2013A&A...551L..13G


C.D.S. - SIMBAD4 rel 1.7 - 2020.05.27CEST18:46:05

2013A&A...551L..13G - Astronomy and Astrophysics, volume 551, L13-13 (2013/3-1)

Mortality and dust expulsion in early phases of stellar clusters. Evidence from NIR photometry of nearby, spiral galaxies.

GROSBOL P. and DOTTORI H.

Abstract (from CDS):

It is often argued that young stellar clusters suffer a significant infant mortality that is partly related to the expulsion of dust and gas in their early phases caused by radiation pressure from hot stars and supernovae. Near-infrared (J-K)-MK diagrams of young stellar clusters in nearby spiral galaxies show a bi-modal distribution that is consistent with a fast decline of their intrinsic extinction at an early epoch. The distinct features in the color-magnitude diagrams (CMD) and the fast change of colors for the youngest clusters allow us to place constraints on their early evolutionary phases, including the time scale for the decreasing extinction caused for instance by gas and dust expulsion. Monte Carlo simulations of cluster populations were performed using the power-law distribution function g(M,τ)∝Mαγ. Integrated colors were computed from Starburst99 models. The simulated near-infrared CMD were compared with those observed for six grand-design, spiral galaxies using statistical goodness-of-fit tests. The CMDs indicate a significant mortality of young, massive clusters with γ=-1.4±0.5. High initial extinction AV=8-11m and strong nebular emission are required to reproduce the bi-modal color distributions of the clusters. An extended star formation phase of longer than 5Myr is suggested. The reduction of the internal extinction of the clusters starts during their active star formation and lasts for a period of 5-10Myr.

Abstract Copyright:

Journal keyword(s): stars: formation - galaxies: star clusters: general - galaxies: spiral - methods: statistical - infrared: general

Status at CDS:  

Simbad objects: 9

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Number of rows : 9

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 157 EmG 00 34 46.751 -08 23 47.36   11.0 19.00 10.03 10.7 ~ 324 0
2 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9383 1
3 NGC 1232 EmG 03 09 45.514 -20 34 45.48   10.67 9.87 9.53 10.2 ~ 261 0
4 NGC 1365 Sy1 03 33 36.458 -36 08 26.37 10.48 10.08 9.63 8.79 9.7 ~ 1512 2
5 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 14745 1
6 NGC 2997 GiG 09 45 38.7537949543 -31 11 27.357027761   9.97 9.41 8.84 9.9 ~ 377 0
7 M 51 GiP 13 29 52.698 +47 11 42.93   9.26 8.36 8.40   ~ 3763 4
8 NGC 5247 GiG 13 38 03.0179394007 -17 53 02.635368748   10.77   9.96 10.5 ~ 201 0
9 NGC 7424 GiG 22 57 18.3921716643 -41 04 14.121758456   10.88 10.38 10.02 10.9 ~ 192 0

    Equat.    Gal    SGal    Ecl

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2020.05.27-18:46:05

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