Results 71 to 80 of about 53,924 (236)

Antimatter Gravity and the Results of the ALPHA‐g Experiment

Annalen der Physik, Volume 536, Issue 7, July 2024.
The recent results of the ALPHA‐g experiment, which show gravitational attraction between antihydrogen atoms and the Earth, seem to undermine the success of repulsive‐gravity models in the cosmological field. Analyzing the theory of CPT gravity, two solutions are found that are consistent with the experimental results, while preserving the large‐scale ...
Massimo Villata
wiley   +1 more source

Measurement of the Cosmic Optical Background using the Long Range Reconnaissance Imager on New Horizons

, 2017
The cosmic optical background is an important observable that constrains energy production in stars and more exotic physical processes in the universe, and provides a crucial cosmological benchmark against which to judge theories of structure formation ...
Cooray, Asantha, Immel, Poppy, Lisse, Carey M., Nguyen, Chi, Poppe, Andrew R., Zemcov, Michael   +5 more
core   +1 more source

Probing extreme black‐hole outflows on short timescales via high spectral‐resolution x‐ray imagers

Astronomische Nachrichten, Volume 345, Issue 6-7, July-August 2024.
Abstract We investigate outflows and the physics of super‐Eddington versus sub‐Eddington regimes in black hole systems. Our focus is on prospective science using next‐generation high‐resolution soft x‐ray instruments. We highlight the properties of black hole ultraluminous x‐ray source (ULX) systems in particular. Owing to scale invariance in accreting
C. Pinto, J. F. Steiner, A. Bodaghee, P. Chakraborty, M. Sobolewska, D. R. Pasham, A. Ogorzalek, J. Zuhone, A. Bogdan, M. Vogelsberger   +9 more
wiley   +1 more source

Environments of Luminous Low-frequency Radio Galaxies Since Cosmic Noon: Jet-mode Feedback Dominates in Groups

The Astrophysical Journal
Coupling between relativistic jets launched by accreting supermassive black holes and the surrounding gaseous media is a vital ingredient in galaxy evolution models.
Grayson C. Petter, Ryan C. Hickox, Leah K. Morabito, David M. Alexander   +3 more
doaj   +1 more source

Galactic and Extragalactic Samples of Supernova Remnants: How They Are Identified and What They Tell Us

, 2017
Supernova remnants (SNRs) arise from the interaction between the ejecta of a supernova (SN) explosion and the surrounding circumstellar and interstellar medium. Some SNRs, mostly nearby SNRs, can be studied in great detail. However, to understand SNRs as
A Rest, A Rest, B Aschenbach, BE Westerlund, BF Williams, BM Gaensler, BW Grefenstette, C Badenes, C Badenes, CK Kumar, CK Lacey, D Milisavljevic, D Milisavljevic, D Pinheiro Gonçalves, D Urošević, DA Green, DA Green, DH Clark, DM Fenech, DM Matonick, DS Mathewson, DS Mathewson, DS Mathewson, DS Mathewson, E Oliva, E Oliva, E Sonbas, E Sonbaş, EA Magnier, EG Berezhko, EJ Crawford, EM Berkhuijsen, F Haberl, F Vogt, FD Seward, FD Seward, Fermi LAT Collaboration et al, G Dubner, GL Case, H Mouri, H Stiele, I Leonidaki, I Leonidaki, IJ Danziger, IR Tuohy, IS Shklovskii, JA Morse, JC Raymond, JC Raymond, JE Drew, JE Drew, JH Lee, JH Lee, JJ Lee, JL Payne, JL Payne, JL Payne, JM Saken, JN Clarke, JP Hughes, JP Hughes, JR Dickel, JU Busser, JY Seok, K Koyama, KA Arnaud, KD Kuntz, KS Long, KS Long, KS Long, KS Long, KS Long, KS Long, L Chomiuk, L Chomiuk, L Sabin, M Sasaki, MA Dopita, MA Dopita, MA Greenhouse, MD Filipović, MG Allen, MG Lee, MM Vučetić, MZ Pavlovic, MZ Pavlović, NA Franchetti, O Kargaltsev, O Krause, P Kahabka, P Maggi, P Massey, P Predehl, PF Winkler, PF Winkler, PP Kronberg, R Braun, R Minkowski, RA Chevalier, RA Chevalier, RA Fesen, RA Fesen, RA Fesen, RG Arendt, RP Kirshner, RP Kirshner, S Dodorico, S Dodorico, S D’Odorico, S Park, SC Russell, SL Finkelstein, SM Gordon, SM Gordon, SP Reynolds, SR Kulkarni, T DeLaney, T Güver, T Morel, TA Thompson, TG Pannuti, TG Pannuti, TJ Galvin, TL Cline, VV Dwarkadas, W Li, W Pietsch, WC Millar, WJ Robbins, WM Goss, WP Blair, WP Blair, WP Blair, WP Blair, WP Blair, WP Blair, WP Blair, WP Blair, WT Reach, X Barcons, YH Chu, YH Chu, ZG Jennings, ZG Jennings, ZP Huang   +144 more
core   +1 more source

JWST imaging of the closest globular clusters—I. Possible infrared excess among white dwarfs in NGC 6397

Astronomische Nachrichten, Volume 345, Issue 6-7, July-August 2024.
Abstract We present James Webb Space Telescope observations of the globular cluster NGC 6397 and use them to extend to infrared wavelengths the characterization of the cluster's entire white dwarf (WD) cooling sequence (CS). The data allows us to probe fundamental astrophysical WD properties and to search for evidence in their colors for (or against ...
L. R. Bedin, D. Nardiello, M. Salaris, M. Libralato, P. Bergeron, A. J. Burgasser, D. Apai, M. Griggio, M. Scalco, J. Anderson, R. Gerasimov, A. Bellini   +11 more
wiley   +1 more source

An Extragalactic Widefield Search for Technosignatures with the Murchison Widefield Array

The Astrophysical Journal
It is common for surveys that are designed to find artificial signals generated by distant civilizations to focus on galactic sources. Recently, researchers have started focusing on searching for all other sources within the field observed, including the
C. D. Tremblay, S. J. Tingay
doaj   +1 more source

Gaia23ckh: Symbiotic outburst of the assumed Mira variable V390 Sco

Astronomische Nachrichten, Volume 345, Issue 5, June 2024.
Abstract The poorly studied variable star V390 Sco, previously classified as a Mira pulsator, was detected in a brightening event by the ESA Gaia satellite in September 2023. This work presents an analysis of available archival multifrequency photometric data of this target, along with our spectroscopic observations. Our findings lead to the conclusion
Jaroslav Merc, Peter Velez, Stéphane Charbonnel, Olivier Garde, Pascal Le Dû, Lionel Mulato, Thomas Petit, Jan Skowron   +7 more
wiley   +1 more source

Lessons from the apparent peculiar nature of the star TYC 6544‐3483‐1

Astronomische Nachrichten, Volume 345, Issue 4, May 2024.
Abstract We report a radio and optical study of the star TYC 6544‐3483‐1 originally selected as a follow‐up target in the course of our efforts to cross‐identify Galactic high‐energy sources. The star by itself finally turned out to be a very ordinary main‐sequence star despite the initial expectations that apparently pointed to the contrary.
Josep Martí, Pedro L. Luque‐Escamilla, Benito Marcote, Daniel del Ser, Gustavo E. Romero, Cintia S. Peri   +5 more
wiley   +1 more source

The Study of Radio Flux Density Variations of the Quasar OJ 287 by the Wavelet and the Singular Spectrum Methods

Open Astronomy, 2016
Flux density variations of the extragalactic radio source OJ 287 are studied by applying the wavelet and the singular spectrum methods to the long-term monitoring data at 14.5, 8.0 and 4.8 GHz acquired at the University of Michigan Radio Astronomy ...
Donskykh Ganna
doaj   +1 more source