J/AJ/144/16    The VGS survey of void galaxies from SDSS-DR7    (Kreckel+, 2012)
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Query from: http://vizier.u-strasbg.fr/viz-bin/VizieR?-source=J/AJ/144/16

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Beginning of ReadMe : J/AJ/144/16 Optical and HI properties of galaxies in voids (Kreckel+, 2012) ================================================================================ The Void Galaxy Survey: optical properties and HI morphology and kinematics. Kreckel K., Platen E., Aragon-Calvo M.A., van Gorkom J.H., van de Weygaert R., van der Hulst J.M., Beygu B. <Astron. J., 144, 16 (2012)> =2012AJ....144...16K ================================================================================ ADC_Keywords: H I data ; Redshifts ; Photometry, SDSS ; Photometry, RI ; Galaxies, spectra ; Surveys Keywords: galaxies: evolution - galaxies: formation - galaxies: kinematics and dynamics - galaxies: structure - large-scale structure of Universe - radio lines: galaxies Abstract: We have carefully selected a sample of 60 galaxies that reside in the deepest underdensities of geometrically identified voids within the Sloan Digital Sky Survey. HI imaging of 55 galaxies with the Westerbork Synthesis Radio Telescope reveals morphological and kinematic signatures of ongoing interactions and gas accretion. We probe a total volume of 485Mpc^3^ within the voids, with an angular resolution of 8kpc at an average distance of 85Mpc. We reach column density sensitivities of 5x10^19^/cm^-2^, corresponding to an HI mass limit of 3x10^8^M_sun_. We detect HI in 41 galaxies, with total masses ranging from 1.7x10^8^ to 5.5x10^9^M_sun_. The upper limits on the 14 non-detections are not inconsistent with their luminosities, given their expected HI mass-to-light ratios. We find that the void galaxies are generally gas-rich, low-luminosity, blue disk galaxies, with optical and HI properties that are not unusual for their luminosity and morphology. The sample spans a range of absolute magnitudes (-16.1>M_r_>-20.4) and colors (0.06<g-r<0.87), and includes disk and irregular galaxies. We also identify three as early-type galaxies, all of which are not detected in HI. All galaxies have stellar masses less than 3x10^10^M_sun_, and many have kinematic and morphological signs of ongoing gas accretion, suggesting that the void galaxy population is still in the process of assembling. The small-scale clustering in the void, within 600kpc and 200km/s, is similar to that in higher density regions, and we identify 18 HI-rich neighboring galaxies in the voids. Most are within 100kpc and 100km/s of the targeted galaxy, and we find no significant population of HI-rich low-luminosity galaxies filling the voids, contrary to what is predicted by simulations. Description: We have selected a sample of 60 galaxies using voids identified within the Sloan Digital Sky Survey Data Release 7 (SDSS-DR7, Cat. II/294, superseded by Cat. V/139). We observed a total of 55 of the 60 galaxies at the Westerbork Synthesis Radio Telescope (WSRT) between 2006 and 2010, with a velocity resolution of 8.6km/s.