SIMBAD references

2007AJ....134..169X - Astron. J., 134, 169-178 (2007/July-0)

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. and YAN H.

Abstract (from CDS):

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 (5800 Å≲λ≲9600 Å), and using photometric redshift information where multiple lines are unavailable. We then derive redshifts using the identified lines. Our redshifts are accurate to δz~0.009, based on both statistical uncertainty estimates and comparison with published ground-based spectra. Over 40% of our sample is fainter than typical magnitude limits for ground-based spectroscopy (with iAB>25 mag). Such emission lines would likely remain undiscovered without our deep survey. The emission-line objects fall into three categories: (1) most are low- to moderate-redshift galaxies (0≤z≤2), including many actively star-forming galaxies with strong H II regions; (2) nine are high-redshift (4≤z≤7) Lyα emitters; and (3) at least three are candidate active galactic nuclei.

Abstract Copyright:

Journal keyword(s): Galaxies: Formation - Galaxies: High-Redshift - Galaxies: Starburst

VizieR on-line data: <Available at CDS (J/AJ/134/169): table1.dat>

Nomenclature: Table 1: [XPM2007] -NNN N=12 among (Nos -110 to -1).

Simbad objects: 116

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