J/ApJS/266/36 Open star clusters within 5kpc in Gaia DR3 (Chi+, 2023)
Blind search of the solar neighborhood Galactic disk within 5kpc: 1179 new star
clusters found in Gaia DR3.
Chi H., Wang F., Wang W., Deng H., Li Z.
<Astrophys. J. Suppl. Ser., 266, 36 (2023)>
=2023ApJS..266...36C 2023ApJS..266...36C
ADC_Keywords: Clusters, open; Radial velocities; Proper motions;
Parallaxes, trigonometric; Photometry; Surveys; Optical
Keywords: Open star clusters ; Star clusters
Abstract:
Studying open clusters (OCs) may help to provide a comprehensive
understanding of the structure and evolution of the Milky Way. Many
previous studies have systematically searched for OCs near the solar
system within 1.2kpc or 20° of Galactic latitude. However, few
studies have searched for OCs at higher Galactic latitudes and deeper
distances. In this study, based on a hybrid unsupervised clustering
algorithm (friends-of-friends and pyUPMASK) and a binary
classification algorithm (random forest), we extended the search
region (i.e., Galactic latitude |b|≥20°) and performed a
fine-grained blind search for Galactic clusters in Gaia DR3. After
crossmatching, the newly discovered cluster candidates are fitted
using isochrone fitting to estimate the main physical parameters
(i.e., age and metallicity) of these clusters. These cluster
candidates were then checked using manual visual inspection. Their
statistical properties were also compared with previously exposed
cluster catalogs. We found 1179 new clusters with considerable
confidence within 5kpc.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 171 1179 Catalog of star cluster properties
table5.dat 144 59978 Catalog of cluster members
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See also:
B/ocl : Optically visible open clusters and Candidates (Dias+ 2002-2015)
I/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022)
J/A+A/558/A53 : MW global survey of star clusters. II. (Kharchenko+, 2013)
J/A+A/618/A93 : Gaia DR2 open clusters in the MW (Cantat-Gaudin+, 2018)
J/A+A/618/A59 : Gaia DR2 nearby open clusters (Castro-Ginard+, 2018)
J/AJ/156/121 : 518 likely open cluster NGC 6405 members (Gao, 2018)
J/A+A/619/A155 : Open cluster kinematics with Gaia DR2 (Soubiran+, 2018)
J/AJ/157/12 : Star clusters, assoc. & candidates in the MW (Bica+, 2019)
J/A+A/623/A108 : Age of 269 GDR2 open clusters (Bossini+, 2019)
J/A+A/624/A126 : Open clusters in Perseus direction (Cantat-Gaudin+, 2019)
J/A+A/623/A80 : Open clusters in APOGEE and GALAH surveys (Carrera+, 2019)
J/A+A/627/A35 : Open clusters in Gal. anti-centre (Castro-Ginard+, 2019)
J/MNRAS/483/5508 : Three new Galactic star clusters (Ferreira+, 2019)
J/ApJS/245/32 : Newly identified star clusters in Gaia DR2 (Liu+, 2019)
J/A+A/633/A99 : Gaia DR2 open clusters in the MW. II (Cantat-Gaudin+, 2020)
J/A+A/640/A1 : Portrait Galactic disc (Cantat-Gaudin+, 2020)
J/A+A/635/A45 : Open clusters in the Galactic disc (Castro-Ginard+, 2020)
J/MNRAS/496/2021 : New Galactic open clusters (Ferreira+, 2020)
J/MNRAS/504/356 : Updated parameters of 1743 open clusters (Dias+, 2021)
J/MNRAS/502/L90 : Gaia DR2 Galactic bulge new star clusters (Ferreira+, 2021)
J/A+A/652/A102 : 3794 open clusters parameters (Hao+, 2021)
J/other/RAA/21.93 : 74 new open clusters found in Gaia DR2 (He+, 2021)
J/A+A/646/A104 : Improving the open cluster census. I. (Hunt+, 2021)
J/ApJ/923/129 : Membership for open clusters with Gaia DR2 (Jaehnig+, 2021)
J/MNRAS/505/5978 : Gaia EDR3 view on Gal. globular clusters (Vasiliev+, 2021)
J/A+A/661/A118 : Open clusters found with OCfinder (Castro-Ginard+, 2022)
J/A+A/660/A4 : Gaia EDR3 new Galactic open clusters (Hao+, 2022)
J/ApJS/260/8 : 541 new open cluster candidates (He+, 2022)
J/ApJS/262/7 : 886 nearby star clusters (He+, 2022)
J/ApJS/259/19 : LISC cat. of star clusters. I. Gaia (Li+, 2022)
J/A+A/659/A59 : Structural param. of local open clusters (Tarricq+, 2022)
J/AJ/164/54 : Gaia structural param. of 256 open clusters (Zhong+, 2022)
J/ApJS/265/20 : Reliable open cluster cand. from Gaia EDR3 (Chi+, 2023)
J/ApJS/264/8 : 1656 new CWNU star clusters (He+, 2023)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 5 I5 --- ClID [41/14698] Cluster id in this work
7- 10 I4 --- Nmem [20/1032] Number of star members
12- 19 F8.4 deg RAdeg Mean right ascension of members
(ICRS at Epoch=2016) (1)
21- 26 F6.4 deg e_RAdeg [0.0003/1.8] Standard deviation of right
ascension
28- 35 F8.4 deg DEdeg [-76.5/85.3] Mean declination of members
(ICRS at Epoch=2016) (1)
37- 42 F6.4 deg e_DEdeg [0.0002/1.3] Standard deviation of
declination of members
44- 49 F6.4 deg GLON [0.2/6.8] Mean Galactic longitude of members
51- 56 F6.4 deg e_GLON [0/0.02] Standard deviation of Galactic
longitude
58- 65 F8.4 deg GLAT [-24.4/18.8] Mean Galactic latitude of
members of members
67- 72 F6.4 deg e_GLAT [0.004/0.7] Standard deviation of Galactic
latitude of members
74- 81 F8.4 mas plx [-27.6/13.2] Mean parallax of members (1)
83- 88 F6.4 mas e_plx [0.002/0.8] Standard deviation of parallax (1)
90- 97 F8.4 mas/yr pmRA [-79.2/355] Mean proper motion in right
ascension of members (1)
99- 108 F10.4 mas/yr e_pmRA [0.0001/18370] Standard deviation of proper
motion in right ascension (1)
110- 117 F8.4 mas/yr pmDE [-68.4/85.3] Mean proper motion in
declination of members (1)
119- 124 F6.4 mas/yr e_pmDE [0.0001/0.4] Standard deviation of proper
motion in declination (1)
126- 128 I3 --- n17 [6/861] Numbers of members less than 17
magnitude
130- 134 F5.2 [Sun] Z [-0.88/0.44] Cluster metallicity determined
by the isochrone fit
136- 139 F4.2 [yr] logAge [5/8.8] Cluster age, log, determined by the
isochrone fit
141- 143 I3 --- Nrv [0/510] Number of radial velocity members
145- 153 F9.4 km/s RVelavg [-163.5/169.4]? Mean radial velocity of
members
155- 162 F8.4 km/s RVelstd [0.3/272.1]? Standard deviation of radial
velocity
164- 171 F8.4 km/s RVelMed [0/192.5]? Median value of radial velocity
dispersion of members (2)
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Note (1): Mean values based on Gaia DR3 data.
Note (2): If only one RV exists, the corresponding RVelMed value is 0.
If no RV exists, the corresponding RVelMed value is blank (null).
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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- 5 I5 --- Seq [0/59977] Sequential object identifier
7- 25 I19 --- Gaia Gaia DR3 source id (source_id)
27- 34 F8.4 deg RAdeg Right Ascension (ICRS) at Epoch=2016.0
36- 43 F8.4 deg DEdeg [-77.1/86] Declination (ICRS) at Epoch=2016.0
45- 51 F7.3 mas/yr pmRA [-25.7/20.1] Gaia DR3 proper motion in right
ascension
53- 59 F7.3 mas/yr pmDE [-28.6/14] Gaia DR3 proper motion in
declination
61- 65 F5.3 mas plx [0.2/7] Gaia DR3 parallax
67- 72 F6.3 mag Gmag [2.8/18] Gaia DR3 G-band magnitude
74- 79 F6.3 mag BPmag [4/21.8] Gaia DR3 BP-band magnitude
81- 86 F6.3 mag RPmag [2.2/17.6] Gaia DR3 RP-band magnitude
88- 95 F8.3 km/s RVel [-295.4/362]? Gaia DR3 Radial Velocity
97- 101 F5.3 deg e_RAdeg [0.005/0.5] Uncertainty in RAdeg
103- 107 F5.3 deg e_DEdeg [0.006/0.5] Uncertainty in DEdeg
109- 113 F5.3 mas/yr e_pmRA [0.005/0.7] Uncertainty in pmRA
115- 119 F5.3 mas/yr e_pmDE [0.008/0.7] Uncertainty in pmDE
121- 125 F5.3 mas e_plx [0.008/0.6] Uncertainty in plx
127- 132 F6.3 km/s e_RVel [0.1/40]? Uncertainty in RVel
134- 138 F5.2 --- PMm [-1/1] Membership probability (1)
140- 144 I5 --- ClID [41/14698] Cluster ID (from Table 3)
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Note (1): The membership probability of stars is iteratively calculated by:
Pstart=KDEm/(KDEm+KDEnm)
where Pstar, KDEm, and KDEnm are the membership probability of
the star, KDE of the members, and field star, respectively.
Cut stars with membership probability p<0.5 is an optimal threshold to
reduce the contamination of field stars.
See Section 3.2.
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History:
From electronic version of the journal
References:
Chi et al. Paper I. 2023ApJS..265...20C 2023ApJS..265...20C
Chi et al. Paper II. 2023RAA....23f5008C 2023RAA....23f5008C
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 10-Aug-2023