Results 51 to 60 of about 11,151 (256)

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

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

Resolved SPLASH Chemodynamics in Andromeda’s PHAT Stellar Halo and Disk: On the Nature of the Inner Halo along the Major Axis

The Astronomical Journal, 2023
Stellar kinematics and metallicity are key to exploring formation scenarios for galactic disks and halos. In this work, we characterized the relationship between kinematics and photometric metallicity along the line of sight to M31's disk.
Ivanna Escala, Amanda C. N. Quirk, Puragra Guhathakurta, Karoline M. Gilbert, J. Leigh Wojno, Lara Cullinane, Benjamin F. Williams, Julianne Dalcanton   +7 more
doaj   +1 more source

The satellite distribution of M31

, 2005
(Abridged) The spatial distribution of the Galactic satellite system plays an important role in Galactic dynamics and cosmology, where its successful reproduction is a key test of simulations of galaxy halo formation.
Irwin, Mike, McConnachie, Alan
core   +2 more sources

On the α/Fe Bimodality of the M31 Disks

The Astrophysical Journal Letters, 2023
An outstanding question is whether the α /Fe bimodality exists in disk galaxies other than in the Milky Way. Here we present a bimodality using our state-of-the-art galactic chemical evolution models that can explain various observations in the Andromeda
Chiaki Kobayashi, Souradeep Bhattacharya, Magda Arnaboldi, Ortwin Gerhard   +3 more
doaj   +1 more source

Disk Heating, Galactoseismology, and the Formation of Stellar Halos [PDF]

, 2017
Deep photometric surveys of the Milky Way have revealed diffuse structures encircling our Galaxy far beyond the "classical" limits of the stellar disk. This paper reviews results from our own and other observational programs, which together suggest that,
Beaton, Rachael S., Bergemann, Maria, Johnston, Kathryn V., Laporte, Chervin, Li, Ting S., Majewski, Steven R., Price-Whelan, Adrian M., Sesar, Branimir, Sharma, Sanjib, Sheffield, Allyson A.   +9 more
core   +5 more sources

Redshift‐Agnostic Machine Learning Classification: Unveiling Peak Performance in Galaxy, Star, and Quasar Classification (Using SDSS DR17)

Astronomische Nachrichten, Volume 346, Issue 5, June 2025.
ABSTRACT Classification of galaxies, stars, and quasars using spectral data is fundamental to astronomy, but often relies heavily on redshift. This study evaluates the performance of 10 machine learning algorithms on SDSS data to classify these objects, with a particular focus on scenarios where redshift information is unavailable.
Debashis Chatterjee, Prithwish Ghosh
wiley   +1 more source

Scientific photography and astronomy: Technology applied to understanding the universe

Mètode Science Studies Journal: Annual Review
In 1925, Edwin Hubble took the first step towards increasing the size of the known universe by several orders of magnitude using the precarious photographic methods available at the time: glass plates and photosensitive emulsions.
Fernando Abalos Vazquez, Javier Ábalos
doaj   +1 more source

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

A Search for Dark Matter Annihilation in Galaxy Groups [PDF]

, 2018
We use 413 weeks of publicly-available $\textit{Fermi}$ Pass 8 gamma-ray data, combined with recently-developed galaxy group catalogs, to search for evidence of dark matter annihilation in extragalactic halos.
Lisanti, Mariangela, Mishra-Sharma, Siddharth, Rodd, Nicholas L., Safdi, Benjamin R.   +3 more
core   +2 more sources