%0 Generic %1 rutkowski2017lyman %A Rutkowski, Michael J. %A Scarlata, Claudia %A Henry, Alaina %A Hayes, Matthew %A Mehta, Vihang %A Hathi, Nimish %A Cohen, Seth %A Windhorst, Rogier %A Koekemoer, Anton M. %A Teplitz, Harry I. %A Haardt, Francesco %A Siana, Brian %D 2017 %K Lyman continuum escape %T The Lyman Continuum escape fraction of emission line-selected $z\sim2.5$ galaxies is less than 15% %U http://arxiv.org/abs/1705.06355 %X Recent work suggests that strong emission line, star-forming galaxies may be significant Lyman Continuum leakers. We combine archival HST broadband ultraviolet and optical imaging (F275W and F606W, respectively) with emission line catalogs derived from WFC3 IR G141 grism spectroscopy to search for escaping Lyman Continuum (LyC) emission from homogeneously selected $z\simeq$2.5 SFGs. We detect no escaping Lyman Continuum from SFGs selected on OII nebular emission (N=208) and, within a narrow redshift range, on OIII/OII. We measure 1$\sigma$ upper limits to the LyC escape fraction relative to the non-ionizing UV continuum from OII emitters, $f_esc<$5.6%, and strong OIII/OII$>$5 ELGs, $f_esc<$14.0%. Our observations are not deep enough to detect $f_escłesssim$10% typical of the low redshift Lyman continuum emitters. However, we find that this population represents a small fraction of the star-forming galaxy population at $z\simeq$2. Thus, unless the number of extreme emission line galaxies grows substantially to z$>$6, such galaxies may be insufficient for reionization. Deeper survey data in the rest-frame ionizing UV will be necessary to determine whether strong line ratios could be useful for pre-selecting LyC leakers at high redshift.

@misc{rutkowski2017lyman, abstract = {Recent work suggests that strong emission line, star-forming galaxies may be significant Lyman Continuum leakers. We combine archival HST broadband ultraviolet and optical imaging (F275W and F606W, respectively) with emission line catalogs derived from WFC3 IR G141 grism spectroscopy to search for escaping Lyman Continuum (LyC) emission from homogeneously selected $z\simeq$2.5 SFGs. We detect no escaping Lyman Continuum from SFGs selected on [OII] nebular emission (N=208) and, within a narrow redshift range, on [OIII]/[OII]. We measure 1$\sigma$ upper limits to the LyC escape fraction relative to the non-ionizing UV continuum from [OII] emitters, $f_{esc}<$5.6%, and strong [OIII]/[OII]$>$5 ELGs, $f_{esc}<$14.0%. Our observations are not deep enough to detect $f_{esc}\lesssim$10% typical of the low redshift Lyman continuum emitters. However, we find that this population represents a small fraction of the star-forming galaxy population at $z\simeq$2. Thus, unless the number of extreme emission line galaxies grows substantially to z$>$6, such galaxies may be insufficient for reionization. Deeper survey data in the rest-frame ionizing UV will be necessary to determine whether strong line ratios could be useful for pre-selecting LyC leakers at high redshift.}, added-at = {2017-05-19T10:06:19.000+0200}, author = {Rutkowski, Michael J. and Scarlata, Claudia and Henry, Alaina and Hayes, Matthew and Mehta, Vihang and Hathi, Nimish and Cohen, Seth and Windhorst, Rogier and Koekemoer, Anton M. and Teplitz, Harry I. and Haardt, Francesco and Siana, Brian}, biburl = {https://www.bibsonomy.org/bibtex/256d91f3369361c4e83639012cb22c739/miki}, description = {[1705.06355] The Lyman Continuum escape fraction of emission line-selected $z\sim2.5$ galaxies is less than 15%}, interhash = {e2e1ce5686d49f2b3c0115944a204e8c}, intrahash = {56d91f3369361c4e83639012cb22c739}, keywords = {Lyman continuum escape}, note = {cite arxiv:1705.06355Comment: accepted to ApJ Letters}, timestamp = {2017-05-19T10:06:19.000+0200}, title = {The Lyman Continuum escape fraction of emission line-selected $z\sim2.5$ galaxies is less than 15%}, url = {http://arxiv.org/abs/1705.06355}, year = 2017 }