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The nature of extreme emission line galaxies at z=1-2 : kinematics and metallicities from near-infrared spectroscopy

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Abstract
We present near-infrared spectroscopy of a sample of 22 Extreme Emission Line Galaxies at redshifts 1.3 < z < 2.3, confirming that these are low-mass (M* = 108-109M(circle dot)) galaxies undergoing intense starburst episodes (M*/SFR similar to 10-100 Myr). The sample is selected by [O iii] or Ha emission line flux and equivalent width using near-infrared grism spectroscopy from the 3D-HST survey. High-resolution NIR spectroscopy is obtained with LBT/LUCI and VLT/X-SHOOTER. The [Oiii]/H line ratio is high (greater than or similar to 5) and [N ii]/Ha is always significantly below unity, which suggests a low gas-phase metallicity. We are able to determine gas-phase metallicities for seven of our objects using various strong-line methods, with values in the range 0.05-0.30 Z similar to and with a median of 0.15 Z similar to; for three of these objects we detect [O iii].4363, which allows for a direct constraint on the metallicity. The velocity dispersion, as measured from the nebular emission lines, is typically similar to 50 km s-1. Combined with the observed star-forming activity, the Jeans and Toomre stability criteria imply that the gas fraction must be large (fgas - 2/3), consistent with the difference between our dynamical and stellar mass estimates. The implied gas depletion timescale (several hundred Myr) is substantially longer than the inferred mass-weighted ages (similar to 50 Myr), which further supports the emerging picture that most stars in low-mass galaxies form in short, intense bursts of star formation.
Keywords
STAR-FORMING GALAXIES, ACTIVE GALACTIC NUCLEI, DIGITAL SKY SURVEY, HUBBLE-SPACE-TELESCOPE, GREATER-THAN 1, SIMILAR-TO 2, EXTRAGALACTIC, LEGACY SURVEY, HIGH-REDSHIFT GALAXIES, GREEN PEA GALAXIES, LOW-MASS, GALAXIES, galaxies: dwarf, galaxies: evolution, galaxies: formation, galaxies: high-redshift, galaxies: starburst

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MLA
Maseda, Michael V., et al. “The Nature of Extreme Emission Line Galaxies at Z=1-2 : Kinematics and Metallicities from near-Infrared Spectroscopy.” ASTROPHYSICAL JOURNAL, vol. 791, no. 1, 2014.
APA
Maseda, M. V., van der Wel, A., Rix, H.-W., da Cunha, E., Pacifici, C., Momcheva, I., … Whitaker, K. E. (2014). The nature of extreme emission line galaxies at z=1-2 : kinematics and metallicities from near-infrared spectroscopy. ASTROPHYSICAL JOURNAL, 791(1).
Chicago author-date
Maseda, Michael V, Arjen van der Wel, Hans-Walter Rix, Elisabete da Cunha, Camilla Pacifici, Ivelina Momcheva, Gabriel B Brammer, et al. 2014. “The Nature of Extreme Emission Line Galaxies at Z=1-2 : Kinematics and Metallicities from near-Infrared Spectroscopy.” ASTROPHYSICAL JOURNAL 791 (1).
Chicago author-date (all authors)
Maseda, Michael V, Arjen van der Wel, Hans-Walter Rix, Elisabete da Cunha, Camilla Pacifici, Ivelina Momcheva, Gabriel B Brammer, Sharon Meidt van der Wel, Marijn Franx, Pieter van Dokkum, Mattia Fumagalli, Eric F Bell, Henry C Ferguson, Natascha M Foerster-Schreiber, Anton M Koekemoer, David C Koo, Britt F Lundgren, Danilo Marchesini, Erica J Nelson, Shannon G Patel, Rosalind E Skelton, Amber N Straughn, Jonathan R Trump, and Katherine E Whitaker. 2014. “The Nature of Extreme Emission Line Galaxies at Z=1-2 : Kinematics and Metallicities from near-Infrared Spectroscopy.” ASTROPHYSICAL JOURNAL 791 (1).
Vancouver
1.
Maseda MV, van der Wel A, Rix H-W, da Cunha E, Pacifici C, Momcheva I, et al. The nature of extreme emission line galaxies at z=1-2 : kinematics and metallicities from near-infrared spectroscopy. ASTROPHYSICAL JOURNAL. 2014;791(1).
IEEE
[1]
M. V. Maseda et al., “The nature of extreme emission line galaxies at z=1-2 : kinematics and metallicities from near-infrared spectroscopy,” ASTROPHYSICAL JOURNAL, vol. 791, no. 1, 2014.
@article{8568270,
  abstract     = {We present near-infrared spectroscopy of a sample of 22 Extreme Emission Line Galaxies at redshifts 1.3 < z < 2.3, confirming that these are low-mass (M* = 108-109M(circle dot)) galaxies undergoing intense starburst episodes (M*/SFR similar to 10-100 Myr). The sample is selected by [O iii] or Ha emission line flux and equivalent width using near-infrared grism spectroscopy from the 3D-HST survey. High-resolution NIR spectroscopy is obtained with LBT/LUCI and VLT/X-SHOOTER. The [Oiii]/H line ratio is high (greater than or similar to 5) and [N ii]/Ha is always significantly below unity, which suggests a low gas-phase metallicity. We are able to determine gas-phase metallicities for seven of our objects using various strong-line methods, with values in the range 0.05-0.30 Z similar to and with a median of 0.15 Z similar to; for three of these objects we detect [O iii].4363, which allows for a direct constraint on the metallicity. The velocity dispersion, as measured from the nebular emission lines, is typically similar to 50 km s-1. Combined with the observed star-forming activity, the Jeans and Toomre stability criteria imply that the gas fraction must be large (fgas - 2/3), consistent with the difference between our dynamical and stellar mass estimates. The implied gas depletion timescale (several hundred Myr) is substantially longer than the inferred mass-weighted ages (similar to 50 Myr), which further supports the emerging picture that most stars in low-mass galaxies form in short, intense bursts of star formation.},
  articleno    = {17},
  author       = {Maseda, Michael V and van der Wel, Arjen and Rix, Hans-Walter and da Cunha, Elisabete and Pacifici, Camilla and Momcheva, Ivelina and Brammer, Gabriel B and van der Wel, Sharon Meidt and Franx, Marijn and van Dokkum, Pieter and Fumagalli, Mattia and Bell, Eric F and Ferguson, Henry C and Foerster-Schreiber, Natascha M and Koekemoer, Anton M and Koo, David C and Lundgren, Britt F and Marchesini, Danilo and Nelson, Erica J and Patel, Shannon G and Skelton, Rosalind E and Straughn, Amber N and Trump, Jonathan R and Whitaker, Katherine E},
  issn         = {0004-637X},
  journal      = {ASTROPHYSICAL JOURNAL},
  keywords     = {STAR-FORMING GALAXIES,ACTIVE GALACTIC NUCLEI,DIGITAL SKY SURVEY,HUBBLE-SPACE-TELESCOPE,GREATER-THAN 1,SIMILAR-TO 2,EXTRAGALACTIC,LEGACY SURVEY,HIGH-REDSHIFT GALAXIES,GREEN PEA GALAXIES,LOW-MASS,GALAXIES,galaxies: dwarf,galaxies: evolution,galaxies: formation,galaxies: high-redshift,galaxies: starburst},
  language     = {eng},
  number       = {1},
  pages        = {17},
  title        = {The nature of extreme emission line galaxies at z=1-2 : kinematics and metallicities from near-infrared spectroscopy},
  url          = {http://dx.doi.org/10.1088/0004-637X/791/1/17},
  volume       = {791},
  year         = {2014},
}

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