%0 Generic %1 rutkowski2015lyman %A Rutkowski, Michael J. %A Scarlata, Claudia %A Haardt, Francesco %A Siana, Brian %A Henry, Alaina %A Rafelski, Marc %A Hayes, Matthew %A Salvato, Mara %A Pahl, Anthony J. %A Mehta, Vihang %A Beck, Melanie %A Malkan, Matthew %A Teplitz, Harry I. %D 2015 %K escape fraction low mass z~1 %T The Lyman Continuum Escape Fraction of Low-Mass Star-Forming Galaxies at z~1 %U http://arxiv.org/abs/1511.01998 %X To date no direct detection of Lyman continuum emission has been measured for intermediate--redshift z~1 star-forming galaxies . We combine HST grism spectroscopy with GALEX UV and ground--based optical imaging to extend the search for escaping Lyman continuum to a large (~600) sample of z~1 low-mass, moderately star-forming galaxies selected initially on H$\alpha$ emission. The characteristic escape fraction of LyC from SFGs that populate this parameter space remains weakly constrained by previous surveys, but these faint SFGs are assumed to play a significant role in the reionization of neutral hydrogen in the intergalactic medium (IGM) at high redshift (z>6). We do not make an unambiguous detection of escaping LyC radiation from this $z\sim1$ sample, individual non--detections to constrain the absolute Lyman continuum escape fraction, $f_esc$<2.1% (3$\sigma$). We measure upper limits of $f_esc$<9.6% from a sample of SFGs selected on high H$\alpha$ equivalent width (EW>200\AA), which are thought to be close analogs of high redshift sources of reionization. For reference, we also present an emissivity--weighted escape fraction which is useful as a measurement of the general contribution of the SFGs to the z~1 ionizing UV background. In the discussion, we consider the implications of these intermediate redshift constraints for the re--ionization of hydrogen in the intergalactic medium at high (z>6) redshift. If the escape fraction of SFGs increases with redshift or an unobserved population of faint (M$_UV$<-13 AB) SFGs with $f_esc$>3% contributes significantly, reionization by SFGs is marginally consistent with independent observations from Planck.

@misc{rutkowski2015lyman, abstract = {To date no direct detection of Lyman continuum emission has been measured for intermediate--redshift z~1 star-forming galaxies . We combine HST grism spectroscopy with GALEX UV and ground--based optical imaging to extend the search for escaping Lyman continuum to a large (~600) sample of z~1 low-mass, moderately star-forming galaxies selected initially on H$\alpha$ emission. The characteristic escape fraction of LyC from SFGs that populate this parameter space remains weakly constrained by previous surveys, but these faint SFGs are assumed to play a significant role in the reionization of neutral hydrogen in the intergalactic medium (IGM) at high redshift (z>6). We do not make an unambiguous detection of escaping LyC radiation from this $z\sim1$ sample, individual non--detections to constrain the absolute Lyman continuum escape fraction, $f_{esc}$<2.1% (3$\sigma$). We measure upper limits of $f_{esc}$<9.6% from a sample of SFGs selected on high H$\alpha$ equivalent width (EW>200\AA), which are thought to be close analogs of high redshift sources of reionization. For reference, we also present an emissivity--weighted escape fraction which is useful as a measurement of the general contribution of the SFGs to the z~1 ionizing UV background. In the discussion, we consider the implications of these intermediate redshift constraints for the re--ionization of hydrogen in the intergalactic medium at high (z>6) redshift. If the escape fraction of SFGs increases with redshift or an unobserved population of faint (M$_{UV}$<-13 AB) SFGs with $f_{esc}$>3% contributes significantly, reionization by SFGs is marginally consistent with independent observations from Planck.}, added-at = {2015-11-09T10:24:13.000+0100}, author = {Rutkowski, Michael J. and Scarlata, Claudia and Haardt, Francesco and Siana, Brian and Henry, Alaina and Rafelski, Marc and Hayes, Matthew and Salvato, Mara and Pahl, Anthony J. and Mehta, Vihang and Beck, Melanie and Malkan, Matthew and Teplitz, Harry I.}, biburl = {https://www.bibsonomy.org/bibtex/2b4fceb355c6964920a4dabe779e7f233/miki}, description = {[1511.01998] The Lyman Continuum Escape Fraction of Low-Mass Star-Forming Galaxies at z~1}, interhash = {a78992632ac5f5c8d9b9f056b926dbb4}, intrahash = {b4fceb355c6964920a4dabe779e7f233}, keywords = {escape fraction low mass z~1}, note = {cite arxiv:1511.01998Comment: submitted for second review to ApJ}, timestamp = {2015-11-09T10:24:13.000+0100}, title = {The Lyman Continuum Escape Fraction of Low-Mass Star-Forming Galaxies at z~1}, url = {http://arxiv.org/abs/1511.01998}, year = 2015 }