Sign on

SAO/NASA ADS Astronomy Abstract Service


· Find Similar Abstracts (with default settings below)
· Electronic Refereed Journal Article (HTML)
· Full Refereed Journal Article (PDF/Postscript)
· arXiv e-print (arXiv:0910.3162)
· References in the article
· Citations to the Article (1) (Citation History)
· Refereed Citations to the Article
· SIMBAD Objects (32)
· Also-Read Articles (Reads History)
·
· Translate This Page
Title:
Chemical Abundances of Seven Irregular and Three Tidal Dwarf Galaxies in the M81 Group
Authors:
Croxall, Kevin V.; van Zee, Liese; Lee, Henry; Skillman, Evan D.; Lee, Janice C.; Côté, Stéphanie; Kennicutt, Robert C.; Miller, Bryan W.
Affiliation:
AA(Department of Astronomy, Indiana University, 727 East 3rd Street, Bloomington, IN 47405, USA ), AB(Department of Astronomy, Indiana University, 727 East 3rd Street, Bloomington, IN 47405, USA ), AC(Gemini Observatory, Southern Operations Center, Casilla 603, La Serena, Chile ), AD(Astronomy Department, University of Minnesota, Minneapolis, MN 55455, USA ), AE(Observatories of the Carnegie Institution of Washington, 813 Santa Barbara Street, Pasadena, CA, 91101, USA ; Hubble Fellow.; ), AF(Canadian Gemini Office, Herzberg Institute of Astrophysics, National Reseach Council of Canada, 5071 West Saanich Road, Victoria, BC V9E 2E7, Canada ), AG(Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA, UK ), AH(Gemini Observatory, Southern Operations Center, Casilla 603, La Serena, Chile )
Publication:
The Astrophysical Journal, Volume 705, Issue 1, pp. 723-738 (2009). (ApJ Homepage)
Publication Date:
11/2009
Origin:
IOP
ApJ Keywords:
galaxies: abundances, galaxies: dwarf, galaxies: individual: Garland KDG 61 UGC 5336, galaxies: interactions
DOI:
10.1088/0004-637X/705/1/723
Bibliographic Code:
2009ApJ...705..723C

Abstract

We have derived nebular abundances for 10 dwarf galaxies belonging to the M81 Group, including several galaxies which do not have abundances previously reported in the literature. For each galaxy, multiple H II regions were observed with GMOS-N at the Gemini Observatory in order to determine abundances of several elements (oxygen, nitrogen, sulfur, neon, and argon). For seven galaxies, at least one H II region had a detection of the temperature sensitive [O III] λ4363 line, allowing a "direct" determination of the oxygen abundance. No abundance gradients were detected in the targeted galaxies, and the observed oxygen abundances are typically in agreement with the well-known metallicity-luminosity relation. However, three candidate "tidal dwarf" galaxies lie well off this relation: UGC 5336, Garland, and KDG 61. The nature of these systems suggests that UGC 5336 and Garland are indeed recently formed systems, whereas KDG 61 is most likely a dwarf spheroidal galaxy which lies along the same line of sight as the M81 tidal debris field. We propose that these H II regions formed from previously enriched gas which was stripped from nearby massive galaxies (e.g., NGC 3077 and M81) during a recent tidal interaction.
Bibtex entry for this abstract   Preferred format for this abstract (see Preferences)

   

Find Similar Abstracts:

Use: Authors
Title
Keywords (in text query field)
Abstract Text
Return: Query Results Return    items starting with number
Query Form
Database: Astronomy
Physics
arXiv e-prints