The Spectrally Resolved Lyman-Alpha Emission Of Three Lyman-Alpha-Selected Field Galaxies At Z Similar To 2.4 From The HETDEX Pilot Survey

dc.contributor.utaustinauthorChonis, Taylor S.en_US
dc.contributor.utaustinauthorFinkelstein, Steven L.en_US
dc.contributor.utaustinauthorGebhardt, Karlen_US
dc.contributor.utaustinauthorOverzier, Roderik A.en_US
dc.creatorChonis, Taylor S.en_US
dc.creatorBlanc, Guillermo A.en_US
dc.creatorHill, Gary J.en_US
dc.creatorAdams, Joshua J.en_US
dc.creatorFinkelstein, Steven L.en_US
dc.creatorGebhardt, Karlen_US
dc.creatorKollmeier, Juna A.en_US
dc.creatorCiardullo, Robinen_US
dc.creatorDrory, Niven_US
dc.creatorGronwall, Carylen_US
dc.creatorHagen, Alexen_US
dc.creatorOverzier, Roderik A.en_US
dc.creatorSong, Mimien_US
dc.creatorZeimann, Gregory R.en_US
dc.description.abstractWe present new results on the spectrally resolved Ly alpha emission of three Ly alpha-emitting field galaxies at z similar to 2.4 with high Lya equivalent width (> 100 angstrom) and Lya luminosity (similar to 10(43) erg s(-1)). At 120 km s(-1) (FWHM) spectral resolution, the prominent double-peaked Lya profile straddles the systemic velocity, where the velocity zero point is determined from spectroscopy of the galaxies' rest-frame optical nebular emission lines. The average velocity offset from systemic of the stronger redshifted emission component for our sample is 176 km s(-1) while the average total separation between the redshifted and main blueshifted emission components is 380 km s(-1). These measurements are a factor of similar to 2 smaller than for UV-continuum-selected galaxies that show Lya in emission with lower Lya equivalent widths. We compare our Lya spectra to the predicted line profiles of a spherical "expanding shell" Ly alpha radiative transfer grid that models large-scale galaxy outflows. Specifically, blueward of the systemic velocity where two galaxies show a weak, highly blueshifted (by similar to 1000 km s(-1)) tertiary emission peak, the model line profiles are a relatively poor representation of the observed spectra. Since the neutral gas column density has a dominant influence over the shape of the Lya line profile, we caution against equating the observed Lya velocity offset with a physical outflow velocity, especially at lower spectral resolution where the unresolved Lya velocity offset is a convoluted function of several degenerate parameters. Referring to rest-frame ultraviolet and optical Hubble Space Telescope imaging, we find that galaxy-galaxy interactions may play an important role in inducing a starburst that results in copious Lya emission as well as perturbing the gas distribution and velocity field, both of which have strong influence over the Lya emission line profile.en_US
dc.description.sponsorshipNational Science Foundation AST-0926815en_US
dc.description.sponsorshipTexas Norman Hackerman Advanced Research Program 003658-0295-2007en_US
dc.identifier.citationChonis, Taylor S., Guillermo A. Blanc, Gary J. Hill, Joshua J. Adams, Steven L. Finkelstein, Karl Gebhardt, Juna A. Kollmeier et al. "The Spectrally Resolved Lyman-alpha Emission of Three Lyman-alpha Selected Field Galaxies at z~ 2.4 from the HETDEX Pilot Survey." arXiv preprint arXiv:1308.1957 (2013).en_US
dc.relation.ispartofserialAstrophysical Journalen_US
dc.rightsAdministrative deposit of works to Texas ScholarWorks: This works author(s) is or was a University faculty member, student or staff member; this article is already available through open access or the publisher allows a PDF version of the article to be freely posted online. The library makes the deposit as a matter of fair use (for scholarly, educational, and research purposes), and to preserve the work and further secure public access to the works of the University.en_US
dc.subjectgalaxies: evolutionen_US
dc.subjectgalaxies: high-redshiften_US
dc.subjectgalaxies: ismen_US
dc.subjectline: profilesen_US
dc.subjectradiative transferen_US
dc.subjectstar-forming galaxiesen_US
dc.subjectlyman break galaxiesen_US
dc.subjectextragalactic legacy surveyen_US
dc.subjectevolution survey cosmosen_US
dc.subjectqso absorption systemsen_US
dc.subjecthigh-redshift galaxiesen_US
dc.subjectastronomy & astrophysicsen_US
dc.titleThe Spectrally Resolved Lyman-Alpha Emission Of Three Lyman-Alpha-Selected Field Galaxies At Z Similar To 2.4 From The HETDEX Pilot Surveyen_US

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