J/MNRAS/361/525 Las Campanas Infrared Survey. V. (Doherty+, 2005)
The Las Campanas Infrared Survey -
V. Keck spectroscopy of a large sample of extremely red objects.
Doherty M., Bunker A.J., Ellis R.S., McCarthy P.J.
<Mon. Not. R. Astron. Soc., 361, 525-549 (2005)>
=2005MNRAS.361..525D 2005MNRAS.361..525D (SIMBAD/NED BibCode)
ADC_Keywords: Surveys ; Galaxies, IR ; Photometry, infrared ; Redshifts
Keywords: galaxies: distances and redshifts - galaxies: evolution -
galaxies: stellar content - large-scale structure of Universe
Abstract:
We present deep Keck spectroscopy, using the Deep Imaging Multi-Object
Spectrograph and the Low-Resolution Imaging Spectrometer
spectrographs, of a large and representative sample of 67 extremely
red objects (EROs) to H=20.5 in three fields (SSA22, Chandra Deep
Field South and NTT Deep Field) drawn from the Las Campanas Infrared
Survey (LCIRS). Using the colour cut (I-H)>3.0 (Vega magnitudes)
adopted in earlier papers in this series, we verify the efficiency of
this selection for locating and studying distant old sources.
Spectroscopic redshifts are determined for 44 sources, of which only
two are contaminating low-mass stars. When allowance is made for
incompleteness, the spectroscopic redshift distribution closely
matches that predicted earlier on the basis of photometric data.
Description:
We obtained long-slit spectroscopy of 41 EROs on the nights of 2001
October 22-24 UT using LRIS at the f/15 Cassegrain focus of the 10-m
Keck I telescope. Spectra were obtained for 11 EROs in CDF-S
(including six that overlapped with the later DEIMOS sample, Section
3.2), and for 30 EROs in SSA22 (using two different masks).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 86 22 The CDF-S sample
table3.dat 87 23 The NTT sample
table4.dat 71 28 The SSA22 sample
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See also:
VII/228 : Las Campanas Infrared Survey (Chen+, 2001-2002)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- [DBE2005] Sequential number, CDFS INNNN (1)
13 I1 h RAh Right ascension (J2000)
15- 16 I2 min RAm Right ascension (J2000)
18- 22 F5.2 s RAs Right ascension (J2000)
24 A1 --- DE- Declination sign (J2000)
25- 26 I2 deg DEd Declination (J2000)
28- 29 I2 arcmin DEm Declination (J2000)
31- 35 F5.2 arcsec DEs Declination (J2000)
37- 41 F5.2 mag Imag I magnitude
43- 47 F5.2 mag Hmag H magnitude
49- 54 A6 --- Inst Instrument
56- 61 F6.4 --- z ?=- Redshift
63- 64 A2 --- q_z Redshift quality flag (G1)
66- 71 A6 --- Type Nature of the object
73- 86 A14 --- Com Comments
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Note (1): IDs prefixed with an 'I' (lower part of table) are objects selected
using R-K>5.
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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 --- [DBE2005] Sequential number, NTT NNNN
12- 13 I2 h RAh Right ascension (J2000)
15- 16 I2 min RAm Right ascension (J2000)
18- 22 F5.2 s RAs Right ascension (J2000)
24 A1 --- DE- Declination sign (J2000)
25- 26 I2 deg DEd Declination (J2000)
28- 29 I2 arcmin DEm Declination (J2000)
31- 35 F5.2 arcsec DEs Declination (J2000)
37- 41 F5.2 mag Imag I magnitude
43- 47 F5.2 mag Hmag H magnitude
49- 52 F4.2 mag I-H I-H colour index
56- 61 F6.4 --- z ?=- Redshift
63- 64 A2 --- q_z Redshift quality flag (G1)
66- 71 A6 --- Type Nature of the object
73- 87 A15 --- Com Comments
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 A10 --- [DBE2005] Sequential number, SSA22 NNNN
12- 13 I2 h RAh Right ascension (J2000)
15- 16 I2 min RAm Right ascension (J2000)
18- 22 F5.2 s RAs Right ascension (J2000)
24 A1 --- DE- Declination sign (J2000)
25- 26 I2 deg DEd Declination (J2000)
28- 29 I2 arcmin DEm Declination (J2000)
31- 35 F5.2 arcsec DEs Declination (J2000)
37- 41 F5.2 mag Imag I magnitude
43- 47 F5.2 mag Hmag H magnitude
49 I1 --- Mask Mask number
56- 61 F6.4 --- z ?=- Redshift
63- 64 A2 --- q_z Redshift quality flag (G1)
66- 71 A6 --- Type Nature of the object
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Global notes
Note (G1): Quality flags as follows:
0 = fail
1 = uncertain
2 = probable
3 = secure
-1 = high z>1.4
6 = star
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History:
From electronic version of the journal
References:
McCarthy et al., Paper I 2001ApJ...560L.131M 2001ApJ...560L.131M, Cat. VII/228
Firth et al., Paper II 2002MNRAS.332..617F 2002MNRAS.332..617F, Cat. VII/228
Chen et al., Paper III 2002ApJ...570...54C 2002ApJ...570...54C, Cat. VII/228
Chen et al., Paper IV 2003ApJ...586..745C 2003ApJ...586..745C
(End) Patricia Vannier [CDS] 05-Jun-2006