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J/AJ/134/169    Redshifts of UDF emission-line objects       (Xu+, 2007)

Redshifts of emission-line objects in the Hubble Ultra Deep Field. Xu C., Pirzkal N., Malhotra S., Rhoads J.E., Mobasher B., Daddi E., Gronwall C., Hathi N.P., Panagia N., Ferguson H.C., Koekemoer A.M., Kummel M., Moustakas L.A., Pasquali A., Di Serego Alighieri S., Vernet J., Walsh J.R., Windhorst R., Yan H. <Astron. J., 134, 169-178 (2007)> =2007AJ....134..169X
ADC_Keywords: Galaxy catalogs ; Redshifts Keywords: galaxies: formation - galaxies: high-redshift - galaxies: starburst Abstract: We present redshifts for 115 emission-line objects in the Hubble Ultra Deep Field identified through the Grism ACS Program for Extragalactic Science (GRAPES) project using the slitless grism spectroscopy mode of the Advanced Camera for Surveys on the Hubble Space Telescope (HST). The sample was selected by an emission-line search on all extracted one-dimensional GRAPES spectra. We identify the emission lines using line wavelength ratios where multiple lines are detected in the grism wavelength range (5800Å≲lambda≲9600Å), and using photometric redshift information where multiple lines are unavailable. We then derive redshifts using the identified lines. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 92 148 Emission Line Objects in UDF Field
See also: II/258 : Hubble Ultra Deep Field Catalog (UDF) (STScI, 2004) J/AJ/132/926 : Galaxies in the Hubble Ultra Deep Field (Coe+, 2006) J/AJ/132/1729 : Hubble Ultra Deep Field BVI-dropout sources (Beckwith+, 2006) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 5 I5 --- UDF The UDF identification number (1) 7 A1 --- f_UDF [axcde] Flag on UDF (2) 9- 18 F10.7 deg RAdeg Right Ascension in decimal degrees (J2000) 20- 30 F11.7 deg DEdeg Declination in decimal degrees (J2000) 32- 37 F6.3 mag imag ? The i band (F775W) AB magnitude 39- 44 F6.1 0.1nm lambda Line wavelength in Angstroms 46- 49 F4.1 0.1nm e_lambda Uncertainty in lambda (3) 51- 53 I3 zW/m2 Flux Measured line flux (4) 55- 60 F6.3 --- z ? Redshift 62- 92 A31 --- ID Line identification
Note (1): Negative numbers do no correspond to UDF (Cat. II/258) numbers. Note (2): Flags as follows: a = These objects were identified by the automatic line finding algorithm x = These objects are manually added into the emission line list c = Line flux and redshift for object 5225 are taken from Rhoads et al. (2004ApJ...611...59R) d = Object 8040 in the UDF catalog corresponds to two distinct catalog entries in an earlier GRAPES catalog, which likely correspond to a pair of HII regions in the same galaxy. The two regions were analyzed separately by "emlinecull", resulting in two table entries for this object. The total line flux for the object is approximately the sum of the two entries, while both have the same redshift within the uncertainties. e = Line identifications for object 9397 are based on comparison with the composite quasar spectra of Francis et al. (1991ApJ...373..465F) and vanden Berk et al. (2001AJ....122..549V). The redshift is based on the MgII line. Note (3): Wavelength errors are the formal uncertainty from a gaussian fit to the line. Based on comparison of GRAPES redshifts with VLT redshifts (see text), we estimate that a systematic error floor of ∼12Å should be applied when the quoted error is smaller. Note (4): in 10-18erg/cm2/s = 10-21W/m2. Fluxes quoted here are directly measured from the emission features falling within the grism extraction window. Because this window is often relatively narrow, we estimate that the total emission line flux of an object could exceed the tabulated fluxes by aperture correction factors in the range of ∼1.5 to ∼3.
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 22-Aug-2009
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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