The Hubble Space Telescope medium deep survey with the wide field and planetary camera. I. Methodology and results on the field near 3C 273

R. E. Griffiths, K. U. Ratnatunga, L. W. Neuschaefer, S. Casertano, M. Im, E. W. Wyckoff, R. S. Ellis, G. F. Gilmore, R. A W Elson, K. Glazebrook, D. J. Schade, Rogier Windhorst, P. C. Schmidtke, J. M. Gordon, S. M. Pascarelle, G. D. Illingworth, D. C. Koo, M. A. Bershady, D. A. Forbes, A. C. PhillipsR. F. Green, V. Sarajedini, J. P. Huchra, A. J. Tyson

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Abstract

We present results from the Medium Deep Survey (MDS), a Key Project using the Hubble Space Telescope. Wide Field Camera images of random fields have been taken in "parallel mode" with an effective resolution of 0″.2 FWHM in the V(F555W) and /(F785LP) filters. The exposures presented here were targeted on a field 6′ away from 3C 273, and resulted in ∼5 hr integration time in each filter. Detailed morphological structure is seen in galaxy images with total integrated magnitudes down to V ≃ 22.5 and I ∼ 21.5. Parameters are estimated that best fit the observed galaxy images, and 143 objects are identified (including 23 stars) in the field to a fainter limiting magnitude of I % 23.5. We outline the extragalactic goals of the HST Medium Deep Survey, summarize our basic data reduction procedures, and present number (magnitude) counts, a color-magnitude diagram for the field, surface brightness profiles for the brighter galaxies, and best-fit half-light radii for the fainter galaxies as a function of apparent magnitude. A median galaxy half-light radius of 0″.4 is measured, and the distribution of galaxy sizes versus magnitude is presented. We observe an apparent deficit of galaxies with half-light radii between ∼0″.6 and 1″.5, with respect to standard no-evolution or mild evolution cosmological models. An apparent excess of compact objects (half-light radii ∼0″.1) is also observed with respect to those models. Finally, we find a small excess in the number of faint galaxy pairs and groups with respect to a random low-redshift field sample.

Original languageEnglish (US)
Pages (from-to)67-82
Number of pages16
JournalAstrophysical Journal
Volume437
Issue number1
StatePublished - Dec 10 1994

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Hubble Space Telescope
near fields
cameras
methodology
galaxies
radii
filter
filters
color-magnitude diagram
data reduction
diagram
brightness
stars
profiles

Keywords

  • Cosmology: observations
  • Galaxies: fundamental parameters
  • Galaxies: photometry
  • Surveys

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

Griffiths, R. E., Ratnatunga, K. U., Neuschaefer, L. W., Casertano, S., Im, M., Wyckoff, E. W., ... Tyson, A. J. (1994). The Hubble Space Telescope medium deep survey with the wide field and planetary camera. I. Methodology and results on the field near 3C 273. Astrophysical Journal, 437(1), 67-82.

The Hubble Space Telescope medium deep survey with the wide field and planetary camera. I. Methodology and results on the field near 3C 273. / Griffiths, R. E.; Ratnatunga, K. U.; Neuschaefer, L. W.; Casertano, S.; Im, M.; Wyckoff, E. W.; Ellis, R. S.; Gilmore, G. F.; Elson, R. A W; Glazebrook, K.; Schade, D. J.; Windhorst, Rogier; Schmidtke, P. C.; Gordon, J. M.; Pascarelle, S. M.; Illingworth, G. D.; Koo, D. C.; Bershady, M. A.; Forbes, D. A.; Phillips, A. C.; Green, R. F.; Sarajedini, V.; Huchra, J. P.; Tyson, A. J.

In: Astrophysical Journal, Vol. 437, No. 1, 10.12.1994, p. 67-82.

Research output: Contribution to journalArticle

Griffiths, RE, Ratnatunga, KU, Neuschaefer, LW, Casertano, S, Im, M, Wyckoff, EW, Ellis, RS, Gilmore, GF, Elson, RAW, Glazebrook, K, Schade, DJ, Windhorst, R, Schmidtke, PC, Gordon, JM, Pascarelle, SM, Illingworth, GD, Koo, DC, Bershady, MA, Forbes, DA, Phillips, AC, Green, RF, Sarajedini, V, Huchra, JP & Tyson, AJ 1994, 'The Hubble Space Telescope medium deep survey with the wide field and planetary camera. I. Methodology and results on the field near 3C 273', Astrophysical Journal, vol. 437, no. 1, pp. 67-82.
Griffiths RE, Ratnatunga KU, Neuschaefer LW, Casertano S, Im M, Wyckoff EW et al. The Hubble Space Telescope medium deep survey with the wide field and planetary camera. I. Methodology and results on the field near 3C 273. Astrophysical Journal. 1994 Dec 10;437(1):67-82.
Griffiths, R. E. ; Ratnatunga, K. U. ; Neuschaefer, L. W. ; Casertano, S. ; Im, M. ; Wyckoff, E. W. ; Ellis, R. S. ; Gilmore, G. F. ; Elson, R. A W ; Glazebrook, K. ; Schade, D. J. ; Windhorst, Rogier ; Schmidtke, P. C. ; Gordon, J. M. ; Pascarelle, S. M. ; Illingworth, G. D. ; Koo, D. C. ; Bershady, M. A. ; Forbes, D. A. ; Phillips, A. C. ; Green, R. F. ; Sarajedini, V. ; Huchra, J. P. ; Tyson, A. J. / The Hubble Space Telescope medium deep survey with the wide field and planetary camera. I. Methodology and results on the field near 3C 273. In: Astrophysical Journal. 1994 ; Vol. 437, No. 1. pp. 67-82.
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AU - Griffiths, R. E.

AU - Ratnatunga, K. U.

AU - Neuschaefer, L. W.

AU - Casertano, S.

AU - Im, M.

AU - Wyckoff, E. W.

AU - Ellis, R. S.

AU - Gilmore, G. F.

AU - Elson, R. A W

AU - Glazebrook, K.

AU - Schade, D. J.

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AU - Koo, D. C.

AU - Bershady, M. A.

AU - Forbes, D. A.

AU - Phillips, A. C.

AU - Green, R. F.

AU - Sarajedini, V.

AU - Huchra, J. P.

AU - Tyson, A. J.

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N2 - We present results from the Medium Deep Survey (MDS), a Key Project using the Hubble Space Telescope. Wide Field Camera images of random fields have been taken in "parallel mode" with an effective resolution of 0″.2 FWHM in the V(F555W) and /(F785LP) filters. The exposures presented here were targeted on a field 6′ away from 3C 273, and resulted in ∼5 hr integration time in each filter. Detailed morphological structure is seen in galaxy images with total integrated magnitudes down to V ≃ 22.5 and I ∼ 21.5. Parameters are estimated that best fit the observed galaxy images, and 143 objects are identified (including 23 stars) in the field to a fainter limiting magnitude of I % 23.5. We outline the extragalactic goals of the HST Medium Deep Survey, summarize our basic data reduction procedures, and present number (magnitude) counts, a color-magnitude diagram for the field, surface brightness profiles for the brighter galaxies, and best-fit half-light radii for the fainter galaxies as a function of apparent magnitude. A median galaxy half-light radius of 0″.4 is measured, and the distribution of galaxy sizes versus magnitude is presented. We observe an apparent deficit of galaxies with half-light radii between ∼0″.6 and 1″.5, with respect to standard no-evolution or mild evolution cosmological models. An apparent excess of compact objects (half-light radii ∼0″.1) is also observed with respect to those models. Finally, we find a small excess in the number of faint galaxy pairs and groups with respect to a random low-redshift field sample.

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