%0 Generic %1 karman2016integralfield %A Karman, W. %A Caputi, K. I. %A Caminha, G. B. %A Gronke, M. %A Grillo, C. %A Balestra, I. %A Rosati, P. %A Vanzella, E. %A Coe, D. %A Dijkstra, M. %A Koekemoer, A. M. %A Mercurio, A. %A Nonino, M. %D 2016 %K Lya emitters faint %T MUSE integral-field spectroscopy towards the Frontier Fields cluster Abell S1063: II. Properties of low luminosity Lyman alpha emitters at z>3 %U http://arxiv.org/abs/1606.01471 %X In spite of their conjectured importance for the Epoch of Reionization, the properties of low-mass galaxies are currently still under large debate. In this article, we study the stellar and gaseous properties of faint, low-mass galaxies at z>3. We observed the Frontier Fields cluster Abell S1063 with MUSE over a 2 arcmin^2 field, and combined integral-field spectroscopy with gravitational lensing to perform a blind search for intrinsically faint Lya emitters (LAEs). We found in total 14 lensed LAEs and increased the number of spectroscopically-confirmed multiple-image families from 6 to 17, and updated our gravitational-lensing model accordingly. The lensing-corrected Lya luminosities are with L(Lya) <= 10^41.5 erg/s among the lowest for spectroscopically confirmed LAEs at any redshift. We used expanding gaseous shell models to fit the Lya line profile, and find low column densities and expansion velocities. This is to our knowledge the first time that gaseous properties of such faint galaxies at z>=3 are reported. We performed SED modelling to broadband photometry from the U-band through the infrared to determine the stellar properties of these LAEs. The stellar masses are very low (10^6-8 Msun), and are accompanied by very young ages of 1-100 Myr. The very high specific star formation rates (~100/Gyr) are characteristic of starburst galaxies, and we find that most galaxies will double their stellar mass in <20 Myr. The UV-continuum slopes beta are low in our sample, with beta<-2 for all galaxies with Mstar < 10^8 Msun. We conclude that low-mass galaxies at 3<z<6 are forming stars at higher rates than seen locally or in more massive galaxies. The young stellar populations with high star-formation rates and low HI column densities lead to continuum slopes and escape fractions expected for a scenario where low mass galaxies reionise the Universe.

@misc{karman2016integralfield, abstract = {In spite of their conjectured importance for the Epoch of Reionization, the properties of low-mass galaxies are currently still under large debate. In this article, we study the stellar and gaseous properties of faint, low-mass galaxies at z>3. We observed the Frontier Fields cluster Abell S1063 with MUSE over a 2 arcmin^2 field, and combined integral-field spectroscopy with gravitational lensing to perform a blind search for intrinsically faint Lya emitters (LAEs). We found in total 14 lensed LAEs and increased the number of spectroscopically-confirmed multiple-image families from 6 to 17, and updated our gravitational-lensing model accordingly. The lensing-corrected Lya luminosities are with L(Lya) <= 10^41.5 erg/s among the lowest for spectroscopically confirmed LAEs at any redshift. We used expanding gaseous shell models to fit the Lya line profile, and find low column densities and expansion velocities. This is to our knowledge the first time that gaseous properties of such faint galaxies at z>=3 are reported. We performed SED modelling to broadband photometry from the {\em U}-band through the infrared to determine the stellar properties of these LAEs. The stellar masses are very low (10^{6-8} Msun), and are accompanied by very young ages of 1-100 Myr. The very high specific star formation rates (~100/Gyr) are characteristic of starburst galaxies, and we find that most galaxies will double their stellar mass in <20 Myr. The UV-continuum slopes beta are low in our sample, with beta<-2 for all galaxies with Mstar < 10^8 Msun. We conclude that low-mass galaxies at 3<z<6 are forming stars at higher rates than seen locally or in more massive galaxies. The young stellar populations with high star-formation rates and low HI column densities lead to continuum slopes and escape fractions expected for a scenario where low mass galaxies reionise the Universe.}, added-at = {2016-06-07T10:00:36.000+0200}, author = {Karman, W. and Caputi, K. I. and Caminha, G. B. and Gronke, M. and Grillo, C. and Balestra, I. and Rosati, P. and Vanzella, E. and Coe, D. and Dijkstra, M. and Koekemoer, A. M. and Mercurio, A. and Nonino, M.}, biburl = {https://www.bibsonomy.org/bibtex/2d65bfb793eef5a4fa6accb6e3bfebcc8/miki}, description = {[1606.01471] MUSE integral-field spectroscopy towards the Frontier Fields cluster Abell S1063: II. Properties of low luminosity Lyman alpha emitters at z&gt;3}, interhash = {2cf62c68cfdd866f45fae83d89181d87}, intrahash = {d65bfb793eef5a4fa6accb6e3bfebcc8}, keywords = {Lya emitters faint}, note = {cite arxiv:1606.01471Comment: 43 pages, incl. 26 pages appendix, 17 figures, 4 tables, submitted to A&A}, timestamp = {2016-06-07T10:00:36.000+0200}, title = {MUSE integral-field spectroscopy towards the Frontier Fields cluster Abell S1063: II. Properties of low luminosity Lyman alpha emitters at z>3}, url = {http://arxiv.org/abs/1606.01471}, year = 2016 }