High Equivalent Width of H alpha plus [N II] Emission in z similar to 8 Lyman-break Galaxies from IRAC 5.8 mu m Observations: Evidence for Efficient Lyman-continuum Photon Production in the Epoch of Reionization

Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt

Standard

High Equivalent Width of H alpha plus [N II] Emission in z similar to 8 Lyman-break Galaxies from IRAC 5.8 mu m Observations : Evidence for Efficient Lyman-continuum Photon Production in the Epoch of Reionization. / Stefanon, Mauro; Bouwens, Rychard J.; Illingworth, Garth D.; Labbe, Ivo; Oesch, Pascal A.; Gonzalez, Valentino.

I: Astrophysical Journal, Bind 935, Nr. 2, 94, 01.08.2022.

Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt

Harvard

Stefanon, M, Bouwens, RJ, Illingworth, GD, Labbe, I, Oesch, PA & Gonzalez, V 2022, 'High Equivalent Width of H alpha plus [N II] Emission in z similar to 8 Lyman-break Galaxies from IRAC 5.8 mu m Observations: Evidence for Efficient Lyman-continuum Photon Production in the Epoch of Reionization', Astrophysical Journal, bind 935, nr. 2, 94. https://doi.org/10.3847/1538-4357/ac7e44

APA

Stefanon, M., Bouwens, R. J., Illingworth, G. D., Labbe, I., Oesch, P. A., & Gonzalez, V. (2022). High Equivalent Width of H alpha plus [N II] Emission in z similar to 8 Lyman-break Galaxies from IRAC 5.8 mu m Observations: Evidence for Efficient Lyman-continuum Photon Production in the Epoch of Reionization. Astrophysical Journal, 935(2), [94]. https://doi.org/10.3847/1538-4357/ac7e44

Vancouver

Stefanon M, Bouwens RJ, Illingworth GD, Labbe I, Oesch PA, Gonzalez V. High Equivalent Width of H alpha plus [N II] Emission in z similar to 8 Lyman-break Galaxies from IRAC 5.8 mu m Observations: Evidence for Efficient Lyman-continuum Photon Production in the Epoch of Reionization. Astrophysical Journal. 2022 aug. 1;935(2). 94. https://doi.org/10.3847/1538-4357/ac7e44

Author

Stefanon, Mauro ; Bouwens, Rychard J. ; Illingworth, Garth D. ; Labbe, Ivo ; Oesch, Pascal A. ; Gonzalez, Valentino. / High Equivalent Width of H alpha plus [N II] Emission in z similar to 8 Lyman-break Galaxies from IRAC 5.8 mu m Observations : Evidence for Efficient Lyman-continuum Photon Production in the Epoch of Reionization. I: Astrophysical Journal. 2022 ; Bind 935, Nr. 2.

Bibtex

@article{e5aab871e67f4aaeb190a006c4196a30,
title = "High Equivalent Width of H alpha plus [N II] Emission in z similar to 8 Lyman-break Galaxies from IRAC 5.8 mu m Observations: Evidence for Efficient Lyman-continuum Photon Production in the Epoch of Reionization",
abstract = "We measure, for the first time, the median equivalent width (EW) of H alpha+[N II] in star-forming galaxies at z similar to 8. Our estimate leverages the unique photometric depth of the Spitzer/IRAC 5.8 mu m band mosaics (probing approximate to 5500-7100 angstrom at z similar to 8) of the GOODS Reionization Era Wide Area Treasury from Spitzer (GREATS) program. We median-stacked the stamps of 102 Lyman-break galaxies in the 3.6, 4.5, 5.8, and 8.0 mu m bands, after carefully removing potential contamination from neighboring sources. We infer an extreme rest-frame EW0(H alpha+[N II]) = 2328(-1127)(+1326) angstrom from the measured red [3.6] - [5.8] = 0.82 +/- 0.27 mag, consistent with young (less than or similar to 10(7) yr) average stellar population ages at z similar to 8. This implies an ionizing photon production efficiency of log(xi(ion,0)/erg Hz(-1)) = 25.97(-0.28)(+0.18). Such a high value for photoproduction, similar to the highest values found at z less than or similar to 4, indicates that only modest escape fractions f(esc) less than or similar to 0.3 (at 2 sigma) are sufficient for galaxies brighter than M-UV < -18 mag to reionize the neutral hydrogen at z similar to 8. This requirement is relaxed even more to f(esc)",
keywords = "STAR-FORMING GALAXIES, UV LUMINOSITY FUNCTIONS, ULTRA DEEP FIELD, YOUNG STELLAR POPULATIONS, LY-ALPHA, ESCAPE FRACTION, ACCELERATED REIONIZATION, SIGNIFICANT EVOLUTION, PHYSICAL-PROPERTIES, DUST ATTENUATION",
author = "Mauro Stefanon and Bouwens, {Rychard J.} and Illingworth, {Garth D.} and Ivo Labbe and Oesch, {Pascal A.} and Valentino Gonzalez",
year = "2022",
month = aug,
day = "1",
doi = "10.3847/1538-4357/ac7e44",
language = "English",
volume = "935",
journal = "Astrophysical Journal",
issn = "0004-637X",
publisher = "Institute of Physics Publishing, Inc",
number = "2",

}

RIS

TY - JOUR

T1 - High Equivalent Width of H alpha plus [N II] Emission in z similar to 8 Lyman-break Galaxies from IRAC 5.8 mu m Observations

T2 - Evidence for Efficient Lyman-continuum Photon Production in the Epoch of Reionization

AU - Stefanon, Mauro

AU - Bouwens, Rychard J.

AU - Illingworth, Garth D.

AU - Labbe, Ivo

AU - Oesch, Pascal A.

AU - Gonzalez, Valentino

PY - 2022/8/1

Y1 - 2022/8/1

N2 - We measure, for the first time, the median equivalent width (EW) of H alpha+[N II] in star-forming galaxies at z similar to 8. Our estimate leverages the unique photometric depth of the Spitzer/IRAC 5.8 mu m band mosaics (probing approximate to 5500-7100 angstrom at z similar to 8) of the GOODS Reionization Era Wide Area Treasury from Spitzer (GREATS) program. We median-stacked the stamps of 102 Lyman-break galaxies in the 3.6, 4.5, 5.8, and 8.0 mu m bands, after carefully removing potential contamination from neighboring sources. We infer an extreme rest-frame EW0(H alpha+[N II]) = 2328(-1127)(+1326) angstrom from the measured red [3.6] - [5.8] = 0.82 +/- 0.27 mag, consistent with young (less than or similar to 10(7) yr) average stellar population ages at z similar to 8. This implies an ionizing photon production efficiency of log(xi(ion,0)/erg Hz(-1)) = 25.97(-0.28)(+0.18). Such a high value for photoproduction, similar to the highest values found at z less than or similar to 4, indicates that only modest escape fractions f(esc) less than or similar to 0.3 (at 2 sigma) are sufficient for galaxies brighter than M-UV < -18 mag to reionize the neutral hydrogen at z similar to 8. This requirement is relaxed even more to f(esc)

AB - We measure, for the first time, the median equivalent width (EW) of H alpha+[N II] in star-forming galaxies at z similar to 8. Our estimate leverages the unique photometric depth of the Spitzer/IRAC 5.8 mu m band mosaics (probing approximate to 5500-7100 angstrom at z similar to 8) of the GOODS Reionization Era Wide Area Treasury from Spitzer (GREATS) program. We median-stacked the stamps of 102 Lyman-break galaxies in the 3.6, 4.5, 5.8, and 8.0 mu m bands, after carefully removing potential contamination from neighboring sources. We infer an extreme rest-frame EW0(H alpha+[N II]) = 2328(-1127)(+1326) angstrom from the measured red [3.6] - [5.8] = 0.82 +/- 0.27 mag, consistent with young (less than or similar to 10(7) yr) average stellar population ages at z similar to 8. This implies an ionizing photon production efficiency of log(xi(ion,0)/erg Hz(-1)) = 25.97(-0.28)(+0.18). Such a high value for photoproduction, similar to the highest values found at z less than or similar to 4, indicates that only modest escape fractions f(esc) less than or similar to 0.3 (at 2 sigma) are sufficient for galaxies brighter than M-UV < -18 mag to reionize the neutral hydrogen at z similar to 8. This requirement is relaxed even more to f(esc)

KW - STAR-FORMING GALAXIES

KW - UV LUMINOSITY FUNCTIONS

KW - ULTRA DEEP FIELD

KW - YOUNG STELLAR POPULATIONS

KW - LY-ALPHA

KW - ESCAPE FRACTION

KW - ACCELERATED REIONIZATION

KW - SIGNIFICANT EVOLUTION

KW - PHYSICAL-PROPERTIES

KW - DUST ATTENUATION

U2 - 10.3847/1538-4357/ac7e44

DO - 10.3847/1538-4357/ac7e44

M3 - Journal article

VL - 935

JO - Astrophysical Journal

JF - Astrophysical Journal

SN - 0004-637X

IS - 2

M1 - 94

ER -

ID: 317936243