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For refcode 1997MNRAS.284..376B:
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Copyright by Royal Astronomical Society. 1997MNRAS.284..376B Kinematics and metallicities of globular clusters in M104 T. J. Bridges, K. M. Ashman, S. E. Zepf, D. Carter, D. A. Hanes, R. M. Sharples and J. J. Kavelaars Accepted 1996 August 16. Received 1996 July 31; in original form 1996 May 13 ABSTRACT We have obtained spectra for globular cluster candidates in M104 with the Low Dispersion Survey Spectrograph (LDSS-2) on the William Herschel Telescope, confirming 34 objects as M104 globular clusters. We find a cluster velocity dispersion of ~260 km s^-1^, and the projected mass estimator gives a mass of 5.0 (3.5,6.7) x 10^11^ M_sun_ for M104 within a projected radius of ~330 arcsec (14 kpc for D = 8.55 Mpc). Our best estimate for the mass-to-light ratio is M/L_vt_ = 16^+5.5^_-5.0_ within the same radius. Considering all of the possible sources of uncertainty, we find a lower limit of M/L_v_ = 5.3, which is larger than the M/L_v_ ratio found from rotation curve analyses inside 180 arcsec. We thus conclude that the mass-to-light ratio increases with radius, or in other words that M104 possesses a dark matter halo. There is a marginal detection of rotation in the M104 cluster system at the 92.5 per cent confidence level; larger samples will be needed to investigate this possibility. Interestingly, the M104 globular cluster and planetary nebulae (PNe) kinematics are roughly consistent inside ~100 arcsec. Finally, we find a mean cluster metallicity of [Fe/H] = -0.70 +/- 0.3, which is more typical of clusters in giant elliptical (gE)/cD galaxies than it is of clusters in other spirals. Key words: galaxies: haloes - galaxies: individual: M104 - galaxies: kinematics and dynamics - galaxies: spiral - galaxies: star clusters.
Retrieve 87 NED objects in this reference.
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