Results 61 to 70 of about 29,281 (217)

The Distance to the Vela Supernova Remnant [PDF]

, 1999
We have obtained high resolution Ca II and Na I absorption line spectra toward 68 OB stars in the direction of the Vela Supernova Remnant. The stars lie at distances of 190 -- 2800 pc as determined by Hipparcos and spectroscopic parallax estimations. The
Alexandra N. Cha, Anthony C. Danks, Crawford I. A., Kenneth R. Sembach, Milne D. K., Sembach K. R.   +5 more
core   +2 more sources

A Possible Solution to the Mystery of the ANITA Anomalous Events

Annalen der Physik, Volume 538, Issue 4, April 2026.
In 2006 and 2014, the Antarctic Impulsive Transient Antenna (ANITA), a balloon‐borne radio observatory flying over Antarctica, detected two strange upward‐going radio pulse events that have not yet been explained by our current understanding of physics.
Massimo Villata
wiley   +1 more source

Influence of an Internal Magnetar on Supernova Remnant Expansion

, 2003
Most of the proposed associations between magnetars and supernova remnant suffer from age problems. Usually, supernova remnants ages are determined from an approximation of the Sedov-Taylor phase relation between radius and age, for a fixed energy of the
Fuchs Y., J. E. Horvath, M. P. Allen, Regimbau T., Taylor G. I., van Paradijs J.   +5 more
core   +3 more sources

Establishing Indium in Frustrated Lewis Pair Chemistry: From Synthesis to Catalytic Applications

ChemistryEurope, Volume 4, Issue 4, April 2026.
Not that hard: The effects of chemical hardness of the soft FLP tBu2InCH2PtBu2 and its pyridine‐adduct tBu2In(py)CH2PtBu2 were examined in adduct formation reactions toward H2, CO2, and CS2. The frustrated Lewis pair shows catalytic activity in the reduction of CO2 with pinacolborane.
Daniel N. Heuer, Jan‐Hendrik Lamm, Hans‐Georg Stammler, Beate Neumann, Andreas Mix, Yury V. Vishnevskiy, Norbert W. Mitzel   +6 more
wiley   +1 more source

Supernova Dust Evolution Probed by Deep-sea 60Fe Time History

The Astrophysical Journal, 2023
There is a wealth of data on live, undecayed ^60 Fe ( t _1/2 = 2.6 Myr) in deep-sea deposits, the lunar regolith, cosmic rays, and Antarctic snow, which is interpreted as originating from the recent explosions of at least two near-Earth supernovae.
Adrienne F. Ertel, Brian J. Fry, Brian D. Fields, John Ellis   +3 more
doaj   +1 more source

Rayleigh-Taylor Instabilities in Type Ia Supernova Remnants undergoing Cosmic-Ray Particle Acceleration - Low Adiabatic Index Solutions

, 2011
This study investigates the evolution of Rayleigh-Taylor (R-T) instabilities in Type Ia supernova remnants that are associated with a low adiabatic index gamma, where gamma < 5/3, which reflects the expected change in the supernova shock structure as a ...
Allen, Aschenbach, Axford, Bartel, Basko, Berezhko, Berezhko, Bietenholz, Blandford, Blasi, Blondin, Butt, Chevalier, Chevalier, Chevalier, Chih-Yueh Wang, Decourchelle, Dickel, Dickel, Dorfi, Drury, Dwarkadas, Dwarkadas, Ellison, Ellison, Ellison, Enomoto, Ferrand, Fesen, Fraschetti, Fujita, Hughes, Hughes, Hungerford, Hwang, Jun, Jun, Jun, Jun, Kang, Katz, Kifonidis, Kifonidis, Koyama, Li, Lo, Mastichiadis, Petre, Reynolds, Reynolds, Reynolds, Reynoso, Skilling, Skilling, Stone, Strom, Tanimori, Velazquez, Wang, Wang, Wang, Wang, Warren, Woosley   +63 more
core   +1 more source

Iron line emission in X-ray afterglows [PDF]

, 2001
Recent observations of X-ray afterglows reveal the presence of a redshifted Kalpha iron line in emission in four bursts. In GRB 991216, the line was detected by the low energy grating of Chandra, which showed the line to be broad, with a full width of ...
Fiore, F., Ghisellini, G., Lazzati, D., Stella, L., Vietri, M.   +4 more
core   +3 more sources

Hitchhiker's Guide to the Swampland: The Cosmologist's Handbook to the String‐Theoretical Swampland Programme

Fortschritte der Physik, Volume 74, Issue 4, April 2026.
Abstract String theory has strong implications for cosmology, implying the absence of a cosmological constant, ruling out single‐field slow‐roll inflation, and that black holes decay. The origins of these statements are elucidated within the string‐theoretical swampland programme.
Kay Lehnert
wiley   +1 more source

Missing Titanium in the Asymmetric Supernova Remnant W 49B

The Astrophysical Journal
The progenitor of the W 49B supernova remnant is still under debate. One of the candidates is a jet-driven core-collapse supernova. In such a highly asymmetric explosion, a strong α -rich freeze-out is expected in local high-entropy regions, which should
Toshiki Sato, Makoto Sawada, Keiichi Maeda, John P. Hughes, Brian J. Williams   +4 more
doaj   +1 more source

SEARCH FOR A COMPACT SCINTILLATING COMPONENT IN SNR 3С58 AT DECAMETER WAVELENGTHS

Radio Physics and Radio Astronomy, 2014
The upper limit for the flux of a compact source of continuum radio emission in SNR 3C58, (2.7 ± 0.9) Jy, was obtained by the highest sensitive observations of interplanetary scintillations at decameter wavelengths.
N. N. Kalinichenko
doaj   +1 more source