Kinematics and Metallicity of 25 Globular Clusters in M81

Details Kinematics and Metallicity of 25 Globular Clusters in M81 Kinematics and Metallicity of 25 Globular Clusters in M81

Aug 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aj....110..620p&link_type=abstract

Astronomical Journal v.110, p.620

Astronomy and Astrophysics

Astronomy

43

Galaxies: Individual: M81, Globular Clusters: General

Scientific paper

We have obtained spectra for 82 bright globular cluster candidates in the M81 field. We use the relative strengths of Hδ, Ca I λ4227, and Fe I λ4045 absorption lines to distinguish stellar images of M81 globular clusters from stars in the Milky Way. We confirm 25 bona fide M81 globulars, 3 of which were previously detected by H. Harris, R. Schommer, and J. Huchra [cf. Brodie & Huchra, ApJ, 379, 157 (1991)]. The line-of-sight velocity dispersion, corrected for the observational error +/-50 km s^-1^, is 152 km s^-1^. The integrated mass of M81 derived by the projected mass method is M ~ 3.1 +/- 1.0 x 10^11^ M_sun_ and thus M/L_B_T__^0^ ~ 19 +/- 6 M_sun_/L_sun_, within ~20 kpc. The above estimates assume an isotropic velocity ellipsoid and a spherical distribution of matter. The mean metallicity is = - 1.48+/-0.19. This value agrees well with the relation between the mean metallicity of a cluster system and the luminosity of the parent galaxy (BH).

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