Results 41 to 50 of about 10,527 (159)

Dynamical Mass Estimates for the Halo of M31 from Keck Spectroscopy [PDF]

, 2000
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 Telescope.
Eva K. Grebel, Grebel E. K., Karachentsev I. D., Mark I. Wilkinson, N. Wyn Evans, Puragra Guhathakurta, Steven S. Vogt, Tikhonov N. A.   +7 more
core   +2 more sources

A New Giant Stellar Structure in the Outer Halo of M31

, 2004
The Sloan Digital Sky Survey has revealed an overdensity of luminous red giant stars ~ 3 degrees (40 projected kpc) to the northeast of M31, which we have called Andromeda NE.
Bell, Eric F., Brewington, Howard, Brinkmann, J., Grebel, Eva K., Harvanek, Michael, Holtzman, Jon A., Ivezic, Zeljko, Kleinman, S. J., Kniazev, Alexei Y., Krzesinski, Jurek, Lamb, Don Q., Long, Dan, Martinez-Delgado, David, Newman, Peter R., Nitta, Atsuko, Rix, Hans-Walter, Rockosi, Constance M., Snedden, Stephanie A., Walterbos, Rene A. M., Zucker, Daniel B.   +19 more
core   +2 more sources

Eclipsing binaries suitable for distance determination in the Andromeda galaxy [PDF]

, 2006
The Local Group galaxies constitute a fundamental step in the definition of cosmic distance scale. Therefore, obtaining accurate distance determinations to the galaxies in the Local Group, and notably to the Andromeda Galaxy (M31), is essential to ...
Alard, Alves, Baade, Bonanos, Brewer, Brown, C. Jordi, Capaccioli, Clementini, Durrell, F. Vilardell, Fitzpatrick, Freedman, Freedman, Holland, I. Ribas, Joshi, Kaluzny, Landolt, Massey, McConnachie, Mochejska, Mould, Ostriker, Pritchet, Ribas, Ribas, Ribas, Richer, Saha, Schwarzenberg-Czerny, Stanek, Stanek, Stanek, Stetson, Todd, Welch, Wilson, Wozniak, Zebrun   +39 more
core   +2 more sources

Galaxy Disruption in a Halo of Dark Matter

, 2003
The relics of disrupted satellite galaxies around the Milky Way and Andromeda have been found, but direct evidence of a satellite galaxy in the early stages of being disrupted has remained elusive.
Beasley, Michael, Bekki, Kenji, Brodie, Jean, Forbes, Duncan, Strader, Jay   +4 more
core   +1 more source

The Andromeda Dwarf Spheroidal Galaxies [PDF]

Symposium - International Astronomical Union, 1999
Our current knowledge of M31's dwarf spheroidal companions is reviewed. Two topics of recent interest constitute the bulk of this review. First, color-magnitude diagrams reaching below the horizontal branch have been constructed for two M31 dwarf spheroidals, based on images from HST/WFPC2. The horizontal branches are predominantly red in both galaxies,
Armandroff, Taft E., Da Costa, Gary S.
openaire   +2 more sources

The Collision Between The Milky Way And Andromeda

, 2008
We use a N--body/hydrodynamic simulation to forecast the future encounter between the Milky Way and the Andromeda galaxies, given current observational constraints on their relative distance, relative velocity, and masses.
Abraham Loeb, Adams, Barnes, Barnes, Barnes, Besla, Binney, Brunthaler, Busha, Busha, Cen, Cox, Cox, Davé, Desroches, Dubinski, Dubinski, Eisenhauer, Fich, Forbes, Gao, Gott, Górski, Hellsten, Hernquist, Hernquist, Hernquist, Hopkins, Kahn, Kasting, Katz, Kennicutt, Klypin, Kormendy, Korycansky, Li, Loeb, Loeb, McConnachie, McConnachie, Mihos, Mihos, Mo, Naab, Nagamine, Nagamine, Navarro, Navarro, Nicastro, Nicastro, Osone, Pahre, Peebles, Peebles, Peebles, Raychaudhury, Ribas, Rothberg, Sackmann, Sanders, Savage, Sawa, Seigar, Sembach, Shen, Spergel, Springel, Springel, Springel, Springel, Springel, Springel, Stinson, T. J. Cox, Tegmark, Toomre, Udry, Valtonen, van der Marel, Widrow, Willman, Wyse   +81 more
core   +1 more source

The PAndAS view of the Andromeda satellite system - I. A Bayesian search for dwarf galaxies using spatial and color-magnitude information [PDF]

, 2013
We present a generic algorithm to search for dwarf galaxies in photometric catalogs and apply it to the Pan-Andromeda Archaeological Survey (PAndAS).
Fardal, Mark A., Ferguson, Annette M. N., Ibata, Rodrigo A., Irwin, Michael J., Lewis, Geraint F., Mackey, A. Dougal, Martin, Nicolas F., McConnachie, Alan W.   +7 more
core   +1 more source

Skepticism and Ontological Parsimony

Pacific Philosophical Quarterly, EarlyView.
ABSTRACT External world skepticism is often thought to entail that we should suspend judgment about the existence of the external world. I challenge this orthodoxy by arguing that, when combined with a plausible principle of ontological parsimony, the skeptical challenge intensifies into an argument for outright disbelief in the external world.
James H. McIntyre
wiley   +1 more source

Lessons from the Local Group (and beyond) on dark matter

, 2014
(Abridged) The existence of exotic dark matter particles outside the standard model of particle physics constitutes a central hypothesis of the current standard model of cosmology (SMoC).
Kroupa, Pavel
core   +1 more source

A comprehensive study of Cepheid variables in the Andromeda galaxy. Period distribution, blending and distance determination [PDF]

, 2007
Extragalactic Cepheids are the basic rungs of the cosmic distance scale. They are excellent standard candles, although their luminosities and corresponding distance estimates can be affected by the particular properties of the host galaxy. Therefore, the
Alcock, Antonello, Antonello, Antonello, Baade, Baade, Barnes, Beaulieu, Becker, Benedict, Bresolin, C. Jordi, Cotton, F. Vilardell, Feast, Fernie, Fitzpatrick, Fitzpatrick, Fliri, Freedman, Gibson, Hubble, I. Ribas, Kennicutt, Kennicutt, Landolt, Leavitt, Macri, Mochejska, Mochejska, Ngeow, Petersen, Pietrzynski, Ribas, Saha, Sandage, Schwarzenberg-Czerny, Simien, Udalski, Udalski, van Leeuwen, Vilardell, Wozniak, Zakrzewski   +43 more
core   +1 more source