The origin of the observed Ly α EW distribution of dwarf galaxies at z ∼2

Christopher Snapp-Kolas; Brian Siana; Timothy Gburek; Anahita Alavi; Najmeh Emami; Johan Richard; Daniel P. Stark; Claudia Scarlata; Brian C. Lemaux; Giovanni Zamorani; Sandro Bardelli; Nimish Hathi; Paolo Cassata

doi:10.1093/mnras/stad2412

The origin of the observed Ly α EW distribution of dwarf galaxies at z ∼2

Christopher Snapp-Kolas, Brian Siana, Timothy Gburek, Anahita Alavi, Najmeh Emami, Johan Richard, Daniel P. Stark, Claudia Scarlata, Brian C. Lemaux, Giovanni Zamorani, Sandro Bardelli, Nimish Hathi, Paolo Cassata

Physics and Astronomy (Twin Cities)

Research output: Contribution to journal › Article › peer-review

Abstract

We present a rest-UV-selected sample of 32 lensed galaxies at z ∼2 observed with joint Keck/LRIS rest-UV and Keck/MOSFIRE rest-optical spectra behind the clusters Abell 1689, MACS J0717, and MACS J1149. The sample pushes towards the faintest UV luminosities observed () at this redshift. The fraction of dwarf galaxies identified as Ly α emitters (Å) is. We use the Balmer lines and UV continuum to estimate both the intrinsic EW and the Ly α escape fraction to determine their relative importance in dictating the observed EW distribution. Fainter galaxies (M_UV > -19) show larger intrinsic EWs and escape fractions than brighter galaxies. Only galaxies with intrinsic EWs greater than 40 Å have escape fractions larger than 5 per cent. We find little to no anticorrelation between the escape fraction and dust in dwarf galaxies. The volumetric escape fraction of our sample is in agreement with measurements found elsewhere in the literature. 60 per cent of the total integrated Ly α luminosity density comes from galaxies with EW_obs > 20 Å.

Original language	English (US)
Pages (from-to)	5500-5511
Number of pages	12
Journal	Monthly Notices of the Royal Astronomical Society
Volume	525
Issue number	4
DOIs	https://doi.org/10.1093/mnras/stad2412
State	Published - Nov 1 2023

Bibliographical note

Publisher Copyright:
© 2023 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society.

Keywords

galaxies: evolution
galaxies: high-redshift

Publisher link

10.1093/mnras/stad2412

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title = "The origin of the observed Ly α EW distribution of dwarf galaxies at z ∼2",

abstract = "We present a rest-UV-selected sample of 32 lensed galaxies at z ∼2 observed with joint Keck/LRIS rest-UV and Keck/MOSFIRE rest-optical spectra behind the clusters Abell 1689, MACS J0717, and MACS J1149. The sample pushes towards the faintest UV luminosities observed () at this redshift. The fraction of dwarf galaxies identified as Ly α emitters ({\AA}) is. We use the Balmer lines and UV continuum to estimate both the intrinsic EW and the Ly α escape fraction to determine their relative importance in dictating the observed EW distribution. Fainter galaxies (MUV > -19) show larger intrinsic EWs and escape fractions than brighter galaxies. Only galaxies with intrinsic EWs greater than 40 {\AA} have escape fractions larger than 5 per cent. We find little to no anticorrelation between the escape fraction and dust in dwarf galaxies. The volumetric escape fraction of our sample is in agreement with measurements found elsewhere in the literature. 60 per cent of the total integrated Ly α luminosity density comes from galaxies with EWobs > 20 {\AA}.",

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AU - Snapp-Kolas, Christopher

AU - Siana, Brian

AU - Gburek, Timothy

AU - Alavi, Anahita

AU - Emami, Najmeh

AU - Richard, Johan

AU - Stark, Daniel P.

AU - Scarlata, Claudia

AU - Lemaux, Brian C.

AU - Zamorani, Giovanni

AU - Bardelli, Sandro

AU - Hathi, Nimish

AU - Cassata, Paolo

PY - 2023/11/1

Y1 - 2023/11/1

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AB - We present a rest-UV-selected sample of 32 lensed galaxies at z ∼2 observed with joint Keck/LRIS rest-UV and Keck/MOSFIRE rest-optical spectra behind the clusters Abell 1689, MACS J0717, and MACS J1149. The sample pushes towards the faintest UV luminosities observed () at this redshift. The fraction of dwarf galaxies identified as Ly α emitters (Å) is. We use the Balmer lines and UV continuum to estimate both the intrinsic EW and the Ly α escape fraction to determine their relative importance in dictating the observed EW distribution. Fainter galaxies (MUV > -19) show larger intrinsic EWs and escape fractions than brighter galaxies. Only galaxies with intrinsic EWs greater than 40 Å have escape fractions larger than 5 per cent. We find little to no anticorrelation between the escape fraction and dust in dwarf galaxies. The volumetric escape fraction of our sample is in agreement with measurements found elsewhere in the literature. 60 per cent of the total integrated Ly α luminosity density comes from galaxies with EWobs > 20 Å.

KW - galaxies: evolution

KW - galaxies: high-redshift

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The origin of the observed Ly α EW distribution of dwarf galaxies at z ∼2

Abstract

Bibliographical note

Keywords

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