3D-HST emission line galaxies at z ∼ 2: Discrepancies in the optical/UV star formation rates

Gregory R. Zeimann, Robin Ciardullo, Henry Gebhardt, Caryl Gronwall, Donald P. Schneider, Alex Hagen, Joanna S. Bridge, John Feldmeier, Jonathan R. Trump

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

We use Hubble Space Telescope near-IR grism spectroscopy to examine the Hβ line strengths of 260 star-forming galaxies in the redshift range 1.90 < z < 2.35. We show that at these epochs, the Hβ star formation rate (SFR) is a factor of ∼1.8 higher than what would be expected from the systems' rest-frame UV flux density, suggesting a shift in the standard conversion between these quantities and SFR. We demonstrate that at least part of this shift can be attributed to metallicity, as Hβ is more enhanced in systems with lower oxygen abundance. This offset must be considered when measuring the SFR history of the universe. We also show that the relation between stellar and nebular extinction in our z ∼ 2 sample is consistent with that observed in the local universe.

Original languageEnglish (US)
Article number113
JournalAstrophysical Journal
Volume790
Issue number2
DOIs
StatePublished - Aug 1 2014

Fingerprint

star formation rate
galaxies
universe
H lines
space use
shift
Hubble Space Telescope
metallicity
extinction
flux density
spectroscopy
time measurement
histories
stars
oxygen
history
rate

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Zeimann, Gregory R. ; Ciardullo, Robin ; Gebhardt, Henry ; Gronwall, Caryl ; Schneider, Donald P. ; Hagen, Alex ; Bridge, Joanna S. ; Feldmeier, John ; Trump, Jonathan R. / 3D-HST emission line galaxies at z ∼ 2 : Discrepancies in the optical/UV star formation rates. In: Astrophysical Journal. 2014 ; Vol. 790, No. 2.
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3D-HST emission line galaxies at z ∼ 2 : Discrepancies in the optical/UV star formation rates. / Zeimann, Gregory R.; Ciardullo, Robin; Gebhardt, Henry; Gronwall, Caryl; Schneider, Donald P.; Hagen, Alex; Bridge, Joanna S.; Feldmeier, John; Trump, Jonathan R.

In: Astrophysical Journal, Vol. 790, No. 2, 113, 01.08.2014.

Research output: Contribution to journalArticle

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T1 - 3D-HST emission line galaxies at z ∼ 2

T2 - Discrepancies in the optical/UV star formation rates

AU - Zeimann, Gregory R.

AU - Ciardullo, Robin

AU - Gebhardt, Henry

AU - Gronwall, Caryl

AU - Schneider, Donald P.

AU - Hagen, Alex

AU - Bridge, Joanna S.

AU - Feldmeier, John

AU - Trump, Jonathan R.

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AB - We use Hubble Space Telescope near-IR grism spectroscopy to examine the Hβ line strengths of 260 star-forming galaxies in the redshift range 1.90 < z < 2.35. We show that at these epochs, the Hβ star formation rate (SFR) is a factor of ∼1.8 higher than what would be expected from the systems' rest-frame UV flux density, suggesting a shift in the standard conversion between these quantities and SFR. We demonstrate that at least part of this shift can be attributed to metallicity, as Hβ is more enhanced in systems with lower oxygen abundance. This offset must be considered when measuring the SFR history of the universe. We also show that the relation between stellar and nebular extinction in our z ∼ 2 sample is consistent with that observed in the local universe.

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