J/MNRAS/385/2097 NUV-J colours of red-sequence galaxies (Rawle+, 2008)
Near ultraviolet-infrared colours of red-sequence galaxies in local clusters.
Rawle T.D., Smith R.J., Lucey J.R., Hudson M.J., Wegner G.A.
<Mon. Not. R. Astron. Soc., 385, 2097-2106 (2008)>
=2008MNRAS.385.2097R 2008MNRAS.385.2097R
ADC_Keywords: Galaxies, photometry ; Ultraviolet ; Redshifts
Keywords: galaxies: elliptical and lenticular, cD - galaxies: stellar content -
ultraviolet: galaxies
Abstract:
We present GALEX near-ultraviolet (NUV) and Two-Micron All-Sky Survey
J-band photometry for red-sequence galaxies in local clusters. We
define quiescent samples according to a strict emission threshold,
removing galaxies with very recent star formation. We analyse the NUVJ
colour-magnitude relation (CMR) and find that the intrinsic scatter is
an order of magnitude larger than for the analogous optical CMR (∼0.35
rather than 0.05mag), in agreement with previous studies. Comparing
the NUVJ colours with spectroscopically derived stellar population
parameters, we find a strong (>5.5sigma) correlation with metallicity,
only a marginal trend with age, and no correlation with the alpha/Fe
ratio. We explore the origin of the large scatter and conclude that
neither aperture effects nor the UV upturn phenomenon contribute
significantly. We show that the scatter could be attributed to simple
'frosting' by either a young or a low-metallicity subpopulation.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 74 920 Data for galaxies in the NFPS sample
table4.dat 85 156 *Data for galaxies in the SSC sample
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Note on table4.dat: Supercluster mean czCMB=14660km/s for all galaxies.
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See also:
II/246 : The 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
J/AJ/130/825 : GALEX ultraviolet variability catalog (Welsh+, 2005)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 22 A22 --- Galaxy Galaxy designation (NFPJHHMMSS.s+DDMMSS)
24- 28 I5 km/s czCMB Mean cluster cz in CMB frame
30- 34 I5 km/s cz Galaxy cz in heliocentric frame
36- 41 F6.3 mag Jmag Apparent J magnitude (G1)
43- 47 F5.3 mag e_Jmag rms uncertainty on Jmag
49- 54 F6.3 mag NUV-J NUV-J colour index (G1)
56- 61 F6.3 mag e_NUV-J rms uncertainty on NUV-J
63- 68 F6.3 mag FUV-J ?=- FUV-J colour index (G1)
70- 74 F5.3 mag e_FUV-J ?=- rms uncertainty on FUV-J
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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- 22 A22 --- Galaxy Galaxy name, NFPJHHMMSS.s+DDMMSS or
2MASXJHHMMSSss+DDMMSSs
24- 28 I5 km/s cz Galaxy cz in heliocentric frame
30- 35 F6.3 mag Jmag Apparent J magnitude (G1)
37- 41 F5.3 mag e_Jmag rms uncertainty in Jmag
43- 47 F5.3 mag NUV-J NUV-J colour index (G1)
49- 53 F5.3 mag e_NUV-J rms uncertainty on NUV-J
55- 58 F4.2 [Gyr] log(Age) ? Age
60- 63 F4.2 [Gyr] e_log(Age) ? rms uncertainty on Age
65- 69 F5.2 [Sun] [Z/H] ? [Z/H] abundance
71- 74 F4.2 [Sun] e_[Z/H] ? rms uncertainty on [Z/H]
76- 80 F5.2 [Sun] [alpha/Fe] ? [α/Fe] abundance
82- 85 F4.2 [Sun] e_[alpha/Fe] ? rms uncertainty on [α/Fe]
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Global notes:
Note (G1): Magnitudes (Kron-type apertures) and colours (12" diameter
apertures) are in the AB system and have been galactic extinction
corrected, but not K-corrected.
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 16-Sep-2008