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The dwarf galaxy population as revealed by ALFALFA

Published online by Cambridge University Press:  30 October 2019

Elizabeth A. K. Adams Open the ORCID record for Elizabeth A. K. Adams [Opens in a new window] ,
Catherine Ball ,
John M. Cannon ,
Martha P. Haynes ,
Alec Hirschauer Open the ORCID record for Alec Hirschauer [Opens in a new window] ,
Riccardo Giovanelli ,
William Janesh ,
Steven Janowiecki Open the ORCID record for Steven Janowiecki [Opens in a new window] ,
Luke Leisman  and
Kristen B. W. McQuinn
...Show all authors
Elizabeth A. K. Adams
Affiliation:
ASTRON, Netherlands Institute for Radio Astronomy, Postbus 2, 7900 AA Dwingeloo, The Netherlands email: adams@astron.nl Kapteyn Astronomical Institute, University of Groningen, Postbus 800, 9700 AV Groningen, the Netherlands
Catherine Ball
Affiliation:
Department of Physics and Astronomy, Macalaster College, 1600 Grand Avenue, Saint Paul, MN 55105, USA
John M. Cannon
Affiliation:
Department of Physics and Astronomy, Macalaster College, 1600 Grand Avenue, Saint Paul, MN 55105, USA
Martha P. Haynes
Affiliation:
Cornell Center for Astrophysics and Planetary Science, Space Sciences Building, Cornell UniversityIthaca, NY 14853, USA
Alec Hirschauer
Affiliation:
Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA
Riccardo Giovanelli
Affiliation:
Cornell Center for Astrophysics and Planetary Science, Space Sciences Building, Cornell UniversityIthaca, NY 14853, USA
William Janesh
Affiliation:
Department of Astronomy, Indiana University, 727 East Third Street, Bloomington, IN 47405, USA
Steven Janowiecki
Affiliation:
International Centre for Radio Astronomy Research (ICRAR), University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia
Luke Leisman
Affiliation:
Department of Physics and Astronomy, Valparaiso University, Neils Science Center, 1610 Campus Drive East, Valparaiso, IN 46383, USA
Kristen B. W. McQuinn
Affiliation:
Department of Astronomy, The University of Texas at Austin, 2515 Speedway, Stop C1400, Austin, TX 78712-1205, USA
Katherine L. Rhode
Affiliation:
Department of Astronomy, Indiana University, 727 East Third Street, Bloomington, IN 47405, USA
John J. Salzer
Affiliation:
Department of Astronomy, Indiana University, 727 East Third Street, Bloomington, IN 47405, USA
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Abstract

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The combination of sensitivity and large sky coverage of the ALFALFA HI survey has enabled the detection of difficult to observe low mass galaxies in large numbers, including dwarf galaxies overlooked in optical surveys. Three different, but connected, studies of dwarf galaxies from the ALFALFA survey are of particular interest: SHIELD (Survey of HI in Extremely Low-mass Dwarfs), candidate gas-rich ultra-faint dwarf galaxies, and the (Almost) Dark population. SHIELD is a systematic multiwavelength study of all dwarf galaxies from ALFALFA with MHI < 107.2M⊙ and clear optical counterparts. Candidate gas-rich ultra-faint dwarf galaxies extend the dwarf galaxy population to even lower masses. These galaxies are identified as isolated HI clouds with no discernible optical counterpart but subsequent observations reveal that some are extremely faint, gas-dominated galaxies. Leo P, discovered first as an HI detection, and then found to be an actively star-forming galaxy, bridges the gap between these candidate galaxies and the SHIELD sample. The (Almost) Dark sample consists of galaxies whose optical counterparts are overlooked in current optical surveys but which are clear detections in ALFALFA. This sample includes field gas-rich ultra-diffuse galaxies. Coma P, with a peak surface brightness of only ∼26.4 mag arcsec−2 in g’, demonstrates the sort of extreme low surface brightness galaxy that can be discovered in an HI survey.

Keywords

galaxies: dwarfgalaxies: ISMradio lines: galaxiessurveys
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium S344: Dwarf Galaxies: From the Deep Universe to the Present , August 2018 , pp. 464 - 467
Copyright
© International Astronomical Union 2019 

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