J/other/RAA/15.1392 LAMOST globular clusters in M 31 and M 33 (Chen+, 2015)
The LAMOST spectroscopic survey of globular clusters in M 31 and M 33.
I. catalog and new identifications.
Chen B.-Q., Liu X.-W., Xiang M.-S., Yuan H.-B., Huang Y., Huo Z.-Y.,
Sun N.-C., Wang C., Ren J.-J., Zhang H.-W., Rebassa-Mansergas A., Yang M.,
Zhang Y., Hou Y.-H., Wang Y.-F.
<Res. Astron. Astrophys., 15, 1392-1413 (2015)>
=2015RAA....15.1392C 2015RAA....15.1392C (SIMBAD/NED BibCode)
ADC_Keywords: Surveys ; Galaxies, nearby ; Clusters, globular ;
Radial velocities
Keywords: galaxies: individual: M31, M33 - galaxies: star clusters -
galaxies: Local Group
Abstract:
We present a catalog of 908 objects observed with the Large Sky Area
Multi-Object Fiber Spectroscopic Telescope (LAMOST) in fields in the
vicinity of M31 and M33, targeted as globular clusters (GCs) and
candidates. The targets include known GCs and candidates selected from
the literature, as well as new candidates selected from the Sloan
Digital Sky Survey (SDSS). Analysis shows that 356 of them are likely
GCs with various confidence levels, while the remaining ones turn out
to be background galaxies and quasars, stars and HII regions in M31 or
foreground Galactic stars. The 356 likely GCs include 298 bona fide
GCs and 26 candidates known in the literature. Three candidates,
selected from the Revised Bologna Catalog of M31 GCs and candidates
(RBC) and one possible cluster from Johnson et al.(2012, Cat.
J/ApJ/752/95), are confirmed to be bona fide clusters. We search for
new GCs in the halo of the M31 among the new candidates selected from
the SDSS photometry. Based on radial velocities yielded by LAMOST
spectra and visual examination of the SDSS images, we find 28 objects,
5 bona fide and 23 likely GCs. Among the five bona fide GCs, three
have been recently discovered independently by others, and the
remaining 25 are our new identifications, including two bona fide
ones. The newly identified objects fall at projected distances ranging
from 13 to 265kpc from M31. Of the two newly discovered bona fide GCs,
one is located near M33, probably a GC belonging to M33. The other
bona fide GC falls on the Giant Stream with a projected distance of
78kpc from M31. Of the 23 newly identified likely GCs, one has a
projected distance of about 265kpc from M31 and could be an
intergalactic cluster.
Description:
Following a two-year commissioning phase, the LAMOST Pilot Surveys
were initiated in October 2011 and completed in June 2012. The regular
surveys, expect ed to last five years, were initiated in October 2012.
In the current work we present results based on data collected by
LAMOST in the 2011, 2012 and 2013 observational seasons, i.e. from the
pil ot survey and the first two years of the regular surveys.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 82 5 Positions and properties of five confirmed GCs
from the SDSS sample of targets
table3.dat 82 23 Positions and properties of newly discovered
GC candidates
table5.dat 45 298 Known GCs from the RBC V5 (Galletti et al., 2012,
Cat. V/143) and from Johnson et al.
(2012, Cat. J/ApJ/752/95) observed by LAMOST
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See also:
V/146 : LAMOST DR1 catalogs (Luo+, 2015)
J/ApJ/752/95 : PHAT stellar cluster survey. I. Year 1 (Johnson+, 2012)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Name Name (LAMOST-N)
10 A1 --- r_Name Discovery reference on Name (1)
12- 19 F8.5 deg RAdeg Right Ascension in decimal degrees (J2000)
21- 28 F8.5 deg DEdeg Declination in decimal degrees (J2000)
30- 35 F6.2 kpc Xpos X position
37- 43 F7.2 kpc Ypos Y position
45- 50 F6.2 kpc Rp Projected distance
52- 55 F4.2 mag g-r g-r color index
57- 60 F4.2 mag r-i r-i color index
62- 66 F5.2 mag imagm model i magnitude
68- 72 F5.2 mag VMag Absolute B-band magnitude
74- 77 F4.2 mag Dimag ipsf-imodel magnitude difference
79- 82 I4 km/s RV Radial velocity
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Note (1): Reference codes are defined as follows:
a = Identified previously by Huxor et al. (2014MNRAS.442.2165H 2014MNRAS.442.2165H) as
'PAndAS-36' in their Table1.
b = Identified previously by di Tullio Zinn & Zinn (2014AJ....147...90D 2014AJ....147...90D) as
'D' in their Table1.
c = Identified previously by Huxor et al. (2014MNRAS.442.2165H 2014MNRAS.442.2165H) as
'PAndAS-46' in their Table1.
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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- 10 A10 --- Name Name (LAMOST-CNN)
12- 19 F8.5 deg RAdeg Right ascension (J2000)
21- 28 F8.5 deg DEdeg Declination (J2000)
30- 36 F7.2 kpc Xpos X position
38- 44 F7.2 kpc Ypos Y position
46- 51 F6.2 kpc Rp Projected distance
53- 56 F4.2 mag g-r g-r colour index
58- 61 F4.2 mag r-i r-i colour index
63- 67 F5.2 mag imagm model i magnitude
69- 72 F4.2 mag Dimag ipsf-imodel magnitude difference
74- 77 I4 km/s RV Radial velocity
79- 82 F4.1 [-] [Fe/H] Metallicity (1)
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Note (1): Metallicities derived by the LSP3 which assumes all objects to be
stars (Xiang et al., 2015, Cat. J/MNRAS/448/822)
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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- 8 A8 --- Name Globulat cluster name
11- 18 F8.5 deg RAdeg Right ascension (J2000)
20- 27 F8.5 deg DEdeg Declination (J2000)
29- 34 F6.2 kpc Rp Projected distance
36- 39 I4 km/s RV New radial velocity
41- 45 I5 km/s RVrbc ?=99999 RBC (V/143) radial velocity
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History:
From electronic version of the journal
References:
Chen et al., Paper II 2016AJ....152...45C 2016AJ....152...45C , Cat. J/AJ/152/45
(End) Patricia Vannier [CDS] 25-Nov-2015