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Emission-Line Galaxies from the NICMOS/HST GRISM Parallel Survey | P.J. McCarthy
; L. Yan
; W. Freudling
; H. Teplitz
; E. Malumuth
; R. Weymann
; M. Malkan
; R. Fosbury
; J.Gardner
; L. Storrie-Lombardi
; R. Thompson
; R. Williams
; S. Heap
; | Date: |
25 Feb 1999 | Subject: | astro-ph | Affiliation: | OCIW), W. Freudling (ECF/ESO), H. Teplitz, E. Malumuth (NASA), R. Weymann(OCIW), M. Malkan (UCLA), R. Fosbury (ECF/ESO), J.Gardner(NASA), L. Storrie-Lombardi(OCIW), R. Thompson(U. Arizona), R. Williams (STScI), S. Heap(NASA | Abstract: | We present the first results of a survey of random fields with the slitless G141 ($lambda_c = 1.5mu, Deltalambda=0.8mu$) grism on NICMOS. Approximately 64 square arcminutes have been observed at intermediate and high galactic latitudes. The 3$sigma$ limiting line and continuum fluxes in each field vary from $7.5 imes 10^{-17}$ to $1 imes 10^{-17} erg/cm^2/sec$ and from H = 20 to 22, respectively. Our median and area weighted $3sigma $ limiting line fluxes within a 4 pixel aperture are nearly identical at $4.1 imes 10^{-17} erg/cm^2/sec$ and are 60% deeper than the deepest narrow-band 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 H$alpha$ and that the redshift range probed is from 0.75 to 1.9. The 2$sigma$ rest-frame equivalent width limits range from 9AA to 130AA with an average of 40AA. The survey probes an effective co-moving volume of $10^5 h_{50}^{-3} Mpc^3$ for $q_0=0.5$. Our derived co-moving number density of emission line galaxies in the range $0.7 < z < 1.9$ is $3.3 imes10^{-4} h_{50}^{3} Mpc^{-3}$, very similar to that of the bright Lyman break objects at $z sim 3$. The objects with detected emission-lines have a median F160W magnitude of 20.4 (Vega scale) and a median H$alpha$ luminosity of $2.7 imes 10^{42} erg/sec$. The implied star formation rates range from 1 to 324 M_{odot}/yr, with an average [NII]6583,6548 corrected rate of 21 M_{odot}/yr for H_0=50 km/s/Mpc and $q_0=0.5$ (34 M_{odot}/yr for $q_0=0.1$). | Source: | arXiv, astro-ph/9902347 | Services: | Forum | Review | PDF | Favorites |
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