AAS 201st Meeting, January, 2003
Session 42. Galaxies and Clusters
Poster, Tuesday, January 7, 2003, 9:20am-6:30pm, Exhibit Hall AB

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[42.06] ACS grism spectra in the HDF-North

G.R. Meurer, Z.I. Tsvetanov (JHU), C. Gronwall (Pennsylvania State Univ.), N. Benitez (JHU), M. Franx (Leiden Obs.), J.P. Blakeslee, N. Cross, H.C. Ford, A.R. Martel, H.D. Tran (JHU), G.D. Illingworth (UCO/Lick Obs.), M. Clampin, M. Postman (STScI), T. Allen, K. Anderson, D.R. Ardila, P.D. Feldman, D.A. Golimowski, Wm.J. McCann, F. Menanteau, M. Sirianni, W. Zheng (JHU), R.A. Brown, C. Burrows, G. Hartig, J. Krist, W.B. Sparks, R.L. White (STScI), E. Cheng, R.A. Kimble, D. Campbell, P. Sullivan (GSFC), R. Bouwens, D. Magee (UCO/Lick Obs.), F. Bartko (Bartko Sci. & Tech.), T.J. Broadhurst (Racah Inst. Physics, Hebrew U.)), L. Infante (Pontificia Univ. Catolica de Chile), M. Lesser (Steward Obs.), G. Miley (Leiden Obs.), P. Rosati (ESO), P. Volmer (Ball Aerospace), M. Rafal (NRAO), R.A. Woodruff (Boeing)

We present slitless spectra of sources in the Hubble Deep Field North obtained with the Advanced Camera for Surveys. The Wide Field Camera was used to obtain dithered observations with a total exposure of 6700s (3 orbits) with the G800L grism. We concentrate on objects with published redshifts obtained spectroscopically and photometrically. In addition, we use a semi-automated technique to identify sources with emission line spectra, and those with broad stellar features. Sources with emission lines having a peak S/N > 4, have a median m\rm F775W = 24.6 ABmag. This is 1.5 mag fainter than the median m\rm F775W of objects in the Cohen et al. (2000, ApJ, 538, 29) spectroscopic redshift survey, illustrating that the G800L is a potentially useful tool for obtaining spectroscopic data of faint compact sources.

ACS was developed under NASA contract NAS 5-32865, and this research is supported by NASA grant NAG5-7697. We are grateful for an equipment grant from the Sun Microsystems, Inc.

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