Results 41 to 50 of about 154,665 (207)

A comparison of the Andromeda and Milky Way galaxies [PDF]

Symposium - International Astronomical Union, 1985
A comparison of some of the basic properties of M31 and the Milky Way indicates that in almost every respect M31 is larger than the Galaxy. It is more luminous, redder, more massive, and of earlier Hubble type. A detailed comparison of the spiral structure, based on optical tracers, for comparable areas in the outer parts of each galaxy shows ...
openaire   +1 more source

Molecular gas in the Andromeda galaxy [PDF]

Astronomy & Astrophysics, 2006
We present a new 12CO(J=1-0)-line survey of the Andromeda galaxy, M31, covering the bright disk with the highest resolution to date (85 pc along the major axis), observed On-the-Fly (in italics) with the IRAM 30-m telescope. We discuss the distribution of the CO emission and compare it with the distributions of HI and emission from cold dust traced at ...
Nieten, Ch., Neininger, N., Guelin, M., Ungerechts, H., Lucas, R., Berkhuijsen, E. M., Beck, R., Wielebinski, R.   +7 more
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Skepticism and Ontological Parsimony

Pacific Philosophical Quarterly, Volume 107, Issue 2, Page 86-98, June 2026.
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

The Isaac Newton Telescope Monitoring Survey of Local Group Dwarf Galaxies. VIII. A Census of Long-period Variable Stars across the Andromeda Dwarf Satellite System

The Astrophysical Journal
We present a comprehensive catalog, in the Sloan i and Harris V filters, of long-period variable (LPV) stars in the spheroidal dwarf satellites of the Andromeda galaxy based on a dedicated survey for variable stars in Local Group dwarf systems.
Hedieh Abdollahi, Atefeh Javadi, Jacco Th. van Loon, Iain McDonald, Mahdi Abdollahi, Elham Saremi, Habib G. Khosroshahi, László Molnár, Hamidreza Mahani   +8 more
doaj   +1 more source

Mass modelling the Andromeda Dwarf Galaxies: Andromeda VI and Andromeda XXIII

Monthly Notices of the Royal Astronomical Society
ABSTRACT Accurately mapping the mass profiles of low mass dwarf spheroidal (dSph) galaxies allows us to test predictions made by dark matter (DM) models. To date, such analyses have primarily been performed on Milky Way (MW) satellites.
Connor S Pickett, Michelle L M Collins, R Michael Rich, Justin I Read, Emily J E Charles, Nicolas Martin, Scott Chapman, Alan McConnachie, Alessandro Savino, Daniel R Weisz   +9 more
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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

Anxiety and Evidence

Philosophical Issues, Volume 35, Issue 1, Page 17-28, October 2025.
ABSTRACT When does an agent possess a proposition P as evidence? According to Timothy Williamson, the answer is when, and only when, they know that P. Call this view E = K. In this article, I point out an unwanted consequence of E = K, which is that people who suffer from anxiety have impoverished empirical evidence due to their anxiety.
Rhys Borchert
wiley   +1 more source

Andromeda galaxy - Messier 31

, 2016
Through this image it is possible to see the Andromeda galaxy. This famous galaxy is located next to the Milky Way, being 2.5 million light-years far from itComponente Curricular::Educação Superior::Ciências Exatas e da Terra ...
National Aeronautics and Space Administration (NASA), Jet Propulsion Laboratory, California Institute of Technology   +2 more
core   +2 more sources

The Samples and Binary Fractions of Red Supergiants in M31 and M33 by the HST Observations

The Astrophysical Journal
The binarity of red supergiants (RSGs) influences their evolution and the fate of supernovae. We investigate the binary fraction of RSGs in the Andromeda galaxy (M31) and Triangulum galaxy (M33) using photometry from the Hubble Space Telescope (HST ...
Min Dai, Shu Wang, Biwei Jiang, Ying Li
doaj   +1 more source

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