2009A&A...494..539L


Query : 2009A&A...494..539L

2009A&A...494..539L - Astronomy and Astrophysics, volume 494, 539-551 (2009/2-1)

The mass function of young star clusters in spiral galaxies.

LARSEN S.S.

Abstract (from CDS):

The initial cluster mass function (ICMF) in spiral discs is constrained and compared with data for old globular clusters and young clusters in starbursts. For a given absolute magnitude, the cluster age distribution depends on the ICMF. Here, the behaviour of the median age-magnitude relation is analysed in detail for Schechter ICMFs with various cut-off masses, Mc. The calculated relations are compared with observations of the brightest clusters in spiral galaxies. Schechter functions are also fitted directly to observed mass functions (MFs).A single Schechter ICMF with an Mc of a few times 105M can reproduce the observed ages and luminosities of the brightest (and 5th brightest) clusters in the spirals if disruption of optically visible clusters is dominated by relatively slow secular evolution. A Schechter function fit to the combined cluster MF for all spirals in the sample yields Mc=(2.1±0.4)x105M. The MFs in cluster-poor and cluster-rich spirals are statistically indistinguishable. An Mc=2.1x105M Schechter function also fits the MF of young clusters in the Large Magellanic Cloud. If the same ICMF applies in the Milky Way, a bound cluster with M>105M will form about once every 107years, while an M>106M cluster will form only once every 50Gyr. Luminosity functions (LFs) of model cluster populations drawn from an Mc=2.1x105M Schechter ICMF generally agree with LFs observed in spiral galaxies. The ICMF in present-day spiral discs can be modelled as a Schechter function with Mc≃2x105M. However, the presence of significant numbers of M>106M (and even M>107M) clusters in some starburst galaxies makes it unlikely that the Mc value derived for spirals is universal. In high-pressure environments, such as those created by complex gas kinematics and feedback in mergers, Mc can shift to higher masses than in quiescent discs.

Abstract Copyright:

Journal keyword(s): Galaxy: open clusters and associations: general - galaxies: star clusters - galaxies: spiral

Errata: erratum vol. 503, p. 467 (2009)

Simbad objects: 42

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Number of rows : 42
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 NGC 45 LSB 00 14 04.0072128696 -23 10 55.132646808 11.92 11.21 10.73 10.58 10.4 ~ 244 1
2 NGC 247 LSB 00 47 08.554 -20 45 37.44 10.11 9.61 9.10 8.87   ~ 416 2
3 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 10592 1
4 NGC 300 GiG 00 54 53.4465638304 -37 41 03.168402396 8.83 8.69 8.13 7.46   ~ 1445 2
5 M 74 G 01 36 41.7451236624 +15 47 01.107512304 10.52 10.00 9.46 9.16   ~ 1645 1
6 NGC 1156 rG 02 59 42.8528847264 +25 14 28.352017320 12.13 12.32 11.74     ~ 299 1
7 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 6618 1
8 NGC 1313 G 03 18 16.046 -66 29 53.74   10.06 10.0 9.40 10.4 ~ 665 2
9 NGC 1316 GiP 03 22 41.789 -37 12 29.52 9.81 9.15 8.53 7.66   ~ 1331 1
10 NGC 1569 IG 04 30 49.186 +64 50 52.52 11.72 11.86 11.03     ~ 1212 3
11 NGC 1705 SBG 04 54 13.4661493464 -53 21 39.471592428 12.32 12.96 12.56 12.58 12.9 ~ 633 1
12 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 16619 1
13 NGC 2403 AGN 07 36 51.3381434280 +65 36 09.650825640 9.31 8.84 8.38 8.19   ~ 1727 1
14 NGC 2835 EmG 09 17 52.8523921416 -22 21 16.839119700   11.03   10.32 10.9 ~ 217 0
15 NGC 2997 GiG 09 45 38.7542237472 -31 11 27.345810192   9.97 9.41 8.84 9.9 ~ 405 0
16 M 82 IG 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 5698 6
17 NGC 3180 GiG 10 18 16.985 +41 25 27.77   10.4       ~ 699 0
18 NGC 3521 LSB 11 05 48.5680991376 -00 02 09.245076540 10.06 9.83 9.02 10.1 9.6 ~ 776 2
19 NGC 3621 AGN 11 18 16.300 -32 48 45.36 10.10 9.44 9.56 8.07 10.1 ~ 555 3
20 M 66 GiP 11 20 15.026 +12 59 28.64 9.85 9.65 8.92     ~ 1309 4
21 NGC 4038 GiP 12 01 53.002 -18 52 03.32   10.91   9.74 11.0 ~ 1314 1
22 NAME Antennae IG 12 01 53.170 -18 52 37.92           ~ 1658 0
23 NGC 4039 GiP 12 01 53.8 -18 53 06   11.08   9.77   ~ 1152 1
24 NGC 4228 SBG 12 15 39.174 +36 19 36.80 10.63 10.30 9.93 9.74   ~ 932 1
25 M 106 Sy2 12 18 57.620 +47 18 13.39   9.14 8.41 8.11   ~ 2281 3
26 NGC 4395 Sy2 12 25 48.8633109888 +33 32 48.700168152 10.84 10.54 10.11 9.98   ~ 1115 1
27 NGC 4449 EmG 12 28 11.118 +44 05 36.81 10.11 9.98 9.64 9.45   ~ 1091 1
28 M 104 LIN 12 39 59.43185902 -11 37 22.9961800 9.51 9.55 8.00 8.05   ~ 1357 3
29 M 63 LIN 13 15 49.2741893928 +42 01 45.728076108   9.34 8.59 8.35   ~ 1174 2
30 NGC 5204 LSB 13 29 36.508 +58 25 07.43   11.84   11.37   ~ 452 0
31 M 51 GiP 13 29 52.698 +47 11 42.93   9.26 8.36 8.40   ~ 4188 4
32 NGC 5195 GiP 13 29 59.590 +47 15 58.06 10.76 10.45 9.55 9.31   ~ 753 3
33 M 83 SBG 13 37 00.91920 -29 51 56.7400 8.85 8.11 7.52 7.21   ~ 2469 2
34 NGC 5585 GiG 14 19 48.204 +56 43 44.58   11.73 11.216 11.12 10.123 ~ 410 0
35 IC 4553 SyG 15 34 57.22396 +23 30 11.6084   14.76 13.88     ~ 2882 4
36 NGC 6744 GiG 19 09 46.1335950504 -63 51 26.897079024   9.28 8.25 8.08 9.6 ~ 261 0
37 NGC 6946 H2G 20 34 52.332 +60 09 13.24   10.5       ~ 2437 2
38 [WSL93] 3 GlC 22 20 43.878 -24 40 37.87     17.86     ~ 52 0
39 NGC 7252 IG 22 20 44.7748209648 -24 40 41.909518200 12.26 12.46 12.06 11.57   ~ 689 1
40 NGC 7424 GiG 22 57 18.3924511080 -41 04 14.124670032   10.88 10.38 10.02 10.9 ~ 211 0
41 NGC 7793 GiG 23 57 49.7540045856 -32 35 27.701550744 10.26 9.74 9.28 9.06 9.7 ~ 1062 2
42 NAME Local Group GrG ~ ~           ~ 7964 0

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2023.03.21-12:24:39

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