J/ApJ/802/127 PHAT stellar cluster survey. II. AP catalog (Johnson+, 2015)
PHAT stellar cluster survey.
II. Andromeda Project cluster catalog.
Johnson L.C., Seth A.C., Dalcanton J.J., Wallace M.L., Simpson R.J.,
Lintott C.J., Kapadia A., Skillman E.D., Caldwell N., Fouesneau M.,
Weisz D.R., Williams B.F., Beerman L.C., Gouliermis D.A., Sarajedini A.
<Astrophys. J., 802, 127 (2015)>
=2015ApJ...802..127J 2015ApJ...802..127J
ADC_Keywords: Galaxies, nearby ; Clusters, globular ; Surveys ; Photometry, HST
Keywords: catalogs ; galaxies: individual: M31; galaxies: star clusters: general
Abstract:
We construct a stellar cluster catalog for the Panchromatic Hubble
Andromeda Treasury (PHAT) survey using image classifications collected
from the Andromeda Project (AP) citizen science website. We identify
2753 clusters and 2270 background galaxies within ∼0.5deg2 of PHAT
imaging searched, or ∼400kpc2 in deprojected area at the distance of
the Andromeda Galaxy (M31). These identifications result from
1.82million classifications of ∼20000 individual images (totaling
∼7gigapixels) by tens of thousands of volunteers. We show that our
crowd-sourced approach, which collects >80 classifications per image,
provides a robust, repeatable method of cluster identification. The
high spatial resolution Hubble Space Telescope images resolve
individual stars in each cluster and are instrumental in the factor of
∼6 increase in the number of clusters known within the survey
footprint. We measure integrated photometry in six filter passbands,
ranging from the near-UV to the near-IR. PHAT clusters span a range of
∼8 magnitudes in F475W (g-band) luminosity, equivalent to ∼4 decades
in cluster mass. We perform catalog completeness analysis using >3000
synthetic cluster simulations to determine robust detection limits and
demonstrate that the catalog is 50% complete down to ∼500M☉ for
ages <100Myr. We include catalogs of clusters, background galaxies,
remaining unselected candidates, and synthetic cluster simulations,
making all information publicly available to the community. The
catalog published here serves as the definitive base data product for
PHAT cluster science, providing a census of star clusters in an L*
spiral galaxy with unmatched sensitivity and quality.
Description:
Each search image shown on the Andromeda Project (AP) site (see
section 2.1) was extracted from high-resolution (0.05"/pixel)
HST/Advanced Camera for Surveys (ACS) images of M31.
In addition to the optical (F475W, F814W; equivalent to g, I) ACS
images, PHAT also obtained near-UV (F275W, F336W; the latter is
equivalent to U) and near-IR (F110W, F160W; similar to J, H) imaging
using the HST/Wide Field Camera 3 (WFC3) instrument. Additional
information about PHAT imaging data and survey design is available in
Dalcanton et al. (2012ApJS..200...18D 2012ApJS..200...18D) and Paper I (Johnson+, 2012,
J/ApJ/752/95).
In addition to the PHAT data, we also processed and prepared ACS data
from the HST archive (PID: 10273; PI: Crotts) that covered portions of
M31 not imaged by PHAT (see Figure 2 and tables e1, e2, e3).
File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table2.dat 169 2753 Andromeda project (AP) cluster catalog
tableb1.dat 58 2270 Andromeda project (AP) background galaxy catalog
tablec1.dat 169 8775 Andromeda project (AP) ancillary catalog
(sources with fcl+gal≥0.1 not in AP catalogs)
tablec2.dat 114 3100 Synthetic cluster results
tabled2.dat 27 90 RBC (Revised Bologna Catalog) flag revisions
and commentary
tablee1.dat 69 421 Archival (non-PHAT) AP cluster catalog
tablee2.dat 45 162 Archival (non-PHAT) AP background galaxy catalog
tablee3.dat 62 1430 Archival (non-PHAT) AP ancillary catalog
(sources with fcl+gal≥0.1 not in AP catalogs)
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See also:
B/ocl : Optically visible open clusters and Candidates (Dias+ 2002-2014)
V/143 : Revised Bologna Catalog (RBC) of M31 clusters, V.5 (Galleti+ 2012)
J/ApJS/215/9 : PHAT X. UV-IR photometry of M31 stars (Williams+, 2014)
J/MNRAS/435/2835 : Morphological types from Galaxy Zoo 2 (Willett+, 2013)
J/PASP/125/636 : Newly identified star clusters in M 31 (Krienke+, 2013)
J/ApJ/752/95 : PHAT stellar cluster survey. I. Year 1 (Johnson+, 2012)
J/ApJ/751/122 : Ages and masses for 920 LMC clusters (Popescu+, 2012)
J/A+A/529/A25 : Phot. of star clusters in 5 nearby gal. (Silva-Villa+, 2011)
J/PASP/122/745 : HST WFPC2 star clusters in M31. III. (Hodge+, 2010)
J/AJ/138/1667 : HST survey of young clusters in M31. III. (Barmby+, 2009)
J/AJ/138/770 : HST/WFPC survey of M31 bright young clusters (Hodge+, 2009)
J/AJ/137/94 : Star clusters in M31 (Caldwell+, 2009)
J/PASP/120/1 : HST WFPC2 star clusters in M31. II. (Krienke+, 2008)
J/PASP/119/7 : HST WFPC2 star clusters in M31 (Krienke+, 2007)
J/A+A/416/917 : RBC of M31 globular clusters (Galleti+, 2004)
J/ApJ/559/851 : Young star cluster candidates in M31 (Williams+, 2001)
http://www.andromedaproject.org/ : Andromeda Project home page
Byte-by-byte Description of file: table2.dat tablec1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 5 I5 --- APID [1/54269] Andromeda Project Identification Number
7- 15 F9.6 deg RAdeg Right Ascension (J2000)
17- 25 F9.6 deg DEdeg Declination (J2000)
27- 31 F5.2 arcsec Rap [0.4/9.1] Aperture radius
33- 37 F5.2 arcsec Reff [-0.04/5.2]? Effective radius
39- 44 F6.4 --- fcl+g [0/1] Unweighted Cluster+Galaxy click fraction
(fclst+gal)
46- 51 F6.4 --- fg [0/1] Galaxy click fraction (fgal)
53- 58 F6.4 --- fclW [0/1] Weighted cluster click fraction (fclst,W)
60- 63 I4 --- PCID [1/1728]? ID number in Year-1 PHAT (J/ApJ/752/95)
65- 82 A18 --- AltID Alternate Name if any
84 A1 --- f_APID [EB]? Extended or Bulge source (1)
87- 91 F5.2 mag mcor [-0.8/-0]? Aperture correction (2)
93- 93 A1 --- l_F275W [>] F275W 3σ Upper limit flag
94- 98 F5.2 mag F275W [14/28]? HST/WFC3 F275W aperture magnitude
100-104 F5.2 mag e_F275W [0/0.7]? F275W error
106-106 A1 --- l_F336W [>] F336W 3σ Upper limit flag
107-111 F5.2 mag F336W [12.4/27.3]? HST/WFC3 F336W aperture magnitude
113-117 F5.2 mag e_F336W [0/1]? F336W error
119-119 A1 --- l_F475W [>] F475W 3σ Upper limit flag
120-124 F5.2 mag F475W [11.2/26.6]? HST/ACS F475W aperture magnitude
126-130 F5.2 mag e_F475W [0/0.4]? F475W error
132-132 A1 --- l_F814W [>] F814W 3σ Upper limit flag
133-137 F5.2 mag F814W [9.2/24.4]? HST/ACS F814W aperture magnitude
139-143 F5.2 mag e_F814W [0/0.4]? F814W error
145-145 A1 --- l_F110W [>] F110W 3σ Upper limit flag
146-150 F5.2 mag F110W [12.2/24.4]? HST/WFC3 F110W aperture magnitude
152-156 F5.2 mag e_F110W [0/0.4]? F110W error
158-158 A1 --- l_F160W [>] F160W 3σ Upper limit flag
159-163 F5.2 mag F160W [7.7/23.5]? HST/WFC3 F160W aperture magnitude
165-169 F5.2 mag e_F160W [0/0.4]? F160W error
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Note (1): Flag as follows:
E = Extended object (see section 6.2; 64 sources)
B = Bulge or B03 ("brick" number on Figure 2) object manually
added (see Section 5.1; 39 sources).
Note (2): Aperture corrections are provided such that
mTotal=mAperture+mcor
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Byte-by-byte Description of file: tableb1.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 5 I5 --- APID [8/6068] Andromeda Project Identification Number
7- 15 F9.6 deg RAdeg Right Ascension (J2000)
17- 25 F9.6 deg DEdeg Declination (J2000)
27- 31 F5.2 arcsec Rap [0.6/13] Aperture radius
33- 38 F6.4 --- fcl+g [0.3/1] Unweighted Cluster+Galaxy click fraction
40- 45 F6.4 --- fg [0.3/1] Galaxy click fraction
47- 47 A1 --- l_F814W F814W Upper limit flag
48- 52 F5.2 mag F814W [15.5/24]? HST/ACS F814W aperture magnitude
54- 58 F5.2 mag e_F814W [0.01/0.4]? F814W error
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Byte-by-byte Description of file: tablec2.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 5 I5 --- ID [1/3100] Synthetic cluster Identification Number
7- 11 F5.2 [Msun] logM [2/5] Logarithm of input Mass
13- 17 F5.2 [yr] logAge [6.6/10.1] Logarithm of input Age
19- 23 F5.3 --- Z [0/0.02] Input Metallicity
25- 29 F5.3 mag Av [0.1/3] Input V-band Attenuation
31- 35 F5.3 arcsec Reff [0.1/2.4] Input Effective radius
37- 41 F5.2 mag F475W [18.5/23] Input F475W
43- 47 F5.2 mag F814W [15.9/22.4] Input F814W
49- 53 F5.2 mag F475W-3 [18.5/27.3] Input F475W-3 (1)
55- 63 F9.6 deg RAdeg Right Ascension (J2000)
65- 73 F9.6 deg DEdeg Declination (J2000)
75- 79 F5.2 arcsec Rap [0.4/6]? Aperture radius
81- 86 F6.4 --- fcl+g [0/1]? Unweighted Cluster+Galaxy click fraction
88- 93 F6.4 --- fg [0/1]? Galaxy click fraction
95-100 F6.4 --- fclW [0/1]? Weighted cluster click fraction
102-106 I5 --- NMS [12/1566] Local Main Sequence star count
108-112 I5 --- NRGB [47/1296] Local Red Giant Branch star count
114-114 A1 --- Det? [TF] Detection flag: True or False
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Note (1): F475W-3 represents the the cluster flux after subtracting the
contribution of the cluster's three most luminous members
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Byte-by-byte Description of file: tabled2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 5 I5 --- APID [55/17335] Andromeda Project Identification Number
7- 21 A15 --- RBCID Revised Bologna Catalog name (Galleti+, V/143)
23- 24 I2 --- Cl1 [1/6] New RBC classification flag (1)
26- 27 I2 --- Cl0 [1/6] Old RBC classification flag (1)
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Note (1): Classification number as follows:
1 = globular cluster;
2 = candidate globular cluster;
3 = controversial object;
4 = galaxy;
5 = HII region
6 = star
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Byte-by-byte Description of file: tablee[123].dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 5 I5 --- AAPID [1/2041] Archival Andromeda Project
Identification Number
7- 15 F9.6 deg RAdeg Right Ascension (J2000)
17- 25 F9.6 deg DEdeg Declination (J2000)
27- 31 F5.2 arcsec Rap [0.6/15.8] Aperture radius
33- 38 F6.4 --- fcl+g [0/1] Unweighted Cluster+Galaxy click fraction
40- 45 F6.4 --- fg [0/1] Galaxy click fraction
47- 52 F6.4 --- fclW [0/1]? Weighted Cluster click fraction fclst,W
(not in tablee2)
54- 69 A16 --- AltID Alternate names (none in tablee2)
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History:
From electronic version of the journal
References:
Johnson et al. Paper I. 2012ApJ...752...95J 2012ApJ...752...95J Cat. J/ApJ/752/95
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 24-Jul-2015