Zobrazeno 1 - 10
of 211
pro vyhledávání: '"P. Tzanavaris"'
The gravitational capture of a stellar-mass object by a supermassive black hole represents a unique probe of warped spacetime. The small object, typically a stellar-mass black hole, describes a very large number of cycles before crossing the event ho
Externí odkaz:
http://arxiv.org/abs/2403.12134
Narrow Fe K$\alpha$ fluorescent emission lines arising at $\sim$kpc-scale separations from the nucleus have only been detected in a few AGN. The detections require that the extended line emission be spatially resolved and sufficiently bright. Compare
Externí odkaz:
http://arxiv.org/abs/2312.00124
Autor:
Garofali, Kristen, Basu-Zych, Antara R., Johnson, Benjamin D., Tzanavaris, Panayiotis, Jaskot, Anne, Richardson, Chris T., Lehmer, Bret D., Yukita, Mihoko, Hodges-Kluck, Edmund, Hornschemeier, Ann, Ptak, Andrew, Vulic, Neven
We present a methodology for modeling the joint ionizing impact due to a "simple X-ray population" (SXP) and its corresponding simple stellar population (SSP), where "simple" refers to a single age and metallicity population. We construct composite s
Externí odkaz:
http://arxiv.org/abs/2307.00050
We present a new analysis of the Suzaku X-ray spectrum of the Compton-thin Seyfert 2 galaxy NGC 4388. The spectrum above $\sim$2 keV can be described by a remarkably simple and rather mundane model, consisting of a uniform, neutral spherical distribu
Externí odkaz:
http://arxiv.org/abs/2303.09577
Autor:
LaMassa, Stephanie M., Yaqoob, Tahir, Tzanavaris, Panayiotis, Gandhi, Poshak, Heckman, Timothy, Lansbury, George, Siemiginowska, Aneta
3C 223 is a radio loud, Type 2 quasar at $z=0.1365$ with an intriguing XMM-Newton spectrum that implicated it as a rare, Compton-thick ($N_{\rm H} \gtrsim 1.25 \times 10^{24}$ cm$^{-2}$) active galactic nucleus (AGN). We obtained contemporaneous XMM-
Externí odkaz:
http://arxiv.org/abs/2301.07193
We select eight nearby AGNs which, based on previous work, appear to be Compton-thin in the line of sight. We model with MYTORUS their broadband X-ray spectra from 20 individual observations with $Suzaku$, accounting self-consistently for Fe K$\alpha
Externí odkaz:
http://arxiv.org/abs/2108.11971
Autor:
Stefanos Nikiforos, Eleftheria Anastasopoulou, Athina Pappa, Spyros Tzanavaris, Katia Lida Kermanidis
Publikováno v:
Computers, Vol 13, Iss 7, p 177 (2024)
The onset of the COVID-19 pandemic prompted a rapid shift to Emergency Remote Teaching (ERT). Social networks had a key role in supporting the educational community in facing challenges and opportunities. A quantitative study was conducted to assess
Externí odkaz:
https://doaj.org/article/8fead6f93b744be5a599551dded4e6d8
Autor:
Tzanavaris, Kostas, Seoane, Pau Amaro
In the context of mathematical cosmology, the study of necessary and sufficient conditions for a semi-Riemannian manifold to be a (generalised) Robertson-Walker space-time is important. In particular, it is a requirement for the development of initia
Externí odkaz:
http://arxiv.org/abs/2010.07306
Autor:
Lehmer, Bret D., Ferrell, Andrew P., Doore, Keith, Eufrasio, Rafael T., Monson, Erik B., Alexander, David M., Basu-Zych, Antara, Brandt, William N., Sivakoff, Greg, Tzanavaris, Panayiotis, Yukita, Mihoko, Fragos, Tassos, Ptak, Andrew
We investigate X-ray binary (XRB) luminosity function (XLF) scaling relations for Chandra detected populations of low-mass XRBs (LMXBs) within the footprints of 24 early-type galaxies. Our sample includes Chandra and HST observed galaxies at D < 25 M
Externí odkaz:
http://arxiv.org/abs/2004.13045
Autor:
LaMassa, Stephanie M., Yaqoob, Tahir, Boorman, Peter G., Tzanavaris, Panayiotis, Levenson, N. A., Gandhi, Poshak, Ptak, Andrew F., Heckman, Timothy M.
We present the analysis of Chandra and NuSTAR spectra of NGC 4968, a local (D$\sim$44 Mpc) 12$\mu$m-selected Seyfert 2 galaxy, enshrouded within Compton-thick layers of obscuring gas. We find no evidence of variability between the Chandra and NuSTAR
Externí odkaz:
http://arxiv.org/abs/1911.05813