Journal article
An extremely optically dim tidal feature in the gas-rich interacting galaxy group NGC 871/NGC 876/NGC 877
Monthly notices of the Royal Astronomical Society, Vol.443(4), pp.3601-3611
10/01/2014
DOI: 10.1093/mnras/stu1345
Abstract
We present Giant Metrewave Radio Telescope H I observations and deep Canada-France-Hawaii Telescope (CFHT) MegaCam optical images of the gas-rich interacting galaxy group NGC 871/NGC 876/NGC 877 (hereafter NGC 871/6/7). Our H Igh-resolution data sets provide a census of the H I and stellar properties of the detected gas-rich group members. In addition to a handful of spiral, irregular and dwarf galaxies, tH Is group harbours an intriguing H I feature, AGC 749170, that has a gas mass of similar to 10(9.3)M circle dot, a dynamical-to-gas mass ratio of similar to 1 (assuming that the cloud is rotating and in dynamical equilibrium) and no optical counterpart in previous imaging. Our observations have revealed a faint feature in the CFHT g' and r' bands; if it is physically associated with AGC 749170, the latter has M/L-g > 1000M circle dot/L circle dot as well as a H Igher metallicity (estimated using photometric colours) and a significantly younger stellar population than the other low-mass gas-rich group members. These properties, as well as its spectral and spatial location with respect to its suspected parent galaxies, strongly indicate a tidal origin for AGC 749170. Overall, the H I properties of AGC 749170 resemble those of other optically dark/dim clouds that have been found in groups. These clouds could represent a class of relatively long-lived H I-rich tidal remnants that survive in intermediate-density environments.
Details
- Title: Subtitle
- An extremely optically dim tidal feature in the gas-rich interacting galaxy group NGC 871/NGC 876/NGC 877
- Creators
- K. Lee-Waddell - Royal Military College of CanadaK. Spekkens - Royal Military College of CanadaJ. -C. Cuillandre - Canada–France–Hawaii TelescopeJ. Cannon - Macalester CollegeM. P. Haynes - Cornell UniversityJ. Sick - Queen's UniversityP. Chandra - National Centre for Radio AstrophysicsN. Patra - National Centre for Radio AstrophysicsS. Stierwalt - University of VirginiaR. Giovanelli - Cornell University
- Resource Type
- Journal article
- Publication Details
- Monthly notices of the Royal Astronomical Society, Vol.443(4), pp.3601-3611
- Publisher
- Oxford Univ Press
- DOI
- 10.1093/mnras/stu1345
- ISSN
- 0035-8711
- eISSN
- 1365-2966
- Number of pages
- 11
- Grant note
- 1211683 / Direct For Mathematical & Physical Scien; National Science Foundation (NSF); NSF - Directorate for Mathematical & Physical Sciences (MPS) Brinson Foundation AST-0607007; AST-1107390 / US 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
- 10/01/2014
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984627242602771
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