Metallicities of Tidal Dwarf Candidates in the Debris of Hickson Compact Groups

Details Metallicities of Tidal Dwarf Candidates in the Debris of Hickson Compact Groups Metallicities of Tidal Dwarf Candidates in the Debris of Hickson Compact Groups

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aas...19110512g&link_type=abstract

American Astronomical Society, 191st AAS Meeting, #105.12; Bulletin of the American Astronomical Society, Vol. 29, p.1379

Astronomy and Astrophysics

Astronomy

1

Scientific paper

Moderately deep CCD images of Hickson compact groups have shown the existence of extended objects in the tidal tails of these groups. Hunsberger et al. (1996) indicate that these extended objects are likely to be drawf galaxies. To test this theory and determine the nature of these objects, long slit spectra have been obtained, and relative fluxes in important emission lines have been measured. From these fluxes, the metallicities and densities of the objects are inferred. Metallicity is computed using the O/H ratio ([O II]lambda lambda 3726,3729 + [O III]lambda lambda 4959,5007) / Hβ , and the density is determined using the ratio [S II]lambda 6716 / [S II]lambda 6731. The metallicities of the tidal dwarf candidates are compared with the expected metallicities for dwarf galaxies and the metallicities of the outskirts of their parent spiral galaxies. Also, the relationship between metallicity and the relative position of the objects in the tidal debris is explored. The spectra of these ojects are presented along with the metallicity and density results.

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