Optical rotation curves of distant field galaxies: Keck results at redshifts to z ∼

Nicole P. Vogt, Duncan A. Forbes, Andrew C. Phillips, Caryl Gronwall, S. M. Faber, Garth D. Illingworth, David C. Koo

Research output: Contribution to journalArticle

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Abstract

Spatially resolved velocity profiles are presented for nine faint field galaxies in the redshift range 0.1 ≲ z ≲ 1, based on moderate-resolution spectroscopy obtained with the Keck 10 m telescope. These data were augmented with high-resolution Hubble Space Telescope images from WFPC2, which provided V and I photometry, galaxy type, orientation, and inclination. The effects of seeing, slit width, and slit misalignment with respect to galaxy major axis were modeled along with inclination for each source, in order to derive a maximum circular velocity from the observed rotation curve. The lowest redshift galaxy, though highly elongated, shows a distorted low-amplitude rotation curve that suggests a merger in progress seen perpendicular to the collision path. The remaining rotation curves appear similar to those of local galaxies in both form and amplitude, implying that some massive disks were in place at z ∼ 1. The key result is that the kinematics of these distant galaxies show evidence for only a modest increase in luminosity (ΔMR ≲ 0.6) compared to velocity-luminosity (Tully-Fisher) relations for local galaxies.

Original languageEnglish (US)
Pages (from-to)L15-L18
JournalAstrophysical Journal
Volume465
Issue number1 PART II
StatePublished - Jul 1 1996

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galaxies
curves
velocity profile
merger
inclination
kinematics
collision
slits
spectroscopy
luminosity
Tully-Fisher relation
Hubble Space Telescope
misalignment
photometry
velocity distribution
telescopes
collisions
high resolution
effect

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Vogt, N. P., Forbes, D. A., Phillips, A. C., Gronwall, C., Faber, S. M., Illingworth, G. D., & Koo, D. C. (1996). Optical rotation curves of distant field galaxies: Keck results at redshifts to z ∼. Astrophysical Journal, 465(1 PART II), L15-L18.
Vogt, Nicole P. ; Forbes, Duncan A. ; Phillips, Andrew C. ; Gronwall, Caryl ; Faber, S. M. ; Illingworth, Garth D. ; Koo, David C. / Optical rotation curves of distant field galaxies : Keck results at redshifts to z ∼. In: Astrophysical Journal. 1996 ; Vol. 465, No. 1 PART II. pp. L15-L18.
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Vogt, NP, Forbes, DA, Phillips, AC, Gronwall, C, Faber, SM, Illingworth, GD & Koo, DC 1996, 'Optical rotation curves of distant field galaxies: Keck results at redshifts to z ∼', Astrophysical Journal, vol. 465, no. 1 PART II, pp. L15-L18.

Optical rotation curves of distant field galaxies : Keck results at redshifts to z ∼. / Vogt, Nicole P.; Forbes, Duncan A.; Phillips, Andrew C.; Gronwall, Caryl; Faber, S. M.; Illingworth, Garth D.; Koo, David C.

In: Astrophysical Journal, Vol. 465, No. 1 PART II, 01.07.1996, p. L15-L18.

Research output: Contribution to journalArticle

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N2 - Spatially resolved velocity profiles are presented for nine faint field galaxies in the redshift range 0.1 ≲ z ≲ 1, based on moderate-resolution spectroscopy obtained with the Keck 10 m telescope. These data were augmented with high-resolution Hubble Space Telescope images from WFPC2, which provided V and I photometry, galaxy type, orientation, and inclination. The effects of seeing, slit width, and slit misalignment with respect to galaxy major axis were modeled along with inclination for each source, in order to derive a maximum circular velocity from the observed rotation curve. The lowest redshift galaxy, though highly elongated, shows a distorted low-amplitude rotation curve that suggests a merger in progress seen perpendicular to the collision path. The remaining rotation curves appear similar to those of local galaxies in both form and amplitude, implying that some massive disks were in place at z ∼ 1. The key result is that the kinematics of these distant galaxies show evidence for only a modest increase in luminosity (ΔMR ≲ 0.6) compared to velocity-luminosity (Tully-Fisher) relations for local galaxies.

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Vogt NP, Forbes DA, Phillips AC, Gronwall C, Faber SM, Illingworth GD et al. Optical rotation curves of distant field galaxies: Keck results at redshifts to z ∼. Astrophysical Journal. 1996 Jul 1;465(1 PART II):L15-L18.