Results 41 to 50 of about 9,651 (186)

THE NATURE OF RED DWARF GALAXIES [PDF]

The Astrophysical Journal, 2009
9 pages, 8 figures, Accepted for publication in ...
Wang, Y, Yang, XH, Mo, HJ, van den Bosch, FC, Katz, N, Pasquali, A, McIntosh, DH, Weinmann, SM   +7 more
openaire   +4 more sources

Visionaries and Crackpots, Maniacs and Saints: Existential Risk and the Politics of Longtermism

Ratio, Volume 38, Issue 4, Page 268-278, December 2025.
ABSTRACT Despite advancing strong claims about our collective priorities, longtermism has received little attention in debates in political philosophy. I first provide an account of longtermism that highlights the way it departs from established work on intergenerational justice.
Alex McLaughlin
wiley   +1 more source

MaNGA AGN dwarf galaxies (MAD)

Astronomy & Astrophysics
Context. Feedback from an active galactic nucleus (AGN) is one of the most important mechanisms in galaxy evolution. This phenomenon is usually found in massive galaxies and is known to regulate star formation. Although dwarf galaxies are assumed to be regulated by supernova feedback, recent studies have offered evidence to support the presence of AGN ...
V. Rodríguez Morales, M. Mezcua, H. Domínguez Sánchez, A. Audibert, F. Müller-Sánchez, M. Siudek, A. Eróstegui   +6 more
openaire   +3 more sources

DWARF GALAXIES AND THE COSMIC WEB [PDF]

The Astrophysical Journal, 2013
We use a cosmological simulation of the formation of the Local Group of Galaxies to identify a mechanism that enables the removal of baryons from low-mass halos without appealing to feedback or reionization. As the Local Group forms, matter bound to it develops a network of filaments and pancakes.
Alejandro Benitez-Llambay, Julio F. Navarro, Mario G. Abadi, Stefan Gottl??ber, Gustavo Yepes, Yehuda Hoffman, Matthias Steinmetz   +6 more
openaire   +5 more sources

New Arabic Records From Cairo on Supernovae 1181 and 1006

Astronomische Nachrichten, Volume 346, Issue 9, November 2025.
ABSTRACT The remnant of the historical supernova SN 1181 is under discussion: While the previously suggested G130.7+3.1 (3C58) appears too old (3000–5000 year), the unusual star IRAS00500+6713 with a surrounding nebula (Pa‐30) has an expansion age not inconsistent with a SN Iax explosion in ad 1181 under the assumption that neither acceleration nor ...
J. G. Fischer, H. Halm, R. Neuhäuser, D. L. Neuhäuser   +3 more
wiley   +1 more source

Abundance Ratios in Dwarf Elliptical Galaxies [PDF]

Proceedings of the International Astronomical Union, 2016
AbstractThe aim of this study is to determine abundance ratios and star formation histories (SFH) of dwarf ellipticals in the nearby Virgo cluster. We perform a stellar population analysis of 39 dEs and study them using index-index and scaling relations. We find an unusual behaviour where [Na/Fe] is under-abundant w.r.t.
Sen, Seyda, Peletier, Reynier F., Toloba, Elisa, Mentz, Jaco J.   +3 more
openaire   +4 more sources

JWST Imaging of the Closest Globular Clusters—VI. The Lowest‐Mass Objects in M 4 and the Galactic Bulge

Astronomische Nachrichten, Volume 346, Issue 9, November 2025.
ABSTRACT We present James Webb Space Telescope observations of M 4—the closest globular cluster—that probe the lower Main Sequence down to the hydrogen‐burning limit. The unveiled stellar sequence reaches much fainter luminosities than previously possible, revealing a few extremely red objects that are consistent with brown dwarfs as cool as Teff∼1000K$
L. R. Bedin, R. Gerasimov, A. Calamida, M. Libralato, M. Scalco, D. Nardiello, M. Griggio, D. Apai, J. Anderson, A. Bellini, A. Burgasser   +10 more
wiley   +1 more source

Abundance ratios in dwarf elliptical galaxies [PDF]

Monthly Notices of the Royal Astronomical Society, 2017
We determine abundance ratios of 37 dwarf ellipticals (dEs) in the nearby Virgo cluster. This sample is representative of the early-type population of galaxies in the absolute magnitude range -19.0 < Mr < -16.0. We analyze their absorption line-strength indices by means of index-index diagrams and scaling relations and use the stellar population ...
Şen, Ş., Peletier, R. F., Boselli, A., den Brok, M., Falcón-Barroso, J., Hensler, G., Janz, J., Laurikainen, E., Lisker, T., Mentz, J. J., Paudel, S., Salo, H., Sybilska, A., Toloba, E., van de Ven, G., Vazdekis, A., Yesilyaprak, C.   +16 more
openaire   +9 more sources

HEAD IN THE STARS, FEET ON THE GROUND: Scale and Astronomy Initiatives in Southern Africa

Cultural Anthropology, Volume 40, Issue 4, Page 571-596, November 2025.
ABSTRACT This article explores the evolution of radio astronomy in South Africa and Madagascar, focusing on how “scale” functions as both a way of understanding the world and marking differences in existence. In outer space research, the ground is crucial but often overlooked.
HANNA NIEBER, DAVIDE CHINIGÒ
wiley   +1 more source

Dwarf Galaxies and Cluster Environments

Proceedings of the International Astronomical Union, 2018
AbstractWe report an investigation of the properties of dwarf galaxies (Mr < -15) inside 26 clusters at z = 0.15 – 0.25, using the X-ray data from the Chandra archive, and optical images taken with Subaru Suprime-Cam. Our results include: 1. Investigation of the dwarf galaxy density distribution is sensitive to the background galaxies and the choice
Hashimoto, Y., Henry, J., Boehringer, H.
openaire   +3 more sources