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Studying the Evolution of Field Galaxies Using NICMOS/HST Parallel Imaging and Grism Data

Yan, L. and McCarthy, P. J. and Storrie-Lombardi, L. J. and Weymann, R. J. (1999) Studying the Evolution of Field Galaxies Using NICMOS/HST Parallel Imaging and Grism Data. In: Astrophysics with infrared surveys, a prelude to SIRTF. Astronomical Society of the Pacific Conference Series. No.177. Astronomical Society of the Pacific , San Francisco, CA, pp. 57-63. ISBN 1-58381-001-3.

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We present results from our analysis of F160W NICMOS Parallel images. These data cover ~9 sq. arcminutes and reach 3σ depths of H= 24.3 - 25.5 in a 0.6" diameter aperture with integration times of 2,000 to 13,000 seconds. We derive the first deep H band galaxy counts. The slope of the counts for H< 20 is 0.31, consistent with various K-band measurements from the Keck telescopes. The measured number counts vs. magnitude relation is reasonably well fitted with no-evolution models with a low Ω value. The half-light radii of the galaxies declines steeply with apparent magnitude and reaches the NIC3 resolution limit at H=23.5. Deep ground-based VRI imaging of one NICMOS field has revealed an extremely red galaxy with R-H = 6 and H of 18.8. Our analyses of the grism data show that we can reach 3σ flux limits of of 1 x 10^(-16) to 2 x 10^(-17) ergs/sec/cm^2 for integration times of 2,000 to 21,000 seconds. We have detected a total of 33 emission line galaxies. The comoving number density is ~2 x 10^(-4)Mpc^(-3). The detected emission lines are probably H_α 6563 Å. Thus, the derived star formation rates, without extinction correction, are 10 - 163M_⊙ per year for galaxies at redshifts between 0.7 and 1.9.

Item Type:Book Section
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Yan, L.0000-0003-1710-9339
Storrie-Lombardi, L. J.0000-0002-5987-5210
Additional Information:© 1999 Astronomical Society of the Pacific. Provided by the NASA Astrophysics Data System. We thank the NICMOS team at the Space Telescope Institute, and acknowledge useful discussions with B. McLeod, I. Smail, J. Gardner, H. Teplitz, R. Thompson, M. Rieke and David Hogg. This research is supported by grants from Space Telescope Science Institute, AR-07972.01-96A, GO-7499.01-96A and PO423101.
Group:Infrared Processing and Analysis Center (IPAC)
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Series Name:Astronomical Society of the Pacific Conference Series
Issue or Number:177
Record Number:CaltechAUTHORS:20170328-140903077
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:75485
Deposited By: Tony Diaz
Deposited On:28 Mar 2017 21:32
Last Modified:03 Oct 2019 16:50

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