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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 (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:
FileName Lrecl Records Explanations
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
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
Bytes Format Units Label Explanations
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)
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
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
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
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)
Byte-by-byte Description of file: table5.dat
Bytes Format Units Label Explanations
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
Acknowledgements: Samuel Boissier, samuel.boissier(at) References: Boselli et al., Paper I 2011A&A...528A.107B, Cat. J/A+A/528/A107 Boissier et al., Paper II 2012A&A...545A.142B Voyer et al., Paper III 2014A&A...569A.124V, Cat. J/A+A/569/A124 Boselli et al., Paper IV 2014A&A...570A..69B, Cat. J/A+A/570/A69 Boissier et al., Paper V 2015A&A...579A..29B, Cat. J/A+A/579/A29 Boselli et al., Paper VI 2016A&A...585A...2B
(End) Samuel Boissier [LAM, France], Patricia Vannier [CDS] 04-Jan-2018
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