THE VOID GALAXY SURVEY: OPTICAL PROPERTIES AND H I MORPHOLOGY AND KINEMATICS
- Department of Astronomy, Columbia University, Mail Code 5246, 550 West 120th Street, New York, NY 10027 (United States)
- Kapteyn Astronomical Institute, University of Groningen, P.O. Box 800, 9700 AV Groningen (Netherlands)
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 Mpc{sup 3} within the voids, with an angular resolution of 8 kpc at an average distance of 85 Mpc. We reach column density sensitivities of 5 Multiplication-Sign 10{sup 19} cm{sup -2}, corresponding to an H I mass limit of 3 Multiplication-Sign 10{sup 8} M{sub Sun }. We detect H I in 41 galaxies, with total masses ranging from 1.7 Multiplication-Sign 10{sup 8} to 5.5 Multiplication-Sign 10{sup 9} M{sub 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 > M{sub r} > -20.4) and colors (0.06
- OSTI ID:
- 22034420
- Journal Information:
- Astronomical Journal (New York, N.Y. Online), Vol. 144, Issue 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1538-3881
- Country of Publication:
- United States
- Language:
- English
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