%0 Generic %1 atek2014hubble %A Atek, Hakim %A Kneib, Jean-Paul %A Pacifici, Camilla %A Malkan, Matthew %A Charlot, Stephane %A Lee, Janice %A Bedregal, Alejandro %A Bunker, Andrew J. %A Colbert, James W. %A Dressler, Alan %A Hathi, Nimish %A Lehnert, Matthew %A Martin, Crystal L. %A McCarthy, Patrick %A Rafelski, Marc %A Ross, Nathaniel %A Siana, Brian %A Teplitz, Harry I. %D 2014 %K dwarf galaxy grism sfr %T Hubble Space Telescope Grism Spectroscopy of Extreme Starbursts Across Cosmic Time: The Role of Dwarf Galaxies in the Star Formation History of the Universe %U http://arxiv.org/abs/1406.4132 %X 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 $0.3 z łesssim 2.3$. 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 $M_\star 10^7 M_ødot$. 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 \AA. 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($M_\star/M_ødot$) $< 10$ and a SFR lower completeness limit of about 2 $M_ødot$ yr$^-1$ (10 $M_ødot$ yr$^-1$) at $z\sim1$ ($z 2$), we find that starbursts having EW$_rest$(H$_\alpha$)$>$ 300, 200, and 100 A contribute up to $\sim13$, 18, and 34 %, respectively, to the total SFR of emission-line selected sample at $z\sim1-2$. The comparison with samples of massive galaxies shows an increase in the contribution of starbursts towards lower masses.

@misc{atek2014hubble, 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 \AA. 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 $z\sim1$ ($z \sim 2$), we find that starbursts having EW$_{rest}$(H$_{\alpha}$)$>$ 300, 200, and 100 A contribute up to $\sim13$, 18, and 34 %, respectively, to the total SFR of emission-line selected sample at $z\sim1-2$. The comparison with samples of massive galaxies shows an increase in the contribution of starbursts towards lower masses.}, added-at = {2014-06-18T19:05:44.000+0200}, author = {Atek, Hakim and Kneib, Jean-Paul and Pacifici, Camilla and Malkan, Matthew and Charlot, Stephane and Lee, Janice and Bedregal, Alejandro and Bunker, Andrew J. and Colbert, James W. and Dressler, Alan and Hathi, Nimish and Lehnert, Matthew and Martin, Crystal L. and McCarthy, Patrick and Rafelski, Marc and Ross, Nathaniel and Siana, Brian and Teplitz, Harry I.}, biburl = {https://www.bibsonomy.org/bibtex/26ad1886ff4bebf370b49701035b0c1c3/miki}, description = {[1406.4132] Hubble Space Telescope Grism Spectroscopy of Extreme Starbursts Across Cosmic Time: The Role of Dwarf Galaxies in the Star Formation History of the Universe}, interhash = {9b15a8d29d32e2fe47377bac06120255}, intrahash = {6ad1886ff4bebf370b49701035b0c1c3}, keywords = {dwarf galaxy grism sfr}, note = {cite arxiv:1406.4132Comment: 11 pages, 6 figures. The Astrophysical Journal, in press}, timestamp = {2014-06-18T19:05:44.000+0200}, title = {Hubble Space Telescope Grism Spectroscopy of Extreme Starbursts Across Cosmic Time: The Role of Dwarf Galaxies in the Star Formation History of the Universe}, url = {http://arxiv.org/abs/1406.4132}, year = 2014 }