期刊
ASTROPHYSICAL JOURNAL
卷 705, 期 1, 页码 723-738出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/705/1/723
关键词
galaxies: abundances; galaxies: dwarf; galaxies: individual (Garland, KDG 61, UGC 5336); galaxies: interactions
资金
- NSF [AST05-06054]
- National Science Foundation ( United States)
- Science and Technology Facilities Council ( United Kingdom)
- National Research Council ( Canada)
- CONICYT ( Chile)
- Australian Research Council ( Australia)
- Ministerio da Ciencia e Tecnologia ( Brazil)
- Ministerio de Ciencia, Tecnologia e Innovacion Productiva ( Argentina)
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] lambda 4363 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.
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