%0 Generic %1 hayes2013lyman %A Hayes, Matthew %A Östlin, Göran %A Duval, Florent %A Sandberg, Andreas %A Guaita, Lucia %A Melinder, Jens %A Adamo, Angela %A Schaerer, Daniel %A Verhamme, Anne %A Orlitová, Ivana %A Mas-Hesse, J. Miguel %A Cannon, John M. %A Atek, Hakim %A Kunth, Daniel %A Laursen, Peter %A Otí-Floranes, Héctor %A Pardy, Stephen %A Rivera-Thorsen, Thøger %A Herenz, E. Christian %D 2013 %K low-z lya morphology %T The Lyman alpha Reference Sample: II. HST imaging results, integrated properties and trends %U http://arxiv.org/abs/1308.6578 %X We report upon new results regarding the Lya output of galaxies, derived from the Lyman alpha Reference Sample (LARS), focusing on Hubble Space Telescope imaging. For 14 galaxies we present intensity images in Lya, Halpha, and UV, and maps of Halpha/Hbeta, Lya equivalent width (EW), and Lya/Halpha. We present Lya and UV light profiles and show they are well-fitted by Sérsic profiles, but Lya profiles show indices systematically lower than those of the UV (n approx 1-2 instead of >~4). This reveals a general lack of the central concentration in Lya that is ubiquitous in the UV. Photometric growth curves increase more slowly for Lya than the FUV, showing that small apertures may underestimate the EW. For most galaxies, however, flux and EW curves flatten by radii ~10 kpc, suggesting that if placed at high-z, only a few of our galaxies would suffer from large flux losses. We compute global properties of the sample in large apertures, and show total luminosities to be independent of all other quantities. Normalized Lya throughput, however, shows significant correlations: escape is found to be higher in galaxies of lower star formation rate, dust content, mass, and several quantities that suggest harder ionizing continuum and lower metallicity. Eight galaxies could be selected as high-z Lya emitters, based upon their luminosity and EW. We discuss the results in the context of high-z Lya and UV samples. A few galaxies have EWs above 50 AA, and one shows f_escLya of 80%; such objects have not previously been reported at low-z.

@misc{hayes2013lyman, abstract = {We report upon new results regarding the Lya output of galaxies, derived from the Lyman alpha Reference Sample (LARS), focusing on Hubble Space Telescope imaging. For 14 galaxies we present intensity images in Lya, Halpha, and UV, and maps of Halpha/Hbeta, Lya equivalent width (EW), and Lya/Halpha. We present Lya and UV light profiles and show they are well-fitted by S\'ersic profiles, but Lya profiles show indices systematically lower than those of the UV (n approx 1-2 instead of >~4). This reveals a general lack of the central concentration in Lya that is ubiquitous in the UV. Photometric growth curves increase more slowly for Lya than the FUV, showing that small apertures may underestimate the EW. For most galaxies, however, flux and EW curves flatten by radii ~10 kpc, suggesting that if placed at high-z, only a few of our galaxies would suffer from large flux losses. We compute global properties of the sample in large apertures, and show total luminosities to be independent of all other quantities. Normalized Lya throughput, however, shows significant correlations: escape is found to be higher in galaxies of lower star formation rate, dust content, mass, and several quantities that suggest harder ionizing continuum and lower metallicity. Eight galaxies could be selected as high-z Lya emitters, based upon their luminosity and EW. We discuss the results in the context of high-z Lya and UV samples. A few galaxies have EWs above 50 AA, and one shows f_escLya of 80%; such objects have not previously been reported at low-z.}, added-at = {2013-09-02T04:01:24.000+0200}, author = {Hayes, Matthew and Östlin, Göran and Duval, Florent and Sandberg, Andreas and Guaita, Lucia and Melinder, Jens and Adamo, Angela and Schaerer, Daniel and Verhamme, Anne and Orlitová, Ivana and Mas-Hesse, J. Miguel and Cannon, John M. and Atek, Hakim and Kunth, Daniel and Laursen, Peter and Otí-Floranes, Héctor and Pardy, Stephen and Rivera-Thorsen, Thøger and Herenz, E. Christian}, biburl = {https://www.bibsonomy.org/bibtex/20a39dd3d07071e7e088d956dfd778076/miki}, description = {[1308.6578] The Lyman alpha Reference Sample: II. HST imaging results, integrated properties and trends}, interhash = {da3d23f50658ce4c7483da17f0ca46c9}, intrahash = {0a39dd3d07071e7e088d956dfd778076}, keywords = {low-z lya morphology}, note = {cite arxiv:1308.6578Comment: Submitted to ApJ and corrected for first iteration of referee report}, timestamp = {2013-09-02T04:01:24.000+0200}, title = {The Lyman alpha Reference Sample: II. HST imaging results, integrated properties and trends}, url = {http://arxiv.org/abs/1308.6578}, year = 2013 }