Results 171 to 180 of about 205,088 (284)

Cosmic Rays and the Askaryan Effect Reveal Subsurface Structure and Buried Ice on the Moon

Geophysical Research Letters, Volume 52, Issue 6, 28 March 2025.
Abstract We present the first full‐wavelength numerical simulations of the electric field generated by cosmic ray impacts into the Moon. Billions of cosmic rays fall onto the Moon every year. Ultra‐high energy cosmic ray impacts produce secondary particle cascades within the regolith and subsequent coherent, wide‐bandwidth, linearly‐polarized radio ...
E. S. Costello, R. R. Ghent, A. Romero‐Wolf, P. W. Gorham, P. G. Lucey, C. J. Tai Udovicic, P. Linton, A. Ludwig, K. McBride, C. Miki, E. Oberla, J. Rolla, A. Jung   +12 more
wiley   +1 more source

First constraints on iron abundance versus reflection fraction from the Seyfert 1 galaxy MCG-6-30-15 [PDF]

, 1999
Julia C. Lee, A. C. Fabian, W. N. Brandt, C. S. Reynolds, K. Iwasawa   +4 more
openalex   +1 more source

Chemodynamical Model of the Galaxy: Abundance Gradients Predicted for HiiRegions and Planetary Nebulae [PDF]

, 1998
Christine Allen, Leticia Carigi, M. Peimbert   +2 more
openalex   +1 more source

Stellar abundances of early-type galaxies [PDF]

, 2008
It is currently impossible to determine the abundances of stellar populations star-by-star in dense stellar systems more distant than a few megaparsecs. Therefore, methods to analyse the composite light of stellar systems are required. I review recent progress in determining the abundances and abundance ratios of early-type galaxies.
openaire   +3 more sources

On the Evolutionary History of a Simulated Disk Galaxy as Seen by Phylogenetic Trees

The Astrophysical Journal
Phylogenetic methods have long been used in biology and more recently have been extended to other fields—for example, linguistics and technology—to study evolutionary histories.
Danielle de Brito Silva, Paula Jofré, Patricia B. Tissera, Keaghan J. Yaxley, Jenny Gonzalez Jara, Camilla J. L. Eldridge, Emanuel Sillero, Robert M. Yates, Xia Hua, Payel Das, Claudia Aguilera-Gómez, Evelyn J. Johnston, Alvaro Rojas-Arriagada, Robert Foley, Gerard Gilmore   +14 more
doaj   +1 more source

Chemical Abundances of Planetary Nebulae in the Sagittarius Dwarf Elliptical Galaxy [PDF]

, 1997
J. R. Walsh, G. Dudziak, D. Minniti, A. A. Zijlstra   +3 more
openalex   +1 more source

Oxygen Abundances in Diffuse Ellipticals and the Metallicity-Luminosity Relation for Dwarf Galaxies [PDF]

, 1996
M. G. Richer, M. L. McCall, N. Arimoto
openalex   +1 more source

Chemical abundances and ionizing clusters of H ii regions in the LINER galaxy NGC 4258 [PDF]

, 2000
Á. I. Díaz, M. Castellanos, R. Terlevich, M. L. García-Vargas   +3 more
openalex   +2 more sources

Forecasts for Galaxy Formation and Dark Matter Constraints from Dwarf Galaxy Surveys

The Astrophysical Journal
The abundance of faint dwarf galaxies is determined by the underlying population of low-mass dark matter (DM) halos and the efficiency of galaxy formation in these systems. Here, we quantify potential galaxy formation and DM constraints from future dwarf
Ethan O. Nadler, Vera Gluscevic, Trey Driskell, Risa H. Wechsler, Leonidas A. Moustakas, Andrew Benson, Yao-Yuan Mao   +6 more
doaj   +1 more source

Abundances of Red Giants in the Andromeda II Dwarf Spheroidal Galaxy [PDF]

, 1999
Patrick Côté, J. B. Oke, Judith G. Cohen   +2 more
openalex   +1 more source