J/MNRAS/414/2246 EROs in Groth Strip (Hempel+, 2011)
The morphologies and masses of extremely red galaxies in the Groth Strip.
Hempel A., Cristobal-Hornillos D., Prieto M., Trujillo I., Balcells M.,
Lopez-Sanjuan C., Abreu D., Eliche-Moral M.C., Dominguez-Palmero L.
<Mon. Not. R. Astron. Soc., 414, 2246-2264 (2011)>
=2011MNRAS.414.2246H 2011MNRAS.414.2246H
ADC_Keywords: Infrared sources ; Galaxies, photometry ; Morphology
Keywords: galaxies: evolution - galaxies: high-redshift - galaxies: photometry -
galaxies: star formation - galaxies: stellar content -
galaxies: structure
Abstract:
We present a new catalogue of EROs from the Groth Strip and study the
relation between their morphology and mass. With a selection criterion
F814W-Ks≥4 and Ks≤21.0 we find 102 EROs, over a survey area of
155 arcmin2, leading to a surface density of 0.66arcmin-2. The
photometric data include U, B, F606W, F814W, J, Ks bands. Morphologies
are based on a by eye classification and we distinguish between three
basic classes: compact objects, targets with a disc and/or a bulge
component and irregular or merger candidates. An additional group
consists of the few objects which could not be classified.
Description:
We have selected a sample of extremely red galaxies (EROs) from the
GOYA Survey (Balcells et al., 2002INGN....6...11B 2002INGN....6...11B). This is a combined
Ks selected catalogue covering the Groth-Westphal strip
(∼155arcmin2) in four optical bands, U, B, F606W and F814W, as well
as J, Ks in the NIR.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 129 108 Summary of photometric, morphological and
structural parameters
tablea2.dat 76 108 Results of mass and age analysis
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See also:
J/ApJ/581/844 : Radio and Infrared observations of EROs (Smail+, 2002)
J/MNRAS/330/1 : HST observations of Extremely Red Objects (Smith+, 2002)
J/PASJ/55/1079 : BVRi'z'JHKs photometry of ERO objects (Miyazaki+, 2003)
J/MNRAS/346/1125 : Faint Extremely Red Objects IK photometry (Gilbank+, 2003)
J/A+A/432/69 : Extremely Red Objects XMM-Newton observations (Brusa+, 2005)
J/ApJ/627/621 : Catalog of Extremely Red Objects (Sawicki+, 2005)
J/MNRAS/361/525 : Las Campanas Infrared Survey. V. (Doherty+, 2005)
Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- --- [ero_]
5- 22 A18 --- ero ero name (HHMMSS.ss+DDMMSS.s, J2000) (G1)
23 A1 --- n_ero [*#] DRG(*) or excluded object (#) (1)
25- 28 F4.2 --- zph Photometric redshift
30- 33 F4.2 --- e_zph rms uncertainty on zph
35- 36 A2 --- Class Visual classification (2)
38- 45 A8 --- Vote Security of the vote, Secure/Unsecure (3)
47- 51 F5.2 mag F814W Aperture magnitude F814W
53- 56 F4.2 mag e_F814W rms uncertainty on F814W
58- 62 F5.2 mag Ksmag Aperture magnitude Ks
64- 67 F4.2 mag e_Ksmag rms uncertainty on Ksmag
69- 72 F4.2 mag F814W-Ks F814W-Ks colour index
74- 78 F5.2 kpc ae Effective radius (half-light radius along
semimajor axis)
80- 84 F5.2 kpc e_ae rms uncertainty on ae
86- 90 F5.2 --- n Sersic index
92- 98 F7.2 --- e_n rms uncertainty on n
100-103 F4.2 --- b/a Axial ratio
105-110 F6.2 --- e_b/a rms uncertainty on b/a
112-116 F5.2 mag F814WG GALFIT F814W magnitude
119-123 F5.2 mag e_F814WG ?=99.00 rms uncertainty on F814WG
125-129 F5.3 --- chi2G GALFIT χ2 value
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Note (1): Individual notes as follows:
* = object fulfil also the colour criteria for DRGs (distant red galaxy):
J-K>2.3
# = object shows extremely low effective radii (reff≤0.01kpc) and
was excluded from our final target list
Note (2): Classification as follows:
1 = objects with very compact morphology, like expected for early-type
galaxies
2a = objects with bulge and disc component (early-type discs)
2b = disc galaxies with no clear bulge component, including edge-on discs
(late-type discs)
2c = extended objects with bulge and/or disc component, for which no clear
classification as either class 2a or class 2b was possible
3 = irregular or merger candidates
4 = no clear classification at all
Note (3): Each galaxy in our sample of 102 EROs was classified individually by
four of the authors (A. Hempel, M. Prieto, I. Trujillo and M. Balcells).
Sources for which at least three classifications agree are considered
as 'secure'.
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Byte-by-byte Description of file: tablea2.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- --- [ero_]
5- 22 A18 --- ero ero name (HHMMSS.ss+DDMMSS.s, J2000) (G1)
24 I1 --- zf [3/8]?=- Formation redshift
26- 29 F4.2 Gyr tau ?=- Exponential decay time
31- 33 F3.1 mag AV ?=- Optical depth
35- 39 F5.3 [-] Z ?=- Metallicity
41- 45 F5.2 Gpc DL Luminosity distance
47- 50 F4.2 Gpc E_DL Error on DL (upper limit)
52- 55 F4.2 Gpc e_DL Error on DL (lower limit)
57- 62 F6.3 10+10Msun Mtot ?=- Total stellar mass
64- 69 F6.3 10+8yr Age ?=- Age
71- 76 F6.2 --- chi2 ?=- χ2 value
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Global notes:
Note (G1): Sources identified as
<[HCP2011] ero JHHMMSS.ss+DDMMSS.s> in Simbad
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 17-Feb-2012