J/ApJS/216/6 Opt-NIR HST photometry of cluster candidates in M82 (Li+, 2015)
Star cluster disruption in the starburst galaxy Messier 82.
Li S., de Grijs R., Anders P., Li C.
<Astrophys. J. Suppl. Ser., 216, 6 (2015)>
=2015ApJS..216....6L 2015ApJS..216....6L
ADC_Keywords: Galaxies, nearby ; Photometry, HST ; Clusters, open
Keywords: galaxies: evolution; galaxies: individual: M82;
galaxies: star clusters: general; galaxies: star formation;
globular clusters: general
Abstract:
Using high-resolution, multiple-passband Hubble Space Telescope images
spanning the entire optical/near-infrared wavelength range, we
obtained a statistically complete U-band-selected sample of 846
extended star clusters across the disk of the nearby starburst galaxy
M82 (NGC3034). Based on a careful analysis of the clusters' spectral
energy distributions, we determined their galaxy-wide age and mass
distributions. The M82 clusters exhibit three clear peaks in their age
distribution, thus defining relatively young, log(t/yr)≤7.5,
intermediate-age, log(t/yr)∈[7.5,8.5], and old samples,
log(t/yr)≥8.5. Comparison of the completeness-corrected mass
distributions offers a firm handle on the galaxy's star cluster
disruption history. The most massive star clusters in the young and
old samples are (almost) all concentrated in the most densely
populated central region, while the intermediate-age sample's most
massive clusters are more spatially dispersed, which may reflect the
distribution of the highest-density gas throughout the galaxy's
evolutionary history, combined with the solid-body nature of the
galaxy's central region.
Description:
The main data set we used was obtained as part of the M82 Hubble
Heritage Program (HST proposal GO-10776; PI: Mountain). In 2006 March,
the Hubble Heritage Team observed a large, four-color mosaic image of
M82 with the ACS/Wide Field Channel (WFC; pixel size ∼0.05") on board
the HST, through the F435W (B), F555W (V), F814W (I), and F658N
filters. A second data set, obtained with WFC3 (proposal GO-11360, PI:
O'Connell), employing the filters F336W (U), F110W (roughly equivalent
to a combination of the near-IR Y and J bands), and F160W (roughly
similar to the near-IR H band) has also been included.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 110 231 Photometry of the 231 M82 cluster candidates
detected in all of the UBVI(YJ)H passbands
table3.dat 128 846 Observed and derived properties of the UBVI-based
sample of candidate M82 clusters
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See also:
B/hst : HST Archived Exposures Catalog (STScI, 2007)
J/ApJ/766/20 : HST photometry of star clusters in M82 (Lim+, 2013)
J/A+A/532/A147 : HST phot. in extragalactic star clusters (Larsen+, 2011)
J/A+A/529/A25 : Phot. of star clusters in 5 nearby gal. (Silva-Villa+, 2011)
J/MNRAS/412/1539 : Ages of stars in dwarf galaxies (Bastian+, 2011)
J/ApJ/679/404 : Star clusters in M82 (Mayya+, 2008)
J/ApJ/667/L145 : HST Photometry of M82 region B (Smith+, 2007)
J/ApJ/619/270 : Young super star clusters in M82 (Melo+, 2005)
J/AJ/121/768 : BVIJH photometry of M82 (de Grijs+, 2001)
J/A+AS/139/393 : Young Massive Star Clusters. II. (Larsen, 1999)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 9 F9.5 deg RAdeg Right Ascension in decimal degrees (J2000)
11- 12 I2 h RAh [9] Hour of Right Ascension (J2000)
14- 15 I2 min RAm [55] Minute of Right Ascension (J2000)
17- 21 F5.2 s RAs [42/59] Second of Right Ascension (J2000)
23- 31 F9.6 deg DEdeg Declination in decimal degrees (J2000)
33 A1 --- DE- [+] Sign of Declination (J2000)
34- 35 I2 deg DEd [69] Degree of Declination (J2000)
37- 38 I2 arcmin DEm [40/41] Arcminute of Declination (J2000)
40- 44 F5.2 arcsec DEs Arcsecond of Declination (J2000)
46- 50 F5.2 mag F336W Integrated HST/WFC3 F336W (U) magnitude
52- 55 F4.2 mag e_F336W Uncertainty in F336W
57- 61 F5.2 mag F435W Integrated HST/ACS F435W (B) magnitude
63- 66 F4.2 mag e_F435W Uncertainty in F435W
68- 72 F5.2 mag F555W Integrated HST/ACS F555W (V) magnitude
74- 77 F4.2 mag e_F555W [0.1/1.8] Uncertainty in F555W
79- 83 F5.2 mag F814W Integrated HST/ACS F814W (I) magnitude
85- 88 F4.2 mag e_F814W Uncertainty in F814W
90- 94 F5.2 mag F110W Integrated HST/WFC3 F110W (YJ) magnitude
96- 99 F4.2 mag e_F110W Uncertainty in F110W
101-105 F5.2 mag F160W Integrated HST/WFC3 F160W (H) magnitude
107-110 F4.2 mag e_F160W [0.05/1.6] Uncertainty in F160W
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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- 9 F9.5 deg RAdeg Right Ascension in decimal degrees (J2000)
11- 12 I2 h RAh [9] Hour of Right Ascension (J2000)
14- 15 I2 min RAm [55/56] Minute of Right Ascension (J2000)
17- 21 F5.2 s RAs Second of Right Ascension (J2000)
23- 31 F9.6 deg DEdeg Declination in decimal degrees (J2000)
33 A1 --- DE- [+] Sign of Declination (J2000)
34- 35 I2 deg DEd [69] Degree of Declination (J2000)
37- 38 I2 arcmin DEm [39/42] Arcminute of Declination (J2000)
40- 44 F5.2 arcsec DEs Arcsecond of Declination (J2000)
46- 50 F5.2 mag F336W Integrated HST/WFC3 F336W magnitude
52- 55 F4.2 mag e_F336W Uncertainty in F336W
57- 61 F5.2 mag F435W Integrated HST/ACS F435W magnitude
63- 66 F4.2 mag e_F435W Uncertainty in F435W
68- 72 F5.2 mag F555W Integrated HST/ACS F555W magnitude
74- 77 F4.2 mag e_F555W Uncertainty in F555W
79- 83 F5.2 mag F814W Integrated HST/ACS F814W magnitude
85- 88 F4.2 mag e_F814W Uncertainty in F814W
90- 93 F4.2 [yr] Age [6.7/9.3] Log of the best age
95- 98 F4.2 [yr] e_Age Negative uncertainty in Age
100-103 F4.2 [yr] E_Age Positive uncertainty in Age
105-108 F4.2 [Msun] Mass [3.6/6.2] Log of the best mass
110-113 F4.2 [Msun] e_Mass Negative uncertainty in Mass
115-118 F4.2 [Msun] E_Mass Positive uncertainty in Mass
120-123 F4.2 mag E(B-V) [0/2.4] Reddening, E(B-V) (1)
125-128 F4.2 pc Rhl [0.6/4.3] Half-light radius (2)
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Note (1): Typical uncertainties in the total (foreground + internal)
extinction, E(B-V) are 0.05 to 0.10mag.
Note (2): Typical uncertainties in Rhl are 0.02 to 0.05pc.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 11-Feb-2015