2005ApJ...621..278M

Query : 2005ApJ...621..278M

2005ApJ...621..278M - Astrophys. J., 621, 278-284 (2005/March-1)

Mass segregation and the initial mass function of super star cluster M82-F.

McCRADY N., GRAHAM J.R. and VACCA W.D.

Abstract (from CDS):

We investigate the initial mass function and mass segregation in super star cluster M82-F with high-resolution Keck NIRSPEC echelle spectroscopy. Cross-correlation with template supergiant spectra provides the velocity dispersion of the cluster, enabling measurement of the kinematic (virial) mass of the cluster when combined with sizes from NICMOS and Advanced Camera for Surveys (ACS) images. We find a mass of 6.6±0.9x105M☉based on near-IR light and 7.0±1.2x105M☉based on optical light. Using PSF-fitting photometry, we derive the cluster's light-to-mass (L/M) ratio in both near-IR and optical light and compare to population-synthesis models. The ratios are inconsistent with a normal stellar initial mass function for the adopted age of 40-60 Myr, suggesting a deficiency of low-mass stars within the volume sampled. King model light profile fits to new Hubble Space Telescope ACS images of M82-F, in combination with fits to archival near-IR images, indicate mass segregation in the cluster. As a result, the virial mass represents a lower limit on the mass of the cluster.

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Journal keyword(s): Galaxies: Individual: Messier Number: M82 - Galaxies: Star Clusters - Galaxies: Starburst - Infrared: Galaxies

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 - 2026 		#notes
1 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
2 NGC 330 Cl* 00 56 18.55 -72 27 45.1 9.37 9.76 9.55   8.89 ~ 445 0
3 HD 268850 AB* 05 02 21.4730341272 -66 06 38.294439372   11.83 11.55 12.43   ~ 89 0
4 NGC 1805 GlC 05 02 21.690 -66 06 39.43           ~ 115 0
5 NGC 1818 GlC 05 04 13.300 -66 26 05.47           ~ 279 0
6 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
7 NGC 2004 Cl* 05 30 41.340 -67 17 21.83   9.6       ~ 281 0
8 NAME 30 Dor Nebula SFR 05 38 36.0 -69 05 11           ~ 1276 2
9 RMC 136 Cl* 05 38 42.396 -69 06 03.36   5.81 5.40     ~ 2236 2
10 NGC 2100 Cl* 05 42 07.200 -69 12 26.99           ~ 195 0
11 [SWG2006] F Cl* 09 55 47.08 +69 40 42.3   17.61 16.50   14.94 ~ 62 0
12 MGG 11 Cl* 09 55 50.2 +69 40 45           ~ 72 0
13 MGG 9 Cl* 09 55 50.5 +69 40 45           ~ 27 0
14 M 82 AGN 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 6156 6
15 NGC 4038 EmG 12 01 53.002 -18 52 03.32   10.91   9.74 11.0 ~ 1364 1
16 NAME Antennae IG 12 01 53.170 -18 52 37.92           ~ 1749 0
17 NGC 4039 GiP 12 01 53.51 -18 53 10.3   11.08   9.77   ~ 1173 1
18 HD 173087 ** 18 42 08.0883472656 +34 44 46.751348076   6.346 6.473     B5V 82 0

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