2003ApJ...593..733R

Query : 2003ApJ...593..733R

2003ApJ...593..733R - Astrophys. J., 593, 733-759 (2003/August-3)

Nascent starbursts in synchrotron-deficient galaxies with hot dust.

ROUSSEL H., HELOU G., BECK R., CONDON J.J., BOSMA A., MATTHEWS K. and JARRETT T.H.

Abstract (from CDS):

Three nearby galaxies that have abnormally high infrared-to-radio continuum ratios, NGC 1377, IC 1953, and NGC 4491, are investigated with a view to understanding the physical origin of their peculiarity. We review the existing data and present new radio continuum measurements along with near-infrared integral-field spectroscopy and molecular gas observations. The three galaxies have low luminosities but starburst-like infrared colors; in NGC 1377, no synchrotron emission is detected at any wavelength; in IC 1953, the observed synchrotron component is attributable to the spiral disk alone and is lacking in the central regions; and the radio spectrum of NGC 4491 is unusually flat. We also compare and contrast them with NGC 4418, a heavily extinguished galaxy that shares some attributes with them. After examining various scenarios, we conclude that these galaxies are most likely observed within a few megayears of the onset of an intense star formation episode after being quiescent for at least ~100 Myr. This starburst, while heating the dust, has not produced optical signatures or a normal amount of cosmic rays yet. We briefly discuss the statistics of such galaxies and what they imply for star formation surveys.

Abstract Copyright: ∼

Journal keyword(s): Galaxies: Starburst - Galaxies: Individual: Alphanumeric: IC 1953 - Galaxies: Individual: NGC Number: NGC 1377 - Galaxies: Individual: NGC Number: NGC 4418 - Galaxies: Individual: NGC Number: NGC 4491 - Infrared: Galaxies - Radio Continuum: Galaxies - ISM: Supernova Remnants

Errata: erratum vol. 601, p.1160 (2004)

Simbad objects: 39

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Number of rows : 39
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 253 SyG 00 47 33.134 -25 17 19.68   8.03   6.94 8.1 ~ 3588 2
2 SNR B0057-72.2 SNR 00 59 27.40 -72 10 10.7   12.37 12.57     ~ 251 0
3 NGC 1022 GiG 02 38 32.703 -06 40 38.60 12.33 12.09 11.34     ~ 213 1
4 LEDA 11044 AGN 02 55 34.4315511384 +02 23 41.539669548   16.62       ~ 36 0
5 ESO 548-36 EmG 03 33 27.698 -21 33 53.05   14.01   13.02   ~ 37 0
6 IC 1953 GiG 03 33 41.885 -21 28 43.03   12.41   12.3 12.1 ~ 126 0
7 MCG-04-09-028 AG? 03 33 51.32 -21 27 19.7   14.59   13.64 14.3 ~ 22 0
8 NGC 1377 GiG 03 36 39.077 -20 54 08.14   13.38   12.12   ~ 241 0
9 ACO S 373 ClG 03 38 29.4 -35 27 08           ~ 2029 0
10 NAME Eridanus ClG GrG 03 38 32.00 -22 18 51.0           ~ 200 0
11 NGC 1808 Sy2 05 07 42.343 -37 30 46.98 11.05 10.80 9.94 9.36 10.2 ~ 756 3
12 ICRF J052109.8+163822 Sy1 05 21 09.88596258 +16 38 22.0515459   19.37 18.84 18.480   ~ 910 1
13 NGC 2146 AGN 06 18 37.710 +78 21 25.27 11.67 11.38 10.59     ~ 765 2
14 M 82 AGN 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 6156 6
15 NGC 4027 AG? 11 59 30.168 -19 15 54.62   11.71 11.10 10.60 11.5 ~ 250 1
16 NGC 4102 Sy2 12 06 23.11513 +52 42 39.4160   11.8       ~ 449 1
17 [M60b]+36 29 * 12 14 25.3591604448 +35 35 54.611229336   13.13 12.63 12.56   G0 13 0
18 NGC 4228 SBG 12 15 39.174 +36 19 36.80 10.63 10.30 9.93 9.74   ~ 1017 1
19 NGC 4293 LIN 12 21 12.891 +18 22 56.64   11.6       ~ 311 2
20 NGC 4388 Sy2 12 25 46.820 +12 39 43.45 11.91 11.76 11.02     ~ 1433 2
21 NGC 4394 GiP 12 25 55.6366312872 +18 12 50.110707636   11.9       ~ 379 0
22 NGC 4355 Sy2 12 26 54.6206739120 -00 52 39.421212996   14.21 13.37     ~ 527 2
23 NAME Virgo Cluster ClG 12 30 47.8 +12 23 07           ~ 7107 0
24 M 87 AGN 12 30 49.42338414 +12 23 28.0436859 10.16 9.59 8.63   7.49 ~ 7815 3
25 NGC 4491 GiG 12 30 57.1112012592 +11 29 00.698250624   13.50 12.55     ~ 164 1
26 IC 3446 GiG 12 31 23.137 +11 29 34.15   15.63       ~ 85 1
27 NGC 4497 GiG 12 31 32.5217419824 +11 37 28.966695744 13.44 13.19 12.47     ~ 107 1
28 NGC 4519 GiG 12 33 30.278 +08 39 16.06   12.8       ~ 295 0
29 NGC 4535 H2G 12 34 20.3443516704 +08 11 51.908488116   11.1       ~ 679 0
30 M 90 Sy2 12 36 49.8009839880 +13 09 46.523813040 10.56 10.26 9.54     ~ 953 1
31 M 58 Sy2 12 37 43.59747 +11 49 05.1240 10.80 10.48 9.66     ~ 1140 2
32 NGC 4580 LIN 12 37 48.3754581432 +05 22 06.630315636   13.1       ~ 233 0
33 NAME Centaurus A BLL 13 25 27.61521044 -43 01 08.8050291   8.18 6.84 6.66   ~ 4774 3
34 3C 286 Sy1 13 31 08.2883506368 +30 30 32.960091564   17.51 17.25     ~ 4558 2
35 NGC 5253 rG 13 39 55.990 -31 38 24.11 11.48 10.94 10.49 10.33 13.47 ~ 1421 4
36 IC 1127 SyG 15 34 57.22396 +23 30 11.6084   14.76 13.88     ~ 3090 4
37 NGC 6240 Sy2 16 52 58.9 +02 24 03   14.31 13.37     ~ 1734 2
38 MCG+07-41-003 Bla 19 59 28.35656837 +40 44 02.0972325   16.22 15.10     ~ 2537 2
39 [CLC2000] peak E IR ~ ~           ~ 4 0

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