2010A&A...516A..10S


C.D.S. - SIMBAD4 rel 1.7 - 2020.12.02CET10:51:02

2010A&A...516A..10S - Astronomy and Astrophysics, volume 516, A10-10 (2010/6-2)

The star cluster-field star connection in nearby spiral galaxies. I. Data analysis techniques and application to NGC 4395.

SILVA-VILLA E. and LARSEN S.S.

Abstract (from CDS):

It is generally assumed that a large fraction of stars are initially born in clusters. However, a large fraction of these disrupt on short timescales and the stars end up belonging to the field. Understanding this process is of paramount importance if we wish to constrain the star formation histories of external galaxies using star clusters. We attempt to understand the relation between field stars and star clusters by simultaneously studying both in a number of nearby galaxies. As a pilot study, we present results for the late-type spiral NGC 4395 using HST/ACS and HST/WFPC2 images. Different detection criteria were used to distinguish point sources (star candidates) and extended objects (star cluster candidates). Using a synthetic CMD method, we estimated the star formation history. Using simple stellar population model fitting, we calculated the mass and age of the cluster candidates. The field star formation rate appears to have been roughly constant, or to have possibly increased by up to about a factor of two, for ages younger than ∼300Myr within the fields covered by our data. Our data do not allow us to constrain the star formation histories at older ages. We identify a small number of clusters in both fields. Neither massive (>105M) clusters nor clusters with ages ≥1Gyr were found in the galaxy and we found few clusters older than 100 Myr. Based on our direct comparison of field stars and clusters in NGC 4395, we estimate the ratio of star formation rate in clusters that survive for 107 to 108 years to the total star formation to be Γ∼0.03. We suggest that this relatively low Γ value is caused by the low star formation rate of NGC 4395.

Abstract Copyright:

Journal keyword(s): galaxies: individual: NGC 4395 - galaxies: star clusters: general - galaxies: star formation - galaxies: photometry

Simbad objects: 18

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Number of rows : 18

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NGC 45 LSB 00 14 03.989 -23 10 55.53 11.92 11.21 10.73 10.58 10.4 ~ 228 1
2 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 11103 1
3 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9610 1
4 M 33 GiG 01 33 50.904 +30 39 35.79 6.17 6.27 5.72     ~ 5215 1
5 M 74 G 01 36 41.772 +15 47 00.46 10.52 10.00 9.46 9.16   ~ 1437 1
6 NAME Phoenix Dwarf Galaxy Sy1 01 51 06.3 -44 26 41   13.48 13.2 12.69   ~ 462 2
7 NGC 1313 G 03 18 16.046 -66 29 53.74   10.06 10.0 9.40 10.4 ~ 615 2
8 NGC 1705 SBG 04 54 13.500 -53 21 39.82 12.32 12.96 12.56 12.58 12.9 ~ 599 1
9 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 15062 1
10 M 81 Sy2 09 55 33.17306143 +69 03 55.0609270   7.89 6.94     ~ 4012 5
11 NAME Leo Dwarf Irregular Galaxy G 09 59 26.46 +30 44 47.0 14.08 13.54 13.26 13.33   ~ 552 0
12 NGC 4395 Sy2 12 25 48.8639154223 +33 32 48.694684028 10.84 10.54 10.11 9.98   ~ 1015 1
13 NAME Centaurus A Sy2 13 25 27.61509104 -43 01 08.8056025   8.18 6.84 6.66   ~ 4042 3
14 M 51 GiP 13 29 52.698 +47 11 42.93   9.26 8.36 8.40   ~ 3851 4
15 M 83 SBG 13 37 00.919 -29 51 56.74 8.85 8.11 7.52 7.21   ~ 2258 2
16 M 101 GiP 14 03 12.583 +54 20 55.50   8.46 7.86 7.76   ~ 2579 2
17 NGC 7793 GiG 23 57 49.7533807411 -32 35 27.708304655 10.26 9.74 9.28 9.06 9.7 ~ 940 2
18 NAME Local Group GrG ~ ~           ~ 7114 0

    Equat.    Gal    SGal    Ecl

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2020.12.02-10:51:02

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