2001PASP..113..142G

Query : 2001PASP..113..142G

2001PASP..113..142G - Publ. Astron. Soc. Pac., 113, 142-153 (2001/February-0)

The star clusters in the irregular galaxy NGC 4449.

GELATT A.E., HUNTER D.A. and GALLAGHER J.S.

Abstract (from CDS):

We examine the star clusters in the luminous irregular galaxy NGC 4449. We use a near-infrared spectrum and broadband images taken with the Hubble Space Telescope to place a limit of 8-15 Myr on the age of the bright central object in NGC 4449. Its luminosity and size suggest that it is comparable to young super star clusters. However, there is a peculiar nucleated-bar structure at the center of this star cluster, and we suggest that this structure is debris from the interaction that has produced the counterrotating gas systems and extended gas streamers in the galaxy. From the images we identify 60 other candidate compact star clusters in NGC 4449. Fourteen of these could be background elliptical galaxies or old globular star clusters. Of the star clusters, three, in addition to the central object, are potentially super star clusters, and many others are comparable to the populous clusters found in the Large Magellanic Cloud. The star clusters span a large range in ages with no obvious peak in cluster formation that might be attributed to the interaction that the galaxy has experienced.

Abstract Copyright: ∼

Journal keyword(s): Galaxies: Individual: NGC Number: NGC 4449 - Galaxies: Irregular - Galaxies: Star Clusters - Stars: Formation

Nomenclature: Table 3: [GHG2001] NN (Nos 1-61).

CDS comments: The central cluster is [GHG2001] 1.

Simbad objects: 79

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Number of rows : 79
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 * chi Peg PM* 00 14 36.1642825005 +20 12 24.130377664 8.280 6.380 4.800 3.45 2.32 M2+III 197 0
2 * ksi And * 01 22 20.4200755704 +45 31 43.596248844   5.951 4.868     K0-IIIb 142 0
3 * sig Per V* 03 30 34.4853660216 +47 59 42.778854240 7.25 5.71 4.36     K3-III 135 0
4 NGC 1569 rG 04 30 49.186 +64 50 52.52 11.72 11.86 11.03     ~ 1297 3
5 NGC 1705 Sy2 04 54 13.4661493464 -53 21 39.471592428 12.32 12.96 12.56 12.58 12.9 ~ 692 1
6 NGC 1818 GlC 05 04 13.300 -66 26 05.47           ~ 279 0
7 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
8 RMC 136 Cl* 05 38 42.396 -69 06 03.36   5.81 5.40     ~ 2236 2
9 Z 216-4 GiG 12 27 40.90 +43 29 44.0 13.75 13.10 12.7 12.33   ~ 270 0
10 [GHG2001] 2 Cl* 12 27 59.75830 +44 04 58.5123   22.697 22.406   21.748 ~ 2 0
11 [ATA2011] 74 GlC 12 28 02.54 +44 05 18.4   22.780 22.599   22.224 ~ 5 0
12 [ATA2011] 75 GlC 12 28 02.5708510104 +44 04 51.126271428   21.29 20.62   20.993 ~ 5 0
13 [GHG2001] 4 GlC 12 28 02.758 +44 05 04.89   22.947 22.337   21.335 ~ 3 0
14 [GHG2001] 6 Cl* 12 28 03.247 +44 04 44.39   23.058 22.723   22.088 ~ 3 0
15 [GHG2001] 7 GlC 12 28 03.8371861968 +44 04 14.936412036   21.403 20.627   19.537 ~ 5 0
16 [GHG2001] 8 GlC 12 28 04.6458623760 +44 04 53.093459784   21.788 21.016   19.980 ~ 5 0
17 [GHG2001] 9 GlC 12 28 05.526 +44 05 19.99 22.457 22.613 22.306   21.703 ~ 3 0
18 [GHG2001] 10 Cl* 12 28 05.88 +44 06 59.9           ~ 1 0
19 [ATA2011] 68 GlC 12 28 06.24 +44 05 16.0 21.815 21.871 21.685   21.215 ~ 4 0
20 [GHG2001] 12 Cl* 12 28 06.28 +44 06 51.8           ~ 1 0
21 [GHG2001] 13 GlC 12 28 06.3957887856 +44 05 54.791424564 20.222 20.125 19.373   18.350 ~ 5 0
22 [GHG2001] 14 GlC 12 28 06.6008688432 +44 06 07.456664880 20.736 20.627 19.870   18.836 ~ 5 0
23 [ATA2011] 73 Cl* 12 28 06.87 +44 04 20.5   19.789 19.967   20.238 ~ 3 0
24 [ATA2011] 49 Cl* 12 28 07.0325526840 +44 06 17.501694588 19.614 20.47 20.16   21.227 ~ 3 0
25 [ATA2011] 63 GlC 12 28 07.3612663608 +44 05 14.708264856 21.977 21.974 21.626   21.022 ~ 4 0
26 [GHG2001] 18 Cl* 12 28 07.68 +44 06 31.7           ~ 1 0
27 [ATA2011] 65 GlC 12 28 08.7748167408 +44 04 51.695389956 21.131 21.204 20.977   20.519 ~ 4 0
28 [GHG2001] 20 Cl* 12 28 09.23 +44 05 14.5           ~ 1 0
29 [GHG2001] 21 Cl* 12 28 09.32739 +44 05 08.4823 17.197 18.597 18.676   18.309 ~ 2 0
30 [ATA2011] 56 Cl* 12 28 09.65 +44 05 16.3 16.615 18.478 18.311   18.508 ~ 3 0
31 [ATA2011] 55 Cl* 12 28 09.7006646136 +44 05 19.407965352 18.243 19.650 19.814   19.975 ~ 3 0
32 [ATA2011] 57 Cl* 12 28 09.90 +44 05 09.8 17.349 18.793 18.971   19.196 ~ 3 0
33 [GHG2001] 25 Cl* 12 28 10.21 +44 06 59.1           ~ 1 0
34 [ATA2011] 34 GlC 12 28 10.2782796576 +44 06 21.048754572 20.154 20.092 19.346   18.362 ~ 6 0
35 [ATA2011] 48 GlC 12 28 10.3100773008 +44 05 35.475763272 19.614 19.609 19.241   18.477 ~ 10 0
36 [GHG2001] 28 Cl* 12 28 10.52856 +44 05 14.8956 20.950 21.104 20.857   20.311 ~ 2 0
37 [GHG2001] 29 Cl* 12 28 11.04 +44 05 35.2           ~ 1 0
38 [GHG2001] 1 GlC 12 28 11.088 +44 05 37.11 16.540 17.478 17.186   16.323 ~ 10 0
39 NGC 4449 EmG 12 28 11.118 +44 05 36.81 10.11 9.98 9.64 9.45   ~ 1192 1
40 [ATA2011] 40 Cl* 12 28 11.12 +44 05 45.6 19.181 19.695 19.157   18.224 ~ 3 0
41 [ATA2011] 43 Cl* 12 28 11.22 +44 05 38.1 16.440 17.43 17.25   16.93 ~ 9 0
42 [GHG2001] 32 Cl* 12 28 11.25 +44 05 44.1           ~ 1 0
43 [GHG2001] 33 Cl* 12 28 11.33 +44 05 40.3           ~ 1 0
44 [GHG2001] 35 Cl* 12 28 11.34888 +44 06 39.2706 20.310 21.629 21.531   20.715 ~ 2 0
45 [ATA2011] 53 GlC 12 28 11.4175547976 +44 05 00.254273532 20.477 20.00 19.78   20.304 ~ 4 0
46 [ATA2011] 36 Cl* 12 28 12.01 +44 05 47.6 18.769 19.615 19.391   18.648 ~ 3 0
47 [ATA2011] 38 GlC 12 28 12.11 +44 05 39.2 18.350 18.970 17.68   16.63 ~ 4 0
48 [ATA2011] 45 Cl* 12 28 12.1135565304 +44 05 17.824408872 20.859 21.256 21.113   20.813 ~ 3 0
49 [GHG2001] 39 Cl* 12 28 12.14 +44 05 47.5           ~ 1 0
50 [ATA2011] 35 Cl* 12 28 12.37 +44 05 43.2 19.918 19.797 19.060   17.988 ~ 3 0
51 [GHG2001] 41 Cl* 12 28 12.51 +44 07 01.4           ~ 1 0
52 [ATA2011] 22 Cl* 12 28 12.9493438104 +44 06 23.093052768 21.070 21.257 21.055   20.633 ~ 4 0
53 [ATA2011] 23 Cl* 12 28 13.03 +44 06 12.0 17.811 18.848 18.845   18.446 ~ 3 0
54 [GHG2001] 44 Cl* 12 28 13.3043513088 +44 05 18.356193348 22.274 22.408 22.068   21.236 ~ 3 0
55 [GHG2001] 46 Cl* 12 28 13.51685 +44 06 59.5404 20.309 21.847 21.999   22.327 ~ 2 0
56 [GHG2001] 45 Cl* 12 28 13.55347 +44 07 03.2895 18.980 20.396 20.536   20.804 ~ 2 0
57 [GHG2001] 47 GlC 12 28 13.9522849608 +44 06 42.881267556 18.940 18.965 18.678   18.134 ~ 10 0
58 [GHG2001] 48 GlC 12 28 14.5610081760 +44 05 00.116494224 20.804 20.733 19.985   18.907 ~ 5 0
59 [ATA2011] 13 Cl* 12 28 14.8636234056 +44 06 41.057093844 19.371 20.917 21.105   21.343 ~ 3 0
60 [GHG2001] 50 Cl* 12 28 15.43 +44 06 34.1           ~ 1 0
61 [GHG2001] 51 Cl* 12 28 15.8432340384 +44 06 43.221449088   21.54 20.22   20.84 ~ 2 0
62 [ATA2011] 12 Cl* 12 28 16.0108144320 +44 06 29.262962088 19.345 20.671 18.990   19.799 ~ 3 0
63 [GHG2001] 53 GlC 12 28 16.5468886080 +44 05 36.244259412 21.421 21.280 20.585   19.632 ~ 5 0
64 [ATA2011] 15 GlC 12 28 16.6515541200 +44 06 11.850364296 20.953 21.235 21.051   20.556 ~ 4 0
65 [GHG2001] 55 Cl* 12 28 16.68 +44 05 38.2           ~ 1 0
66 [GHG2001] 56 Cl* 12 28 17.34 +44 06 01.4           ~ 1 0
67 [ATA2011] 17 GlC 12 28 17.51 +44 05 57.8 20.457 19.89 20.625   20.317 ~ 4 0
68 [ATA2011] 11 GlC 12 28 17.54 +44 06 10.4 21.439 22.001 21.871   21.587 ~ 4 0
69 [GHG2001] 59 GlC 12 28 18.7466881152 +44 06 22.735044144 21.299 21.238 20.543   19.602 ~ 5 0
70 [ATA2011] 20 GlC 12 28 18.7801081176 +44 05 19.307601060 23.036 20.53 19.75   18.62 ~ 6 0
71 [ATA2011] 19 GlC 12 28 19.19 +44 05 32.0 23.267 23.061 22.210   21.037 ~ 4 0
72 * bet CVn ** 12 33 44.5442516547 +41 21 26.921352859 4.91 4.86 4.25 3.73 3.42 G0V 613 0
73 * 9 CVn * 12 38 46.2769175928 +40 52 28.787416500   6.547 6.352     A6Vp_lB 51 0
74 * 26 Com SB* 12 39 07.3025867784 +21 03 45.300179376   6.46 5.49     G9IIIb 70 0
75 * 30 Com ** 12 49 17.4507551424 +27 33 08.563249188 5.87 5.81 5.78   5.70 A1Van 85 0
76 * 31 Com Ro* 12 51 41.9201696640 +27 32 26.565016812 5.81 5.61 4.94 4.39 4.04 G0IIIp 443 1
77 * eps Vir PM* 13 02 10.5970152536 +10 57 32.935398266 4.45 3.71 2.79 2.16 1.71 G8III-IIIb 574 0
78 * mu. Cep s*r 21 43 30.4595558543 +58 46 48.165937434 8.85 6.43 4.08 1.98 0.22 M2-Ia 695 1
79 V* V424 Lac s*r 22 56 25.9983901008 +49 44 00.758688324 8.66 6.71 4.94 3.59 2.54 K5Ib 166 0

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