Results 41 to 50 of about 159,199 (212)

The Nature of X-Ray Sources in the Andromeda Galaxy [PDF]

, 2023
Using the Panchromatic Hubble Andromeda Treasury (PHAT) Program and Chandra X-Ray Observatory, we have acquired archival data from ~1/3 of Andromeda Galaxy to study the properties of the X-ray sources.
Nava, Erika Marentes
core   +1 more source

Tree Harvest Decisions Modulate the Climate Impact of Rewetting in a Low‐Productive Peatland Forest in Boreal Sweden

Global Change Biology, Volume 32, Issue 6, June 2026.
Rewetting drained boreal peatland forests is increasingly promoted as a climate mitigation strategy, yet its effects on carbon (C) and greenhouse gas (GHG) balances remain uncertain. This study quantified CO2 and CH4 fluxes over 2 years before and after rewetting in a low‐productive peatland forest, with and without tree harvest.
Järvi Järveoja, Alexander Pinkwart, Cheuk Hei Marcus Tong, Eduardo Martínez‐García, Hjalmar Laudon, Matthias Peichl, Mats B. Nilsson   +6 more
wiley   +1 more source

Ultra high energy cosmic rays from past activity of Andromeda galaxy [PDF]

, 2022
It is shown that the relativistic jets associated with the growth and past activity of the supermassive black hole in the Andromeda galaxy could be the main source of cosmic rays with energies above $10^{15}$ eV.
Rogovaya, S. I., Zirakashvili, V. N., Ptuskin, V. S.   +2 more
core   +1 more source

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

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 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 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

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

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

THEHERSCHELEXPLOITATION OF LOCAL GALAXY ANDROMEDA (HELGA). II. DUST AND GAS IN ANDROMEDA [PDF]

The Astrophysical Journal, 2012
We present an analysis of the dust and gas in Andromeda, using Herschel images sampling the entire far-infrared peak. We fit a modified-blackbody model to ~4000 quasi-independent pixels with spatial resolution of ~140pc and find that a variable dust-emissivity index (beta) is required to fit the data. We find no significant long-wavelength excess above
Smith, M. W. L., Eales, S. A., Gomez, H. L., Roman-Duval, J., Fritz, J., Braun, R., Baes, M., Bendo, G. J., Blommaert, J. A. D. L., Boquien, M., Boselli, A., Clements, D. L., Cooray, A. R., Cortese, L., Looze, I., Ford, G. P., Gear, W. K., Gentile, G., Gordon, K. D., Kirk, J., Lebouteiller, V., Madden, S., Mentuch, E., O'Halloran, B., Page, M. J., Schulz, B., Spinoglio, L., Verstappen, J., Wilson, C. D., Thilker, D. A.   +29 more
openaire   +5 more sources