J/AJ/127/3137 Hawaii redshifts in the ACS-GOODS region (Cowie+, 2004)
A large sample of spectroscopic redshifts in the ACS-GOODS region of the
Hubble Deep Field North.
Cowie L.L., Barger A.J., Hu E.M., Capak P., Songaila A.
<Astron. J., 127, 3137-3145 (2004)>
=2004AJ....127.3137C 2004AJ....127.3137C
ADC_Keywords: Surveys ; Galaxies, photometry ; Photometry, UBVRI ; Redshifts
Keywords: cosmology: observations - early universe -
galaxies: distances and redshifts - galaxies: evolution -
galaxies: formation
Abstract:
We report the results of an extensive spectroscopic survey of galaxies
in the roughly 160 arcmin2 ACS-GOODS region surrounding the Hubble
Deep Field North (HDF-N). We have identified 892 galaxies or stars
with z<24, R<24.5, or B<25 in the region. The spectra were obtained
with either the DEIMOS or LRIS spectrographs on the Keck 10m
telescopes. The results are compared with photometric redshift
estimates and with redshifts from the literature, as well as with the
redshifts of a parallel effort led by a group at Keck. Our sample,
when combined with the literature data, provides identifications for
1324 sources. We use our results to determine the redshift
distributions with magnitude, to analyze the rest-frame color
distributions with redshift and spectral type, and to investigate the
dependence of the X-ray galaxy properties on the local galaxy density
in the redshift interval z=0-1.5. We find the rather surprising result
that the galaxy X-ray properties are not strongly dependent on the
local galaxy density for galaxies in the same luminosity range.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 45 1181 Hawaii redshifts in the ACS-GOODS region
table2.dat 81 1324 Spectroscopic redshifts from the Hawaii sample
and the literature
table3.dat 135 5737 Team Keck Treasury Redshift Survey (TKRS) Catalog
refs.dat 143 19 References
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See also:
II/261 : GOODS: Initial Results (Giavalisco+, 2005)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 10 F10.6 deg RAdeg Right Ascension in decimal degrees (J2000)
12- 19 F8.5 deg DEdeg Declination in decimal degrees (J2000)
21- 24 F4.1 mag z'mag ? The z' band AB magnitude
26- 29 F4.1 mag Rmag ? The R band AB magnitude
31- 35 F5.1 mag Bmag The B band AB magnitude (1)
37- 41 F5.3 --- z ? Spectroscopic redshift
43 A1 --- f_z [os] Flag on z (2)
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Note (1): Magnitudes which correspond to a negative flux are shown with a
negative sign in front of them.
Note (2): Note on redshift:
o = observed but could not be identified
s = star
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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- 10 F10.6 deg RAdeg Right Ascension in decimal degrees (J2000)
12- 19 F8.5 deg DEdeg Declination in decimal degrees (J2000)
21- 25 F5.1 mag HK'mag ? HK' AB magnitude (covers H and K' bands) (1)
27- 30 F4.1 mag z'mag ? The z' band AB magnitude (1)
32- 35 F4.1 mag Imag The I band AB magnitude (1)
37- 40 F4.1 mag Rmag ? The R band AB magnitude (1)
42- 46 F5.1 mag Vmag The V band AB magnitude (1)
48- 52 F5.1 mag Bmag The B band AB magnitude (1)
54- 58 F5.1 mag Umag The U band AB magnitude (1)
60- 65 F6.4 --- zspec ? Spectroscopic redshift
67 A1 --- f_zspec [s] Indicates object is a star
69 I1 --- r_zspec Source for zspec (2)
71- 74 A4 --- zphot ? Photometric redshift from
Capak et al. (2004, in prep.)
76 A1 --- f_zphot [s] Indicates object is a star
78- 81 F4.2 --- Odds [0/1]? Odds that the redshift lies close to
the estimated value (3)
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Note (1): From Capak et al. (2004, Cat. J/AJ/127/180)
Note (2): Source for zspec take the following values:
0 = DEIMOS redshift from the present paper
1 = LRIS redshift from the present paper
2 = Cal Tech redshift from Cohen et al. (1996, Cat. J/ApJ/471/L5,
2000, Cat. J/ApJ/538/29) or Cohen (2001, Cat. J/AJ/121/2895)
3 = Lick redshift from Phillips et al. (1997ApJ...489..543P 1997ApJ...489..543P) or
Lownethal et al. (1997ApJ...481..673L 1997ApJ...481..673L)
4 = redshift from Dawson et al. (2001, Cat. J/AJ/122/598)
5 = redshift from Steidel et al. (1996AJ....112..352S 1996AJ....112..352S,
2003, Cat. J/ApJ/592/728)
6 = redshift from Lowental et al. (1998, ASP Conf. Ser. 146, 110),
Liu et al. (1999AJ....118.1912L 1999AJ....118.1912L) or Dickinson (1998, in The
Hubble Deep Field, ed. M. Livio, S.M. Fall, & P. Madau
(New York: Cambridge Univ. Press), 219)
Note (3): We next compared the "total" sample of redshifts (from the Hawaii
observations and the literature) with the photometric redshift catalog
of Capak et al. (2004, in prep.). The photometric redshift estimates
are based on ultradeep imaging in seven colors from U to HK' (Capak et
al., 2004, J/AJ/127/180) and were computed using the Bayesian code
of Benitez (2000ApJ...536..571B 2000ApJ...536..571B). This code assigns odds that the
redshift lies close to the estimated value. We only use those cases in
which the odds lie above 90%.
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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- 5 I5 --- TKRS Serial number in Team Keck Survey,
7- 8 I2 h RAh DEIMOS Hour of Right Ascension (J2000)
10- 11 I2 min RAm DEIMOS Minute of Right Ascension (J2000)
13- 18 F6.3 s RAs DEIMOS Second of Right Ascension (J2000)
19 A1 --- DE- DEIMOS Sign of Declination (J2000)
20- 21 I2 deg DEd DEIMOS Degree of Declination (J2000)
23- 24 I2 arcmin DEm DEIMOS Arcminute of Declination (J2000)
26- 30 F5.2 arcsec DEs DEIMOS Arcsecond of Declination (J2000)
32- 36 F5.2 mag Rmag DEIMOS R band magnitude in AB system
38- 39 I2 --- Mask ? Mask number on which object was placed
41- 43 I3 --- Slit ? Slit number for object on TKRS mask
46- 53 F8.5 --- z ? Topocentric redshift measured by TKRS
55- 56 I2 --- q_z ? Redshift code assigned by TKRS (1)
58- 63 F6.4 --- zOther ? Alternate redshift from other works
65- 66 I2 --- r_zOther ? Source of alternate redshift, in refs.dat
68- 73 F6.1 pix XpixD X position on the DEIMOS mosaic image
75- 80 F6.1 pix YpixD Y position on the DEIMOS mosaic image
82- 83 I2 --- ACS Sector number in which the object lies on the
HST/ACS mosaic image (3)
85- 90 F6.1 pix XpixG X position on the HST/ACS mosaic image
92- 97 F6.1 pix YpixG Y position on the HST/ACS mosaic image
99-103 F5.3 arcsec MajAxis DEIMOS semi-major axis (4)
105-109 F5.3 --- ell DEIMOS ellipticity (4)
111-115 F5.1 deg PA [-180/180] DEIMOS major axis position angle (5)
117-136 A20 --- G-ID GOODS-N v1.0 catalog IAU identification (6)
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Note (1): Redshift code assigned by TKRS (Cat. J/AJ/127/3121) as follows:
-1 = star
1 = redshift unmeasurable
2 = redshift uncertain
3 = 90% confidence
4 = 99% confidence
Note (3): As shown in the figure made by the GOODS team at
ftp://archive.stsci.edu/pub/hlsp/goods/v1/h_hdfn_v1.0sects_plt.jpg
Note (4): Measured by SExtractor on DEIMOS mosaic image.
Note (5): Measured by SExtractor on DEIMOS mosaic image (North=0, East=+90).
Note (6): Of objects matching the DEIMOS catalogue from Giavalisco et al.
(2004ApJ...600L..93G 2004ApJ...600L..93G).
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Byte-by-byte Description of file: refs.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Ref Reference number
4- 22 A19 ---- BibCode BibCode
24- 39 A16 --- Aut Author's name
43-143 A101 --- Com Comments
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 03-Dec-2004