Ibata, R., Bellazzini, M., Chapman, S. C., Dalessandro, E., Ferraro, F. R., Irwin, M., ...
We report the detection of a stellar density cusp and a velocity dispersion increase in the center of the globular cluster M54, located at the center of the Sagittarius dwarf galaxy (Sgr). The...
The Discovery of Remote Globular Clusters in M33 (2009)
Huxor, A., Ferguson, A. M. N., Barker, M. K., Tanvir, N. R., Irwin, M. J., Chapman, S. C., ...
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...
A spectroscopic survey of EC4, an Extended Cluster in Andromeda's halo (2009)
Collins, M. L. M., Chapman, S. C., Irwin, M., Ibata, R., Martin, N. F., Ferguson, A. M. N., ...
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,...
Globular Cluster Candidates in NGC 891 (2009)
Harris, W. E., Mouhcine, M., Rejkuba, M., Ibata, R.
We use deep images taken with the Advanced Camera for Surveys on board the Hubble Space Telescope of the disk galaxy NGC 891, to search for globular cluster candidates. This galaxy has long been...
Chapman, S. C., Blain, A., Ibata, R., Ivison, R. J., Smail, I., Morrison, G.
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 arcmin2. It is the...
Chapman, S. C., Blain, A., Ibata, R., Ivison, R. J., Smail, I., Morrison, G.
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 arcmin^2. It is the...
The kinematic footprints of five stellar streams in Andromeda's halo (2008)
Chapman, S. C., Ibata, R., Irwin, M., Koch, A., Letarte, B., Martin, N., ...
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 Stream 'C', all discovered in the halo of M31...
Chapman, S. C., Blain, A. W., Ibata, R., Ivison, R. J., Smail, Ian, Morrison, G.
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...
The kinematic footprints of five stellar streams in Andromeda's halo (2008)
Chapman, S. C., Ibata, R., Irwin, M., Koch, A., Letarte, B., Martin, N., ...
(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...
AGB stars as tracers of metallicity and mean age across M33 (2008)
Cioni, M. -R. L., Irwin, M., Ferguson, A. M. N., McConnachie, A., Conn, B. C., Huxor, A., ...
Wide-field JHKs near-infrared observations covering an area of 1.8x1.8 sq. deg. centred on M33 were obtained using WFCAM at UKIRT. These data show a large population of intermediate-age asymptotic...
AGB stars as tracers of metallicity and mean age across M 33 (2008)
Cioni, M-R.L., Irwin, M., Ferguson, A.M.N., McConnachie, A., Conn, B.C., Huxor, A., ...
Original article can be found at: http://www.aanda.org/ Copyright The European Southern Observatory DOI: 10.1051/0004-6361:200809366
The kinematic footprints of five stellar streams in Andromeda's halo (2008)
Chapman, S. C., Ibata, R., Irwin, M., Koch, A., Letarte, B., Martin, N., ...
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 Stream`C', all discovered in the halo of M31...
Globular clusters in the outer halo of M31: the survey (2007)
Huxor, A. P., Tanvir, N. R., Ferguson, A. M. N., Irwin, M. J., Ibata, R., Bridges, T., ...
We report the discovery of 40 new globular clusters (GCs) that have been found in surveys of the halo of M31 based on INT/WFC and CHFT/Megacam imagery. A subset of these these new GCs are of an...
Metallicity and mean age across M33 (2007)
Cioni, M. -R. L., Irwin, M., Ferguson, A. M. N., McConnachie, A., Conn, B. C., Huxor, A., ...
New wide-field near-infrared (NIR) imaging observations of M33 were obtained from UKIRT. These show a large population of intermediate-age stars considerably improving on previous NIR data. The...
Chapman, S. C., Penarrubia, J., Ibata, R., McConnachie, A., Martin, N., Irwin, M., ...
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...
The Haunted Halos of Andromeda and Triangulum: A panorama of galaxy formation in action (2007)
Ibata, R., Martin, N. F., Irwin, M., Chapman, S., Ferguson, A. M. N., Lewis, G. F., ...
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...
The haunted halos of Andromeda and Triangulum: a panorama of galaxy formation in action (2007)
Ibata, R., Martin, N. F., Irwin, M., Chapman, S., Ferguson, A. M. N., Lewis, G. F., ...
We present a deep photometric survey of the Andromeda galaxy, conducted with the wide-field cameras of CFHT and INT, that covers the inner 50 kpc of the galaxy and the southern quadrant out to ~150...
Chapman, S. C., Peñarrubia, J., Ibata, R., McConnachie, A., Martin, N., Irwin, M., ...
We present spectroscopic observations of the And XII dwarf spheroidal galaxy using DEIMOS/Keck II, showing it to be moving rapidly through the Local Group (-556 km s-1 heliocentric velocity, -281 km...
ACS photometry of newly-discovered globular clusters in the outer halo of M31 (2006)
Mackey, A. D., Huxor, A., Ferguson, A. M. N., Tanvir, N. R., Irwin, M., Ibata, R., ...
We report the first results from deep ACS imaging of ten classical globular clusters in the far outer regions (15 < R_p < 100 kpc) of M31. Eight of the clusters, including two of the most remote M31...
Ibata, R., Chapman, S., Irwin, M., Lewis, G., Martin, N.
We present a spectroscopic survey of the newly discovered Canes Venatici dwarf galaxy using the Keck/DEIMOS spectrograph. Two stellar populations of distinct kinematics are found to be present in...
ACS photometry of extended, luminous globular clusters in the outskirts of M31 (2006)
Mackey, A. D., Huxor, A., Ferguson, A. M. N., Tanvir, N. R., Irwin, M., Ibata, R., ...
A new population of extended, luminous globular clusters has recently been discovered in the outskirts of M31. These objects have luminosities typical of classical globular clusters, but much larger...
A kinematically selected, metal-poor stellar halo in the outskirts of M31 (2006)
Chapman, S. C., Ibata, R., Lewis, G. F., Ferguson, A. M. N., Irwin, M., McConnachie, A., ...
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....
Spectroscopic classification of red high proper motion objects in the Southern Sky (2005)
Lodieu, N., McCaughrean, M. J., Ibata, R., Irwin, M., Zinnecker, H.
We present the results of spectroscopic follow-up observations for a sample of 71 red objects with high proper motions in the range 0.08-1.14 arcsec/yr as detected using APM and SSS measurements of...
The core of the Canis Major galaxy as traced by Red Clump stars (2005)
Bellazzini, M., Ibata, R., Martin, N., Lewis, G. F., Conn, B., Irwin, M. J.
The recently-discovered stellar system in Canis Major is analysed using He-burning Red Clump stars as tracers. Canis Major turns out to be the strongest and most spatially confined overdensity of the...
On the accretion origin of a vast extended stellar disk around the Andromeda galaxy (2005)
Ibata, R., Chapman, S., Ferguson, A. M. N., Lewis, G., Irwin, M., Tanvir, N.
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...
A new population of extended, luminous star clusters in the halo of M31 (2005)
Huxor, A.P., Tanvir, Nial R., Irwin, M.J., Ibata, R., Collett, J.L., Ferguson, A.M.N., ...
A new population of extended, luminous star clusters in the halo of M31 (2004)
Huxor, A. P., Tanvir, N. R., Irwin, M. J., Ibata, R., Collett, J. L., Ferguson, A. M. N., ...
We present three new clusters discovered in the halo of M31 which, although having globular-like colours and luminosities,have an unusually large half-light radii, ~30 pc. They lie at projected...
The tidal trail of NGC205? (2004)
McConnachie, A., Irwin, M., Lewis, G., Ibata, R., Chapman, S., Ferguson, A., ...
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...
Ibata, R., Chapman, S., Ferguson, A. M. N., Irwin, M., Lewis, G., McConnachie, A.
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...
Survey for the companions of SN 1572 and SN 1006 (2004)
Ruiz-Lapuente, P., Comeron, F., Méndez, J., Canal, R., Filippenko, A. V., Kurucz, R. L., ...
Newly discovered globular clusters in the outer halo of M31 (2004)
Huxor, A., Tanvir, N. R., Irwin, M., Ferguson, A., Ibata, R., Lewis, G., ...
Bellazzini, M., Ibata, R., Monaco, L., Martin, N., Irwin, M. J., Lewis, G. F.
We report on the detection of Main Sequence stars belonging to the recently identified Canis Major galaxy in a field located at ~ 4.2 deg from the center of the stellar system. With Main Sequence...
An active M8.5 dwarf wide companion to the M4/DA binary LHS4039/LHS4040 (2003)
Lodieu, N., Ibata, R., Bienaymé, O., Irwin, M., McCaughrean, M. J., ...
Low-mass and brown dwarfs have recently been found as wide companions to many nearby stars, formerly believed to be single. Wide binaries are usually found as common proper motion pairs. Sometimes,...
Globular Clusters in the Sgr Stream and other structures (2003)
Bellazzini, M., Ibata, R., Ferraro, F. R
The possible association of Galactic globular clusters with the Sgr Stream is shortly reviewed at the light of the most recent observations of the Stream. >= 20 % of the Galactic globular clusters...
A new wide pair of cool white dwarfs in the Solar neighbourhood (2001)
Szokoly, G. P., Andersen, M., Ibata, R., Irwin, M.
We report the discovery of a wide pair (93 arcsec angular separation) of extremely cool ($T_{eff}
Odenkirchen, M., Grebel, E. K., Rockosi, C. M., Dehnen, W., Ibata, R., ...
We report the discovery of two well-defined tidal tails emerging from the sparse remote globular cluster Palomar 5. These tails stretch out symmetrically to both sides of the cluster in the direction...
Re-examination of the possible tidal stream in front of the LMC (1998)
It has recently been suggested that the stars in a vertical extension of the red clump feature seen in LMC color-magnitude diagrams could belong to a tidal stream of material located in front of that...