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Emission-Line Galaxies from the NICMOS/Hubble Space Telescope Grism Parallel Survey

McCarthy, Patrick J. and Yan, Lin and Freudling, Wolfram and Teplitz, Harry I. and Malumuth, Eliot M. and Weymann, Ray J. and Malkan, Matthew A. and Fosbury, Robert A. E. and Gardner, Jonathan P. and Storrie-Lombardi, Lisa J. and Thompson, Rodger I. and Williams, Robert E. and Heap, Sara R. (1999) Emission-Line Galaxies from the NICMOS/Hubble Space Telescope Grism Parallel Survey. Astrophysical Journal, 520 (2). pp. 548-563. ISSN 0004-637X. doi:10.1086/307491.

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We present the first results of a survey of random fields with the slitless G141 (λ_c = 1.5 μm, Δλ = 0.8 μm) grism on the near-IR camera and multiobject spectrometer (NICMOS) on board the Hubble Space Telescope (HST). Approximately 64 arcmin^2 have been observed at intermediate and high Galactic latitudes. The 3 σ limiting line and continuum fluxes in each field vary from 7.5 × 10^(-17) to 1 × 10^(-17) ergs cm^(-2) s^(-1), and from H = 20 to 22, respectively. Our median and area-weighted 3 σ limiting line fluxes within a 4 pixel aperture are nearly identical at 4.1 × 10^(-17) ergs cm^(-2) s^(-1) and are 60% deeper than the deepest narrowband imaging surveys from the ground. We have identified 33 emission-line objects and derive their observed wavelengths, fluxes, and equivalent widths. We argue that the most likely line identification is Hα and that the redshift range probed is from 0.75 to 1.9. The 2 σ rest-frame equivalent width limits range from 9 to 130 Å, with an average of 40 Å. The survey probes an effective comoving volume of 10^5 h^(-3)_50 Mpc^3 for q_0 = 0.5. Our derived comoving number density of emission-line galaxies in the range 0.7 < z < 1.9 is 3.3 × 10^(-4) h^3_(50) Mpc^(-3), very similar to that of the bright Lyman break objects at z ~ 3. The objects with detected emission lines have a median F160W magnitude of 20.4 (Vega scale) and a median Hα luminosity of 2.7 × 10^(42) ergs s^(-1). The implied star formation rates range from 1 to 324 M_☉ yr^(-1), with an average [N II] λλ6583, 6548 corrected rate of 21 M_☉ yr^(-1) for H_0 = 50 km s^(-1) Mpc and q_0 = 0.5 (34 M_☉ yr^(-1) for q_0 = 0.1).

Item Type:Article
Related URLs:
URLURL TypeDescription
Yan, Lin0000-0003-1710-9339
Teplitz, Harry I.0000-0002-7064-5424
Malkan, Matthew A.0000-0001-6919-1237
Storrie-Lombardi, Lisa J.0000-0002-5987-5210
Additional Information:© 1999. The American Astronomical Society. Received 1998 December 10; accepted 1999 March 11. We thank the staff of the Space Telescope Science Institute for their efforts in making this parallel program possible. In particular we thank Peg Stanley, Doug van Orsow, and the staff of the PRESTO division. We also thank John Mackenty and members of the STScI NICMOS group for crafting the exposure sequences, and we acknowledge the role of Duccio Macchetto and the Parallel Working Group, led by Jay Frogel, in making the public parallel program a success. This research was supported in part by grants from the Space Telescope Science Institute, GO-7498.01-96A and P423101. H. I. T. and J. P. G. acknowledge funding by the Space Telescope Imaging Spectrograph Instrument Definition Team through the National Optical Astronomy Observatories and by the NASA Goddard Space Flight Center.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Space Telescope Imaging Spectrograph Instrument Definition TeamUNSPECIFIED
NASA Goddard Space Flight CenterUNSPECIFIED
Subject Keywords: galaxies: distances and redshifts; galaxies: Seyfert; galaxies: statistics; infrared: galaxies; surveys
Issue or Number:2
Record Number:CaltechAUTHORS:20170321-144413239
Persistent URL:
Official Citation:Patrick J. McCarthy et al 1999 ApJ 520 548
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:75284
Deposited By: George Porter
Deposited On:22 Mar 2017 14:32
Last Modified:15 Nov 2021 16:32

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