J/MNRAS/516/1320 J-PLUS globular cluster cand. around M81 (Chies-Santos+, 2022)
J-PLUS: a catalogue of globular cluster candidates around the M81/M82/NGC3077
triplet of galaxies.
Chies-Santos A.L., de Souza R.S., Caso J.P., Ennis A.I, de Souza C.P.E.,
Barbosa R.S., Chen P., Cenarro A.J., Ederoclite A., Cristobal-Hornillos D.,
Hernandez-Monteagudo C., Lopez-Sanjuan C., Marin-Franch A., Moles M.,
Varela J., Vazquez Ramio H., Dupke R., Sodre L.Jr., Angulo R.E.
<Mon. Not. R. Astron. Soc. 516, 1320-1338 (2022)>
=2022MNRAS.516.1320C 2022MNRAS.516.1320C (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, nearby ; Clusters, globular ; Photometry, SDSS ; Optical
Keywords: methods: statistical - galaxies: groups: individual -
galaxies: star clusters: general -
galaxies: star clusters: individual - galaxies: stellar content -
Abstract:
Globular clusters (GCs) are proxies of the formation assemblies of
their host galaxies. However, few studies exist targeting GC systems
of spiral galaxies up to several effective radii. Through 12-band
Javalambre Photometric Local Universe Survey (J-PLUS) imaging, we
study the point sources around the M81/M82/NGC3077 triplet in search
of new GC candidates. We develop a tailored classification scheme to
search for GC candidates based on their similarity to known GCs via a
principal components analysis (PCA) projection. Our method accounts
for missing data and photometric errors. We report 642 new GC
candidates in a region of 3.5deg2 around the triplet, ranked
according to their Gaia astrometric proper motions when available. We
find tantalising evidence for an overdensity of GC candidate sources
forming a bridge connecting M81 and M82. Finally, the spatial
distribution of the GC candidates (g-i) colours is consistent with
halo/intra-cluster GCs, i.e. it gets bluer as they get further from
the closest galaxy in the field. We further employ a regression-tree
based model to estimate the metallicity distribution of the GC
candidates based on their J-PLUS bands. The metallicity distribution
of the sample candidates is broad and displays a bump towards the
metal-rich end. Our list increases the population of GC candidates
around the triplet by 3-fold, stresses the usefulness of multi-band
surveys in finding these objects, and provides a testbed for further
studies analysing their spatial distribution around nearby (spirals)
galaxies.
Description:
The J-PLUS data set consists of the processed images in the 12
available broad (u, g, r, i, and z) and narrow (J0378, J0395, J0410,
J0430, J0515, J0660, J0861) filters of the J-PLUS survey (Cenarro et
al., 2019A&A...622A.176C 2019A&A...622A.176C) for three pointings from the J-PLUS second
data release (DR2), downloaded from the J-PLUS collaboration website
(http://www.j-plus.es/datareleases/data_release_dr2) These pointings
cover the central region of the M 81 group, which contains the two
brightest galaxies in the group, M 81 and M 82, and they extend to the
South, including other less massive members like NGC 3077. The field
of view of each pointing is ∼2.1deg2, with a pixel scale of
0.55-arcsec. In this work, the analysis is limited to the region
spanning 148.4deg<RA<151.1deg and DE>68deg, which matches the HI
emission described in de Blok et al. (2018ApJ...865...26D 2018ApJ...865...26D), and spans
a total of ∼3.5deg2.
The file contains coordinates, magnitudes and magnitude errors in 12
J-PLUS bands as well as proper motions from GAIA EDR3.
File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
tablea1.dat 57 105 Spectroscopically confirmed GCs from the
literature in increasing order of right ascension
catalog.dat 189 641 J-PLUS DR2 M81 triplet globular cluster candidates
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See also:
https://www.j-plus.es/ancillarydata/dr2_M81_triplet_GC_candidates : Home Page
I/350 : Gaia EDR3 (Gaia Collaboration, 2020)
Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- Name Cluster name
14 A1 --- r_Name Reference for Name (1)
16- 17 I2 h RAh Right ascension (J2000)
19- 20 I2 min RAm Right ascension (J2000)
22- 25 F4.1 s RAs Right ascension (J2000)
27 A1 --- DE- Declination sign (J2000)
28- 29 I2 deg DEd Declination (J2000)
31- 32 I2 arcmin DEm Declination (J2000)
34- 37 F4.1 arcsec DEs Declination (J2000)
40- 45 F6.3 mag rmag ?=- J-PLUS r magnitude
47- 51 F5.3 mag g-i ?=- J-PLUS g-i colour index
53- 57 F5.2 [-] [Fe/H] ?=- Metallicity estimate
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Note (1): References as follows:
* = Perelmuter et al., 1995AJ....109.1055P 1995AJ....109.1055P, [PR95] NNNNN in Simbad
n = Nantais & Huchra, 2011AJ....142..183N 2011AJ....142..183N, Cat. J/AJ/142/183,
[NHZ2011] NNN in Simbad
a = Sharina et al., 2010MNRAS.405..839S 2010MNRAS.405..839S, Cat. J/MNRAS/405/839.
[SPM2005] HoIX-4-1038 in Simbad
d = Jang et al., 2012ApJ...751L..19J 2012ApJ...751L..19J,
GC-1 = SDSS J095326.22+693117.5
GC-2 = SDSS J095320.17+693916.3 .
+ = Lim et al., 2013ApJ...766...20L 2013ApJ...766...20L, Cat. J/ApJ/766/20,
[LHL2013] NNNN in Simbad
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Byte-by-byte Description of file: catalog.dat
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Bytes Format Units Label Explanations
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1- 11 F11.7 deg RAdeg Right ascension (J2000)
13- 22 F10.7 deg DEdeg Declination (J2000)
24- 29 F6.3 mag umag ?=- JAVA u magnitude
31- 36 F6.3 mag e_umag ?=- Error in u_java magnitude
38- 43 F6.3 mag gmag SDSS g magnitude
45- 49 F5.3 mag e_gmag Error in g_sdss magnitude
51- 56 F6.3 mag rmag SDSS r magnitude
58- 62 F5.3 mag e_rmag Error in r_sdss magnitude
64- 69 F6.3 mag imag SDSS i magnitude
71- 75 F5.3 mag e_imag Error in i_sdss magnitude
77- 82 F6.3 mag zmag SDSS z magnitude
84- 88 F5.3 mag e_zmag Error in z magnitude
90- 95 F6.3 mag J378 J378 magnitude
97-102 F6.3 mag e_J378 Error in J378 magnitude
104-109 F6.3 mag J395 J395 magnitude
111-116 F6.3 mag e_J395 Error in J395 magnitude
118-123 F6.3 mag J410 J410 magnitude
125-130 F6.3 mag e_J410 Error in J410 magnitude
132-137 F6.3 mag J430 ?=- J430 magnitude
139-143 F5.3 mag e_J430 ?=- Error in J430 magnitude
145-150 F6.3 mag J515 ?=- J515 magnitude
152-156 F5.3 mag e_J515 ?=- Error in J515 magnitude
158-163 F6.3 mag J660 J660 magnitude
165-169 F5.3 mag e_J660 Error in J660 magnitude
171-176 F6.3 mag J861 J861 magnitude
178-182 F5.3 mag e_J861 Error in J861
184-189 F6.3 mas/yr PM GAIA EDR3 total proper motion
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Acknowledgements:
Ana L. Chies Santos, ana.chies(at)ufrgs.br
Rafael S. de Souza, Juan P. Caso and Peng Chen
History:
05-Sep-2022: on-line version
07-Jun-2023: tablea1 added (from electronic version of the paper)
(End) Patricia Vannier [CDS] 02-Aug-2022