Results 51 to 60 of about 2,193 (202)

X‐Raying Neutral Density Disturbances in the Mesosphere and Lower Thermosphere Induced by the 2022 Hunga‐Tonga Volcano Eruption‐Explosion

Geophysical Research Letters, Volume 51, Issue 20, 28 October 2024.
Abstract We present X‐ray observations of the upper atmospheric density disturbance caused by the explosive eruption of the Hunga Tonga‐Hunga Ha'apai (HTHH) volcano on 15 January 2022. From 14 January to 16 January, the Chinese X‐ray astronomy satellite, Insight‐HXMT, was observing the supernova remnant Cassiopeia A.
Satoru Katsuda, Hiroyuki Shinagawa, Hitoshi Fujiwara, Hidekatsu Jin, Yasunobu Miyoshi, Yoshizumi Miyoshi, Yuko Motizuki, Motoki Nakajima, Kazuhiro Nakazawa, Kumiko K. Nobukawa, Yuichi Otsuka, Atsushi Shinbori, Takuya Sori, Chihiro Tao, Makoto S. Tashiro, Yuuki Wada, Takaya Yamawaki   +16 more
wiley   +1 more source

FOCUSING OF 3C144 SOURCE RADIATION BY THE SOLAR CORONA

Odessa Astronomical Publications, 2012
The research of solar corona by the compact cosmic source radiation was made on URAN-4 radio telescope. In the period from June 6 to June 20 2012 the flow of Crab nebula was measured on the 20 MHz and 25 MHz frequencies. During the eclipse we observe the
V. V. Galanin, V. G. Derevjagin, R. O. Kravetz   +2 more
doaj   +1 more source

Anticorrelation Between Flux and Photon Index of Hard-X-Ray Emission from the Crab

The Astrophysical Journal
Using Swift Burst Alert Telescope event-mode data during gamma-ray burst occurrences, we conduct spectral analysis for the Crab system. From 38 good observations, which span a period of 18 yr from 2006 to 2023, we find that the Crab’s X-ray flux not only
Koothodil Abhijith Augustine, Hsiang-Kuang Chang   +1 more
doaj   +1 more source

Photon splitting bound on Lorentz Violation in QED from multi-TeV photon observation.

EPJ Web of Conferences, 2018
We calculate the width of photon splitting to three photons in a special model of quantum electrodynamics with broken Lorentz invariance. This process may lead to a sharp cut-off in a photon spectrum of a given astrophysical source.
Astapov Konstantin, Satunin Petr, Kirpichnikov Dmitry   +2 more
doaj   +1 more source

Analysis of the structural complexity of Crab Nebula observed at radio frequency using a multifractal approach

Journal of Physics: Complexity
The Crab Nebula is an astrophysical system that exhibits complex morphological patterns at different observing frequencies. We carry out a systematic investigation of the structural complexity of the nebula using publicly available imaging data at radio ...
Athokpam Langlen Chanu, Pravabati Chingangbam, Fazlu Rahman, R K Brojen Singh, Preeti Kharb   +4 more
doaj   +1 more source

High-sensitivity Beamformed Observations of the Crab Pulsar's Radio Emission

The Astrophysical Journal, 2023
We analyzed four epochs of beamformed European VLBI Network data of the Crab Pulsar at 1658.49 MHz. With the high sensitivity resulting from resolving out the Crab Nebula, we are able to detect even the faint high-frequency components in the folded ...
Rebecca Lin, Marten H. van Kerkwijk
doaj   +1 more source

BatAnalysis: A Comprehensive Python Pipeline for Swift BAT Survey Analysis

The Astrophysical Journal, 2023
The Swift Burst Alert Telescope (BAT) is a coded-aperture gamma-ray instrument with a large field of view that primarily operates in survey mode when it is not triggering on transient events.
Tyler Parsotan, Sibasish Laha, David M. Palmer, Amy Lien, S. Bradley Cenko, Hans Krimm, Craig Markwardt   +6 more
doaj   +1 more source

The ultraviolet spectrum of the Crab Nebula

The Astrophysical Journal, 1982
Ultraviolet spectroscopy of the Crab Nebula done by the International Ultraviolet Explorer satellite is described, and an estimate of the carbon abundance is made, noting data reduction to remove spectral defects caused by radiation hits. The important C IV 1549, He II 1640, and semiforbidden C III 1908 emission line intensities were measured and upper
Davidson, K, Gull, TR, Maran, SP, Stecher, TP, Fesen, RA, Parise, RA, Harvel, CA, Kafatos, M, Trimble, VL   +8 more
openaire   +4 more sources

Multiband observations of the Crab Nebula

Journal of Physics: Conference Series, 2017
Results of simultaneous imaging of the Crab Nebula in the radio (JVLA), optical (HST), and X-ray (Chandra) bands are presented. The images show a variety of small-scale structures, including wisps mainly located to the north-west of the pulsar and knots forming a ring-like structure associated with the termination shock of the pulsar wind.
Krassilchtchikov, A. M., Bykov, A. M., Castelletti, Gabriela Marta, Dubner, Gloria Mabel, Kargaltsev, O. Yu, Pavlov, G. G.   +5 more
openaire   +3 more sources

Crab Nebula of Life [PDF]

Molecular Biology and Evolution, 2014
Crabs—those sometimes pesky, hard-shelled beachcombers—are a highly diverse animal, with some 7,000 species found in oceans, lakes, and on land, varying in size from the diminutive pea crab (millimeters) to the giant 4-m wide Japanese spider crab. Tsang et al. (2014) have constructed the most complete and extensive data set to date.
openaire   +2 more sources