Journal article
(Almost) Dark Galaxies in the ALFALFA Survey: Isolated HI-bearing Ultra-diffuse Galaxies
The Astrophysical journal, Vol.842(2), 133
06/20/2017
DOI: 10.3847/1538-4357/aa7575
Abstract
We present a sample of 115 very low optical surface brightness, highly extended, H I-rich galaxies carefully selected from the ALFALFA survey that have similar optical absolute magnitudes, surface brightnesses, and radii to recently discovered "ultra-diffuse" galaxies (UDGs). However, these systems are bluer and have more irregular morphologies than other UDGs, are isolated, and contain significant reservoirs of H I. We find that while these sources have normal star formation rates for H I-selected galaxies of similar stellar mass, they have very low star formation efficiencies. We further present deep optical and H I-synthesis follow-up imaging of three of these H I-bearing ultra-diffuse sources. We measure H I diameters extending to similar to 40 kpc, but note that while all three sources have large H I diameters for their stellar mass, they are consistent with the H I mass-H I radius relation. We further analyze the H I velocity widths and rotation velocities for the unresolved and resolved sources, respectively, and find that the sources appear to inhabit halos of dwarf galaxies. We estimate spin parameters, and suggest that these sources may exist in high spin parameter halos, and as such may be potential H I-rich progenitors to the ultra-diffuse galaxies observed in cluster environments.
Details
- Title: Subtitle
- (Almost) Dark Galaxies in the ALFALFA Survey: Isolated HI-bearing Ultra-diffuse Galaxies
- Creators
- Lukas Leisman - Cornell UniversityMartha P. Haynes - Cornell UniversitySteven Janowiecki - International Centre for Radio Astronomy ResearchGregory Hallenbeck - Union CollegeGyula Jozsa - SKA South Africa Radio Astron Res Grp, 3rd Floor,Pk,Pk Rd, ZA-7405 Pinelands, South AfricaRiccardo Giovanelli - Cornell UniversityElizabeth A. K. Adams - Netherlands Institute for Radio AstronomyDavid Bernal Neira - Universidad de Los AndesJohn M. Cannon - Macalester CollegeWilliam F. Janesh - Indiana University BloomingtonKatherine L. Rhode - Indiana University BloomingtonJohn J. Salzer - Indiana University Bloomington
- Resource Type
- Journal article
- Publication Details
- The Astrophysical journal, Vol.842(2), 133
- Publisher
- Iop Publishing Ltd
- DOI
- 10.3847/1538-4357/aa7575
- ISSN
- 0004-637X
- eISSN
- 1538-4357
- Number of pages
- 17
- Grant note
- AST-0607007; AST-1107390; AST-1211683; AST-1615483 / NSF; National Science Foundation (NSF) Max Planck Society U.S. Department of Energy; United States Department of Energy (DOE) National Aeronautics and Space Administration; National Aeronautics & Space Administration (NASA) Brinson Foundation Higher Education Funding Council for England; UK Research & Innovation (UKRI); Higher Education Funding Council for England (HEFCE) Japanese Monbukagakusho; Ministry of Education, Culture, Sports, Science and Technology, Japan (MEXT) NWO; Netherlands Organization for Scientific Research (NWO) National Science Foundation; National Science Foundation (NSF) DP150101734 / Australian Research Councils; Australian Research Council Alfred P. Sloan Foundation TOP1EW.14.105 / Netherlands Organisation for Scientific Research (NWO); Netherlands Organization for Scientific Research (NWO) Office of the Vice President for Research, Universidad de los Andes
- Language
- English
- Date published
- 06/20/2017
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984627344802771
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