HST EMISSION LINE GALAXIES at z ∼ 2: COMPARING PHYSICAL PROPERTIES of LYMAN ALPHA and OPTICAL EMISSION LINE SELECTED GALAXIES

Alex Hagen, Gregory R. Zeimann, Christoph Behrens, Robin Bruce Ciardullo, Henry S.Grasshorn Gebhardt, Caryl Ann Gronwall, Joanna S. Bridge, Derek Brindley Fox, Donald P. Schneider, Jonathan R. Trump, Guillermo A. Blanc, Yi Kuan Chiang, Taylor S. Chonis, Steven L. Finkelstein, Gary J. Hill, Shardha Jogee, Eric Gawiser

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Abstract

We compare the physical and morphological properties of z ∼ 2 Lyα emitting galaxies (LAEs) identified in the HETDEX Pilot Survey and narrow band studies with those of z ∼ 2 optical emission line selected galaxies (oELGs) identified via HST WFC3 infrared grism spectroscopy. Both sets of galaxies extend over the same range in stellar mass (7.5 < logM/M⊙ < 10.5), size (0.5 < R < 3.0 kpc), and star formation rate (∼1 < SFR < 100 M⊙ yr?1). Remarkably, a comparison of the most commonly used physical and morphological parameters - stellar mass, half-light radius, UV slope, SFR, ellipticity, nearest neighbor distance, star formation surface density, specific SFR, [O iii] luminosity, and [O iii] equivalent width - reveals no statistically significant differences between the populations. This suggests that the processes and conditions which regulate the escape of Lyα from a z ∼ 2 star-forming galaxy do not depend on these quantities. In particular, the lack of dependence on the UV slope suggests that Lyα emission is not being significantly modulated by diffuse dust in the interstellar medium. We develop a simple model of Lyα emission that connects LAEs to all high-redshift star-forming galaxies where the escape of Lyα depends on the sightline through the galaxy. Using this model, we find that mean solid angle for Lyα escape is steradians; this value is consistent with those calculated from other studies.

Original languageEnglish (US)
Article number79
JournalAstrophysical Journal
Volume817
Issue number1
DOIs
StatePublished - Jan 20 2016

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light emission
physical property
physical properties
galaxies
escape
stellar mass
infrared spectroscopy
slopes
dust
stars
ellipticity
star formation rate
narrowband
star formation
luminosity
radii
comparison
rate
parameter

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Hagen, Alex ; Zeimann, Gregory R. ; Behrens, Christoph ; Ciardullo, Robin Bruce ; Gebhardt, Henry S.Grasshorn ; Gronwall, Caryl Ann ; Bridge, Joanna S. ; Fox, Derek Brindley ; Schneider, Donald P. ; Trump, Jonathan R. ; Blanc, Guillermo A. ; Chiang, Yi Kuan ; Chonis, Taylor S. ; Finkelstein, Steven L. ; Hill, Gary J. ; Jogee, Shardha ; Gawiser, Eric. / HST EMISSION LINE GALAXIES at z ∼ 2 : COMPARING PHYSICAL PROPERTIES of LYMAN ALPHA and OPTICAL EMISSION LINE SELECTED GALAXIES. In: Astrophysical Journal. 2016 ; Vol. 817, No. 1.
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title = "HST EMISSION LINE GALAXIES at z ∼ 2: COMPARING PHYSICAL PROPERTIES of LYMAN ALPHA and OPTICAL EMISSION LINE SELECTED GALAXIES",
abstract = "We compare the physical and morphological properties of z ∼ 2 Lyα emitting galaxies (LAEs) identified in the HETDEX Pilot Survey and narrow band studies with those of z ∼ 2 optical emission line selected galaxies (oELGs) identified via HST WFC3 infrared grism spectroscopy. Both sets of galaxies extend over the same range in stellar mass (7.5 < logM/M⊙ < 10.5), size (0.5 < R < 3.0 kpc), and star formation rate (∼1 < SFR < 100 M⊙ yr?1). Remarkably, a comparison of the most commonly used physical and morphological parameters - stellar mass, half-light radius, UV slope, SFR, ellipticity, nearest neighbor distance, star formation surface density, specific SFR, [O iii] luminosity, and [O iii] equivalent width - reveals no statistically significant differences between the populations. This suggests that the processes and conditions which regulate the escape of Lyα from a z ∼ 2 star-forming galaxy do not depend on these quantities. In particular, the lack of dependence on the UV slope suggests that Lyα emission is not being significantly modulated by diffuse dust in the interstellar medium. We develop a simple model of Lyα emission that connects LAEs to all high-redshift star-forming galaxies where the escape of Lyα depends on the sightline through the galaxy. Using this model, we find that mean solid angle for Lyα escape is steradians; this value is consistent with those calculated from other studies.",
author = "Alex Hagen and Zeimann, {Gregory R.} and Christoph Behrens and Ciardullo, {Robin Bruce} and Gebhardt, {Henry S.Grasshorn} and Gronwall, {Caryl Ann} and Bridge, {Joanna S.} and Fox, {Derek Brindley} and Schneider, {Donald P.} and Trump, {Jonathan R.} and Blanc, {Guillermo A.} and Chiang, {Yi Kuan} and Chonis, {Taylor S.} and Finkelstein, {Steven L.} and Hill, {Gary J.} and Shardha Jogee and Eric Gawiser",
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Hagen, A, Zeimann, GR, Behrens, C, Ciardullo, RB, Gebhardt, HSG, Gronwall, CA, Bridge, JS, Fox, DB, Schneider, DP, Trump, JR, Blanc, GA, Chiang, YK, Chonis, TS, Finkelstein, SL, Hill, GJ, Jogee, S & Gawiser, E 2016, 'HST EMISSION LINE GALAXIES at z ∼ 2: COMPARING PHYSICAL PROPERTIES of LYMAN ALPHA and OPTICAL EMISSION LINE SELECTED GALAXIES', Astrophysical Journal, vol. 817, no. 1, 79. https://doi.org/10.3847/0004-637X/817/1/79

HST EMISSION LINE GALAXIES at z ∼ 2 : COMPARING PHYSICAL PROPERTIES of LYMAN ALPHA and OPTICAL EMISSION LINE SELECTED GALAXIES. / Hagen, Alex; Zeimann, Gregory R.; Behrens, Christoph; Ciardullo, Robin Bruce; Gebhardt, Henry S.Grasshorn; Gronwall, Caryl Ann; Bridge, Joanna S.; Fox, Derek Brindley; Schneider, Donald P.; Trump, Jonathan R.; Blanc, Guillermo A.; Chiang, Yi Kuan; Chonis, Taylor S.; Finkelstein, Steven L.; Hill, Gary J.; Jogee, Shardha; Gawiser, Eric.

In: Astrophysical Journal, Vol. 817, No. 1, 79, 20.01.2016.

Research output: Contribution to journalArticle

TY - JOUR

T1 - HST EMISSION LINE GALAXIES at z ∼ 2

T2 - COMPARING PHYSICAL PROPERTIES of LYMAN ALPHA and OPTICAL EMISSION LINE SELECTED GALAXIES

AU - Hagen, Alex

AU - Zeimann, Gregory R.

AU - Behrens, Christoph

AU - Ciardullo, Robin Bruce

AU - Gebhardt, Henry S.Grasshorn

AU - Gronwall, Caryl Ann

AU - Bridge, Joanna S.

AU - Fox, Derek Brindley

AU - Schneider, Donald P.

AU - Trump, Jonathan R.

AU - Blanc, Guillermo A.

AU - Chiang, Yi Kuan

AU - Chonis, Taylor S.

AU - Finkelstein, Steven L.

AU - Hill, Gary J.

AU - Jogee, Shardha

AU - Gawiser, Eric

PY - 2016/1/20

Y1 - 2016/1/20

N2 - We compare the physical and morphological properties of z ∼ 2 Lyα emitting galaxies (LAEs) identified in the HETDEX Pilot Survey and narrow band studies with those of z ∼ 2 optical emission line selected galaxies (oELGs) identified via HST WFC3 infrared grism spectroscopy. Both sets of galaxies extend over the same range in stellar mass (7.5 < logM/M⊙ < 10.5), size (0.5 < R < 3.0 kpc), and star formation rate (∼1 < SFR < 100 M⊙ yr?1). Remarkably, a comparison of the most commonly used physical and morphological parameters - stellar mass, half-light radius, UV slope, SFR, ellipticity, nearest neighbor distance, star formation surface density, specific SFR, [O iii] luminosity, and [O iii] equivalent width - reveals no statistically significant differences between the populations. This suggests that the processes and conditions which regulate the escape of Lyα from a z ∼ 2 star-forming galaxy do not depend on these quantities. In particular, the lack of dependence on the UV slope suggests that Lyα emission is not being significantly modulated by diffuse dust in the interstellar medium. We develop a simple model of Lyα emission that connects LAEs to all high-redshift star-forming galaxies where the escape of Lyα depends on the sightline through the galaxy. Using this model, we find that mean solid angle for Lyα escape is steradians; this value is consistent with those calculated from other studies.

AB - We compare the physical and morphological properties of z ∼ 2 Lyα emitting galaxies (LAEs) identified in the HETDEX Pilot Survey and narrow band studies with those of z ∼ 2 optical emission line selected galaxies (oELGs) identified via HST WFC3 infrared grism spectroscopy. Both sets of galaxies extend over the same range in stellar mass (7.5 < logM/M⊙ < 10.5), size (0.5 < R < 3.0 kpc), and star formation rate (∼1 < SFR < 100 M⊙ yr?1). Remarkably, a comparison of the most commonly used physical and morphological parameters - stellar mass, half-light radius, UV slope, SFR, ellipticity, nearest neighbor distance, star formation surface density, specific SFR, [O iii] luminosity, and [O iii] equivalent width - reveals no statistically significant differences between the populations. This suggests that the processes and conditions which regulate the escape of Lyα from a z ∼ 2 star-forming galaxy do not depend on these quantities. In particular, the lack of dependence on the UV slope suggests that Lyα emission is not being significantly modulated by diffuse dust in the interstellar medium. We develop a simple model of Lyα emission that connects LAEs to all high-redshift star-forming galaxies where the escape of Lyα depends on the sightline through the galaxy. Using this model, we find that mean solid angle for Lyα escape is steradians; this value is consistent with those calculated from other studies.

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