J/ApJ/751/29: Resource Record Summary

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Resource Record Summary

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Ly{alpha} profiles of LAEs at z=3.1

Short name: J/ApJ/751/29 IVOA Identifier: ivo://CDS.VizieR/J/ApJ/751/29 DOI (Digital Object Identifier): 10.26093/cds/vizier.17510029 Publisher: CDS[+]ivo://CDS[Pub. ID] More Info: https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/751/29 VO Compliance: Level 2: This is a VO-compliant resource.	Status: active Registered: 2014 Jan 29 09:44:25Z
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Description

We present the results of the observations of the Ly{alpha} line profiles of 91 emission-line galaxies at z=3.1 with a spectral resolution of {lambda}/{delta}{lambda}(FWHM){approx}1700 or 180km/s. A significant fraction of ~50% of the observed objects show the characteristic double peaks in their Ly{alpha} profile. The red peak is much stronger than the blue one for most of the cases. The red peaks themselves also show weak but significant asymmetry and their widths are correlated with the velocity separation of the red and the blue peaks. This implies that the peaks are not isolated multiple components with different velocities but parts of a single line that are modified by the absorption and/or scattering by the associated neutral hydrogen gas. The characteristic profile can be naturally explained by scattering in the expanding shell of the neutral hydrogen surrounding the Ly{alpha} emitting region while the attenuation by the intergalactic medium should also be considered. Our results suggest that the star formation in these Ly{alpha} emitters are dominated by young burst-like events that produce the intrinsic Ly{alpha} emission as well as the gas outflow.

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[+]	Custom Service
	This is service that does not comply with any IVOA standard but instead provides access to special capabilities specific to this resource. VO Compliance: Level 2: This is a VO-compliant resource. Available endpoints for this service interface: Interactive web page: http://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/751/29

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