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Lyman Continuum Escape Fraction from Low-mass Starbursts at z = 1.3

Alavi, Anahita and Colbert, James and Teplitz, Harry I. and Siana, Brian and Scarlata, Claudia and Rutkowski, Michael and Mehta, Vihang and Henry, Alaina and Dai, Y. Sophia and Haardt, Francesco and Bagley, Micaela (2020) Lyman Continuum Escape Fraction from Low-mass Starbursts at z = 1.3. Astrophysical Journal, 904 (1). Art. No. 59. ISSN 1538-4357. https://resolver.caltech.edu/CaltechAUTHORS:20200901-093252060

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Abstract

We present a new constraint on the Lyman continuum (LyC) escape fraction at . We obtain deep, high sensitivity far-UV imaging with the Advanced Camera for Surveys Solar Blind Channel on the Hubble Space Telescope, targeting 11 star-forming galaxies at 1.2 < z < 1.4. The galaxies are selected from the 3D-HST survey to have high Hα equivalent width (EW) with an EW > 190 Å, low stellar mass (M⋆ < 10¹⁰ M_⊙), and U-band magnitude of U < 24.2. These criteria identify young, low metallicity star-bursting populations similar to the early star-forming galaxies believed to have reionized the universe. We do not detect any LyC signal (with a signal-to-noise ratio > 3) in the individual galaxies or in the stack in the far-UV images. We place 3σ limits on the relative escape fraction of individual galaxies to be f_(esc,rel) < [0.10-0.22] and a stacked 3σ limit of f_(esc,rel) < 0.07. Measuring various galaxy properties, including stellar mass, dust attenuation, and star formation rate, we show that our measured values fall within the broad range of values covered by the confirmed LyC emitters from the literature. In particular, we compare the distribution of Hα and [O III] EWs of confirmed LyC emitters and non-detections, including the galaxies in this study. Finally, we discuss if a dichotomy seen in the distribution of Hα EWs can perhaps distinguish the LyC emitters from the non-detections.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.3847/1538-4357/abbd43DOIArticle
https://arxiv.org/abs/2007.05519arXivDiscussion Paper
ORCID:
AuthorORCID
Alavi, Anahita0000-0002-8630-6435
Colbert, James0000-0001-6482-3020
Teplitz, Harry I.0000-0002-7064-5424
Siana, Brian0000-0002-4935-9511
Scarlata, Claudia0000-0002-9136-8876
Rutkowski, Michael0000-0001-7016-5220
Mehta, Vihang0000-0001-7166-6035
Henry, Alaina0000-0002-6586-4446
Dai, Y. Sophia0000-0002-7928-416X
Haardt, Francesco0000-0003-3291-3704
Bagley, Micaela0000-0002-9921-9218
Additional Information:© 2020 The American Astronomical Society. Received 2020 July 6; revised 2020 September 25; accepted 2020 September 28; published 2020 November 20. Based on observations made with the NASA/ESA Hubble Space Telescope, obtained from the data archive at the Space Telescope Science Institute. STScI is operated by the Association of Universities for Research in Astronomy, Inc. under NASA contract NAS 5-26555. The primary data for this work were obtained with the HST operated by AURA, Inc., for NASA under contract NAS 5-26555. Support for this work was provided by NASA through grant HST-GO-14123 from the Space Telescope Science Institute, which is operated by AURA, Inc., under NASA contract NAS 5-26555. Some of the data presented in this paper were obtained from the Mikulski Archive for Space Telescopes (MAST). STScI is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555. Support for MAST for non-HST data is provided by the NASA Office of Space Science via grant NNX13AC07G and by other grants and contracts. Facilities: HST (ACS) - , MAST (HLSP) - .
Group:Infrared Processing and Analysis Center (IPAC)
Funders:
Funding AgencyGrant Number
NASANAS 5-26555
NASAHST-GO-14123
NASANNX13AC07G
Subject Keywords:Galaxy evolution ; Reionization ; Starburst galaxies ; Ultraviolet astronomy ; Intergalactic medium ; Emission line galaxies ; High-redshift galaxies
Issue or Number:1
Classification Code:Unified Astronomy Thesaurus concepts: Galaxy evolution (594); Reionization (1383); Starburst galaxies (1570); Ultraviolet astronomy (1736); Intergalactic medium (813); Emission line galaxies (459); High-redshift galaxies (734)
Record Number:CaltechAUTHORS:20200901-093252060
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20200901-093252060
Official Citation:Anahita Alavi et al 2020 ApJ 904 59
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:105196
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:08 Sep 2020 18:32
Last Modified:20 Nov 2020 18:42

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