The inferred redshift distribution of the faint blue galaxy excess

Simon P. Driver, Warrick J. Couch, Steven Phillipps, Rogier Windhorst

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

We infer the redshift distribution of the faint blue galaxy excess (FEE) at mB = 23.5 by subtracting the predicted distribution of giant/normal galaxies from the observed N(z) distribution for all types. This is possible because of the recent deep Hubble Space Telescope (HST) WFPC2 morphological number counts that have convincingly demonstrated that little evolution of the giant population is seen to mB = 26.0. The mean redshift of the FBE at mB -23.5 is found to be 〈Z〉FBE= 0.40 ±0.07 with upper and lower quartiles defined by Z0.75 = 0.58 ±0.05 and z0.25 = 0.28 ±0.05, respectively. We compare this inferred FBE N(z) distribution to the predictions from three generic faint galaxy models: dwarf dominated (no-evolution), pure luminosity evolution, and evolving dwarfs. The inferred FEE N(z) distribution strongly supports a hybrid evolving dwarf-rich model wherein a large population of dwarfs present at z = 0.5 has subsequently faded to obscurity. The total integrated number density of dwarfs (down to MB = -11) is estimated to be a factor of 20 times greater than that of E-Sc galaxies and the estimated fading to be 1.0 < Δm < 1.4 mag. Thus, the dwarf population is estimated to be responsible for ∼30% of the luminosity density locally, rising to ∼57% at z = 0.5.

Original languageEnglish (US)
JournalAstrophysical Journal
Volume466
Issue number1 PART II
StatePublished - 1996

Fingerprint

galaxies
quartiles
luminosity
fading
Hubble Space Telescope
distribution
prediction
predictions

Keywords

  • Galaxies: Elliptical and lenticular, c
  • Galaxies: Evolution
  • Galaxies: Formation
  • Galaxies: Irregular
  • Galaxies: Spiral

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

Driver, S. P., Couch, W. J., Phillipps, S., & Windhorst, R. (1996). The inferred redshift distribution of the faint blue galaxy excess. Astrophysical Journal, 466(1 PART II).

The inferred redshift distribution of the faint blue galaxy excess. / Driver, Simon P.; Couch, Warrick J.; Phillipps, Steven; Windhorst, Rogier.

In: Astrophysical Journal, Vol. 466, No. 1 PART II, 1996.

Research output: Contribution to journalArticle

Driver, SP, Couch, WJ, Phillipps, S & Windhorst, R 1996, 'The inferred redshift distribution of the faint blue galaxy excess', Astrophysical Journal, vol. 466, no. 1 PART II.
Driver, Simon P. ; Couch, Warrick J. ; Phillipps, Steven ; Windhorst, Rogier. / The inferred redshift distribution of the faint blue galaxy excess. In: Astrophysical Journal. 1996 ; Vol. 466, No. 1 PART II.
@article{28c9aca05e1945caa2989990e652410b,
title = "The inferred redshift distribution of the faint blue galaxy excess",
abstract = "We infer the redshift distribution of the faint blue galaxy excess (FEE) at mB = 23.5 by subtracting the predicted distribution of giant/normal galaxies from the observed N(z) distribution for all types. This is possible because of the recent deep Hubble Space Telescope (HST) WFPC2 morphological number counts that have convincingly demonstrated that little evolution of the giant population is seen to mB = 26.0. The mean redshift of the FBE at mB -23.5 is found to be 〈Z〉FBE= 0.40 ±0.07 with upper and lower quartiles defined by Z0.75 = 0.58 ±0.05 and z0.25 = 0.28 ±0.05, respectively. We compare this inferred FBE N(z) distribution to the predictions from three generic faint galaxy models: dwarf dominated (no-evolution), pure luminosity evolution, and evolving dwarfs. The inferred FEE N(z) distribution strongly supports a hybrid evolving dwarf-rich model wherein a large population of dwarfs present at z = 0.5 has subsequently faded to obscurity. The total integrated number density of dwarfs (down to MB = -11) is estimated to be a factor of 20 times greater than that of E-Sc galaxies and the estimated fading to be 1.0 < Δm < 1.4 mag. Thus, the dwarf population is estimated to be responsible for ∼30{\%} of the luminosity density locally, rising to ∼57{\%} at z = 0.5.",
keywords = "Galaxies: Elliptical and lenticular, c, Galaxies: Evolution, Galaxies: Formation, Galaxies: Irregular, Galaxies: Spiral",
author = "Driver, {Simon P.} and Couch, {Warrick J.} and Steven Phillipps and Rogier Windhorst",
year = "1996",
language = "English (US)",
volume = "466",
journal = "Astrophysical Journal",
issn = "0004-637X",
publisher = "IOP Publishing Ltd.",
number = "1 PART II",

}

TY - JOUR

T1 - The inferred redshift distribution of the faint blue galaxy excess

AU - Driver, Simon P.

AU - Couch, Warrick J.

AU - Phillipps, Steven

AU - Windhorst, Rogier

PY - 1996

Y1 - 1996

N2 - We infer the redshift distribution of the faint blue galaxy excess (FEE) at mB = 23.5 by subtracting the predicted distribution of giant/normal galaxies from the observed N(z) distribution for all types. This is possible because of the recent deep Hubble Space Telescope (HST) WFPC2 morphological number counts that have convincingly demonstrated that little evolution of the giant population is seen to mB = 26.0. The mean redshift of the FBE at mB -23.5 is found to be 〈Z〉FBE= 0.40 ±0.07 with upper and lower quartiles defined by Z0.75 = 0.58 ±0.05 and z0.25 = 0.28 ±0.05, respectively. We compare this inferred FBE N(z) distribution to the predictions from three generic faint galaxy models: dwarf dominated (no-evolution), pure luminosity evolution, and evolving dwarfs. The inferred FEE N(z) distribution strongly supports a hybrid evolving dwarf-rich model wherein a large population of dwarfs present at z = 0.5 has subsequently faded to obscurity. The total integrated number density of dwarfs (down to MB = -11) is estimated to be a factor of 20 times greater than that of E-Sc galaxies and the estimated fading to be 1.0 < Δm < 1.4 mag. Thus, the dwarf population is estimated to be responsible for ∼30% of the luminosity density locally, rising to ∼57% at z = 0.5.

AB - We infer the redshift distribution of the faint blue galaxy excess (FEE) at mB = 23.5 by subtracting the predicted distribution of giant/normal galaxies from the observed N(z) distribution for all types. This is possible because of the recent deep Hubble Space Telescope (HST) WFPC2 morphological number counts that have convincingly demonstrated that little evolution of the giant population is seen to mB = 26.0. The mean redshift of the FBE at mB -23.5 is found to be 〈Z〉FBE= 0.40 ±0.07 with upper and lower quartiles defined by Z0.75 = 0.58 ±0.05 and z0.25 = 0.28 ±0.05, respectively. We compare this inferred FBE N(z) distribution to the predictions from three generic faint galaxy models: dwarf dominated (no-evolution), pure luminosity evolution, and evolving dwarfs. The inferred FEE N(z) distribution strongly supports a hybrid evolving dwarf-rich model wherein a large population of dwarfs present at z = 0.5 has subsequently faded to obscurity. The total integrated number density of dwarfs (down to MB = -11) is estimated to be a factor of 20 times greater than that of E-Sc galaxies and the estimated fading to be 1.0 < Δm < 1.4 mag. Thus, the dwarf population is estimated to be responsible for ∼30% of the luminosity density locally, rising to ∼57% at z = 0.5.

KW - Galaxies: Elliptical and lenticular, c

KW - Galaxies: Evolution

KW - Galaxies: Formation

KW - Galaxies: Irregular

KW - Galaxies: Spiral

UR - http://www.scopus.com/inward/record.url?scp=15444375728&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=15444375728&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:15444375728

VL - 466

JO - Astrophysical Journal

JF - Astrophysical Journal

SN - 0004-637X

IS - 1 PART II

ER -