J/ApJ/519/1 Lyman-break galaxies at z ≳ 4 (Steidel+, 1999)
Lyman-break galaxies at z ≳ 4 and the evolution of the ultraviolet
luminosity density at high redshift
Steidel C.C., Adelberger K.L., Giavalisco M., Dickinson M., Pettini M.
<Astrophys. J. 519, 1 (1999)>
=1999ApJ...519....1S 1999ApJ...519....1S
ADC_Keywords: Galaxies, photometry ; Redshifts ; Spectroscopy
Keywords: catalogs - galaxies: distances and redshifts - galaxies:
evolution - galaxies: statistics - galaxies: stellar content
Abstract:
We present initial results of a survey for star-forming galaxies in
the redshift range 3.8≲z≲4.5. This sample consists of a
photometric catalog of 244 galaxies culled from a total solid angle of
0.23deg2 to an apparent magnitude of IAB=25.0. Spectroscopic
redshifts in the range 3.61≲z≲4.81 have been obtained for 48 of
these galaxies; their median redshift is =4.13. Selecting these
galaxies in a manner entirely analogous to our large survey for
Lyman-break galaxies at smaller redshift (2.7≲z≲3.4) allows a
relatively clean differential comparison between the populations and
integrated luminosity density at these two cosmic epochs. Over the
same range of UV luminosity, the spectroscopic properties of the
galaxy samples at z∼4 and z∼3 are indistinguishable, as are the
luminosity function shapes and the total integrated UV luminosity
densities [ρUV(z=3)/ρUV(z=4)=1.1±0.3].
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 68 11 z≥4 Lyman-break galaxy fields
table2.dat 73 73 Lyman-break candidate spectroscopic results
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 12 A12 --- Field Field name
15- 16 I2 h RAh ? Right Ascension (J2000)
18- 19 I2 min RAm ? Right Ascension (J2000)
21- 24 F4.1 s RAs ? Right Ascension (J2000)
27 A1 --- DE- ? Declination (J2000)
28- 29 I2 deg DEd ? Declination (J2000)
31- 32 I2 arcmin DEm ? Declination (J2000)
34- 35 I2 arcsec DEs ? Declination (J2000)
37- 39 I3 arcsec-2 Area [40/828] Field Area
42- 44 I3 --- NCand [13/244] Number of candidates
47- 49 I3 --- AfterN Number of candidates after applying the
(R-I)≤0.6 and I≥2 3 criteria
52- 53 I2 --- SpecZ [2/48] Number of spectroscopic redshifts
of z∼4 galaxies
56- 57 I2 --- AfterS Number of spectroscopic redshifts after
application of addition color and magnitude
criteria
60- 61 I2 --- Inter Number of interloper galaxies (z≪4)
64- 65 I2 --- AfterI [0/12] Number of interloper galaxies after
applied criteria
68 A1 --- f_Field [t] Indicates row contains the totals for all
fields (no position for the totals)
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 16 A16 --- Name Object name (see table1.dat for field names)
19- 20 I2 h RAh Right Ascension (J2000)
22- 23 I2 min RAm Right Ascension (J2000)
25- 29 F5.2 s RAs Right Ascension (J2000)
32 A1 --- DE- Declination (J2000)
33- 34 I2 deg DEd Declination (J2000)
36- 37 I2 arcmin DEm Declination (J2000)
39- 42 F4.1 arcsec DEs Declination (J2000)
46- 50 F5.2 mag Imag [21/25] I band magnitude in the AB system of
Oke+ (1983ApJ...266..713O 1983ApJ...266..713O)
54- 58 F5.2 mag R-I [-0.5/1] (R-I) color in the AB system
60 A1 --- l_G-R Limit flag on R-I
61- 64 F4.2 mag G-R [2/4.01] (G-R) color in the AB system
66- 70 F5.3 --- z [0/4.815] Redshift
73 A1 --- n_Name [ci] Type of galaxy (1)
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Note (1): Code as follows:
c = spectroscopically confirmed z ≥ 4 galaxy
i = interloper galaxy
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History:
From ApJ electronic edition
References:
Oke, J. B., & Gunn, J. E. 1983, ApJ, 266, 713 (1983ApJ...266..713O 1983ApJ...266..713O)
(End) Greg Schwarz [AAS] 08-Mar-2000