Browsing Physics & Atmospheric Science by Author "Ibata, R."
Now showing items 1-13 of 13
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The Discovery of Remote Globular Clusters in M33
(2009-06-20)We present the discovery of four remote star clusters in M33, one of which is of an extended nature. Three of the clusters were discovered using survey data from the Isaac Newton Telescope Wide-Field Camera while one was ... -
Do submillimeter galaxies really trace the most massive dark matter halos? Discovery of a high-z cluster in a highly active phase of evolution
(2009-01-20)We present detailed observations of a z~1.99 cluster of submillimeter galaxies (SMGs), discovered as the strongest redshift spike in our entire survey of ~100 SMGs across 800 square arcmin. It is the largest blank-field ... -
The globular cluster NGC 2419: a crucible for theories of gravity
(2011-06-24)We present the analysis of a kinematic data set of stars in the globular cluster NGC 2419, taken with Keck/DEIMOS. Combined with a reanalysis of deep HST and Subaru imaging data, which provide an accurate luminosity profile ... -
The Haunted Halos of Andromeda and Triangulum: A panorama of galaxy formation in action
(2007-12-20)We present a deep photometric survey of M31, conducted with the CFHT and INT, covering the inner 50 kpc of the galaxy, the Southern quadrant out to 150 kpc, and extending to M33. This is the first systematic panoramic study ... -
The kinematic footprints of five stellar streams in Andromeda's halo
(2008-10)(abridged) We present a spectroscopic analysis of five stellar streams (`A', `B', `Cr', `Cp' and `D') as well as the extended star cluster, EC4, which lies within streamC, all discovered in the halo of M31 from our ... -
A kinematically selected, metal-poor stellar halo in the outskirts of M31
(2006-12-10)We present evidence for a metal-poor, [Fe/H]$\sim-1.4$ $\sigma$=0.2 dex, stellar halo component detectable at radii from 10 kpc to 70 kpc, in our nearest giant spiral neighbor, the Andromeda galaxy. This metal-poor sample ... -
News from the Galactic suburbia: the chemical composition of the remote globular cluster NGC 2419
(2012-08-01)We present the chemical analysis of 49 giant stars of the globular cluster NGC 2419, using medium resolution spectra collected with the multi-object spectrograph DEIMOS@Keck. Previous analysis of this cluster revealed a ... -
On the accretion origin of a vast extended stellar disk around the Andromeda galaxy
(2005-11-20)We present the discovery of an inhomogenous, low-surface brightness, extended disk-like structure around the Andromeda galaxy (M31) based on a large kinematic survey of more than 2800 stars with the Keck/DEIMOS spectrograph. ... -
A spectroscopic survey of EC4, an Extended Cluster in Andromeda's halo
(2009-03-26)We present a spectroscopic survey of candidate red giant branch stars in the extended star cluster, EC4, discovered in the halo of M31 from our CFHT/MegaCam survey, overlapping the tidal streams, Stream Cp and Stream Cr. ... -
Strangers in the night: Discovery of a dwarf spheroidal galaxy on its first Local Group infall
(2007-06-20)We present spectroscopic observations of the AndXII dwarf spheroidal galaxy using DEIMOS/Keck-II, showing it to be moving rapidly through the Local Group (-556 km/s heliocentric velocity, -281 km/s relative to Andromeda ... -
The structure of star clusters in the outer halo of M31
(2012-02-09)We present a structural analysis of halo star clusters in M31 based on deep Hubble Space Telescope (HST) Advanced Camera for Surveys (ACS) imaging. The clusters in our sample span a range in galactocentric projected distance ... -
Taking measure of the Andromeda halo: a kinematic analysis of the giant stream surrounding M31
(2004-06)We present a spectroscopic survey of the giant stellar stream found in the halo of the Andromeda galaxy. Taken with the DEIMOS multi-object spectrograph on the Keck2 telescope, these data display a narrow velocity dispersion ... -
The tidal trail of NGC205?
(2004-07)Using data taken as part of the Isaac Newton Telescope Wide Field Camera (INT WFC) survey of M31, we have identified an arc-like overdensity of blue, presumably metal-poor, red giant branch stars in the north-west quadrant ...
