Results 131 to 140 of about 368,263 (301)

Flux and color variations of the quadruply imaged quasar HE 0435-1223

, 2011
We present VRi photometric observations of the quadruply imaged quasarHE0435-1223, carried out with the Danish 1.54 m telescope at the La Silla Observatory.
Ricci, D., Anguita A., Timo
openaire   +4 more sources

The Structure and Variability of Sagittarius A*: Zooming in to the Supermassive Black Hole at the Galactic Center [PDF]

arXiv, 2002
The Galactic center provides a unique astrophysical laboratory for us to study various astrophysical processes. In this paper, we review and outline the latest results from observations of Sgr~A$^*$ in terms of source structure and variations in flux density.
arxiv  

Origin of the Laser‐Induced Picosecond Spin Current Across Magnetization Compensation in Ferrimagnetic GdCo

Advanced Optical Materials, EarlyView.
Picosecond spin current pulses generated by ferrimagnetic GdCo are studied via THz emission spectroscopy. Due to the GdCo micromagnetic structure, the spin current vanishes at compensation when a magnetic field is applied but persists for zero field. At room temperature, the THz spin current is dominated by Co. At low temperatures, Gd can significantly
Guillermo Nava Antonio, Quentin Remy, Jun‐Xiao Lin, Yann Le Guen, Dominik Hamara, Jude Compton‐Stewart, Joseph Barker, Thomas Hauet, Michel Hehn, Stéphane Mangin, Chiara Ciccarelli   +10 more
wiley   +1 more source

How Are the Abnormally Hot Chromosphere and Corona Heated by the Solar Magnetic Fields?

The Astrophysical Journal
The corona is a structure possessed by stars, including the Sun. The abnormal heating of the solar corona and chromosphere is one of the greatest mysteries in modern astronomy.
K. J. Li, J. C. Xu, W. Feng, J. L. Xie, X. J. Shi, L. H. Deng   +5 more
doaj   +1 more source

The brightest OH maser in the sky: a flare of emission in W75 N

, 2005
A flare of maser radio emission in the OH-line 1665 MHz has been discovered in the star forming region W75 N in 2003, with the flux density of about 1000 Jy.
A. L. Argon, A. V. Alakoz, B. Hutawarakorn, D. S. Shepherd, E. E. Baart, E. E. Lekht, I. E. Val’tts, J. L. Caswell, J. M. Torrelles, L. I. Matveyenko, M. V. Popov, T. R. Hunter, V. I. Slysh, V. I. Slysh, V. I. Slysh, V. Minier, W. Driel van, Z. Abraham   +17 more
core   +1 more source

An estimate of the time variation of the abundance gradient from planetary nebulae III. O, S, Ar, and Ne: A comparison of PN samples [PDF]

arXiv, 2006
The time behaviour of the radial abundance gradients in the galactic disk is investigated on the basis of four different samples of planetary nebulae, comprising both smaller, homogeneous sets of data, and larger, albeit non-homogeneous samples. Four different chemical elements are considered, namely, oxygen, sulphur, argon and neon.
arxiv  

Giant Rabi Splitting and Polariton Photoluminescence in an all Solution‐Deposited Dielectric Microcavity

Advanced Optical Materials, EarlyView.
Lowering the barrier for researchers to explore polariton physics: A fully solution‐processed dielectric polariton microcavity incorporating Rhodamine 6G with tunable Rabi splitting up to 400 meV and photoluminescence. Abstract Planar microcavity polaritons have recently emerged as a promising technology for improving several performance ...
Hassan A. Qureshi, Michael A. Papachatzakis, Ahmed Gaber Abdelmagid, Mikko Salomäki, Ermei Mäkilä, Oskar Tuomi, Olli Siltanen, Konstantinos S. Daskalakis   +7 more
wiley   +1 more source

Parameterized Two‐Qubit Gates for Enhanced Variational Quantum Eigensolver

Annalen der Physik, Volume 534, Issue 12, December 2022., 2022
The parameterized quantum circuit used in variational quantum algorithms usually consists of parameterized single‐qubit gates and fixed entangling multi‐qubit gates. Here, it is considered what happens when the entangling gates become parameterized, which allows for directly tuning the entangling power of the circuit. The parameterized entangling gates
Stig Elkjær Rasmussen, Nikolaj Thomas Zinner   +1 more
wiley   +1 more source

Suzaku observation of the Phoenix Galaxy

, 2009
In recent years, several Seyfert 2 galaxies have been discovered that change state when observed in X-rays a few years apart, switching from Compton-thin to reflection-dominated or viceversa. We observed a member of this class of "Changing-look" sources,
A. Comastri, Anders, Anders, Awaki, Baluinska-Church, Bianchi, E. Jimenez-Bailon, F. Nicastro, G. Matt, Ghisellini, Gilli, Guainazzi, Guainazzi, Guainazzi, Guainazzi, Guainazzi, H. Awaki, K. Iwasawa, Koyama, Lamastra, M. Guainazzi, Matt, Matt, Matt, Matt, Molendi, Piconcelli, S. Bianchi, Sunyaev, Watanabe   +29 more
core   +1 more source

The effects of flattening and rotation on the temperature of the X-ray halos of elliptical galaxies [PDF]

arXiv, 2013
Elliptical galaxies have hot coronae with X-ray luminosities and mean gas temperatures that span over wide ranges. This variation can be partially due to the energy budget of the hot gas, that depends on the host galaxy structure and internal kinematics.
arxiv