Hubble Space Telescope Grism Spectroscopy of Extreme Starbursts Across Cosmic Time: The Role of Dwarf Galaxies in the Star Formation History of the Universe

Abstract

Near infrared slitless spectroscopy with the Wide Field Camera 3, onboard the Hubble Space Telescope, offers a unique opportunity to study low-mass galaxy populations at high-redshift ($z\sim$1-2). While most high$-z$ surveys are biased towards massive galaxies, we are able to select sources via their emission lines that have very-faint continua. We investigate the star formation rate (SFR)-stellar mass ($M_{\star }$) relation for about 1000 emission-line galaxies identified over a wide redshift range of $0.3\lesssim z\lesssim 2.3$. We use the H${}_{\alpha }$ emission as an accurate SFR indicator and correct the broadband photometry for the strong nebular contribution to derive accurate stellar masses down to $M_{\star }\sim 10^7{M}_{\odot }$. We focus here on a subsample of galaxies that show extremely strong emission lines (EELGs) with rest-frame equivalent widths ranging from 200 to 1500 Å. This population consists of outliers to the normal SFR-$M_{\star }$ sequence with much higher specific SFRs ($>10$ Gyr${}^{-1}$). While on-sequence galaxies follow a continuous star formation process, EELGs are thought to be caught during an extreme burst of star formation that can double their stellar mass in less than $100$ Myr. The contribution of starbursts to the total star formation density appears to be larger than what has been reported for more massive galaxies in previous studies. In the complete mass range $8.2<$ log($M_{\star }/M_{\odot }$) $<10$ and a SFR lower completeness limit of about 2 $M_{\odot }$ yr${}^{-1}$ (10 $M_{\odot }$ yr${}^{-1}$) at $z\sim 1$ ($z\sim 2$), we find that starbursts having EW${}_{rest}$(H${}_{\alpha }$)$>$ 300, 200, and 100 A contribute up to $\sim 13$, 18, and 34 %, respectively, to the total SFR of emission-line selected sample at $z\sim 1-2$. The comparison with samples of massive galaxies shows an increase in the contribution of starbursts towards lower masses.

11 pages, 6 figures. The Astrophysical Journal, in press

References in corpus (12)

• The UKIRT Infrared Deep Sky Survey (UKIDSS)
• Mass and environment as drivers of galaxy evolution in SDSS and zCOSMOS and the origin of the Schechter function
• Star Formation in AEGIS Field Galaxies since z=1.1 : The Dominance of Gradually Declining Star Formation, and the Main Sequence of Star-Forming Galaxies
• Cold streams in early massive hot haloes as the main mode of galaxy formation
• The hierarchical formation of the brightest cluster galaxies
• The Mass-Metallicity Relation at z~2
• An ultra-deep near-infrared spectrum of a compact quiescent galaxy at z=2.2
• The Chandra COSMOS Survey, I: Overview and Point Source Catalog
• On the frequency, intensity and duration of starburst episodes triggered by galaxy interactions and mergers
• The Subaru/XMM-Newton Deep Survey (SXDS): III. X-Ray Data
• The Star Formation Demographics of Galaxies in the Local Volume
• Biases and Uncertainties in Physical Parameter Estimates of Lyman Break Galaxies from Broad-band Photometry

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• Early results from GLASS-JWST. VI: Extreme rest-optical equivalent widths detected in NIRISS Wide Field Slitless Spectroscopy
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• Lyman-Break Galaxies at $z\sim 3$ in the Subaru Deep Field: Luminosity Function, Clustering and [OIII] Emission
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• Correlations between H$\alpha$ Equivalent Width and Galaxy Properties at $z=0.47$: Physical or Selection-driven?
• Spectroscopically Identified Emission Line Galaxy Pairs in the WISP survey
• The Smallest Scale of Hierarchy Survey (SSH). I. Survey Description
• Narrow band selected high redshift galaxy candidates contaminated by lower redshift O[III] ultrastrong emitter line galaxies
• Taking a Break at Cosmic Noon: Continuum-selected Low-mass Galaxies Require Long Burst Cycles
• Recent stellar mass assembly of low-mass star-forming galaxies at redshifts 0.3 < z < 0.9
• Cosmic reflections I: the structural diversity of simulated and observed low-mass galaxy analogues
• A MUSE view of the multiple interacting system HCG 31
• Gamma-Ray Absorption By The Cosmic Lyman Continuum From Star-forming Galaxies
• The Evolution of the Luminosity Function for Luminous Compact Blue Galaxies to z=1
• Origin of Weak MgII and Higher Ionization Absorption Lines in an Outflow from an Intermediate-Redshift Dwarf Satellite Galaxy
• J-PAS: First Identification, Physical Properties and Ionization Efficiency of Extreme Emission Line Galaxies
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