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Title: HUBBLE SPACE TELESCOPE EMISSION-LINE GALAXIES AT z ∼ 2: THE MYSTERY OF NEON

Abstract

We use near-infrared grism spectroscopy from the Hubble Space Telescope to examine the strength of [Ne III] λ3869 relative to Hβ, [O II] λ3727, and [O III] λ5007 in 236 low-mass (7.5 ≲ log (M {sub *}/M {sub ☉}) ≲ 10.5) star-forming galaxies in the redshift range 1.90 < z < 2.35. By stacking the data by stellar mass, we show that the [Ne III]/[O II] ratios of the z ∼ 2 universe are marginally higher than those seen in a comparable set of local Sloan Digital Sky Survey galaxies, and that [Ne III]/[O III] is enhanced by ∼0.2 dex. We consider the possible explanations for this ∼4σ result, including higher oxygen depletion out of the gas phase, denser H II regions, higher production of {sup 22}Ne via Wolf-Rayet stars, and the existence of a larger population of X-ray obscured active galactic nuclei at z ∼ 2 compared to z ∼ 0. None of these simple scenarios, alone, are favored to explain the observed line ratios. We conclude by suggesting several avenues of future observations to further explore the mystery of enhanced [Ne III] emission.

Authors:
; ; ; ; ; ; ; ;  [1]
  1. Department of Astronomy and Astrophysics, The Pennsylvania State University, University Park, PA 16802 (United States)
Publication Date:
OSTI Identifier:
22364751
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 798; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; COMPARATIVE EVALUATIONS; EMISSION SPECTRA; EMISSION SPECTROSCOPY; GALAXIES; GALAXY NUCLEI; MASS; NEON IONS; OXYGEN; OXYGEN IONS; RED SHIFT; STAR EVOLUTION; TELESCOPES; UNIVERSE; WOLF-RAYET STARS; X RADIATION

Citation Formats

Zeimann, Gregory R., Ciardullo, Robin, Gebhardt, Henry, Gronwall, Caryl, Hagen, Alex, Trump, Jonathan R., Bridge, Joanna S., Luo, Bin, and Schneider, Donald P., E-mail: grzeimann@psu.edu. HUBBLE SPACE TELESCOPE EMISSION-LINE GALAXIES AT z ∼ 2: THE MYSTERY OF NEON. United States: N. p., 2015. Web. doi:10.1088/0004-637X/798/1/29.
Zeimann, Gregory R., Ciardullo, Robin, Gebhardt, Henry, Gronwall, Caryl, Hagen, Alex, Trump, Jonathan R., Bridge, Joanna S., Luo, Bin, & Schneider, Donald P., E-mail: grzeimann@psu.edu. HUBBLE SPACE TELESCOPE EMISSION-LINE GALAXIES AT z ∼ 2: THE MYSTERY OF NEON. United States. doi:10.1088/0004-637X/798/1/29.
Zeimann, Gregory R., Ciardullo, Robin, Gebhardt, Henry, Gronwall, Caryl, Hagen, Alex, Trump, Jonathan R., Bridge, Joanna S., Luo, Bin, and Schneider, Donald P., E-mail: grzeimann@psu.edu. Thu . "HUBBLE SPACE TELESCOPE EMISSION-LINE GALAXIES AT z ∼ 2: THE MYSTERY OF NEON". United States. doi:10.1088/0004-637X/798/1/29.
@article{osti_22364751,
title = {HUBBLE SPACE TELESCOPE EMISSION-LINE GALAXIES AT z ∼ 2: THE MYSTERY OF NEON},
author = {Zeimann, Gregory R. and Ciardullo, Robin and Gebhardt, Henry and Gronwall, Caryl and Hagen, Alex and Trump, Jonathan R. and Bridge, Joanna S. and Luo, Bin and Schneider, Donald P., E-mail: grzeimann@psu.edu},
abstractNote = {We use near-infrared grism spectroscopy from the Hubble Space Telescope to examine the strength of [Ne III] λ3869 relative to Hβ, [O II] λ3727, and [O III] λ5007 in 236 low-mass (7.5 ≲ log (M {sub *}/M {sub ☉}) ≲ 10.5) star-forming galaxies in the redshift range 1.90 < z < 2.35. By stacking the data by stellar mass, we show that the [Ne III]/[O II] ratios of the z ∼ 2 universe are marginally higher than those seen in a comparable set of local Sloan Digital Sky Survey galaxies, and that [Ne III]/[O III] is enhanced by ∼0.2 dex. We consider the possible explanations for this ∼4σ result, including higher oxygen depletion out of the gas phase, denser H II regions, higher production of {sup 22}Ne via Wolf-Rayet stars, and the existence of a larger population of X-ray obscured active galactic nuclei at z ∼ 2 compared to z ∼ 0. None of these simple scenarios, alone, are favored to explain the observed line ratios. We conclude by suggesting several avenues of future observations to further explore the mystery of enhanced [Ne III] emission.},
doi = {10.1088/0004-637X/798/1/29},
journal = {Astrophysical Journal},
number = 1,
volume = 798,
place = {United States},
year = {Thu Jan 01 00:00:00 EST 2015},
month = {Thu Jan 01 00:00:00 EST 2015}
}