3628 GiP 11 20 17.018 +13 35 22.16   10.42 9.48 9.22   ~ 750 3
23 IC 694 G 11 28 27.312 +58 34 42.29   18.2       ~ 236 2
24 NAME NGC 3690 West GiP 11 28 30.69 +58 33 33.4   11.8       ~ 608 4
25 NGC 3690 IG 11 28 31.326 +58 33 41.80   13.19 12.86     ~ 883 4
26 NAME NGC 3690 East AGN 11 28 33.07 +58 33 54.2   11.8       ~ 613 4
27 QSO J1130-1449 QSO 11 30 07.05259287 -14 49 27.3881476   17.17 16.90 16 16.97 ~ 625 1
28 NGC 4038 GiP 12 01 53.002 -18 52 03.32   10.91   9.74 11.0 ~ 1274 1
29 NAME Antennae IG 12 01 53.170 -18 52 37.92           ~ 1555 0
30 NGC 4039 GiP 12 01 53.8 -18 53 06   11.08   9.77   ~ 1130 1
31 [BCE2005] 136 PoG 12 01 54.9 -18 53 04           ~ 35 0
32 NGC 4945 Sy2 13 05 27.279 -49 28 04.44   9.31 14.40 7.55   ~ 1264 2
33 M 83 SBG 13 37 00.919 -29 51 56.74 8.85 8.11 7.52 7.21   ~ 2228 2
34 NGC 5253 AGN 13 39 55.990 -31 38 24.11 11.48 10.94 10.49 10.33   ~ 1269 4
35 NAME Circinus Galaxy Sy2 14 13 09.906 -65 20 20.47   10.89 9.84 10.6 10.0 ~ 1007 2
36 IC 4553 SyG 15 34 57.22396 +23 30 11.6084   14.76 13.88     ~ 2679 4
37 NGC 6221 Sy2 16 52 46.329 -59 13 00.99   10.90 13.45 9.68 10.4 ~ 279 0
38 ICRF J174425.4-514443 AGN 17 44 25.45077 -51 44 43.7930     20.2     ~ 75 1
39 FRL 49 Sy2 18 36 58.2344504326 -59 24 08.288330694   11.1   14.19   ~ 208 0
40 QSO B1921-293 BLL 19 24 51.05595514 -29 14 30.1210524   18.71 18.21 15.07   ~ 689 0
41 ICRF J193925.0-634245 Sy2 19 39 25.02671 -63 42 45.6255   18.87 18.37 17.64   ~ 953 1
42 IC 5063 Sy2 20 52 02.329 -57 04 07.60   12.92 13.60 11.30   ~ 543 1
43 QSO B2227-3928 QSO 22 30 32.9046734701 -39 13 06.419841832   19 18.8     ~ 26 0
44 3C 454.3 QSO 22 53 57.74798 +16 08 53.5611   16.57 16.10 15.22   ~ 2505 2
45 ICRF J225805.9-275821 Sy1 22 58 05.96288481 -27 58 21.2567425   17.34 16.77 17.20   ~ 292 1
46 QSO B2311-452 QSO 23 14 09.3826098253 -44 55 49.239933264   19.0 19     ~ 42 1
47 NGC 7552 GiP 23 16 10.767 -42 35 05.39 11.34 11.22 10.57 10.08 11.1 ~ 506 3
48 QSO B2313-439 QSO 23 16 21.0993266472 -43 37 46.911267255   19.0 20.1     ~ 20 1

    Equat.    Gal    SGal    Ecl

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2020.07.04-20:55:38

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