J/A+A/611/A42 GALEX BCG galaxies sample properties (Boissier+, 2018)
The GALEX Ultraviolet Virgo Cluster Survey (GUViCS).
VII.: Brightest cluster galaxy UV upturn and the FUV-NUV color up to
redshift 0.35.
Boissier S., Cucciati O., Boselli A., Mei S., Ferrarese L.
<Astron. Astrophys. 611, A42 (2018)>
=2018A&A...611A..42B 2018A&A...611A..42B (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, galaxy ; Galaxies, photometry ;
Photometry, ultraviolet ; Spectroscopy
Keywords: ultraviolet: galaxies - galaxies: ellipticals and lenticulars, cD -
galaxies: stellar content
Abstract:
At low redshift, early-type galaxies often exhibit a rising flux with
decreasing wavelength in the 1000-2500Å range, called "UV upturn".
The origin of this phenomenon is debated, and its evolution with
redshift is poorly constrained. The observed GALEX FUV-NUV color can
be used to probe the UV upturn up to redshift about 0.5.
We aim to provide constraints on the existence of the UV upturn up to
redshift ∼0.4 in Brightest Cluster Galaxies (BCG) galaxies located
behind the Virgo cluster, using data from the GUViCS survey.
We estimate the FUV and NUV observed magnitudes for BCGs from the
maxBCG catalog in the GUViCS fields. We increase the number of non
local galaxies identified as BCGs with GALEX photometry from a few
tens of galaxies to 166 (64 when restricting this sample to relatively
small error-bars). We also estimate a central color within a 20-arcsec
aperture. By using the r band luminosity from the maxBCG catalog, we
can separate blue FUV-NUV due to recent star formation and candidate
upturn cases. We use Lick indices to verify their similitude to
redshift 0 upturn cases.
We clearly detect a population of blue FUV-NUV BCGs in the redshift
range 0.10-0.35, vastly improving the existing constraints at these
epochs by increasing the number of galaxies studied, and by exploring
a redshift range with no previous data (beyond 0.2), spanning 1 more
Gyr in the past. These galaxies bring new constrains that can help
distinguish between assumptions concerning the stellar populations
causing the UV upturn phenomenon. The existence of a large number of
UV upturns around redshift 0.25 favors the existence of a binary
channel among the sources proposed in the literature.
Description:
Tables 2 to 5 from the paper, providing the properties of a sample of
166 BCG galaxies with UV photometry from GALEX. In table 3 -9.999999
indicates galaxies for which no values is provided.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 57 177 Sample and basic properties from Koester+2007
table3.dat 71 150 Spectroscopic information from SDSS
table4.dat 88 177 UV photometry
table5.dat 63 156 Our flags and notes
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See also:
J/ApJ/660/239 : 13823 galaxy clusters MaxBCG catalog from SDSS (Koester+ 2007)
J/A+A/528/A107 : GALEX Ultraviolet Virgo Cluster Survey, GUViCS (Boselli+ 2011)
J/A+A/569/A124 : GUViCS. Ultraviolet Source Catalogs (Voyer+, 2014)
J/A+A/570/A69 : GALEX Ultraviolet Virgo Cluster Survey. IV. (Boselli+, 2014)
J/A+A/579/A29 : The GUViCS FUV diffuse emission (Boissier+, 2015)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- ID ID number from Koester et al.
(2007, Cat. J/ApJ/660/239), BCG NNNNN)
12- 20 F9.5 deg RAdeg Right ascension (J2000.0)
22- 30 F9.6 deg DEdeg Declination (J2000.0)
32- 39 F8.6 --- zph Photometric redshift
41- 48 F8.5 10+10Lsun Lr r band lumininosity (1010Lsol)
50- 57 F8.5 10+10Lsun Li i band lumininosity (1010Lsol)
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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 --- ID ID number from Koester et al.
(2007, Cat. J/ApJ/660/239), BCG NNNNN)
12- 19 F8.6 --- zsp Spectroscopic redshift
21- 31 A11 --- Class SDSS sub class
33- 41 F9.6 --- Mg2 ?=-9.999999 Mg2 index
43- 51 F9.6 --- e_Mg2 ?=-9.999999 Uncertainty on Mg2
53- 61 F9.6 --- Hb ?=-9.999999 Hbeta index
63- 71 F9.6 --- e_Hb ?=-9.999999 Uncertainty on Hb
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- ID ID number from Koester et al.
(2007, Cat. J/ApJ/660/239), BCG NNNNN)
12- 18 I7 s ExpFUV Exposure time FUV
20- 26 I7 s ExpNUV Exposure time NUV
28- 29 I2 pix Aper Best aperture (in pixels)
31- 36 F6.2 mag FUV ?=-99.9 AB FUV magnitude
38- 41 F4.2 mag E_FUV ?=0 Error on FUV (+1 sigma)
43- 48 F6.2 mag e_FUV ?=0 Error on FUV (-1 sigma)
50- 55 F6.2 mag NUV AB NUV magnitude
57- 60 F4.2 mag E_NUV Error on NUV (+1 sigma)
62- 67 F6.2 mag e_NUV Error on NUV (-1 sigma)
69- 74 F6.2 mag cF-N ?=-99.9 Central FUV-NUV color
76- 81 F6.2 mag E_cF-N ?=0 Error on cF-N (+1 sigma)
83- 88 F6.2 mag e_cF-N ?=0 Error on cF-N (-1 sigma)
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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- 10 A10 --- ID ID number from Koester et al.
(2007, Cat. J/ApJ/660/239), BCG NNNNN)
12- 21 A10 --- fFUV Flag FUV
23- 32 A10 --- fNUV Flag NUV
34- 63 A30 --- Notes Comments on morphology
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Acknowledgements:
Samuel Boissier, samuel.boissier(at)lam.fr
References:
Boselli et al., Paper I 2011A&A...528A.107B 2011A&A...528A.107B, Cat. J/A+A/528/A107
Boissier et al., Paper II 2012A&A...545A.142B 2012A&A...545A.142B
Voyer et al., Paper III 2014A&A...569A.124V 2014A&A...569A.124V, Cat. J/A+A/569/A124
Boselli et al., Paper IV 2014A&A...570A..69B 2014A&A...570A..69B, Cat. J/A+A/570/A69
Boissier et al., Paper V 2015A&A...579A..29B 2015A&A...579A..29B, Cat. J/A+A/579/A29
Boselli et al., Paper VI 2016A&A...585A...2B 2016A&A...585A...2B
(End) Samuel Boissier [LAM, France], Patricia Vannier [CDS] 04-Jan-2018