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ONLY THE LONELY: H IIMAGING OF VOIDGALAXIES Kathryn KreckelErwin PlatenMiguel A. Aragón-Calvo2010 год

ONLY THE LONELY: H I IMAGING OF VOID GALAXIES
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Аннотация: Void galaxies, residing within the deepest underdensities of the Cosmic Web, present an ideal population for the study of galaxy formation and evolution in an environment undisturbed by the complex processes modifying galaxies in clusters and groups, as well as provide an observational test for theories of cosmological structure formation. We have completed a pilot survey for the H i imaging aspects of a new Void Galaxy Survey (VGS), imaging 15 void galaxies in H i in local (d < 100 Mpc) voids. H i masses range from 3.5 × 108 to 3.8 × 109 M☉, with one nondetection with an upper limit of 2.1 × 108 M☉. Our galaxies were selected using a structural and geometric technique to produce a sample that is purely environmentally selected and uniformly represents the void galaxy population. In addition, we use a powerful new backend of the Westerbork Synthesis Radio Telescope that allows us to probe a large volume around each targeted galaxy, simultaneously providing an environmentally constrained sample of fore- and background control samples of galaxies while still resolving individual galaxy kinematics and detecting faint companions in H i. This small sample makes up a surprisingly interesting collection of perturbed and interacting galaxies, all with small stellar disks. Four galaxies have significantly perturbed H i disks, five have previously unidentified companions at distances ranging from 50 to 200 kpc, two are in interacting systems, and one was found to have a polar H i disk. Our initial findings suggest void galaxies are a gas-rich, dynamic population which present evidence of ongoing gas accretion, major and minor interactions, and filamentary alignment despite the surrounding underdense environment.
Год издания: 2010
Авторы: Kathryn Kreckel, Erwin Platen, Miguel A. Aragón-Calvo, J. H. van Gorkom, Rien van de Weygaert, J. M. van der Hulst, K. Kovač, Ching-Wa Yip, P. J. E. Peebles
Издательство: Institute of Physics
Источник: The Astronomical Journal
Ключевые слова: Galaxies: Formation, Evolution, Phenomena, Astronomy and Astrophysical Research, Gamma-ray bursts and supernovae
Другие ссылки: The Astronomical Journal (PDF)
The Astronomical Journal (HTML)
arXiv (Cornell University) (PDF)
arXiv (Cornell University) (HTML)
arXiv (Cornell University) (PDF)
arXiv (Cornell University) (HTML)
arXiv (Cornell University) (PDF)
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