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Please use this identifier to cite or link to this item: http://hdl.handle.net/10481/28381

Title: Properties of bulgeless disk galaxies: I atomic gas
Authors: Watson, Linda C.
Schinnerer, Eva
Martini, Paul
Böker, Torsten
Lisenfeld, Ute
Issue Date: 2011
Abstract: We study the neutral hydrogen properties of a sample of 20 bulgeless disk galaxies (Sd - Sdm Hubble types), an interesting class that can be used to constrain galaxy formation and evolution, especially the role of mergers versus internal processes. Our sample is composed of nearby (within 32 Mpc), moderately inclined galaxies that bracket the circular velocity of 120 km/s, which has been found to be associated with a transition in dust scale heights in edge-on, late-type disks. Here we present HI channel maps, line profiles, and integrated intensity maps. We also derive kinematic parameters, including the circular velocity, from rotation curve analyses and calculate the integrated HI flux and HI mass for each galaxy in the sample. Three of the 20 galaxies in our sample have kinematically distinct outer components with major axes that differ by 30 - 90 degrees from the main disk. These distinct outer components may be due to a recent interaction, which would be somewhat surprising because the disks do not contain bulges. We will use the data products and derived properties in subsequent investigations into star formation and secular evolution in bulgeless disks with circular velocities above and below 120 km/s.
Sponsorship: L.C.W. gratefully acknowledges support from an NSF Graduate Research Fellowship. P.M. is grateful for support from the NSF via award AST-0705170. U.L. acknowledges financial support from the research project AYA2007-67625-C02-02 from the Spanish Ministerio de Ciencia y Educación and from the Junta de Andalucía.
Publisher: American Astronomical Society; Institute of Physics
Keywords: ISM
Radio lines
URI: http://hdl.handle.net/10481/28381
ISSN: 0067-0049
Rights : Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License
Citation: Watson, L.C.; et al. Properties of bulgeless disk galaxies: I atomic gas. Astrophysical Journal Supplement Series, 194(2): 36, (2011). [] 751(2): 123 (2012). [http://hdl.handle.net/10481/28381]
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