Zobrazeno 41 - 50
of 198
pro vyhledávání: '"Collins, Michelle L"'
Autor:
Martin, Nicolas F., Geha, Marla, Ibata, Rodrigo A., Collins, Michelle L. M., Laevens, Benjamin P. M., Bell, Eric F., Rix, Hans-Walter, Ferguson, Annette M. N., Chambers, Kenneth C., Wainscoat, Richard J., Waters, Christopher
We present the first spectroscopic analysis of the faint and compact stellar system Draco II (Dra II, M_V=-2.9+/-0.8, r_h=19^{+8}_{-6} pc), recently discovered in the Pan-STARRS1 3{\pi} survey. The observations, conducted with DEIMOS on the Keck II t
Externí odkaz:
http://arxiv.org/abs/1510.01326
Autor:
Collins, Michelle L. M., Martin, Nicolas F., Rich, R. M., Ibata, Rodrigo A., Chapman, Scott C., McConnachie, Alan W., Ferguson, Annette M., Irwin, Michael J., Lewis, Geraint F.
The thin, extended planes of satellite galaxies detected around both the Milky Way and Andromeda are not a natural prediction of the LCDM paradigm. Galaxies in these distinct planes may have formed and evolved in a different way (e.g., tidally) to th
Externí odkaz:
http://arxiv.org/abs/1411.3324
Autor:
Martin, Nicolas F., Chambers, Kenneth C., Collins, Michelle L. M., Ibata, Rodrigo A., Rich, R. Michael, Bell, Eric F., Bernard, Edouard J., Ferguson, Annette M. N., Flewelling, Heather, Kaiser, Nicholas, Magnier, Eugene A., Tonry, John L., Wainscoat, Richard J.
We present Keck II/DEIMOS spectroscopy of the three distant dwarf galaxies of M31 Lacerta I, Cassiopeia III, and Perseus I, recently discovered within the Pan-STARRS1 3\pi imaging survey. The systemic velocities of the three systems (v_{r,helio} = -1
Externí odkaz:
http://arxiv.org/abs/1408.5130
Autor:
Martin, Nicolas F., Ibata, Rodrigo A., Rich, R. Michael, Collins, Michelle L. M., Fardal, Mark A., Irwin, Michael J., Lewis, Geraint F., McConnachie, Alan W., Babul, Arif, Bate, Nicholas F., Chapman, Scott C., Conn, Anthony R., Crnojević, Denija, Ferguson, Annette M. N., Mackey, A. Dougal, Navarro, Julio F., Peñarrubia, Jorge, Tanvir, Nial T., Valls-Gabaud, David
We reveal the highly structured nature of the Milky Way stellar halo within the footprint of the PAndAS photometric survey from blue main sequence and main sequence turn-off stars. We map no fewer than five stellar structures within a heliocentric ra
Externí odkaz:
http://arxiv.org/abs/1403.4945
Akademický článek
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Autor:
Collins, Michelle L. M., Chapman, Scott C., Rich, R. M., Ibata, Rodrigo A., Martin, Nicolas F., Irwin, Michael J., Bate, Nicholas F., Lewis, Geraint F., Peñarrubia, Jorge, Arimoto, Nobuo, Casey, Caitlin M., Ferguson, Annette M. N., Koch, Andreas, McConnachie, Alan W., Tanvir, Nial
We investigate the claim that all dwarf spheroidal galaxies (dSphs) reside within halos that share a common, universal mass profile as has been derived for dSphs of the Galaxy. By folding in kinematic information for 25 Andromeda dSphs, more than dou
Externí odkaz:
http://arxiv.org/abs/1309.3053
Autor:
Collins, Michelle L. M., Chapman, Scott C., Rich, R. Michael, Ibata, Rodrigo A., Martin, Nicolas F., Irwin, Michael J., Bate, Nicholas F., Lewis, Geraint F., Peñarrubia, Jorge, Arimoto, Nobuo, Casey, Caitlin M., Ferguson, Annette M. N., Koch, Andreas, McConnachie, Alan W., Tanvir, Nial
We present a homogeneous kinematic analysis of red giant branch stars within 18 of the 28 Andromeda dwarf spheroidal (dSph) galaxies, obtained using the Keck I LRIS and Keck II DEIMOS spectrographs. Based on their g-i colors (taken with the CFHT Mega
Externí odkaz:
http://arxiv.org/abs/1302.6590
Autor:
Ibata, Rodrigo A., Lewis, Geraint F., Conn, Anthony R., Irwin, Michael J., McConnachie, Alan W., Chapman, Scott C., Collins, Michelle L., Fardal, Mark, Ferguson, Annette M. N., Ibata, Neil G., Mackey, A. Dougal, Martin, Nicolas F., Navarro, Julio, Rich, R. Michael, Valls-Gabaud, David, Widrow, Lawrence M.
Publikováno v:
Nature 493, 62-65 (2013)
Dwarf satellite galaxies are thought to be the remnants of the population of primordial structures that coalesced to form giant galaxies like the Milky Way. An early analysis noted that dwarf galaxies may not be isotropically distributed around our G
Externí odkaz:
http://arxiv.org/abs/1301.0446
Autor:
Koch, Andreas, Burkert, Andreas, Rich, R. Michael, Collins, Michelle L. M., Black, Christine S., Hilker, Michael, Benson, Andrew J.
We report on the discovery of strong tidal features around a dwarf spheroidal galaxy in the Hydra I galaxy cluster, indicating its ongoing tidal disruption. This very low surface brightness object, HCC-087, was originally classified as an early-type
Externí odkaz:
http://arxiv.org/abs/1207.2762
Using spectroscopic data taken with Keck II DEIMOS by the Z-PAndAS team in the Andromeda-Triangulum region, I present a comparison of the disc and satellite systems of Andromeda with those of our own Galaxy. I discuss the observed discrepancies betwe
Externí odkaz:
http://arxiv.org/abs/1201.1989