Journal article
The frequency and properties of young tidal dwarf galaxies in nearby gas-rich groups
Monthly notices of the Royal Astronomical Society, Vol.460(3), pp.2945-2961
08/11/2016
DOI: 10.1093/mnras/stw1162
Abstract
We present high-resolution Giant Metrewave Radio Telescope (GMRT) H i observations and deep Canada-France-Hawaii Telescope (CFHT) optical imaging of two galaxy groups: NGC 4725/47 and NGC 3166/9. These data are part of a multi-wavelength unbiased survey of the gas-rich dwarf galaxy populations in three nearby interacting galaxy groups. The NGC 4725/47 group hosts two tidal knots and one dwarf irregular galaxy (dIrr). Both tidal knots are located within a prominent H i tidal tail, appear to have sufficient mass (M-gas a parts per thousand 10(8) M-aS (TM)) to evolve into long-lived tidal dwarf galaxies (TDGs) and are fairly young in age. The NGC 3166/9 group contains a TDG candidate, AGC 208457, at least three dIrrs and four H i knots. Deep CFHT imaging confirms that the optical component of AGC 208457 is bluer - with a 0.28 mag g - r colour - and a few Gyr younger than its purported parent galaxies. Combining the results for these groups with those from the NGC 871/6/7 group reported earlier, we find that the H i properties, estimated stellar ages and baryonic content of the gas-rich dwarfs clearly distinguish tidal features from their classical counterparts. We optimistically identify four potentially long-lived tidal objects associated with three separate pairs of interacting galaxies, implying that TDGs are not readily produced during interaction events as suggested by some recent simulations. The tidal objects examined in this survey also appear to have a wider variety of properties than TDGs of similar mass formed in current simulations of interacting galaxies, which could be the result of pre- or post-formation environmental influences.
Details
- Title: Subtitle
- The frequency and properties of young tidal dwarf galaxies in nearby gas-rich groups
- Creators
- K. Lee-Waddell - Astronomy and SpaceK. Spekkens - Royal Military College of CanadaP. Chandra - National Centre for Radio AstrophysicsN. Patra - National Centre for Radio AstrophysicsJ. -C. Cuillandre - Atomic Energy and Alternative Energies CommissionJ. Wang - Astronomy and SpaceM. P. Haynes - Cornell UniversityJ. Cannon - Macalester CollegeS. Stierwalt - University of VirginiaJ. Sick - Queen's UniversityR. Giovanelli - Cornell University
- Resource Type
- Journal article
- Publication Details
- Monthly notices of the Royal Astronomical Society, Vol.460(3), pp.2945-2961
- Publisher
- Oxford Univ Press
- DOI
- 10.1093/mnras/stw1162
- ISSN
- 0035-8711
- eISSN
- 1365-2966
- Number of pages
- 17
- Grant note
- Brinson Foundation AST-0607007; AST-1107390 / U.S. NSF; National Science Foundation (NSF) National Sciences and Engineering Research Council of Canada; Natural Sciences and Engineering Research Council of Canada (NSERC)
- Language
- English
- Date published
- 08/11/2016
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984627227202771
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