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J/ApJS/94/461 The Hawai K-band survey. III. (Songaila+ 1994)
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The Hawai K-band survey. III. Spectroscopy of K < 20 galaxies.
Songaila A., Cowie L.L., Hu E.M., Gardner J.P.
<Astrophys. J. Suppl. Ser. 94, 461 (1994)>
=1994ApJS...94..461S
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ADC_Keywords: Galaxies, photometry ; Photometry, infrared ; Redshifts ;
Spectroscopy
Keywords: cosmology: observations - galaxies: distances and redshifts -
galaxies: evolution - infrared: galaxies - surveys
Abstract:
We present spectra and multicolor (B,I,K) data for near-infrared (K)
selected spatially complete magnitude limited (K<20) galaxy samples
from the Hawaii Survey. The redshift identification of the sample of
298 galaxies is substantially complete to a B magnitude of 26 and an I
magnitude of 22.5, and identification of observed galaxies ranges from
nearly 100% completeness at K<18 to ~70% completeness at K=19-20. We
note that many of the unidentified objects appear to be red (I-K)
objects which are flat in the optical and spectroscopically
featureless. Strengths of spectral-line features and breaks are
tabulated for the 262 galaxies with reasonably secure redshifts. The
measured redshifts nearly all fall at z<1, with the exception of a
compact absorption-line object at z=2.35. At K>=18, the redshift
distribution is well fitted by a model with no luminosity evolution,
implying that from the K-band Hubble diagram, the Hubble constant can
vary at most by 10% over the redshift range from z~0.025 to 0.25, and
that positive luminosity evolution at any significant level between
z=0 and z=1 is ruled out. However, the evolution of both the
emission-line strengths and the 4000{AA} break indicates that galaxies
were undergoing significantly more star formation at z=1 than at the
present time.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 46 298 Redshift catalog for all fields sorted by
K magnitude
table5.dat 44 10 Redshift distribution with K magnitude
table6.dat 61 298 Spectral features and breaks
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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- 3 I3 --- No Sequential number
4 A1 --- --- [-]
5- 7 A3 --- Note Original redshift (1)
9- 10 I2 --- Field Observed field number
12- 16 I5 arcsec xpos Offset of the galaxy form the field center in
x coordinate (East to the left)
18- 22 I5 arcsec ypos Offset of the galaxy form the field center in
y coordinate (North to the top)
24- 27 F4.1 mag Kmag K magnitude
29- 32 F4.1 mag Imag ? I magnitude
34- 37 F4.1 mag Bmag ? B magnitude
39- 44 F6.4 --- z ? Measured redshift
45 A1 --- u_z Uncertainty flag on z
46 A1 --- n_z [n] n: object not identified
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Note (1): Redshifts which are taken from the literature are marked by the
object number according to the following code:
LCG (Lilly, Cowie & Gardner, 1991ApJ...369...79L),
CSH (Cowie, Songaila, & Hu, 1991Natur.354..460C),
L (Lilly, 1993ApJ...411..501L),
C (Cowie et al., 1994ApJ...434..114C).
No spectra are given for these objects in Fig.3.
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 2 I2 mag Kmin Minimum K magnitude for K interval
4- 5 I2 mag Kmax Maximum K magnitude for K interval
7- 8 I2 --- NTot Number of total galaxies
10- 11 I2 --- NObs Number of spectroscopically observed galaxies
13- 14 I2 --- NID Number of identified galaxies
16- 20 F5.3 --- zmean Mean redshift of identified galaxies
22- 26 F5.3 --- e_zmean rms uncertainty on zmean
28- 32 F5.3 --- Zmed Median redshift of all observed galaxies
34- 38 F5.3 --- zmedl Lower median redshift error bar
40- 44 F5.3 --- zmedh Higher median redshift error bar
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Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- No Sequential number
5- 8 F4.1 mag Kmag K magnitude
10- 14 F5.3 --- z ? Redshift
15 A1 --- u_z Uncertainty flag on z
16 A1 --- n_z [n] n: no id
18- 20 F3.1 --- Break ? Strength of the 4000A break
22- 25 F4.1 --- Mg ? Mgb index
27- 31 F5.1 0.1nm Na ? NaD line rest frame equivalent width
33- 37 F5.1 0.1nm GBand ? G band rest frame equivalent width
39- 43 F5.1 0.1nm Halpha ? H{alpha} + [N II] complex rest frame equivalent
width
45- 48 F4.1 0.1nm Hbeta ? H{beta} line rest frame equivalent width
50- 54 F5.1 0.1nm [OII] ? [O II]{lambda}3727 rest frame equivalent width
56- 60 F5.1 0.1nm [OIII] ? [O III]{lambda}5007 rest frame equivalent width
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History: Prepared via OCR at CDS.
References:
Cowie et al., Paper I 1994ApJ...434..114C
Huang et al., Paper II 1997ApJ...476...12H
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(End) James Marcout, Patricia Bauer [CDS] 11-Jul-1997