ar X iv : a st ro - p h / 06 11 89 6 v 1 2 9 N ov 2 00 6 Spectroscopy of Globular Clusters out to Large Radius in the Sombrero
نویسندگان
چکیده
We present new velocities for 62 globular clusters in M104 (NGC 4594, the Sombrero Galaxy), 56 from 2dF on the AAT and 6 from Hydra on WIYN. Combined with previous data, we have a total sample of 108 M104 globular cluster velocities, extending to 20 radius (∼ 60 kpc), along with BVR photometry for each of these. We use this wide-field dataset to study the globular cluster kinematics and dark matter content of M104 out to 10 radius (30 kpc). We find no rotation in the globular cluster system. The edge-on nature of M104 makes it unlikely that there is strong rotation which is face-on and hence unobserved; thus, the absence of rotation over our large radial range appears to be an intrinsic feature of the globular cluster system in M104. We discuss ways to explain this low rotation, including the possibility that angular momentum has been transferred NSF Astronomy & Astrophysics Postdoctoral Fellow
منابع مشابه
ar X iv : a st ro - p h / 02 11 41 1 v 1 1 8 N ov 2 00 2 2 dF Spectroscopy of M 104 Globular Clusters
We present preliminary results of 2dF spectroscopy of globular clusters in The Sombrero (M104). We find 56 new clusters, and compile a total sample of 103 velocities combined with previous data. Our 2dF data extend out to 20 arcmin radius (∼50 kpc), much further than previous studies. In the combined sample, we tentatively find a steep drop in the velocity dispersion with radius, which might po...
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