J/MNRAS/451/2625 SLUGGS Globular Cluster CaT and [Z/H] (Pastorello+, 2015)
The SLUGGS survey: Combining stellar and globular cluster metallicities
in the outer regions of early-type galaxies.
Pastorello N., Forbes D.A., Usher C., Brodie J.P., Romanowsky A.J.,
Strader J., Spitler L.R., Alabi A.B., Foster C., Jennings Z.G.,
Kartha S.S., Pota V.
<Mon. Not. R. Astron. Soc. 451, 2625-2639 (2015)>
=2015MNRAS.451.2625P 2015MNRAS.451.2625P
ADC_Keywords: Clusters, globular ; Associations, stellar ; Abundances
Keywords: galaxies: star clusters: general - galaxies: stellar content -
globular clusters: general - galaxies: abundances
Abstract:
The outer halo regions of early-type galaxies carry key information
about their past accretion history. However, spectroscopically probing
the stellar component at such galactocentric radii is still
challenging. Using the DEep Imaging Multi-Object Spectrograph on the
Keck, we have been able to measure the metallicities of the stellar
and globular cluster components in 12 early-type galaxies out to more
than 10Re.
Description:
As part of the SLUGGS (sluggs.swin.edu.au) survey of globular clusters
(GCs) around early-type galaxies we present here the strength of
near-infrared calcium triplet (CaT) of the 1129 GCs in 12 galaxies
using DEIMOS on Keck. We have used the CaT strength to derive
metallicity of each GC using the single stellar population models of
Vazdekis et al. (2003MNRAS.340.1317V 2003MNRAS.340.1317V).
The 12 galaxies are:
NGC1023, NGC1400, NGC1407, NGC2768, NGC3115, NGC3377, NGC4278,
NGC4365, NGC4473, NGC4494, NGC4649 and NGC5846.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 46 12 Galaxy parameters
table2.dat 89 1129 Ca Triplet measurements and metallicities in the
globular clusters of 12 galaxies
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See also:
J/MNRAS/426/1475 : CaT in 903 globular clusters (Usher+, 2012)
J/MNRAS/428/389 : SLUGGS globular clusters in early-type galaxies (Pota+ 2013)
J/MNRAS/436/1172 : Globular Clusters of NGC 4278 in SLUGGS (Usher+, 2013)
J/AJ/148/32 : Globular cluster candidates in NGC 3115 (Jennings+, 2014)
sluggs.swin.edu.au : The SLUGGS Survey Home Page
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- --- [NGC]
4- 7 I4 --- NGC Galaxy NGC number
10- 11 I2 arcsec Re [27/66] Effective radius of galacy
13- 19 A7 --- MType Morphological type
21- 24 F4.1 Mpc Dist [9/27] Galaxy distance
26- 28 I3 km/s sigma [135/308] Central velocity dispersion from
Brodie et al. (2014ApJ...796...52B 2014ApJ...796...52B)
30- 35 F6.2 mag Bmag [-22/-19] Total B-band absolute magnitude from
de Vaucouleurs et al. 1991 (VII/155), corrected
for galaxy extinction
37- 41 F5.2 [Msun] logM* [10.4/11.5] Total logarithmic stellar mass (1)
43- 46 F4.2 mag g-i [0.8/1] g-i colour index marking the split
between the blue and red GC subpopulations (2)
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Note (1): obtained from the K-band extinction corrected absolute magnitude
from the 2MASS source catalogue (Jarrett et al. 2000AJ....119.2498J 2000AJ....119.2498J, Cat.
VII/233), obtained following the same approach as in Pastorello et al.
(2014MNRAS.442.1003P 2014MNRAS.442.1003P), assuming the distances in Brodie et al.
(2014ApJ...796...52B 2014ApJ...796...52B)
Note (2): from Usher et al. (2012MNRAS.426.1475U 2012MNRAS.426.1475U, Cat. J/MNRAS/426/1475),
except for NGC 1023, NGC 4473 and NGC 4649 (calculated in this work).
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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- 3 A3 --- --- [NGC]
4- 7 I4 --- NGC Galaxy NGC number
8 A1 --- --- [_]
9- 14 A6 --- Cl Designation of globular cluster (GC) or
Ultra-Compact Dwarf (UCD) in galaxy
16- 25 F10.6 deg RAdeg Right Ascension in degrees (J2000)
27- 36 F10.6 deg DEdeg Declination in degrees (J2000)
38- 41 F4.2 mag g-i ?=0 Adopted g-i colour index
43- 46 F4.2 mag e_g-i ?=0 Uncertainty in g-i colour index
48- 52 F5.2 mag imag ?=0 Adopted i magnitude
54- 57 F4.2 mag e_imag ?=0 Uncertainty in i magnitude
59- 63 F5.2 0.1nm CaT [2.5/10.6] CaT index
65- 68 F4.2 0.1nm e_CaT [0.1/2] Negative uncertainty of CaT index
70- 73 F4.2 0.1nm E_CaT [0.1/2.1] Positive uncertainty of CaT index
75- 79 F5.2 [Sun] [Z/H] [-2.6/1.2] Metallicity
81- 84 F4.2 [Sun] e_[Z/H] [0.05/1] Negative uncertainty of metallicity
86- 89 F4.2 [Sun] E_[Z/H] [0.09/1] Positive uncertainty of metallicity
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Acknowledgements:
Nicola Pastorello, npastorello(at)swin.edu.au
References:
Brodie et al., 2014ApJ...796...52B 2014ApJ...796...52B, SAGES Legacy Unifying Globulars and
GalaxieS survey (SLUGGS): sample definition, methods, and initial results.
History:
* 15-Jun-2015: on-line version
* 15-Mar-2017: table3.dat renamed table2.dat, as in the paper
(End) Nicola Pastorello [Swinburne], Patricia Vannier [CDS] 18-May-2015