Zobrazeno 1 - 10
of 36
pro vyhledávání: '"Demos Kazanas"'
Publikováno v:
Nuclear Physics B, Vol 890, Iss , Pp 17-29 (2015)
The hypothetical massive dark photon (γ′) which has kinetic mixing with the SM photon can decay electromagnetically to e+e− pairs if its mass m exceeds 2me, and otherwise into three SM photons. These decays yield cosmological and supernovae asso
Externí odkaz:
https://doaj.org/article/9789f357b1774a359b9783dc32c3fc06
Publikováno v:
Advances in Astronomy, Vol 2015 (2015)
The difference of photon arrival time, which is known as spectral lag, is well known characteristics of gamma-ray bursts (GRBs). In particular, long duration GRBs show a soft lag which means that high energy photons arrive earlier than soft photons.
Externí odkaz:
https://doaj.org/article/29f6a56faa874175bfe7513db5328044
We investigate long Gamma-Ray Bursts (GRB) which manifest a sharp linear rise followed by an exponential decay in their gamma-ray prompt emission observed with the BAT instrument on board the Swift satellite. We offer a simple electrodynamic model th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::db679677c2b9ca6dd1c3044c4b48844d
Publikováno v:
Mon Not R Astron Soc Lett
Observations of X-ray absorption lines in magnetically driven disk winds around black hole binaries and active galactic nuclei yield a universal radial density profile rho proportional to r^{-1.2} in the wind. This is in disagreement with the standar
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c118bd5cc7e80d25e8c8db149c4b9d9e
https://pubmed.ncbi.nlm.nih.gov/32440307
https://pubmed.ncbi.nlm.nih.gov/32440307
Autor:
Timothy R. Kallman, Arkaprabha Sarangi, Ori D. Fox, Richard G. Arendt, Eli Dwek, Demos Kazanas
Publikováno v:
The Astrophysical Journal. 917:84
SN 2010jl is a Type IIn core collapse supernova whose radiative output is powered by the interaction of the SN shock wave with its surrounding dense circumstellar medium (CSM). After day ~60, its light curve developed a NIR excess emission from dust.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::52006551e70fd7d340abaf62d07eb669
https://doi.org/10.3847/1538-4357/ac09ea
https://doi.org/10.3847/1538-4357/ac09ea
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 473:721-727
We implement the KORAL code to perform two sets of very long general relativistic radiation magnetohydrodynamic simulations of an axisymmetric optically thin magnetized flow around a non-rotating black hole: one with a new term in the electromagnetic
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::483c25ea6ffce31e4d6428c321cb00b2
https://doi.org/10.1093/mnras/stx2249
https://doi.org/10.1093/mnras/stx2249
Publikováno v:
Mon Not R Astron Soc Lett
We have compiled a comprehensive library of all X-ray observations of Magellanic pulsars carried out by XMM-Newton, Chandra, and RXTE in the period 1997–2014. In this work, we use the data from 53 high-mass Be/X-ray binaries in the Small Magellanic
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5ff2b8825461f37e7aa4f1d8c27f3ecf
https://doi.org/10.1093/mnrasl/slx058
https://doi.org/10.1093/mnrasl/slx058
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 462:565-575
This is our first study of the magnetic Rayleigh-Taylor instability at the inner edge of an astrophysical disc around a central back hole. We derive the equations governing small-amplitude oscillations in general relativistic ideal magnetodydrodynami
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::76268300242d2843fa46707763121af7
https://doi.org/10.1093/mnras/stw1565
https://doi.org/10.1093/mnras/stw1565
Autor:
Demos Kazanas, Ioannis Contopoulos, K. Fukumura, Ehud Behar, Francesco Tombesi, Chris Shrader
Publikováno v:
Astronomische Nachrichten. 337:454-458
We investigate the physics of the X-ray ionized absorbers often identified as warm absorbers (WAs) and ultra-fast outflows (UFOs) in Seyfert AGNs from spectroscopic studies in the context of magnetically-driven accretion-disk wind scenario. Launched
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::eb8364f5adeaf09742b474d32404d4d8
https://doi.org/10.1002/asna.201612329
https://doi.org/10.1002/asna.201612329
Autor:
Demos Kazanas, Luca Zappacosta, Fabrizio Nicastro, Francesco Tombesi, K. Fukumura, Fabrizio Fiore, A. Luminari, Enrico Piconcelli
Publikováno v:
Astronomy & Astrophysics. 633:A55
Outflows are observed in a variety of astrophysical sources. Remarkably, ultra-fast ($v\geq 0.1c$), outflows in the UV and X-ray bands are often seen in AGNs. Depending on their energy and mass outflow rate, respectively $\dot{E}_{out}, \dot{M}_{out}
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2a38e64840802ae7d4567480bfe65e96
https://doi.org/10.1051/0004-6361/201936797
https://doi.org/10.1051/0004-6361/201936797