J/A+A/429/819 Photometry in elliptical galaxies. II. (Michard+, 2005)
Peculiarities and populations in elliptical galaxies.
II. Visual-near IR colours as population indices.
Michard R.
<Astron. Astrophys., 429, 819-823 (2005)>
=2005A&A...429..819M 2005A&A...429..819M (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, photometry
Keywords: galaxies: elliptical and lenticulars, CD - galaxies: photometry
Abstract:
As a complement to the data collected and discussed in Paper I of
this series (Michard & Prugniel, 2004, J/A+A/423/833) 2MASS near-IR
images have been used, in connection with available V-light aperture
photometry to derive the colours V-J, V-K, J-H and J-K within the
effective aperture Ae: nearly the same complete sample of 110 E-type
galaxies is treated.
In Paper I these were classified, based on morphological criteria,
into the "peculiar'' (or Pec) and "normal'' (or Nop) subsamples.
The data included here supersede the previous catalog J/A+A/423/833.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
residual.dat 106 37 Residuals of colours- and line-indices of ellipticals
in the Pec subsample, against the standard relations
calculated for the Nop subsample between Indices and
the central velocity dispersion
(table7 of A&A, 423, 833 and table2 of this paper)
table4.dat 150 117 Data compiled and derived for the full sample
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See also:
VII/184 : Survey of 108 E-S0 galaxies (Michard+, 1993-94)
J/A+A/309/749 : Fundamental plane of early type galaxies (Prugniel+ 1996)
J/A+AS/103/573 : UBVRI Photometry of bright southern galaxies (Poulain+ 1994)
J/A+AS/104/179 : Surface photometry in Shapley-Ames galaxies (Goudfrooij+ 1994)
J/ApJS/70/329 : IRAS flux densities for early-type galaxies (Knapp+ 1989)
Byte-by-byte Description of file: residual.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Name NGC, IC number
10- 13 F4.1 --- S2 Peculiarity index
16- 21 F6.3 mag D(U-B) U-B residual
23- 28 F6.3 mag D(B-V) B-V residual
30- 35 F6.3 mag D(B-R) ?=9.990 B-R residual
37- 42 F6.3 mag D(V-I) ?=9.990 V-I residual
44- 49 F6.3 mag D(Mg2) Mg2 index residual
51- 55 F5.2 0.1nm D(Hbeta) ?=9.99 Hbeta index residual
57- 61 F5.2 0.1nm D(<Fe>) ?=9.99 <Fe> index residual
63- 67 F5.2 0.1nm D(Mg_b) ?=9.99 Mgb index residual
69- 74 F6.3 mag D(V-J) ? V-J residual (2)
76- 81 F6.3 mag D(V-K) ? V-K residual (2)
83- 88 F6.3 mag D(J-H) ? J-H residual (2)
90- 95 F6.3 mag D(J-K) ? J-K residual (2)
97-102 F6.3 mag MIYPn Mean Index of Young Population
104-106 A3 --- Pop Family YP or NP (1)
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Note (1): ":" stands for uncertain index.
Note (2): NGC 1344 and NGC 3640 could not be measured in 2MASS.
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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- 8 A8 --- Name NGC or IC number
10- 14 F5.2 mag mu1 Distance modulus from Prugniel & Simien,
1996, Cat. J/A+A/309/749, hereafter PS96
16- 20 F5.2 mag mu2 Distance modulus from Tonry et al.,
2001ApJ...546..681T 2001ApJ...546..681T
22- 26 F5.2 mag BT B total magnitude from PS96
28- 31 F4.2 [arcsec] logRe Adopted effective radius (derived from PS96)
33- 36 F4.2 --- eps Ellipticity near Re (1)
38- 43 F6.2 mag BMAG1 Absolute B magnitude from BT and Mu1
45- 50 F6.2 mag BMAG2 Absolute B magnitude from BT and Mu2
52- 55 F4.2 mag U-B Integrated U-B colour within Re (2)
57- 60 F4.2 mag B-V Integrated B-V colour within Re (2)
62- 65 F4.2 mag B-R Integrated B-R colour within Re (2)
67- 70 F4.2 mag V-I Integrated V-I colour within Re (2)
72- 75 F4.2 mag V-J Integrated V-J colour within Re (2)
77- 80 F4.2 mag V-K Integrated V-K colour within Re (2)
82- 85 F4.2 mag J-H Integrated J-H colour within Re (2)
87- 90 F4.2 mag J-K Integrated J-K colour within Re (2)
92- 96 F5.3 mag Mg2 Mg2 index from PS96
98-101 F4.2 0.1nm Hbeta Average Hβ index (3)
103 I1 --- W1 Number of Hbeta index sources
105-108 F4.2 0.1nm <Fe> Average <Fe> index (3)
110 I1 --- W2 Number of <Fe> index sources
112-115 F4.2 0.1nm Mgb Average Mgb index (3)
117 I1 --- W3 Number of Mgb index sources
119-121 I3 km/s sigma0 Central velocity dispersion
123-125 I3 km/s Vrot Maximum rotational velocity
127-130 I4 Jy F60um IRAS 60um flux normalized to Virgo distance (4)
132-135 I4 Jy F100um IRAS 100um flux normalized to Virgo distance (4)
137-140 F4.2 --- Dens Density of environment (unity in Virgo Cl.)
142-145 A4 --- Type Classification as boxy, disky, undeterminate
147-150 F4.1 --- S2 Peculiarity index (G1)
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Note (1): Ellipticity is compiled from
Goudfrooij et al., 1994, Cat. J/A+AS/104/179 and
Michard & Marchal, 1994A&AS..105..481M 1994A&AS..105..481M, Cat. VII/184
Note (2): Colours are compiled from several sources with preference for
Poulain & Nieto 1994, Cat. J/A+AS/103/573
Note (3): The line indices Hβ, <Fe>, Mg_b are compiled from severa
l sources and averaged with a zero-point adjustment.
Note (4): The IRAS fluxes at 60 and 100 microns are taken from Knapp et al.,
1989, Cat. J/ApJS/70/329 and corrected to the Virgo Cluster distances.
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Global Notes:
Note (G1): The pecularity index S2 takes into account the following elements:
- Discrete features classically recognized in possible post-mergers
or in perturbed E-galaxies
- Asymetries of the outer regions in E-galaxies
- anomalous forms of the envelopes
Objects with S2<1 are "normal", and the index varies from 0 to
slightly above 10 for NGC 2865 and 3923, the most peculiar objects
in the sample.
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Acknowledgements: Raymond Michard, raymond.michard(at)obspm.fr
References:
Michard & Prugniel, Paper I 2004A&A...423..833M 2004A&A...423..833M, Cat. J/A+A/423/833
(End) Patricia Vannier [CDS] 18-Jan-2005