Redshifts of Emission Line Objects in the Hubble Ultra Deep Field

Abstract

We present redshifts for 115 emission line objects in the Hubble Ultra Deep Field (HUDF) identified through the GRism ACS Program for Extragalactic Science (GRAPES) project using the slitless grism spectroscopy mode of the ACS Camera on the Hubble Space Telescope (HST). The sample was selected by an emission line search on all extracted 1-dimensional GRAPES spectra. We identify the emission lines using line wavelength ratios where multiple lines are detected in the grism wavelength range (5800A < lambda < 9600A), and using photometric redshift information where multiple lines are unavailable. We then derive redshifts using the identified lines. Our redshifts are accurate to delta(z) = 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 i_{AB}>25 mag). Such emission lines would likely remain undiscovered without our deep survey. The emission line objects fall into 3 categories: 1) Most are low to moderate redshift galaxies (0 < z < 2), including many actively star forming galaxies with strong HII regions; 2) 9 are high redshift (4 < z < 7) Lyman-alpha emitters; and 3) at least 3 are candidate AGNs.

30 pages, 5 figures. Accepted for publication in The Astronomical Journal

References in corpus (4)

• The Hubble Ultra Deep Field
• The GOODS-MUSIC sample: a multicolour catalog of near-IR selected galaxies in the GOODS-South field
• Ly Alpha Emitters at z=5.7 in the Subaru Deep Field
• The Great Observatories Origins Deep Survey VLT/FORS2 Spectroscopy in the GOODS-South Field: Part II

Cited by in corpus (31)

• 3D-HST: A wide-field grism spectroscopic survey with the Hubble Space Telescope
• The ALMA Spectroscopic Survey in the HUDF: CO luminosity functions and the molecular gas content of galaxies through cosmic history
• ALMA spectroscopic survey in the Hubble Ultra Deep Field: Continuum number counts, resolved 1.2-mm extragalactic background, and properties of the faintest dusty star forming galaxies
• HETDEX pilot survey for emission-line galaxies - I. Survey design, performance, and catalog
• Optical to mid-IR observations of Lyman-alpha galaxies at redshift 5 in the HUDF: a young and low mass population
• Properties of $z\sim 3-6$ Lyman Break Galaxies. II. Impact of nebular emission at high redshift
• Effects of Dust Geometry in Lyman Alpha Galaxies at z = 4.4
• The ALMA Spectroscopic Survey in the Hubble Ultra Deep Field: Evolution of the molecular gas in CO-selected galaxies
• The ALMA Spectroscopic Survey in the HUDF: The Cosmic Dust and Gas Mass Densities in Galaxies up to $z\sim 3$
• The ALMA Spectroscopic Survey in the Hubble Ultra Deep Field: The nature of the faintest dusty star-forming galaxies
• Morphologies of ~190,000 Galaxies at z=0-10 Revealed with HST Legacy Data. III. Continuum Profile and Size Evolution of Lya Emitters
• Emission-Line Galaxies from the HST PEARS Grism Survey I: The South Fields
• The Galaxy Luminosity Function at z~1 in the HUDF: Probing the Dwarf Population
• Spectroscopic Confirmation of Faint Lyman Break Galaxies at Redshifts Four and Five in the Hubble Ultra Deep Field
• Limits on Spacetime Foam
• Emission-Line Galaxies from the PEARS Hubble Ultra Deep Field: A 2-D Detection Method and First Results
• Deep Keck u-band imaging of the Hubble Ultra Deep Field: A catalog of z~3 Lyman Break Galaxies
• Hubble Space Telescope WFC3 Early Release Science: Emission-Line Galaxies from Infrared Grism Observations
• The Expected Detection of Dust Emission from High-Redshift Lyman Alpha Galaxies
• Spatially-resolved HST Grism Spectroscopy of a Lensed Emission Line Galaxy at z~1
• A Two-Dimensional Spectroscopic Study of Emission Line Galaxies in the Faint Infrared Grism Survey (FIGS) I: Detection Method and Catalog
• Spectroscopic Study of the HST/ACS PEARS Emission-Line Galaxies
• LINEAR: A Novel Algorithm for Reconstructing Slitless Spectroscopy from HST/WFC3
• Correlations between H$\alpha$ Equivalent Width and Galaxy Properties at $z=0.47$: Physical or Selection-driven?
• Emission line selected galaxies at $z=0.6-2$ in GOODS South: Stellar masses, SFRs, and large scale structure
• A Catalog of Emission-Line Galaxies from the Faint Infrared Grism Survey: Studying Environmental Influence on Star Formation
• Stellar properties of z ~ 1 Lyman-break galaxies from ACS slitless grism spectra
• Spitzer's View of the Candidate Cluster and Protocluster Catalog (CCPC)
• Emission Line Metallicities From The Faint Infrared Grism Survey and VLT/MUSE
• A comprehensive study of H$\alpha$ emitters at $z\sim$ 0.62 in the DAWN survey: the need for deep and wide regions
• Flux Cube Reconstruction from Slitless Spectroscopy