Results 91 to 100 of about 402,684 (314)

STELLAR KINEMATICS AND METALLICITIES IN THE ULTRA-FAINT DWARF GALAXY RETICULUM II [PDF]

, 2015
We present Magellan/M2FS, Very Large Telescope/GIRAFFE, and Gemini South/GMOS spectroscopy of the newly discovered Milky Way satellite Reticulum II. Based on the spectra of 25 Ret II member stars selected from Dark Energy Survey imaging, we measure a ...
J. Simon, A. Drlica-Wagner, Ting S. Li, B. Nord, M. Geha, K. Bechtol, E. Balbinot, E. Buckley-Geer, Huan Lin, J. Marshall, B. Santiago, L. Strigari, Mei-Yu Wang, Risa Wechsler, Risa Wechsler, B. Yanny, T. Abbott, A. Bauer, Gary Bernstein, E. Bertin, D. Brooks, D. Burke, D. Burke, D. Capozzi, A. Rosell, M. Kind, M. Kind, C. D'Andrea, L. Costa, D. DePoy, S. Desai, H. Diehl, S. Dodelson, S. Dodelson, C. Cunha, J. Estrada, A. Evrard, A. F. Neto, E. Fernandez, D. Finley, B. Flaugher, J. Frieman, J. Frieman, E. Gaztañaga, D. Gerdes, D. Gruen, R. Gruendl, R. Gruendl, K. Honscheid, D. James, S. Kent, K. Kuehn, N. Kuropatkin, O. Lahav, M. Maia, M. March, P. Martini, C. Miller, R. Miquel, R. Ogando, A. Romer, A. Roodman, A. Roodman, E. Rykoff, E. Rykoff, M. Sako, E. Sánchez, M. Schubnell, I. Sevilla, R. C. Smith, M. Soares-Santos, F. Sobreira, E. Suchyta, M. Swanson, G. Tarlé, J. Thaler, D. Tucker, V. Vikram, A. Walker, W. Wester   +79 more
semanticscholar   +1 more source

Dense cloud cores revealed by CO in the low metallicity dwarf galaxy WLM [PDF]

Nature, 2015
Understanding stellar birth requires observations of the clouds in which they form. These clouds are dense and self-gravitating, and in all existing observations they are molecular, with H2 the dominant species and carbon monoxide (CO) the best available
M. Rubio, B. Elmegreen, D. Hunter, E. Brinks, J. Cortés, P. Cigan   +5 more
semanticscholar   +1 more source

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

Dwarf Galaxy Formation Induced by Galaxy Interactions [PDF]

The Astrophysical Journal, 2000
9 pages (including 1 figure), To appear in ApJ, 543 (Part 1) Nov 1, 2000 (ApJ volume Nr was wrong in the previous version ...
Okazaki, T., Taniguchi, Y.
openaire   +2 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

Energy Evolution in the Progenitor of Galaxy Shells: A Semi-analytical Model

The Astrophysical Journal
The stellar shells surrounding an elliptical galaxy, as remnants of a dwarf galaxy disrupted during merging, reveal the distribution of energy and angular momentum of the progenitor dwarf galaxy. We develop a semi-analytical model to describe the changes
Beibei Guo, Xufen Wu, HongSheng Zhao, Lulu Fan   +3 more
doaj   +1 more source

HYDRA II: A FAINT AND COMPACT MILKY WAY DWARF GALAXY FOUND IN THE SURVEY OF THE MAGELLANIC STELLAR HISTORY [PDF]

, 2015
We present the discovery of a new dwarf galaxy, Hydra II, found serendipitously within the data from the ongoing Survey of the Magellanic Stellar History conducted with the Dark Energy Camera on the Blanco 4 m Telescope.
N. Martin, N. Martin, D. Nidever, G. Besla, K. Olsen, A. Walker, A. K. Vivas, R. Gruendl, C. Kaleida, R. Muñoz, R. Blum, A. Saha, B. Conn, E. Bell, Y. Chu, Y. Chu, M. Cioni, T. D. Boer, C. Gallart, C. Gallart, Shoko Jin, A. Kunder, S. Majewski, D. Martínez-Delgado, A. Monachesi, M. Monelli, M. Monelli, Lara Monteagudo, Lara Monteagudo, N. Noël, E. Olszewski, G. Stringfellow, R. V. D. Marel, D. Zaritsky   +33 more
semanticscholar   +1 more source

The formation of ultra-compact dwarf galaxies and nucleated dwarf galaxies [PDF]

Monthly Notices of the Royal Astronomical Society, 2008
Ultra compact dwarf galaxies (UCDs) have similar properties as massive globular clusters or the nuclei of nucleated galaxies. Recent observations suggesting a high dark matter content and a steep spatial distribution within groups and clusters provide new clues as to their origins.
Goerdt, T, Moore, B, Kazantzidis, S, Kaufmann, T, Maccio, A, Stadel, J   +5 more
openaire   +4 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

Low-mass Galaxy Interactions Trigger Black Hole Activity

The Astrophysical Journal Letters
The existence of high- z overmassive supermassive black holes represents a major conundrum in our understanding of black hole evolution. In this Letter, we probe from the observational point of view how early Universe environmental conditions could have ...
Marko Mićić, Jimmy A. Irwin, Preethi Nair, Brenna N. Wells, Olivia J. Holmes, Jackson T. Eames   +5 more
doaj   +1 more source