J/A+A/623/A65 Multiphotometry of M31 outer halo globular clusters (Wang+, 2019)
Globular clusters in the outer halo of M31.
Wang S., Ma J., Liu J.
<Astron. Astrophys. 623, A65 (2019)>
=2019A&A...623A..65W 2019A&A...623A..65W (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, nearby ; Clusters, globular ; Energy distributions ;
Photometry, UBVRI ; Photometry, ultraviolet ; Photometry, SDSS ;
Photometry, infrared
Keywords: galaxies: individual; M31 - galaxies: globular clusters -
galaxies: stellar content
Abstract:
In this paper, we present photometry of 53 globular clusters (GCs) in
the M31 outer halo, including the GALEX FUV and NUV, SDSS ugriz, 15
intermediate-band filters of BATC, and 2MASS JHKs bands. By comparing
the multicolour photometry with stellar population synthesis models,
we determine the metallicities, ages, and masses for these GCs, aiming
to probe the merging/accretion history of M31. We find no clear trend
of metallicity and mass with the de-projected radius. The halo GCs
with age younger than ∼8Gyr are mostly located at the de-projected
radii around 100kpc, but this may be due to a selection effect. We
also find that the halo GCs have consistent metallicities with their
spatially-associated substructures, which provides further evidence of
the physical association between them. Both the disk and halo GCs in
M31 show a bimodal luminosity distribution. However, we should
emphasize that there are more faint halo GCs which are not being seen
in the disk. There are more faint halo GCs than the disk ones, and
these faint GCs constitute the fainter part in the luminosity
function. The bimodal luminosity function of the halo GCs may reflect
different origin or evolution environment in their original hosts. The
M31 halo GCs includes one intermediate metallicity group
(-1.5<[Fe/H]←0.4) and one metal-poor group ([Fe/H]←1.5), while the
disk GCs have one metal-rich group more. There are considerable
differences between the halo GCs in M31 and the Milky Way (MW). The
total number of M31 GCs is approximately three times more numerous
than that of the MW, however, M31 has about six times the number of
halo GCs in the MW. Compared to M31 halo GCs, the Galactic halo ones
are mostly metal-poor. Both the numerous halo GCs and the
higher-metallicity component are suggestive of an active merger
history of M31.
Description:
The photometry data for the 53 globular clusters in the M31 outer halo
are presented, which are derived from the BATC, GALEX, SDSS, and 2MASS
observations.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 194 53 BATC intermediate-band photometry of
53 sample GCs in M31
table2.dat 128 53 GALEX, SDSS, and 2MASS NIR photometry of
53 sample GCs in M31
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See also:
J/A+A/416/917 : M31 globular clusters revised Bologna Catalog (Galleti+, 2004)
J/A+A/544/A155 : HST photometry of M31 globular clusters (Federici+, 2012)
J/AJ/143/14 : Lick indices of M31 globular clusters (Schiavon+, 2012)
J/ApJS/199/37 : GALEX catalog of star clusters in M31 (Kang+, 2012)
J/ApJ/769/10 : Spectroscopy of M31 globular clusters (Jacoby+, 2013)
J/AJ/146/20 : 79 M31 globular clusters structural parameters (Wang+, 2013)
J/AJ/148/4 : JHK photometry of 913 globular clusters in M31 (Wang+, 2014)
J/ApJ/797/116 : Chemical properties of M31 star clusters (Colucci+, 2014)
J/AJ/152/45 : LAMOST survey of star clusters in M31. II. (Chen+, 2016)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Object Globular cluster name
11- 15 F5.2 mag amag ? The magnitude in BATC a (337.15nm) band
17- 21 F5.2 mag bmag ? The magnitude in BATC b (390.69nm) band
23- 27 F5.2 mag cmag The magnitude in BATC c (419.35nm) band
29- 33 F5.2 mag dmag The magnitude in BATC d (454.00nm) band
35- 39 F5.2 mag emag The magnitude in BATC e (492.50nm) band
41- 45 F5.2 mag fmag The magnitude in BATC f (526.68nm) band
47- 51 F5.2 mag gmag The magnitude in BATC g (578.99nm) band
53- 57 F5.2 mag hmag The magnitude in BATC h (607.39nm) band
59- 63 F5.2 mag imag The magnitude in BATC i (665.59nm) band
65- 69 F5.2 mag jmag The magnitude in BATC j (705.74nm) band
71- 75 F5.2 mag kmag The magnitude in BATC k (754.63nm) band
77- 81 F5.2 mag mmag ? The magnitude in BATC m (802.32nm) band
83- 87 F5.2 mag nmag ? The magnitude in BATC n (848.43nm) band
89- 93 F5.2 mag omag ? The magnitude in BATC o (918.22nm) band
95- 99 F5.2 mag pmag ? The magnitude in BATC p (973.85nm) band
101-104 F4.1 arcsec Rap Photometric aperture
107-110 F4.2 mag e_amag ? 1 sigma uncertainty in BATC a (337.15nm) band
113-116 F4.2 mag e_bmag ? 1 sigma uncertainty in BATC b (390.69nm) band
119-122 F4.2 mag e_cmag 1 sigma uncertainty in BATC c (419.35nm) band
125-128 F4.2 mag e_dmag 1 sigma uncertainty in BATC d (454.00nm) band
131-134 F4.2 mag e_emag 1 sigma uncertainty in BATC e (492.50nm) band
137-140 F4.2 mag e_fmag 1 sigma uncertainty in BATC f (526.68nm) band
143-146 F4.2 mag e_gmag 1 sigma uncertainty in BATC g (578.99nm) band
149-152 F4.2 mag e_hmag 1 sigma uncertainty in BATC h (607.39nm) band
155-158 F4.2 mag e_imag 1 sigma uncertainty in BATC i (665.59nm) band
161-164 F4.2 mag e_jmag 1 sigma uncertainty in BATC j (705.74nm) band
167-170 F4.2 mag e_kmag 1 sigma uncertainty in BATC k (754.63nm) band
173-176 F4.2 mag e_mmag ? 1 sigma uncertainty in BATC m (802.32nm) band
179-182 F4.2 mag e_nmag ? 1 sigma uncertainty in BATC n (848.43nm) band
185-188 F4.2 mag e_omag ? 1 sigma uncertainty in BATC o (918.22nm) band
191-194 F4.2 mag e_pmag ? 1 sigma uncertainty in BATC p (973.85nm) band
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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- 9 A9 --- Object Globular cluster name
11- 15 F5.2 mag FUVmag ? The magnitude in GALEX FUV band
17- 21 F5.2 mag NUVmag ? The magnitude in GALEX NUV band
23- 27 F5.2 mag umag ? The magnitude in SDSS u band
29- 33 F5.2 mag gmag ? The magnitude in SDSS g band
35- 39 F5.2 mag rmag ? The magnitude in SDSS r band
41- 45 F5.2 mag imag ? The magnitude in SDSS i band
47- 51 F5.2 mag zmag ? The magnitude in SDSS z band
53- 57 F5.2 mag Jmag ? The magnitude in 2MASS J band
59- 63 F5.2 mag Hmag ? The magnitude in 2MASS H band
65- 69 F5.2 mag Ksmag ? The magnitude in 2MASS Ks band
71- 74 F4.2 mag e_FUVmag ? 1 sigma uncertainty in GALEX FUV band magnitude
77- 80 F4.2 mag e_NUVmag ? 1 sigma uncertainty in GALEX NUV band magnitude
83- 86 F4.2 mag e_umag ? 1 sigma uncertainty in SDSS u band magnitude
89- 92 F4.2 mag e_gmag ? 1 sigma uncertainty in SDSS g band magnitude
95- 98 F4.2 mag e_rmag ? 1 sigma uncertainty in SDSS r band magnitude
101-104 F4.2 mag e_imag ? 1 sigma uncertainty in SDSS i band magnitude
107-110 F4.2 mag e_zmag ? 1 sigma uncertainty in SDSS z band magnitude
113-116 F4.2 mag e_Jmag ? 1 sigma uncertainty in 2MASS J band magnitude
119-122 F4.2 mag e_Hmag ? 1 sigma uncertainty in 2MASS H band magnitude
125-128 F4.2 mag e_Ksmag ? 1 sigma uncertainty in 2MASS Ks band magnitude
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Acknowledgements:
Song Wang, songw(at)bao.ac.cn
(End) Song Wang [NAOC, China], Patricia Vannier [CDS] 31-Jan-2019