J/AJ/122/3046 HST photometry of star clusters in NGC 5236 (Harris+, 2001)
Young clusters in the nuclear starburst of M83.
Harris J., Calzetti D., Gallagher III J.S., Conselice C.J., Smith D.A.
<Astron. J. 122, 3046 (2001)>
=2001AJ....122.3046H 2001AJ....122.3046H
ADC_Keywords: Galaxies, photometry ; Associations, stellar
Keywords: galaxies: starburst - galaxies: star clusters -
galaxies: individual (NGC 5236)
Description:
We present a photometric catalog of 45 massive star clusters in the
nuclear starburst of M83 (NGC 5236), observed with the Hubble Space
Telescope Wide Field Planetary Camera 2, in both broadband (F300W,
F547M, and F814W) and narrowband (F656N and F487N) filters, in two
separate visits one week apart during April and May 2000 .
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 83 45 Astrometry and photometry of clusters in NGC 5236
table3.dat 54 330 Objects not detected in F547M or F814W
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Cl Cluster number, [HCG2001] Cl* NN
3 A1 --- n_Cl [c] c: Probable anomalous cluster
4- 5 I2 h RAh Right ascension (J2000.0)
7- 8 I2 min RAm Right ascension (J2000.0)
10- 14 F5.2 s RAs Right ascension (J2000.0)
16 A1 --- DE- Declination sign (J2000.0)
17- 18 I2 deg DEd Declination (J2000.0)
20- 21 I2 arcmin DEm Declination (J2000.0)
23- 27 F5.2 arcsec DEs Declination (J2000.0)
29- 33 F5.2 mag F300W The F300W band magnitude
34 A1 --- f_F300W [f] multiple detection in F300Wmag (1)
35- 39 F5.2 mag F547M The F547M band magnitude
40 A1 --- f_F547M [f] multiple detection in F547Mmag (1)
41- 45 F5.2 mag F814W The F814W band magnitude
47- 50 I4 0.1nm EW(Ha) ? Hα equivalent width (2)
51 A1 --- f_EW(Ha) [g] limit value on EW(Ha) (3)
52- 55 I4 0.1nm EW(Ha)2 ? Second Hα equivalent width (2)
57- 60 F4.2 mag E(B-V) The E(B-V) colour excess
61 A1 --- f_E(B-V) [b] unreliable value of E(B-V) (4)
64- 67 F4.1 10+3solMass Mass Mass
68 A1 --- f_Mass [d] lower limit on Mass (5)
69- 72 I4 --- Massph ? Mass estimated from photometry
74- 78 F5.2 Myr Age Primary age
79 A1 --- f_Age [e] Age estimated from Hα line (6)
80- 83 F4.1 --- Ageph ? Primary age estimated from photometry
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Note (1): 'f' indicates that the cluster was split into two detections
in this filter. We flux-added the two detections to get the total
cluster flux.
Note (2): Values estimated by flux-adding all Hα peaks within
5 and 12 pixels of the cluster position.
In the three cases for which the two radii yield different
EW(Hα) values, both are presented.
Note (3): 'g' indicates that an upper limit to EW(Hα) was determined
from the cluster-centered aperture of peak-subtracted F656N image.
The age and mass estimates for this cluster are lower limits.
Note (4): 'b' indicates that no reliable extinction estimate could be
made from the Hα/Hβ map. We assume a reddening value
that makes the intrinsic cluster photometry consistent with a point
on the Starburst99 model.
Note (5): We cannot exclude a mixed gas and dust geometry for objects with
E(B-V)≳0.37mag. The mass presented is a lower limit, because it
assumes the intrinsic luminosity is not underestimated.
Note (6): 'e' indicates a cluster with anomalous photometry.
Age and mass estimates are from EW(Hα).
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Obj Identification number, [HCG2001] Obj NNN
5 A1 --- n_Obj [sc] Nature of obj (1)
7- 8 I2 h RAh Hour of Right Ascension (J2000)
10- 11 I2 min RAm Minute of Right Ascension (J2000)
13- 17 F5.2 s RAs Second of Right Ascension (J2000)
19 A1 --- DE- Sign of the Declination (J2000)
20- 21 I2 deg DEd Degree of Declination (J2000)
23- 24 I2 arcmin DEm Arcminute of Declination (J2000)
26- 30 F5.2 arcsec DEs Arcsecond of Declination (J2000)
32- 36 F5.2 mag F300Wmag The F300W band magnitude
38- 42 F5.2 mag F547Mmag ? The F547M band magnitude
44- 47 F4.2 mag E(B-V) The E(B-V) colour excess
49- 52 I4 0.1nm EWHa ? The Hα equivalent width in Angstroems
54 A1 --- f_EWHa [b] Flag on EWHa (2)
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Note (1): the note means the following:
c = Probable cluster
s = Probable individual star
Note (2): 'b' indicates an estimation from flux measured through an
11-pixel aperture in the peak-subtracted F656N image.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Bauer [CDS] 25-Feb-2002