Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-01-09
Mon.Not.Roy.Astron.Soc.Lett. 367 (2006) L69-L73
Astronomy and Astrophysics
Astrophysics
5 figures, accepted for publication in MNRAS
Scientific paper
10.1111/j.1745-3933.2006.00142.x
As part of our radial velocity survey of low Galactic latitude structures that surround the Galactic disc, we report the detection of the so called Monoceros Ring in the foreground of the Carina dwarf galaxy at Galactic coordinates (l,b)=(260,-22) based on VLT/FLAMES observations of the dwarf galaxy. At this location, 20 degrees in longitude greater than previous detections, the Ring has a mean radial velocity of 145+/-5 km/s and a velocity dispersion of only 17+/-5 km/s. Based on Keck/DEIMOS observations, we also determine that the Ring has a mean radial velocity of -75+/-4 km/s in the foreground of the Andromeda galaxy at (l,b)\sim(122,-22), along with a velocity dispersion of 26+/-3 km/s. These two kinematic detections are both highly compatible with known characteristics of the structure and, along with previous detections provide radial velocity values of the Ring over the 120
Bellazzini Michele
Chapman Sandra
Conn Blair C.
Ibata Rodrigo A.
Irwin Mary Jane
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