A spectroscopic confirmation of the Bootes II dwarf spheroidal (2008)
Koch, A., Wilkinson, M. I., Kleyna, J. T., Irwin, M., Zucker, D. B., Belokurov, V., ...
We present a new suite of photometric and spectroscopic data for the faint Bootes II dwarf spheroidal galaxy candidate. Our deep photometry, obtained with the INT/WFC, suggests a distance of 46 kpc...
Koch, A., Grebel, E. K., Gilmore, G. F., Wyse, R. F. G., Kleyna, J. T., Harbeck, D. R., ...
We have obtained high-resolution spectroscopy of ten red giants in the Carina dwarf spheroidal (dSph) with UVES at the ESO/VLT. Here we present the abundances of O,Na,Mg,Si,Ca,Ti and Fe. By comparing...
Black holes and core expansion in massive star clusters (2008)
Mackey, A. D., Wilkinson, M. I., Davies, M. B., Gilmore, G. F.
We present the results from realistic N-body modelling of massive star clusters in the Magellanic Clouds. We have computed eight simulations with N ~ 10^5 particles; six of these were evolved for at...
Modelling the dynamical evolution of the Bootes dwarf spheroidal galaxy (2008)
Fellhauer, M., Wilkinson, M. I., Evans, N. W., Belokurov, V., Irwin, M. J., Gilmore, G., ...
We investigate a wide range of possible evolutionary histories for the recently discovered Bootes dwarf spheroidal galaxy, a Milky Way satellite. By means of N-body simulations we follow the...
Cioni, M. -R. L., Bekki, K., Clementini, G., Emerson, J. P., Evans, C. J., ...
The Magellanic System represents one of the best places to study the formation and evolution of galaxies. Photometric surveys of various depths, areas and wavelengths have had a significant impact on...
Is our Sun a Singleton? (2007)
Malmberg, D., Davies, M. B., Chambers, J. E., De Angeli, F., Church, R. P., Mackey, D., ...
Most stars are formed in a cluster or association, where the number density of stars can be high. This means that a large fraction of initially-single stars will undergo close encounters with other...
The Tidal Tails of NGC 5466 (2007)
Fellhauer, M., Evans, N. W., Belokurov, V., Wilkinson, M. I., Gilmore, G.
The study of substructure in the stellar halo of the Milky Way has made a lot of progress in recent years, especially with the advent of surveys like the Sloan Digital Sky Survey. Here, we study the...
Stellar kinematics in the remote Leo II dwarf spheroidal galaxy -- Another brick in the wall (2007)
Koch, A., Kleyna, J. T., Wilkinson, M. I., Grebel, E. K., Gilmore, G. F., Evans, N. W., ...
We present the projected velocity dispersion profile for the remote (d=233kpc) Galactic dwarf spheroidal (dSph) galaxy Leo II, based on 171 discrete stellar radial velocities that were obtained from...
The effect of stellar-mass black holes on the structural evolution of massive star clusters (2007)
Mackey, A. D., Wilkinson, M. I., Davies, M. B., Gilmore, G. F.
We present the results of realistic N-body modelling of massive star clusters in the Magellanic Clouds, aimed at investigating a dynamical origin for the radius-age trend observed in these systems....
The Hercules-Aquila Cloud (2007)
Belokurov, V., Evans, N. W., Bell, E. F., Irwin, M. J., Hewett, P. C., Koposov, S., ...
We present evidence for a substantial overdensity of stars in the direction of the constellations of Hercules and Aquila. The Cloud is centered at a Galactic longitude of about 40 degrees and extends...
Discovery of an Unusual Dwarf Galaxy in the Outskirts of the Milky Way (2007)
Irwin, M. J., Belokurov, V., Evans, N. W., Ryan-Weber, E. V., Koposov, S., ...
In this Letter, we announce the discovery of a new dwarf galaxy, Leo T, in the Local Group. It was found as a stellar overdensity in the Sloan Digital Sky Survey Data Release 5 (SDSS DR5). The...
Discovery of an unusual dwarf galaxy in the outskirts of the Milky Way (2007)
Irwin, M. J., Belokurov, V., Evans, N. W., Ryan-Weber, E. V., Koposov, S., ...
We announce the discovery of a new dwarf galaxy, Leo T, in the Local Group. It was found as a stellar overdensity in the Sloan Digital Sky Survey Data Release 5 (SDSS DR5). The color-magnitude...
Cats and dogs, hair and a hero: a quintet of New Milky Way companions (2007)
Belokurov, V., Zucker, D. B., Evans, N. W., Kleyna, J. T., Koposov, S., Hodgkin, S. T., ...
We present five new satellites of the Milky Way discovered in Sloan Digital Sky Survey (SDSS) imaging data, four of which were followed up with either the Subaru or the Isaac Newton Telescopes. They...
An Orphan in the ``Field of Streams'' (2007)
Belokurov, V., Evans, N. W., Irwin, M. J., Lynden-Bell, D., Yanny, B., Vidrih, S., ...
We use Sloan Digital Sky Survey Data Release 5 photometry and spectroscopy to study a tidal stream that extends over ~50° in the north Galactic cap. From the analysis of the path of the stream and...
The Hercules-Aquila cloud (2007)
Belokurov, V., Evans, N. W., Bell, E. F., Irwin, M. J., Hewett, P. C., Koposov, S., ...
We present evidence for a substantial overdensity of stars in the direction of the constellations of Hercules and Aquila. The cloud is centered at a Galactic longitude of l~40deg and extends above...
Koch, A., Wilkinson, M. I., Kleyna, J. T., Gilmore, G. F., Grebel, E. K., Mackey, A. D., ...
We present low-resolution spectroscopy of 120 red giants in the Galactic satellite dwarf spheroidal (dSph) Leo I, obtained with the GeminiN-GMOS and Keck-DEIMOS spectrographs. We find stars with...
Is Ursa Major II the Progenitor of the Orphan Stream? (2006)
Fellhauer, M., Evans, N. W., Belokurov, V., Zucker, D. B., Yanny, B., Wilkinson, M. I., ...
Prominent in the `Field of Streams' -- the Sloan Digital Sky Survey map of substructure in the Galactic halo -- is an `Orphan Stream' without obvious progenitor. In this numerical study, we show a...
Complexity on Small Scales II: Metallicities and Ages in the Leo II Dwarf Spheroidal Galaxy (2006)
Koch, A., Grebel, E. K., Kleyna, J. T., Wilkinson, M. I., Harbeck, D. R., Gilmore, G. F., ...
We present metallicities and ages for 52 red giants in the remote Galactic dwarf spheroidal (dSph) galaxy Leo II. These stars cover the entire surface area of Leo II and are radial velocity members....
Cats and Dogs, Hair and A Hero: A Quintet of New Milky Way Companions (2006)
Belokurov, V., Zucker, D. B., Evans, N. W., Kleyna, J. T., Koposov, S., Hodgkin, S. T., ...
We present five new satellites of the Milky Way discovered in Sloan Digital Sky Survey (SDSS) imaging data, four of which were followed-up with either the Subaru or the Isaac Newton Telescopes. They...
A Curious New Milky Way Satellite in Ursa Major (2006)
Zucker, D. B., Belokurov, V., Evans, N. W., Kleyna, J. T., Irwin, M. J., Wilkinson, M. I., ...
In this Letter, we study a localized stellar overdensity in the constellation of Ursa Major, first identified in Sloan Digital Sky Survey (SDSS) data and subsequently followed up with Subaru imaging....
An Orphan in the "Field of Streams" (2006)
Belokurov, V., Evans, N. W., Irwin, M. J., Lynden-Bell, D., Yanny, B., Vidrih, S., ...
We use Sloan Digital Sky Survey Data Release 5 photometry and spectroscopy to study a tidal stream that extends over 50 degrees in the North Galactic Cap. From the analysis of the path of the stream...
The Field of Streams: Sagittarius and its Siblings (2006)
Belokurov, V., Zucker, D. B., Evans, N. W., Gilmore, G., Vidrih, S., Bramich, D. M., ...
We use Sloan Digital Sky Survey (SDSS) Data Release 5 (DR5) u,g,r,i,z photometry to study Milky Way halo substructure in the area around the North Galactic Cap. A simple color cut (g-r < 0.4) reveals...
The Origin of the Bifurcation in the Sagittarius Stream (2006)
Fellhauer, M., Belokurov, V., Evans, N. W., Wilkinson, M. I., Zucker, D. B., Gilmore, G., ...
The latest Sloan Digital Sky Survey data reveal a prominent bifurcation in the distribution of debris of the Sagittarius dwarf spheroidal (Sgr) beginning at a right ascension of roughly 190 degrees....
A New Milky Way Dwarf Satellite in Canes Venatici (2006)
Zucker, D. B., Belokurov, V., Evans, N. W., Wilkinson, M. I., Irwin, M. J., Sivarani, T., ...
In this Letter, we announce the discovery of a new dwarf satellite of the Milky Way, located in the constellation Canes Venatici. It was found as a stellar overdensity in the North Galactic Cap using...
A Faint New Milky Way Satellite in Bootes (2006)
Belokurov, V., Zucker, D. B., Evans, N. W., Wilkinson, M. I., Irwin, M. J., Hodgkin, S., ...
In this Letter, we announce the discovery of a new satellite of the Milky Way in the constellation of Bootes at a distance of 60 kpc. It was found in a systematic search for stellar overdensities in...
Planetary Nebula Velocities in the Disk and Bulge of M31 (2006)
Halliday, C., Carter, D., Bridges, T. J., Jackson, Z. C., Wilkinson, M. I., Quinn, D. P., ...
We present radial velocities for a sample of 723 planetary nebulae (PNe) in the disk and bulge of M31, measured using the WYFFOS fibre spectrograph on the William Herschel telescope. Velocities are...
Merrett, H. R., Merrifield, M. R., Douglas, N. G., Kuijken, K., Romanowsky, A. J., Napolitano, N. R., ...
We present a catalogue of positions, magnitudes and velocities for 3300 emission-line objects found by the Planetary Nebula Spectrograph in a survey of the Andromeda Galaxy, M31. Of these objects,...
The internal kinematics of dwarf spheroidal galaxies (2006)
Wilkinson, M. I., Kleyna, J. T., Evans, N. W., Gilmore, G. F., Read, J. I., Koch, A., ...
The status of kinematic observations in Local Group dwarf spheroidal galaxies (dSphs) is reviewed. Various approaches to the dynamical modelling of these data are discussed and some general features...
Wyse, Rosemary F. G., Gilmore, Gerard, Norris, John E., Wilkinson, M. I., Kleyna, Jan T., Koch, A., ...
The history of the Milky Way Galaxy is written in the properties of its stellar populations. Here we analyse stars observed as part of surveys of local dwarf spheroidal galaxies, but which from their...
A new Milky Way dwarf satellite in Canes Venatici (2006)
Zucker, D. B., Belokurov, V., Evans, N. W., Wilkinson, M. I., Irwin, M. J., Sivarani, T., ...
In this Letter, we announce the discovery of a new dwarf satellite of the Milky Way, located in the constellation Canes Venatici. It was found as a stellar overdensity in the north Galactic cap using...
A curious Milky Way satellite in Ursa Major (2006)
Zucker, D. B., Belokurov, V., Evans, N. W., Kleyna, J. T., Irwin, M. J., Wilkinson, M. I., ...
In this Letter, we study a localized stellar overdensity in the constellation of Ursa Major, first identified in Sloan Digital Sky Survey (SDSS) data and subsequently followed up with Subaru imaging....
A faint new Milky Way satellite in Bootes (2006)
Belokurov, V., Zucker, D. B., Evans, N. W., Wilkinson, M. I., Irwin, M. J., Hodgkin, S., ...
We announce the discovery of a new satellite of the Milky Way in the constellation of Bootes at a distance of ~60 kpc. It was found in a systematic search for stellar overdensities in the north...
The field of streams: Sagittarius and its siblings (2006)
Belokurov, V., Zucker, D. B., Evans, N. W., Gilmore, G., Vidrih, S., Bramich, D. M., ...
We use Sloan Digital Sky Survey (SDSS) Data Release 5 (DR5) u, g, r, i, z photometry to study Milky Way halo substructure in the area around the north Galactic cap. A simple color cut (g-r
The importance of tides for the Local Group dwarf spheroidals (2005)
Read, J. I., Wilkinson, M. I., Evans, N. Wyn, Gilmore, G., Kleyna, Jan T.
There are two main tidal effects which can act on the Local Group dwarf spheroidals (dSphs): tidal stripping and tidal shocking. Using N-body simulations, we show that tidal stripping always leads to...
The Discovery of Tidal Tails Around NGC 5466 (2005)
Belokurov, V., Evans, N. W., Irwin, M. J., Hewett, P. C., Wilkinson, M. I.
We report the discovery of tidal tails around the high-latitude Galactic globular cluster NGC 5466 in Sloan Digital Sky Survey (SDSS) data. Neural networks are used to reconstruct the probability...
Koch, A., Grebel, E. K., Wyse, R. F. G., Kleyna, J. T., Wilkinson, M. I., Harbeck, D., ...
The Carina dwarf spheroidal (dSph) galaxy is the only galaxy of this type that shows clearly episodic star formation separated by long pauses. Here we present metallicities for 437 radial velocity...
Ursa Major: a missing low-mass CDM halo? (2005)
Kleyna, J. T., Wilkinson, M. I., Evans, N. W., Gilmore, G.
The recently discovered Ursa Major dwarf spheroidal (dSph) galaxy candidate is about five to eight times less luminous than the faintest previously known dSphs And IX, Draco, and UMi. In this Letter,...
The tidal stripping of satellites (2005)
Read, J. I., Wilkinson, M. I., Evans, N. W., Gilmore, G., Kleyna, Jan T.
We present an improved analytic calculation for the tidal radius of satellites and test our results against N-body simulations. The tidal radius in general depends upon four factors: the potential of...
Clewley, L., Warren, S. J., Hewett, P. C., Norris, John. E., Wilkinson, M. I., Evans, N. W.
We present VLT-FORS1 spectra of a sample of 34 faint 20.0 < g* < 21.1 A-type stars selected from the Sloan Digital Sky Survey Early Data Release, with the goal of measuring the velocity dispersion of...
Wilkinson, M. I., Vallenari, A., Turon, C., Munari, U., Katz, D., Bono, G., ...
The Gaia mission is designed as a Galaxy explorer, and will measure simultaneously, in a survey mode, the five or six phase space parameters of all stars brighter than 20th magnitude, as well as...
The mass of dwarf spheroidal galaxies and the missing satellite problem (2005)
Read, J. I., Wilkinson, M. I., Evans, N. Wyn, Gilmore, G., Kleyna, Jan T.
We present the results from a suite of N-body simulations of the tidal stripping of two-component dwarf galaxies comprising some stars and dark matter. We show that recent kinematic data from the...
De Grijs, R., Wilkinson, M. I., Tadhunter, C. N.
We present a new analysis of the properties of the young massive star clusters, which demonstrates that these objects are plausible progenitors of old globular clusters (GCs). The method is based on...
Chemical Evolution in the Carina Dwarf Spheroidal (2004)
Koch, A., Grebel, E. K., Harbeck, D., Wilkinson, M. I., Kleyna, J. T., Gilmore, G. F., ...
We present metallicities for 487 red giants in the Carina dwarf spheroidal (dSph) galaxy that were obtained from FLAMES low-resolution Ca triplet (CaT) spectroscopy. We find a mean [Fe/H] of -1.91...
A photometrically and kinematically distinct core in the Sextans dwarf spheroidal galaxy (2004)
Kleyna, J. T., Wilkinson, M. I., Evans, N. W., Gilmore, G. F.
We present the line of sight radial velocity dispersion profile of the Sextans dwarf spheroidal galaxy (dSph), based on a sample of 88 stars extending to about 1 degree (about 1.5 kpc). Like the...
Kinematically Cold Populations at Large Radii in the Draco and Ursa Minor Dwarf Spheroidals (2004)
Wilkinson, M. I., Kleyna, J. T., Evans, N. W., Gilmore, G. F., Irwin, M. J., Grebel, E. K.
We present projected velocity dispersion profiles for the Draco and Ursa Minor (UMi) dwarf spheroidal galaxies based on 207 and 162 discrete stellar velocities, respectively. Both profiles show a...
Tracing the Star Stream Through M31 Using Planetary Nebula Kinematics (2003)
Merrett, H. R., Kuijken, K., Merrifield, M. R., Romanowsky, A. J., Douglas, N. G., Napolitano, N. R., ...
We present a possible orbit for the Southern Stream of stars in M31, which connects it to the Northern Spur. Support for this model comes from the dynamics of planetary nebulae (PNe) in the disk of...
New Mass Estimators for Tracer Populations (2002)
Evans, N. W., Wilkinson, M. I., Perrett, K. M., Bridges, T.
We introduce the tracer mass estimator. This is a new and simple way to estimate the enclosed mass from the projected positions and line of sight velocities of a tracer population (such as globular...
De Grijs, R., Gilmore, G. F., Mackey, A. D., Wilkinson, M. I., Beaulieu, S. F., Johnson, R. A., ...
The distribution of core radii of rich clusters in the Large Magellanic Cloud (LMC) systematically increases in both upper limit and spread with increasing cluster age. Cluster-to-cluster variations...
Dark Matter in Dwarf Spheroidals II: Observations and Modelling of Draco (2001)
Kleyna, J. T., Wilkinson, M. I., Evans, N. W., Gilmore, G.
We present stellar radial velocity data for the Draco dwarf spheroidal galaxy obtained using the AF2/WYFFOS instrument combination on the William Herschel Telescope. Our dataset consists of 186...
Dark Matter in Dwarf Spheroidals I: Models (2001)
Wilkinson, M. I., Kleyna, J., Evans, N. W., Gilmore, G.
This paper introduces a new two-parameter family of dwarf spheroidal (dSph) galaxy models. The density distribution has a Plummer profile and falls like the inverse fourth power of distance in...
Dynamical Mass Estimates for the Halo of M31 from Keck Spectroscopy (2000)
Evans, N. W., Wilkinson, M. I., Guhathakurta, P., Grebel, E. K., Vogt, S. S.
The last few months have seen the measurements of the radial velocities of all of the dwarf spheroidal companions to the Andromeda galaxy (M31) using the spectrographs (HIRES and LRIS) on the Keck...
The Mass of the Andromeda Galaxy (2000)
Evans, N. W., Wilkinson, M. I.
This paper argues that the Milky Way galaxy is probably the largest member of the Local Group. The evidence comes from estimates of the total mass of the Andromeda galaxy (M31) derived from the three...
The Present and Future Mass of the Milky Way Halo (1999)
Wilkinson, M. I., Evans, N. W.
A simple model for the Milky Way halo is presented. It has a flat rotation curve in the inner regions, but the density falls off sharply beyond an outer edge. This truncated, flat rotation curve (TF)...