Results 71 to 80 of about 4,303,458 (400)

Gamma-Ray Cosmology and Tests of Fundamental Physics

Galaxies, 2022
The propagation of gamma-rays over cosmological distances is the subject of extensive theoretical and observational research at GeV and TeV energies. The mean free path of gamma-rays in the cosmic web is limited above 100 GeV due to the production of ...
Jonathan Biteau, Manuel Meyer
doaj   +1 more source

Infrared identification of hard X-ray sources in the Galaxy [PDF]

Monthly Notices of the Royal Astronomical Society, 2015
The nature of the low- to intermediate-luminosity (Lx$\,\sim 10^{32-34}$ erg s$^{-1}$) source population revealed in hard band (2-10 keV) X-ray surveys of the Galactic Plane is poorly understood. To overcome such problem we cross-correlated the XMM-Newton 3XMM-DR4 survey with the infrared 2MASS and GLIMPSE catalogues.
A. Nebot Gómez-Morán, C. Motch, F.-X. Pineau, F. J. Carrera, M. W. Pakull, F. Riddick   +5 more
openaire   +3 more sources

Bright Coherent Ultrahigh Harmonics in the keV X-ray Regime from Mid-Infrared Femtosecond Lasers [PDF]

Science, 2012
From Long to Short When you play a string instrument, you raise the frequency, or pitch, of the note by shortening the vibrating portion of the string: Drop the length in half, and you hear a harmonic at double the frequency.
T. Popmintchev, Ming-Chang Chen, D. Popmintchev, P. Arpin, S. Brown, S. Alisauskas, G. Andriukaitis, T. Balciunas, O. Mücke, A. Pugžlys, A. Baltuska, B. Shim, S. Schrauth, A. Gaeta, C. Hernández-García, L. Plaja, A. Becker, A. Jaroń-Becker, M. Murnane, H. Kapteyn   +19 more
semanticscholar   +1 more source

Log file‐based quality assurance method for respiratory gating system

Journal of Applied Clinical Medical Physics, EarlyView.
Abstract Background As medical linear accelerator technology advances, enabling higher dose rate deliveries, hypofractionation regimens has increased. This necessitates respiratory gating systems that synchronize radiation delivery with tumor position, requiring simple rigorous quality assurance (QA) to ensure treatment accuracy and patient safety ...
Wonjoong Cheon, Young Kyu Lee, Yunji Seol, Chan‐beom Park, Hong Qi Tan, Kyu Hye Choi, Young‐nam Kang, Byung Ock Choi   +7 more
wiley   +1 more source

Near-infrared observations of PSR J1357-6429

, 2015
PSR J1357$-$6429 is a young radio pulsar that was detected in X-rays and $\gamma$-rays. We present the high spatial resolution near-infrared imaging of the pulsar field in $J$, $H$ and $K_s$ bands obtained with the VLT/NaCo using the Adaptive Optic ...
Danilenko, A., Kirichenko, A., Mennickent, R. E., Shibanov, Yu., Zharikov, S., Zyuzin, D.   +5 more
core   +1 more source

The location of an active nucleus and a shadow of a tidal tail in the ULIRG Mrk 273 [PDF]

, 2011
Analysis of data from the Chandra X-ray Observatory for the double nucleus ULIRG Mrk 273 reveals an absorbed hard X-ray source coincident with the southwest nucleus, implying that this unresolved, near-infrared source is where an active nucleus resides ...
Armus, L., Evans, A. S., Howell, J. H., Iwasawa, K., Komossa, S., Mazzarella, J. M., Petric, A., Sanders, D. B., Surace, J. A., Teng, S. H., U, V., Veilleux, S.   +11 more
core   +2 more sources

Subdiffractional focusing and guiding of polaritonic rays in a natural hyperbolic material [PDF]

Nature Communications, 2015
Uniaxial materials whose axial and tangential permittivities have opposite signs are referred to as indefinite or hyperbolic media. In such materials, light propagation is unusual leading to novel and often non-intuitive optical phenomena. Here we report
S. Dai, Qiong Ma, T. Andersen, A. Mcleod, Z. Fei, Mengkun Liu, Mengkun Liu, M. Wagner, K. Watanabe, T. Taniguchi, M. Thiemens, F. Keilmann, P. Jarillo-Herrero, M. Fogler, D. Basov   +14 more
semanticscholar   +1 more source

Infrared-Selected “Warm” Galaxies Observed in X-rays [PDF]

Symposium - International Astronomical Union, 1989
The Infrared Astronomical Satellite (IRAS) has detected many galaxies in the infrared (IR), most of which have fairly steep 25μ to 60μ spectra. Many quasars and active galaxies exhibit a significantly flatter spectrum in the infrared. Several studies, for example, DeGrijp et al.
Green, P.J., Ward, M., Anderson, S.F., Margon, B., Grijp, M.H.K. de, Miley, G.K.   +5 more
openaire   +5 more sources

The Regulation of Trace Metal Elements in Cancer Ferroptosis

Advanced Biology, EarlyView.
The induction of ferroptosis inhibits tumor growth, enhances anticancer efficacy, and overcomes drug resistance. Recent evidence shows nonferrous metal elements play a role in ferroptosis. This review focuses on how trace metals regulate ferroptosis processes like iron accumulation, lipid peroxidation, and antioxidant defense.
Xiaoyan Wang, Yuanyuan Xue, Lei Chang, Xuena Zhu, Wenjun Liu, Tingbo Liang   +5 more
wiley   +1 more source

Interpreting the relation between the gamma-ray and infrared luminosities of star-forming galaxies [PDF]

, 2019
It has been found that there is a quasi-linear scaling relationship between the gamma-ray luminosity in GeV energies and the total infrared luminosity of star-forming galaxies, i.e. $L_{\gamma}\propto L_{\rm IR}^{\alpha}$ with $\alpha\simeq 1$. However, the origin of this linear slope is not well understood.
arxiv   +1 more source