J/A+A/693/A252ivo://CDS.VizieR/J/A+A/693/A252doi:10.26093/cds/vizier.36930252CDSHerenz E.C.Schaible A.Laursen P.Runnholm A.Melinder J.,Le Reste AHayes M.J.Oestlin G.Cannon J.Roth M.Saha K.2025-03-03T20:01:25Z2025-01-27T09:17:52ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frgalaxiesspectroscopyvisible-astronomyGas kinematics affect the radiative transfer and escape of hydrogen Lyman-{alpha} (Ly{alpha}) emission from galaxies. We investigate this interplay empirically by relating the ionised gas kinematics of 42 galaxies in the extended Ly{alpha} Reference Sample (eLARS) with their Ly{alpha} escape fractions, f_esc_, Ly{alpha} equivalent widths, EW_Ly{alpha}_, and Ly{alpha} luminosities, L_Ly{alpha}_. To this aim we use PMAS integral-field spectroscopic observations of the Balmer-{alpha} line. Our sample contains 18 rotating discs, 13 perturbed rotators, and 13 galaxies with more complex kinematics. The distributions of f_esc_, EW_Ly{alpha}_, and L_Ly{alpha}_ do not differ significantly between these kinematical classes, but the largest Ly{alpha} observables are found amongst the kinematically complex systems. We find no trends between either f_esc_ or EW_Ly{alpha}_ and kinematic or photometric inclinations. We calculate shearing velocities, v_s, and intrinsic velocity dispersions, {sigma}_v_ (empirically corrected for beam-smearing effects), as global kinematical measures for each galaxy. The sample is characterised by highly turbulent motions (30km/s<~{sigma}_v_<~80km/s) and more than half of the sources show dispersion-dominated kinematics. We uncover clear trends between Ly{alpha} observables and global kinematical statistics: EW_Ly{alpha}_ and L_Ly{alpha}_ correlate with {sigma}_v_, while f_esc_ anti-correlates with v_s_ and v_s_/{sigma}_v_. Moreover, we find, that galaxies with EW_Ly{alpha}_>=20{AA} are characterised by higher {sigma}_v_ and lower v_s_/{sigma}_v_ than galaxies below this threshold. We discuss the statistical importance of v_s_, {sigma}_v_, and v_s_/{sigma}_v_ for regulating the Ly{alpha} observables in comparison to other galaxy parameters. It emerges that {sigma}_v_ is the dominating parameter for regulating EW_Ly{alpha}_ and that is as important as nebular extinction, gas covering fraction, and ionising photon production efficiency in regulating f_esc_. A simple scenario where the starburst age is simultaneously regulating turbulence, EW_Ly{alpha}_, and f_esc_ is not supported by our observations. However, we show that the small-scale distribution of dust appears to be influenced by turbulence in some galaxies. In support of our observational result, we discuss how turbulence is theoretically expected to play a significant role in modulating f_esc_.2025A&A...693A.252Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/693/A252CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/587/A78 : LARS VIII. Spatially resolved Halpha kinematics (Herenz+, 2016)J/A+A/644/A10 : LARS XI. Turbulence Driven Lyman Alpha Escape (Puschnig+, 2020)J/ApJS/266/15 : The Ly{alpha} Reference Sample (LARS). XIV. (Melinder+, 2023)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/693/A252https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/693/A252http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/693/A252https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/693/A252https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/693/A252http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/693/A252GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/693/A252/cubes (List of fits datacubes)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/693/A252/cubes?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/693/A252/cubes?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/693/A252/cubes?GETtext/xml+votable180.050000true242.9252.45750.005555555555555556Cone search capability for table J/A+A/693/A252/vfitmaps (List of fits Kinematic maps)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/693/A252/vfitmaps?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/693/A252/vfitmaps?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/693/A252/vfitmaps?GETtext/xml+votable180.050000true242.9229152.455020.0055555555555555566/6013 6106 6110 6115 6128 6141 7294 7441 7452 7472 7509 7523 10144 10192 10220 11133 11183 11220 11386 11500 11505 11512 11778 11824 11826 11855 11968https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/693/A252?format=asciiOpticaldefaultJ/A+A/693/A252/cubesList of fits datacubesNzNumber of pixels along Z-axismeta.numberintObs.dateObservation datestime.epoch;obsnullablebAWAVLower value of wavelength interval0.1nmem.wlfloatBAWAVUpper value of wavelength interval0.1nmem.wlfloatdAWAVWavelength resolution0.1nmspect.resolutiondoublesizeSize of FITS fileKibytephys.size;meta.fitsintFileNameName of FITS file, in cubes subdirectorymeta.id;meta.fitscharTitleTitle of the FITS filemeta.title;meta.fitscharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right Ascension of center (J2000)pos.eq.ra;meta.mainDEJ2000Declination of center (J2000)pos.eq.dec;meta.mainNxNumber of pixels along X-axismeta.numberintNyNumber of pixels along Y-axismeta.numberintJ/A+A/693/A252/vfitmapsList of fits Kinematic mapssizeSize of FITS fileKibytephys.size;meta.fitsintTitleTitle of the FITS filemeta.title;meta.fitscharFileNameName of FITS file, in vfit_fits subdirectorymeta.id;meta.fitscharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right Ascension of center (J2000)degpos.eq.ra;meta.mainDEJ2000Declination of center (J2000)degpos.eq.dec;meta.mainNxNumber of pixels along X-axismeta.numberintNyNumber of pixels along Y-axismeta.numberint