Results 131 to 140 of about 11,545 (216)

Ultradiffuse Galaxies—A Distinct Population? Dwarf Galaxies in the Coma Cluster and A262 from Deep u′–g′–r′ Wendelstein Imaging Data

The Astrophysical Journal Supplement Series
In this study, we compare the structural parameters of ultradiffuse galaxies (UDGs) to those of other dwarf galaxies and investigate whether UDGs form a distinct population.
Raphael Zöller, Matthias Kluge, Benjamin Staiger, Ralf Bender   +3 more
doaj   +1 more source

Sagittarius dwarf spheroidal galaxy observed by H.E.S.S

, 2013
Dwarf spheroidal galaxies are characterized by a large measured mass-to-light ratio and are not expected to be the site of high-luminosity non-thermal high-energy gamma-ray emissions.
Farnier, C., Jacholkowska, A., Kieffer, M., Lamanna, G., Trichard, C.   +4 more
core   +1 more source

Self-interacting Dark Matter Interpretation of Crater II

The Astrophysical Journal Letters
The satellite galaxy Crater II of the Milky Way is extremely cold and exceptionally diffuse. These unusual properties are challenging to understand in the standard model of cold dark matter.
Xingyu Zhang, Hai-Bo Yu, Daneng Yang, Haipeng An   +3 more
doaj   +1 more source

Searching for Extragalactic Exoplanets: A Survey of the Sagittarius Dwarf Galaxy Stream with TESS

The Astronomical Journal
To date no confirmed exoplanets have been detected outside the Milky Way, and their extragalactic occurrence rates are poorly constrained. Using available data from TESS, we perform the first transit survey of the Sagittarius dwarf galaxy stream using 15,
William Schap, Jason Dittmann, Elizabeth Lada   +2 more
doaj   +1 more source

The Origin of High-velocity Stars Considering the Impact of the Large Magellanic Cloud

The Astronomical Journal
Utilizing astrometric parameters sourced from Gaia Data Release 3 and radial velocities obtained from various spectroscopic surveys, we identify 519 high-velocity stars (HiVels) with a total velocity in the Galactocentric rest frame greater than 70% of ...
Jiwei Liao, Cuihua Du, Mingji Deng, Dashuang Ye, Hefan Li, Yang Huang, Jianrong Shi, Jun Ma   +7 more
doaj   +1 more source

Probing late-time annihilations of oscillating asymmetric dark matter via rotation curves of galaxies

European Physical Journal C: Particles and Fields
In this paper, we explore the Oscillating Asymmetric Dark Matter (OADM) model to address the core-cusp problem, aiming to resolve the discrepancy between the predictions of the $$\Lambda \textrm{CDM}$$ Λ CDM cosmological model and the observed dark ...
Júlia G. Mamprim, Guillermo Gambini, Luan B. Arbeletche, Marcos Olegario, Vitor de Souza   +4 more
doaj   +1 more source

Stellar Variability and Distance Indicators in the Near-infrared in Nearby Galaxies. II. Pulsating Stars in the Carina Dwarf Spheroidal

The Astronomical Journal
We present homogeneous, near-infrared ( JHK _s bands) time-series observations of the classical Carina dwarf spheroidal (dSph) galaxy to determine accurate and precise distances using the pulsating stars as standard candles.
Chow-Choong Ngeow, Anupam Bhardwaj, Prashant Nishad, Susmita Das   +3 more
doaj   +1 more source

Signatures of a Tidally Induced Spiral Arm at the Anticenter of the Milky Way and a Kinematically Extended Anticenter Stream Using DESI Data Release 2

The Astronomical Journal
Using the Dark Energy Spectroscopic Instrument (DESI) Milky Way Survey, we examine the six-dimensional space of the anticenter region of the Milky Way stellar disk (150° < Galactic longitude < 220°) using 61,883 main-sequence turnoff stars.
Mika Lambert, Constance M. Rockosi, Sergey E. Koposov, Ting S. Li, Monica Valluri, Leandro Beraldo e Silva, Songting Li, João A. S. Amarante, Amanda Byström, Gustavo E. Medina, Nathan R. Sandford, Joan Najita, Namitha Kizhuprakkat, Jessica N. Aguilar, Steven Ahlen, Davide Bianchi, David Brooks, Todd Claybaugh, Kyle Dawson, Axel de la Macorra, Peter Doel, Jaime E. Forero-Romero, Enrique Gaztañaga, Satya Gontcho A Gontcho, Gaston Gutierrez, Richard Joyce, Anthony Kremin, Claire Lamman, Martin Landriau, Laurent Le Guillou, Marc Manera, Aaron Meisner, Ramon Miquel, John Moustakas, Adam Myers, Seshadri Nadathur, Will Percival, Francisco Prada, Ignasi Pérez-Ràfols, Graziano Rossi, Eusebio Sanchez, David Schlegel, Michael Schubnell, Joseph H. Silber, David Sprayberry, Gregory Tarlé, Benjamin A. Weaver, Rongpu Zhou, Hu Zou   +48 more
doaj   +1 more source

Assessing the Association between the Globular Cluster NGC 4147 and the Sagittarius Dwarf Galaxy

The Astronomical Journal
The potential association of the globular cluster (GC) NGC 4147 with the Sagittarius (Sgr) dwarf spheroidal galaxy has been proposed due to their comparable locations and radial velocities. However, there are still debates about this connection.
Ying-Hua Zhang, Jundan Nie, Hao Tian, Chao Liu   +3 more
doaj   +1 more source

Ruling out dark matter interpretation of the galactic GeV excess by gamma-ray data of galaxy clusters. [PDF]

Sci Rep, 2017
Chan MH, Leung CH.
europepmc   +1 more source