J/MNRAS/405/857 Star clusters in NGC 3256 (Goddard+, 2010)
On the fraction of star clusters surviving the embedded phase.
Goddard Q.E., Bastian N., Kennicutt R.C.
<Mon. Not. R. Astron. Soc., 405, 857-869 (2010)>
=2010MNRAS.405..857G 2010MNRAS.405..857G
ADC_Keywords: Galaxies, nearby ; Associations, stellar ; Photometry, HST
Keywords: stars: formation - galaxies: stellar content - galaxies: structure
Abstract:
In this paper we derive ages and masses for 276 clusters in the merger
galaxy NGC 3256. This was achieved by taking accurate photometry in
four wavebands from archival Hubble Space Telescope images.
Photometric measurements are compared to synthetic stellar population
(SSP) models to find the most probable age, mass and extinction. The
cluster population of NGC 3256 reveals an increase in the star
formation rate (SFR) over the last 100Myr and the initial cluster
mass function (ICMF) is best described by a power-law relation with
slope alpha=1.85±0.12.
Description:
We used archival HST Advanced Camera for Surveys (ACS) images of
NGC 3256 across four filters, F330W (PI: Holland Ford; ID: 9300),
F435W (PI: Alex Fillippenko; ID: 10272), F555W (ID: 9300) and F814W
(ID: 9300).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table5.dat 117 276 Cluster photometry and parameters for the
276 good cluster fits
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq [1/276] Sequential number
5- 9 F5.2 s oRA Offset in right ascension (1)
11- 15 F5.2 arcsec oDE Offset in declination (1)
17- 21 F5.2 mag Umag HST/HRC F330W (U) magnitude
24- 27 F4.2 mag e_Umag rms uncertainty in Umag
29- 33 F5.2 mag Bmag HST/ACS F435W (B) magnitude
36- 39 F4.2 mag e_Bmag rms uncertainty in Bmag
41- 45 F5.2 mag Vmag HST/ACS F555W (V) magnitude
48- 51 F4.2 mag e_Vmag rms uncertainty in Vmag
53- 57 F5.2 mag Imag HST/ACS F814W (I) magnitude
60- 63 F4.2 mag e_Imag rms uncertainty in Imag
66- 69 F4.2 mag b_E(B-V) Mimimun acceptable E(B-V) dust extinction
from fitting method
72- 75 F4.2 mag E(B-V) Optimal E(B-V) dust extinction
from fitting method
78- 81 F4.2 mag B_E(B-V) Maximum acceptable E(B-V) dust extinction
from fitting method
84- 87 F4.2 [yr] --- Minimum acceptable age from fitting method
(identical to column B_logAge!)
90- 93 F4.2 [yr] logAge Optimal age from fitting method
96- 99 F4.2 [yr] B_logAge Maximum acceptable age from fitting method
102-105 F4.2 [Msun] b_Mass Minimum acceptable mass from fitting method
108-111 F4.2 [Msun] Mass Optimal mass from fitting method
114-117 F4.2 [Msun] B_Mass Maximum acceptable mass from fitting method
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Note (1): offsets from RA=10:20:00 and DE=-43:54:00 (J2000.0).
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 09-Dec-2010