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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 660857.0, MPI für Astronomie / Publikationen_mpia
The Void Galaxy Survey: Optical properties and H I morphology and kinematics
Authors:Kreckel, K.; Platen, E.; Aragón-Calvo, M. A.; van Gorkom, J. H.; van de Weygaert, R.; van der Hulst, J. M.; Beygu, B.
Date of Publication (YYYY-MM-DD):2012
Journal Abbrev.:The Astronomical Journal
Issue / Number:1
Start Page:id. 16
Audience:Not Specified
Abstract / Description: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. H I 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 485 Mpc3 within the voids, with an angular resolution of 8 kpc at an average distance of 85 Mpc. We reach column density sensitivities of 5 × 1019 cm-2, corresponding to an H I mass limit of 3 × 108 M &sun;. We detect H I in 41 galaxies, with total masses ranging from 1.7 × 108 to 5.5 × 109 M &sun;. The upper limits on the 14 non-detections are not inconsistent with their luminosities, given their expected H I mass-to-light ratios. We find that the void galaxies are generally gas-rich, low-luminosity, blue disk galaxies, with optical and H I properties that are not unusual for their luminosity and morphology. The sample spans a range of absolute magnitudes (-16.1 > Mr > -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 H I. All galaxies have stellar masses less than 3 × 1010 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 600 kpc and 200 km s-1, is similar to that in higher density regions, and we identify 18 H I-rich neighboring galaxies in the voids. Most are within 100 kpc and 100 km s-1 of the targeted galaxy, and we find no significant population of H I-rich low-luminosity galaxies filling the voids, contrary to what is predicted by simulations.
Free Keywords:galaxies: evolution; galaxies: formation; galaxies: kinematics and dynamics; galaxies: structure; large-scale structure of Universe; radio lines: galaxies
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
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