Results 121 to 130 of about 370,839 (289)
Noûs, Volume 58, Issue 1, Page 202-224, March 2024.Abstract We develop a new version of the causal theory of spacetime. Whereas traditional versions of the theory seek to identify spatiotemporal relations with causal relations, the version we develop takes causal relations to be the grounds for spatiotemporal relations. Causation is thus distinct from, and more basic than, spacetime. We argue that this
Sam Baron, Baptiste Le Bihan
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 survey of HI gas toward the Andromeda Galaxy [PDF]
, 2016 The subsequent coalescence of low--mass halos over cosmic time is thought to be the major formation channel of massive spiral galaxies like the Milky Way and the Andromeda Galaxy (M31).
J. Kerp +6 more
semanticscholar +1 more source
Reflecting on Our Present Self‐Awareness of Not Having Found Any Life Beyond Earth
Earth and Space Science, Volume 11, Issue 1, January 2024.Abstract Ever gazed at the stars and wondered if we’re alone? Scientists have been on a quest to find life beyond Earth, but no aliens yet. It’s tough because space is huge, and potential life is incredibly far away, making it difficult to detect their signals. Despite this, our ability to search is improving.
Stuart F. Taylor +3 more
wiley +1 more source
ANDROMEDA XXIX: A NEW DWARF SPHEROIDAL GALAXY 200 kpc FROM ANDROMEDA [PDF]
The Astrophysical Journal, 2011 We report the discovery of a new dwarf galaxy, Andromeda XXIX, using data from the recently-released Sloan Digital Sky Survey DR8, and confirmed by Gemini North telescope Multi-Object Spectrograph imaging data. And XXIX appears to be a dwarf spheroidal galaxy, separated on the sky by a little more than 15 degrees from M31, with a distance inferred from
Bell, Eric F. +2 more
openaire +5 more sources
Variable stars and stellar populations in Andromeda XXV: III. A central cluster or the galaxy nucleus? [PDF]
, 2016 We present B and V time-series photometry of Andromeda XXV, the third galaxy in our program on the Andromeda's satellites, that we have imaged with the Large Binocular Cameras of the Large Binocular Telescope. The field of Andromeda XXV is found to contain 63 variable stars, for which we present light curves and characteristics of the light variation ...
arxiv +1 more source
Constraints on the Proper Motion of the Andromeda Galaxy Based on the Survival of Its Satellite M33 [PDF]
Astrophys.J.633:894-898,2005, 2005 A major uncertainty in the dynamical history of the local group of galaxies originates from the unknown transverse speed of the Andromeda galaxy (M31) relative to the Milky Way. We show that the recent VLBA measurement of the proper motion of Andromeda's satellite, M33, severely constrains the possible values of M31's proper motion.
arxiv +1 more source
Simulated ΛCDM analogues of the thin plane of satellites around the Andromeda galaxy are not kinematically coherent structures [PDF]
, 2015 A large fraction of the dwarf satellites orbiting the Andromeda galaxy are surprisingly aligned in a thin, extended and apparently kinematically coherent planar structure.
T. Buck, A. Dutton, A. Macciò
semanticscholar +1 more source
The ellipticities of globular clusters in the Andromeda galaxy [PDF]
Astronomy and Astrophysics Supplement Series, 1996 The projected ellipticities and orientations of 173 globular clusters in the Andromeda galaxy have been determined by using isodensity contours and 2D Gaussian tting techniques. A number of B plates taken with the 2 m Ritchey-Chretien-coud e reflector of the Bulgarian National Astronomical Observatory were digitized and processed for each cluster.
A. Staneva, N. Spassova, V. Golev
openaire +2 more sources
Dust around Massive Stars Is Agnostic to Galactic Environment: New Insights from PHAT/BEAST
The Astrophysical JournalResolving the environments of massive stars is crucial for understanding their formation mechanisms and their impact on galaxy evolution. An important open question is whether massive stars found in diffuse regions outside spiral arms formed in situ or ...
Christina Willecke Lindberg +4 more
doaj +1 more source