Results 21 to 30 of about 30,924 (78)

Robust Detection of Hot Intragroup Medium in Optically Selected, Poor Galaxy Groups by eROSITA

The Astrophysical Journal Letters
Over the last several decades, extensive research has been conducted on the baryon cycles within cosmic structures, encompassing a broad mass range from dwarf galaxies to galaxy clusters. However, a notable gap in understanding the cosmic baryon cycle is
Dawei Li, Taotao Fang, Chong Ge, Teng Liu, Lin He, Zhiyuan Li, Fabrizio Nicastro, Xiaohu Yang, Xiaoxia Zhang, Yun-Liang Zheng   +9 more
doaj   +1 more source

Hints against the cold and collisionless nature of dark matter from the galaxy velocity function [PDF]

, 2017
The observed number of dwarf galaxies as a function of rotation velocity is significantly smaller than predicted by the standard model of cosmology. This discrepancy cannot be simply solved by assuming strong baryonic feedback processes, since they would
Lake, George, Papastergis, Emmanouil, Reed, Darren S., Schneider, Aurel, Trujillo-Gomez, Sebastian   +4 more
core   +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

Tools for Learning—Promoting Reflection for Student Teachers' Development of PCK

Journal of Research in Science Teaching, Volume 62, Issue 8, Page 1902-1922, October 2025.
ABSTRACT This paper investigates how the coherent integration of three different tools for reflection during a science methods course can contribute to student teachers' planning and enactment of science teaching, that is, their development of pedagogical content knowledge (PCK).
Pernilla Nilsson, Anne‐Marie Cederqvist   +1 more
wiley   +1 more source

The Milky Way's bright satellites as an apparent failure of LCDM

, 2012
We use the Aquarius simulations to show that the most massive subhalos in galaxy-mass dark matter halos in LCDM are grossly inconsistent with the dynamics of the brightest Milky Way dwarf spheroidal galaxies.
Ando, Barkana, Barnes, Behroozi, Benson, Besla, Blanton, Bovill, Bovill, Bovill, Bovy, Boyarsky, Boylan-Kolchin, Boylan-Kolchin, Boylan-Kolchin, Boylan-Kolchin, Boylan-Kolchin, Bryan, Bullock, Busha, Busha, Conroy, Davé, De Lucia, Dehnen, Dekel, di Cintio, Diemand, Efstathiou, Einasto, Feng, Font, Gao, Gao, Gao, Gnedin, Gnedin, Gnedin, Gnedin, Governato, Gunn, Guo, Guo, Harris, Hayashi, Hernquist, Hoeft, James S. Bullock, Jardel, Kallivayalil, Kirby, Klypin, Klypin, Komatsu, Koposov, Koposov, Kravtsov, Kravtsov, Kravtsov, Kuhlen, Kuzio de Naray, Larson, Li, Li, Li, Loeb, Lovell, Ludlow, Lunnan, Macciò, Macciò, Madau, Madau, Manoj Kaplinghat, Martin, Mateo, McMillan, Merritt, Michael Boylan-Kolchin, Moore, Moster, Murray, Muñoz, Navarro, Navarro, Navarro, Neistein, Oh, Oh, Okamoto, Okamoto, Olsen, Papastergis, Parry, Peñarrubia, Piatek, Polisensky, Press, Rashkov, Read, Reid, Reines, Ricotti, Robertson, Sawala, Schechter, Shattow, Somerville, Spergel, Springel, Springel, Springel, Springel, Stanimirović, Stoehr, Strigari, Strigari, Strigari, Strigari, Tassis, Thomas, Thoul, Tikhonov, Tinker, Tollerud, Tollerud, Tremaine, van den Bosch, Wadepuhl, Walker, Walter, Watkins, White, Wolf, Xue, Yoshida   +135 more
core   +1 more source

Small Dwarf Galaxies Within Larger Dwarfs: Why Some Are Luminous While Most Go Dark [PDF]

, 2008
We consider the possibility that the Magellanic Clouds were the largest members of a group of dwarf galaxies that entered the Milky Way (MW) halo at late times. Seven of the eleven brightest satellites of the MW may have been part of this system.
Alcock, Avila-Reese, Belokurov, Bertschinger, Besla, Bullock, Colin, D'Onghia, D'Onghia, Elena D'Onghia, George Lake, Grebel, Gyuk, Kallivayalil, Kallivayalil, Kauffmann, Kerr, Kim, Klypin, Koch, Kravtsov, Kunkel, Lin, Lynden-Bell, Lynden-Bell, Metz, Moore, Navarro, Palanque-Delabrouille, Simon, Somerville, Spergel, Stadel, Stanimirovic, Strigari, Tully, Willman, Willman, Zentner, Zentner, Zucker   +40 more
core   +1 more source

The Effect of Seductive Details on Knowledge Retention in Physics Videos: A Mixed Methods Study

Journal of Research in Science Teaching, Volume 62, Issue 8, Page 1923-1940, October 2025.
ABSTRACT Research reports that interesting but irrelevant information, seductive details, in teaching material can impede learning. In science education, the inclusion of historical narratives in lessons to promote interest has been recommended but may hinder learning.
Richard Brock, Liam Cini O'Dwyer, Ben Rogers   +2 more
wiley   +1 more source

HSTPROMO Internal Proper-motion Kinematics of Dwarf Spheroidal Galaxies. I. Velocity Anisotropy and Dark Matter Cusp Slope of Draco

The Astrophysical Journal
We analyze four epochs of Hubble Space Telescope imaging over 18 yr for the Draco dwarf spheroidal galaxy. We measure precise proper motions for hundreds of stars and combine these with existing line-of-sight (LOS) velocities.
Eduardo Vitral, Roeland P. van der Marel, Sangmo Tony Sohn, Mattia Libralato, Andrés del Pino, Laura L. Watkins, Andrea Bellini, Matthew G. Walker, Gurtina Besla, Marcel S. Pawlowski, Gary A. Mamon   +10 more
doaj   +1 more source

Star forming dwarf galaxies

, 2011
Star forming dwarf galaxies (SFDGs) have a high gas content and low metallicities, reminiscent of the basic entities in hierarchical galaxy formation scenarios.
A Adamo, A Begum, A Dekel, A Leroy, AO Razoumov, AT Marlowe, BG Elmegreen, C Kehrig, C Weidner, CA Tremonti, CE Simpson, CW Engelbracht, D Kunth, D Kunth, D Kunth, D Kunth, D Kunth, DA Hunter, DA Hunter, DA Hunter, DA Hunter, DA Hunter, DG Barnes, DI Méndez, DK Strickland, DR Garnett, E Tolstoy, E Zackrisson, ED Skillman, ED Skillman, F Walter, F Zwicky, FP Israel, G Efstathiou, G Östlin, G Östlin, G Östlin, G Östlin, G Östlin, GH Rieke, GJ Stacey, GL Hoffman, GL Hoffman, GR Meurer, GR Meurer, H Hirashita, H Lee, H Lee, H Loose, H Yang, ID Karachentsev, J Brinchmann, J Koeppen, J Lequeux, J Lequeux, J Masegosa, J Roennback, J Silk, JC Lee, JH Knapen, JI Davies, JJ Condon, JJ Dalcanton, JJ Dalcanton, JJ Salzer, JM Cannon, JM Scalo, JM Schombert, JP Grimes, JS Gallagher III, JS Gallagher III, KBW McQuinn, KBW McQuinn, KBW McQuinn, KG Noeske, L Mayer, L Mayer, L Mayer, L Searle, L Searle, L Staveley-Smith, L Zee van, L Zee van, LA Sargsyan, LK Summers, LK Summers, LM Cairós, LS Pilyugin, M Asplund, M Dahlem, M Drinkwater, M Geha, M Hayes, M Mac Low, M Ouchi, M Schmidt, MK Crawford, MR Blanton, MR Krumholz, N Bergvall, N Bergvall, N Bergvall, N Bergvall, NG Guseva, NY Gnedin, P Papaderos, P Papaderos, P Papaderos, P Papaderos, PA James, PW Hodge, R Giovanelli, RA Overzier, RA Pildis, RB Larson, RB Larson, RB Larson, RC Kennicutt Jr, RC Kennicutt Jr, RJ Bouwens, RJ Bouwens, RW Oconnell, S Recchi, S Roychowdhury, S Roychowdhury, SA Pustilnik, SC Madden, SD Rosenbaum, SS McGaugh, T Fang, T Marquart, TI Larsen, TM Heckman, TM Heckman, TX Thuan, U Lisenfeld, V Burkholder, V Lapparent de, WJG Blok de, WK Huchtmeier, X Dai, Y Harayama, Y Komiyama, YI Izotov, YI Izotov, YI Izotov, YI Izotov   +146 more
core   +1 more source

The Baryon Cycle of Dwarf Galaxies: Dark, Bursty, Gas-Rich Polluters [PDF]

, 2014
We present results from a fully cosmological, very high-resolution, LCDM "zoom-in" simulation of a group of seven field dwarf galaxies with present-day virial masses in the range M_vir=4.4e8-3.6e10 Msun.
Conroy, Charlie, Governato, Fabio, Madau, Piero, Mayer, Lucio, Shen, Sijing   +4 more
core   +1 more source