J/ApJ/600/L99 Colours of z∼6 galaxies in GOODS (Dickinson+, 2004)
Color-selected galaxies at z∼6 in the Great Observatories Origins Deep Survey.
Dickinson M., Stern D., Giavalisco M., Ferguson H.C., Tsvetanov Z.,
Chornock R., Cristiani S., Dawson S., Dey A., Filippenko A.V.,
Moustakas L.A., Nonino M., Papovich C., Ravindranath S., Riess A.,
Rosati P., Spinrad H., Vanzella E.
<Astrophys. J., 600, L99-L102 (2004)>
=2004ApJ...600L..99D 2004ApJ...600L..99D
ADC_Keywords: Galaxies, photometry ; Surveys
Mission_Name: GOODS
Keywords: early universe - galaxies: evolution - galaxies: formation -
galaxies: high-redshift
Abstract:
We report early results on galaxies at z∼6 selected from Hubble Space
Telescope imaging for the Great Observatories Origins Deep Survey.
Spectroscopy of one object with the Advanced Camera for Surveys grism
and from the Keck and Very Large Telescope observatories shows a
strong continuum break and asymmetric line emission, identified as
Lyα at z=5.83. We find only five spatially extended candidates
with signal-to-noise ratios greater than 10, two of which have
spectroscopic confirmation. This is much fewer than would be expected
if galaxies at z=6 had the same luminosity function as those at z=3.
There are many fainter candidates, but we expect substantial
contamination from foreground interlopers and spurious detections. Our
best estimates favor a z=6 galaxy population with fainter
luminosities, higher space density, and similar comoving ultraviolet
emissivity to that at z=3, but this depends critically on counts at
fluxes fainter than those reliably probed by the current data.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 125 251 z∼6 galaxy candidates, ordered by S/N
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See also:
J/ApJ/600/L155 : Gravitational lens in GOODS ACS fields (Fassnacht+, 2004)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- [DSG2004] Galaxy candidate identification
8- 9 I2 h RAh Hour of Right Ascension (J2000)
11- 12 I2 min RAm Minute of Right Ascension (J2000)
14- 18 F5.2 s RAs Second of Right Ascension (J2000)
20 A1 --- DE- Sign of the Declination (J2000)
21- 22 I2 deg DEd Degree of Declination (J2000)
24- 25 I2 arcmin DEm Arcminute of Declination (J2000)
27- 30 F4.1 arcsec DEs Arcsecond of Declination (J2000)
32- 36 F5.2 --- S/N The F850LP band signal-to-noise (1)
38- 42 F5.2 mag Zmag The F850LP band magnitude
44- 47 F4.2 mag e_Zmag Error in Zmag
49 A1 --- l_I-Z The 2σ limit on I-Z
51- 54 F4.2 mag I-Z The I-Z (F775W-F850LP) color index
56- 59 F4.2 mag e_I-Z ? Error in I-Z
61- 64 F4.2 arcsec FWHM The F850LP band FWHM
66-125 A60 --- n_[DSG2004] Additional notes on galaxies
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Note (1): The robust sample is that with S/N>10. Objects with S/N<10
should be regarded with caution, and may include spurious contaminants
(see text).
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 13-Feb-2004