Results 81 to 90 of about 334,147 (281)

An Accreting Supermassive Black Hole Buried in a Faint Dwarf Galaxy

The Astrophysical Journal Letters
In the last decade, there have been several discoveries of active galactic nuclei (AGN) in dwarf galaxies including an AGN in an ultracompact dwarf galaxy with a black hole mass >10 ^6 M _⊙ .
Abhishek Paswan, Mousumi Das, K Rubinur
doaj   +1 more source

The Andromeda Galaxy and Its Star Formation History

Universe, 2023
The state of knowledge of the properties of the Andromeda Galaxy (also known as M31) is reviewed. The spatial structure of the Andromeda Galaxy, its main source populations, and the properties of its gas and dust are discussed.
Denis Leahy
doaj   +1 more source

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

Journal of Research in Science Teaching, EarlyView.
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

Gas heating from spinning and non-spinning evaporating primordial black holes

Physics Letters B, 2021
Primordial black holes (PBHs) from the early Universe constitute a viable dark matter (DM) candidate and can span many orders of magnitude in mass. Light PBHs with masses around 1015 g contribute to DM and will efficiently evaporate through Hawking ...
Ranjan Laha, Philip Lu, Volodymyr Takhistov   +2 more
doaj   +1 more source

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

Journal of Research in Science Teaching, EarlyView.
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

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

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

Ratio, EarlyView.
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

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

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

A Role for the Plastidial GPT2 Translocator in the Modulation of Lignin Biosynthesis

Plant, Cell &Environment, Volume 48, Issue 9, Page 6458-6472, September 2025.
ABSTRACT Engineering plants with reduced lignin content can result in pleiotropic growth defects. In stems of Arabidopsis plants with reduced expression of hydroxycinnamoyl CoA: shikimate hydroxycinnamoyl transferase (HCT), the plastidial glucose 6‐phosphate: phosphate co‐transporter GPT2 is highly overexpressed, and this coincides with reduced lignin ...
Aditi Subramani Raju, Abira Sahu, Chunliu Zhuo, Wayne K. Versaw, Richard A. Dixon   +4 more
wiley   +1 more source