AstroSat detection of Lyman continuum emission from a z=1.42 galaxy

Abstract

One of the outstanding problems of current observational cosmology is to understand the nature of sources that produced the bulk of the ionizing radiation after the Cosmic Dark Age. Direct detection of these reionization sources is practically infeasible at high redshift due to the steep decline of intergalactic medium transmission. However, a number of low-redshift analogs emitting Lyman continuum at~900 Angstrom ~restframe are now detected at $z<0.4$ and there are detections in the range $2.5<z<3.5$ also. Here, we report the detection of Lyman continuum emission with a high escape fraction (>20%) from a low-mass clumpy galaxy at z=1.42, in the middle of the redshift range where no detection has been made before and near the peak of the Cosmic Star-formation history. The observation was made in the Hubble Extreme Deep field by the wide-field Ultra-Violet-Imaging Telescope onboard AstroSat. This is the first detection of Extreme Ultraviolet radiation from a distant galaxy at a rest-frame wavelength of 600 Angstrom, and it opens up a new window to constrain the shape of the ionization spectrum. Further observations with AstroSat should significantly increase the sample of Lyman continuum leaking galaxies at Cosmic Noon.

arXiv commentPublished on 24th August, 2020, by Nature Astronomy Letters. The published version is available at https://www.nature.com/articles/s41550-020-1173-5

References in corpus (52)

• Maps of Dust IR Emission for Use in Estimation of Reddening and CMBR Foregrounds
• Stellar population synthesis at the resolution of 2003
• Star Formation in Galaxies Along the Hubble Sequence
• The Dust Content and Opacity of Actively Star-Forming Galaxies
• Starburst99: Synthesis Models for Galaxies with Active Star Formation
• Cosmic Star Formation History
• EAZY: A Fast, Public Photometric Redshift Code
• [O III]/[N II] as an Abundance Indicator at High Redshift
• CIGALE: a python Code Investigating GALaxy Emission
• Dust Absorption And The Ultraviolet Luminosity Density At z \approx 3 As Calibrated By Local Starburst Galaxies
• A new calibration of stellar parameters of Galactic O stars
• The 3D-HST Survey: Hubble Space Telescope WFC3/G141 grism spectra, redshifts, and emission line measurements for $\sim 100,000$ galaxies
• A Survey of Star-Forming Galaxies in the z=1.4-2.5 `Redshift Desert': Overview
• Galaxy Zoo Green Peas: Discovery of A Class of Compact Extremely Star-Forming Galaxies
• Dust Attenuation Curves in the Local Universe: Demographics and New Laws for Star-forming Galaxies and High-redshift Analogs
• The Chandra Deep Field-South Survey: 7 Ms Source Catalogs
• An updated analytic model for the attenuation by the intergalactic medium
• A deep ALMA image of the Hubble Ultra Deep Field
• The MUSE Hubble Ultra Deep Field Survey: I. Survey description, data reduction and source detection
• Detection of high Lyman continuum leakage from four low-redshift compact star-forming galaxies
• Low-redshift Lyman continuum leaking galaxies with high [OIII]/[OII] ratios
• The Keck Lyman Continuum Spectroscopic Survey (KLCS): The Emergent Ionizing Spectrum of Galaxies at $z\sim 3$
• Rest-frame ultraviolet-to-optical spectral characteristics of extremely metal-poor and metal-free galaxies
• The HST eXtreme Deep Field XDF: Combining all ACS and WFC3/IR Data on the HUDF Region into the Deepest Field Ever
• Lyman continuum leaking from the compact star-forming dwarf galaxy J0925+1403
• J1154+2443: a low-redshift compact star-forming galaxy with a 46 per cent leakage of Lyman continuum photons
• The HDUV Survey: A Revised Assessment of the Relationship between UV Slope and Dust Attenuation for High-Redshift Galaxies
• Star formation at z=1.47 from HiZELS: An Hα+[OII] double-blind study
• In-orbit Calibrations of the Ultra-Violet Imaging Telescope
• Clumpy Galaxies in GOODS and GEMS: Massive Analogs of Local Dwarf Irregulars
• A Local Clue to the Reionization of the Universe
• Hubble imaging of the ionizing radiation from a star-forming galaxy at z=3.2 with fesc>50%
• An extreme [OIII] emitter at $z=3.2$: a low metallicity Lyman continuum source
• AGN Emission Line Diagnostics and the Mass-Metallicity Relation up to Redshift z~2: the Impact of Selection Effects and Evolution
• The Lyman Continuum Escape Survey: Ionizing Radiation from [O III]-Strong Sources at a Redshift of 3.1
• Direct Lyman continuum and Lyman-alpha escape observed at redshift 4
• The MUSE Hubble Ultra Deep Field Survey: II. Spectroscopic redshifts and comparisons to color selections of high-redshift galaxies
• Escape of Lyman continuum radiation from local galaxies - Detection of leakage from the young starburst Tol 1247-232
• New Constraints on the Lyman Continuum Escape Fraction at z~1.3
• Q1549-C25: A Clean Source of Lyman-Continuum Emission at $z=3.15$
• HiZELS: a high redshift survey of H-alpha emitters. II: the nature of star-forming galaxies at z=0.84
• Direct Detection of Lyman Continuum Escape from Local Starburst Galaxies with the Cosmic Origins Spectrograph
• Gravitational lensing reveals ionizing ultraviolet photons escaping from a distant galaxy
• The Connection Between Reddening, Gas Covering Fraction, and the Escape of Ionizing Radiation at High Redshift
• Spectroscopic Measurements of the Far-Ultraviolet Dust Attenuation Curve at z~3
• A Monte Carlo simulation of the intergalactic absorption and the detectability of the Lyman continuum from distant galaxies
• In-orbit Performance of UVIT and First Results
• A Low Lyman Continuum Escape Fraction of $<10\%$ for Extreme [OIII] Emitters in an Overdensity at z$\sim 3.5$
• Observable Properties of Cosmological Reionization Sources
• The Far-Infrared, UV and Molecular Gas Relation in Galaxies up to z=2.5
• Far-Ultraviolet Imaging of the Hubble Deep Field North: Star Formation in Normal Galaxies at z<1
• A Faint Flux-Limited Lyman Alpha Emitter Sample at $z\sim 0.3$

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• Lyman continuum leakage from low-mass galaxies with Mstar < 1.E8 Msun
• The Low-Redshift Lyman Continuum Survey. Unveiling the ISM properties of low-$z$ Lyman continuum emitters
• The UV-brightest Lyman continuum emitting star-forming galaxy
• Lyman alpha and Lyman continuum emission of MgII-selected star-forming galaxies
• Predicting LyC emission of galaxies using their physical and Ly$\alpha$ emission properties
• Two Modes of LyC Escape From Bursty Star Formation: Implications for [C II] Deficits and the Sources of Reionization
• Lyman Continuum Escape Fraction from Low-mass Starbursts at z=1.3
• IGM Transmission Bias for $z$ $\ge$ 2.9 Lyman Continuum Detected Galaxies
• A bottom-up search for Lyman-continuum leakage in the Hubble Ultra Deep Field
• The AstroSat UV Deep Field North: the far and near ultraviolet photometric catalog
• Lyman continuum leaker candidates among highly ionised, low-redshift dwarf galaxies selected from HeII
• CDFS-6664: A candidate of Lyman-continuum Emission at z~3.8 detected by HDUV
• Extended far-ultraviolet emission in distant dwarf galaxies
• Candidate z ~ 2.5 Lyman Continuum Sources in the GOODS Fields
• The leakage of Lyman-continuum photons from a major merger at $z\sim 1$
• The Ultraviolet Deep Imaging Survey of Galaxies in the Bootes Void I: catalog, color-magnitude relations and star formation
• In orbit performance of UVIT over the 5 years
• Detections of [C II] 158 $\mu$m and [O III] 88 $\mu$m in a Local Lyman Continuum Emitter, Mrk 54, and its Implications to High-redshift ALMA Studies
• SDSS-IV MaNGA: an observational evidence of density bounded region in a Lyman-$\alpha$ emitter
• Multiwavelength study of radio galaxy Pictor A: detection of western hotspot in far-UV and possible origin of high energy emissions
• The CUBES Science Case
• Unveiling an old disk around a massive young leaking blueberry in SDSS-IV MaNGA
• AstroSat/UVIT far and near UV deep field around IC 4329A