A color analysis of the NICMOS parallel image archive

Michael R. Corbin, Earl O'Neil, Rodger I Thompson, Marcia J Rieke, Glenn Schneider

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

We present a photometric analysis of all high Galactic latitude (|b\ > 20°) broadband parallel images taken by the Near-Infrared Camera and Multi-Object Spectrometer instrument of the Hubble Space Telescope during its initial lifetime in HST Cycle 7. These images, taken through the F110W and F160W filters, reach a mean 3 σ limiting magnitude of approximately 22 in both bands, and cover a total area of approximately 92 arcmin2. The reddest of the 358 galaxies detected have F110W-F160W colors and F160W magnitudes consistent with being a combination of both dusty star-forming and evolved early-type galaxies at 1 ≲ z ≲ 2. The surface density of these galaxies is comparable to that of the population of extremely red objects (EROs) discovered in ground-based surveys ( ∼ 100 deg-2), suggesting that EROs also represent a combination of both galaxy types in this redshift range. Roughly 10% of the detected galaxies appear to be blue compact dwarf galaxies at z ≲ 1, a result consistent with studies of the HST Medium Deep Survey fields. The surface density of these objects down to a magnitude of 22 in F160W is ∼ 300 deg-2. None of the 631 point sources detected have F110W -F160W colors matching those expected for quasi-stellar objects (QSOs) whose continua have been significantly reddened by internal dust. Our data limit the surface density of such QSOs to be ≲, 50 deg-2 down to the mean limiting magnitudes of the sample images. Since the surface density of QSOs detected on the basis of ultraviolet excess in optical surveys to comparable depth is ∼ 100 deg-2, this argues against the suggestion that dust-reddened QSOs compose the undetected majority of the QSO population. The F110W-F160W color can also be used to identify unreddened QSOs at z ≳ 8, but we find no such candidates. This is consistent with the evidence that QSO space density declines sharply at z ≳ 5.

Original languageEnglish (US)
Pages (from-to)1209-1220
Number of pages12
JournalAstronomical Journal
Volume120
Issue number3
StatePublished - Sep 2000

Fingerprint

galaxies
color
dust
compact galaxies
space density
dwarf galaxies
Hubble Space Telescope
point sources
field survey
suggestion
point source
near infrared
spectrometer
cameras
analysis
spectrometers
continuums
broadband
filter
filters

Keywords

  • Cosmology: observations
  • Quasars: general
  • Surveys
  • Techniques: photometric

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Corbin, M. R., O'Neil, E., Thompson, R. I., Rieke, M. J., & Schneider, G. (2000). A color analysis of the NICMOS parallel image archive. Astronomical Journal, 120(3), 1209-1220.

A color analysis of the NICMOS parallel image archive. / Corbin, Michael R.; O'Neil, Earl; Thompson, Rodger I; Rieke, Marcia J; Schneider, Glenn.

In: Astronomical Journal, Vol. 120, No. 3, 09.2000, p. 1209-1220.

Research output: Contribution to journalArticle

Corbin, MR, O'Neil, E, Thompson, RI, Rieke, MJ & Schneider, G 2000, 'A color analysis of the NICMOS parallel image archive', Astronomical Journal, vol. 120, no. 3, pp. 1209-1220.
Corbin MR, O'Neil E, Thompson RI, Rieke MJ, Schneider G. A color analysis of the NICMOS parallel image archive. Astronomical Journal. 2000 Sep;120(3):1209-1220.
Corbin, Michael R. ; O'Neil, Earl ; Thompson, Rodger I ; Rieke, Marcia J ; Schneider, Glenn. / A color analysis of the NICMOS parallel image archive. In: Astronomical Journal. 2000 ; Vol. 120, No. 3. pp. 1209-1220.
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abstract = "We present a photometric analysis of all high Galactic latitude (|b\ > 20°) broadband parallel images taken by the Near-Infrared Camera and Multi-Object Spectrometer instrument of the Hubble Space Telescope during its initial lifetime in HST Cycle 7. These images, taken through the F110W and F160W filters, reach a mean 3 σ limiting magnitude of approximately 22 in both bands, and cover a total area of approximately 92 arcmin2. The reddest of the 358 galaxies detected have F110W-F160W colors and F160W magnitudes consistent with being a combination of both dusty star-forming and evolved early-type galaxies at 1 ≲ z ≲ 2. The surface density of these galaxies is comparable to that of the population of extremely red objects (EROs) discovered in ground-based surveys ( ∼ 100 deg-2), suggesting that EROs also represent a combination of both galaxy types in this redshift range. Roughly 10{\%} of the detected galaxies appear to be blue compact dwarf galaxies at z ≲ 1, a result consistent with studies of the HST Medium Deep Survey fields. The surface density of these objects down to a magnitude of 22 in F160W is ∼ 300 deg-2. None of the 631 point sources detected have F110W -F160W colors matching those expected for quasi-stellar objects (QSOs) whose continua have been significantly reddened by internal dust. Our data limit the surface density of such QSOs to be ≲, 50 deg-2 down to the mean limiting magnitudes of the sample images. Since the surface density of QSOs detected on the basis of ultraviolet excess in optical surveys to comparable depth is ∼ 100 deg-2, this argues against the suggestion that dust-reddened QSOs compose the undetected majority of the QSO population. The F110W-F160W color can also be used to identify unreddened QSOs at z ≳ 8, but we find no such candidates. This is consistent with the evidence that QSO space density declines sharply at z ≳ 5.",
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AB - We present a photometric analysis of all high Galactic latitude (|b\ > 20°) broadband parallel images taken by the Near-Infrared Camera and Multi-Object Spectrometer instrument of the Hubble Space Telescope during its initial lifetime in HST Cycle 7. These images, taken through the F110W and F160W filters, reach a mean 3 σ limiting magnitude of approximately 22 in both bands, and cover a total area of approximately 92 arcmin2. The reddest of the 358 galaxies detected have F110W-F160W colors and F160W magnitudes consistent with being a combination of both dusty star-forming and evolved early-type galaxies at 1 ≲ z ≲ 2. The surface density of these galaxies is comparable to that of the population of extremely red objects (EROs) discovered in ground-based surveys ( ∼ 100 deg-2), suggesting that EROs also represent a combination of both galaxy types in this redshift range. Roughly 10% of the detected galaxies appear to be blue compact dwarf galaxies at z ≲ 1, a result consistent with studies of the HST Medium Deep Survey fields. The surface density of these objects down to a magnitude of 22 in F160W is ∼ 300 deg-2. None of the 631 point sources detected have F110W -F160W colors matching those expected for quasi-stellar objects (QSOs) whose continua have been significantly reddened by internal dust. Our data limit the surface density of such QSOs to be ≲, 50 deg-2 down to the mean limiting magnitudes of the sample images. Since the surface density of QSOs detected on the basis of ultraviolet excess in optical surveys to comparable depth is ∼ 100 deg-2, this argues against the suggestion that dust-reddened QSOs compose the undetected majority of the QSO population. The F110W-F160W color can also be used to identify unreddened QSOs at z ≳ 8, but we find no such candidates. This is consistent with the evidence that QSO space density declines sharply at z ≳ 5.

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