Results 121 to 130 of about 63,914 (268)

The X-ray luminosity function of active galactic nuclei in the redshift interval z=3-5 [PDF]

, 2015
We combine deep X-ray survey data from the Chandra observatory and the wide-area/shallow XMM-XXL field to estimate the AGN X-ray luminosity function in the redshift range z=3-5.
A. Georgakakis, J. Aird, J. Buchner, M. Salvato, M. Menzel, W. Brandt, I. McGreer, T. Dwelly, G. Mountrichas, C. Koki, I. Georgantopoulos, L. Hsu, A. Merloni, Z. Liu, K. Nandra, N. Ross, N. Ross   +16 more
semanticscholar   +1 more source

Influence of radiotherapy dose rate on gold nanoparticle‐induced radiosensitization from high dose‐rate brachytherapy and external beam therapy

Medical Physics, Volume 53, Issue 3, March 2026.
Abstract Background Associated normal tissue toxicity from current radiotherapy (RT) treatments limits effective dose escalation in the tumor to achieve nominal treatment results. Gold nanoparticles (GNPs) as radiosensitizing agents to locally increase photoelectron production have gained interest as a safe and viable method to improve therapeutic ...
Daniel Cecchi, Nolan Jackson, Sacha Freeman, Kieren O'Neil, Mehran Goharian, Wayne Beckham, Devika B. Chithrani   +6 more
wiley   +1 more source

Test for Echo: X-Ray Reflection Variability in the Seyfert-2 Active Galactic Nucleus NGC 4388

The Astrophysical Journal
We report on a study of the narrow Fe K α line and reflection spectrum in the well-known Seyfert-2 active galactic nucleus (AGN), NGC 4388. X-ray spectra summed from two extensive NICER monitoring campaigns, separated by years, show strong evidence of ...
Ben Gediman, Jon M. Miller, Abderahmen Zoghbi, Paul Draghis, Zaven Arzoumanian, W. N. Brandt, Keith Gendreau   +6 more
doaj   +1 more source

A systematic cross-search for radio/infrared counterparts of XMM-Newton sources

, 2010
We present a catalog of cross-correlated radio, infrared and X-ray sources using a very restrictive selection criteria with an IDL-based code developed by us.
A. Caccianiga, A. J. Muñoz-Arjonilla, A.D.P. Hands, A.J. Green, B.J. Boyle, C. Feruglio, E. Sánchez-Ayaso, F.J. Carrera, G. E. Romero, G. Fabbiano, G. Micela, G. Novara, I. Furenlid, J. A. Combi, J. Ebrero, J. F. Albacete Colombo, J. López-Santiago, J. López-Santiago, J. Martí, J. R. Sánchez-Sutil, J.J. Condon, J.R. Allington-Smith, L. Pellizza, M. Seldner, M.G. Watson, P. L. Luque-Escamilla, P. Severgnini, P.J.E. Peebles, P.M. Woodward, R. Della Ceca, R. Della Ceca, R.K. Smith, S. Mateos, S. Mateos, X. Barcons, X. Barcons   +35 more
core   +1 more source

Deep Extragalactic X-ray Surveys [PDF]

, 2005
Deep surveys of the cosmic X-ray background are reviewed in the context of observational progress enabled by the Chandra X-ray Observatory and the X-ray Multi-Mirror Mission-Newton.
Brandt WN, Brandt WN, Comastri A, Comastri A, Ferrarese L, G. Hasinger, Hasinger G, Hasinger G, Hasinger G, Mainieri V, Miyaji T, Osmer PS, Schmidt M, W.N. Brandt, Zamorani G   +14 more
core   +1 more source

Intrinsic disc emission and the soft X‐ray excess in active galactic nuclei [PDF]

, 2011
Narrow-line Seyfert 1 (NLS1) galaxies have low-mass black holes and mass accretion rates close to (or exceeding) Eddington, so a standard blackbody accretion disc should peak in the extreme ultraviolet. However, the lack of true absorption opacity in the
C. Done, S. Davis, C. Jin, O. Blaes, M. Ward   +4 more
semanticscholar   +1 more source

A Thermodynamic Framework for Turing‐Type Instabilities in Porous Media: Part II Applications

Geochemistry, Geophysics, Geosystems, Volume 27, Issue 3, March 2026.
Abstract Compaction bands, desiccation cracks, and melt segregation structures are geological patterns relying on the same fundamental manifestations of a universal Turing‐type instability mechanism, as predicted by the thermodynamically consistent reaction–cross‐diffusion framework developed in Part I (Regenauer‐Lieb et al., 2025, https://doi.org/10 ...
Klaus Regenauer‐Lieb, Manman Hu, Qingpei Sun, Chong Liu, Zhennan Zhu, Victor Calo   +5 more
wiley   +1 more source

X-ray emission from active galactic nuclei [PDF]

It is often held that the X-ray emission from active galactic nuclei (AGN) arises from a region close to the central energy source. Thus X-ray observations may provide the best constraints on the central engine.
Mushotzky, R.
core   +1 more source

INTEGRAL/IBIS 7-year All-Sky Hard X-Ray Survey. Part II: Catalog of Sources

, 2010
This paper is the second in a series devoted to the hard X-ray (17-60 keV) whole sky survey performed by the INTEGRAL observatory over seven years. Here we present a catalog of detected sources which includes 521 objects, 449 of which exceed a 5 sigma ...
Abdo, Ajello, Aleksandrovich, Altamirano, Augello, Barlow, Barlow, Barthelmy, Bassa, Bassani, Bassani, Bassani, Bassani, Bazzano, Beckmann, Beckmann, Bikmaev, Bikmaev, Bikmaev, Bikmaev, Bird, Bird, Bird, Bird, Bodaghee, Brandt, Brandt, Brandt, Brandt, Brunschweiger, Burenin, Burenin, Burenin, Burenin, Burenin, Butler, Butters, Bykov, Bykov, Bélanger, Cackett, Cadol le Bel, Chaty, Chelovekov, Chelovekov, Chelovekov, Chelovekov, Chernyakova, Chernyakova, Chernyakova, Cornelisse, Courvoisier, Crawford, Cusumano, Dean, Den Hartog, den Hartog, den Hartog, Donato, E. Churazov, Enya, Fiocchi, Fisher, Galloway, Gehrels, Gotz, Grebenev, Grebenev, Grebenev, Grebenev, Grebenev, Grebenev, Grebenev, Grebenev, Grebenev, Grebenev, Grebenev, Grebenev, Grebenev, Grebenev, Grebenev, Gros, Gänsicke, Halpern, Hannikainen, Im, in ’t Zand, in ’t Zand, Jauncey, Karasev, Karasev, Keek, Kniazev, Kniazev, Kretschmar, Krivonos, Krivonos, Krivonos, Krivonos, Krivonos, Krivonos, Kuiper, Kuiper, Kuiper, Kuiper, Kuulkers, Kuulkers, Landi, Landi, Landi, Landi, Leyder, Liu, Liu, Lubinski, Lutovinov, Lutovinov, Lutovinov, Lutovinov, Lutovinov, Lutovinov, Lutovinov, Lutovinov, Lutovinov, Lutovinov, Lutovinov, M. Revnivtsev, Malizia, Malizia, Markwardt, Markwardt, Masetti, Masetti, Masetti, Masetti, Masetti, Masetti, Masetti, Masetti, Masetti, Masetti, Masetti, Masetti, Masetti, Masetti, Masetti, Mescheryakov, Molkov, Molkov, Molkov, Morelli, Negueruela, Negueruela, Nespoli, Paizis, Palmer, Parisi, Patel, Pavlinskii, Potter, Produit, R. Krivonos, R. Sunyaev, Ratti, Rea, Reig, Reig, Renaud, Revnivtsev, Revnivtsev, Revnivtsev, Revnivtsev, Revnivtsev, Revnivtsev, Revnivtsev, Revnivtsev, Revnivtsev, Revnivtsev, Rodriguez, Rodriguez, Rodriguez, Rodriguez, Rodriguez, S. Grebenev, S. Tsygankov, Sazonov, Sazonov, Sazonov, Sguera, Sguera, Sidoli, Smith, Soldi, Soldi, Steeghs, Sunyaev, Sunyaev, Sunyaev, Terrier, Tomsick, Tomsick, Tomsick, Tomsick, Tomsick, Tomsick, Torrejón, Torres, Torres, Tueller, Tueller, Turler, Ubertini, Ubertini, Walter, Walter, Watson, Wijnands, Winkler, Winter, Zhou, Zurita Heras   +220 more
core   +1 more source

Controls on Iron‐Redox State in Martian Magmas Quantified by Mössbauer Spectroscopy, Colorimetric Wet Chemistry, and XANES Spectroscopy

Journal of Geophysical Research: Planets, Volume 131, Issue 3, March 2026.
Abstract To elucidate the relationship between oxygen fugacities (fO2) recorded in martian basalts and redox processes in the martian interior, superliquidus 100‐kPa furnace experiments on a composition similar to Humphrey (Adirondack basalt) were conducted at variable fO2 and temperature. Quenched glasses were analyzed by EPMA, Mössbauer spectroscopy,
S. P. Aithala, R. A. Lange, M. M. Hirschmann   +2 more
wiley   +1 more source