Results 91 to 100 of about 2,330,942 (208)

Landscape of Coronal X-Ray Variability and Cycles

The Astronomical Journal
Coronal (1–10 MK) X-rays display dramatic variability over the Sun’s iconic 11 yr magnetic dynamo cycle: already a factor of 4 in the soft 0.1–2.4 keV “ROSAT band,” soaring to more than 100 at harder energies (>10 keV).
Thomas Ayres
doaj   +1 more source

Chandra X-Ray Observatory (CXO):Overview

, 2000
11 pages, 23 figures, SPIE 4012, paper ...
Weisskopf, M. C., Tananbaum, H. D., Van Speybroeck, L. P., O'Dell, S. L.   +3 more
openaire   +2 more sources

Early results from the Chandra X-ray observatory [PDF]

New Astronomy Reviews, 2000
We present some early results on AGN from the Chandra X-ray Observatory, highlighting high resolution spectroscopy using the High Energy Transmission Grating Spectrometer (HETGS). The quasar PKS 0637-752 was found to have a very bright X-ray jet whose shape is remarkably similar to that of the radio jet on a size scale of 100 kpc, but the X-ray ...
openaire   +2 more sources

V2282 Sgr Revisited

Acta Polytechnica CTU Proceedings, 2014
The nature of V2282 Sgr is examined on the basis of several multiband observations: a 20 years long I-band light curve of V2282 Sgr obtained from archive photographic plates of the Asiago and Catania Observatories; a CCD R-band light curve obtained at ...
Roberto Nesci, Corinne Rossi, Antonio Frasca, Ettore Marilli, Paolo Persi, Nicola Cornero   +5 more
doaj   +1 more source

Unfolding X-Ray Spectral Data: Conditions and Applications

The Astronomical Journal
We present conditions for which X-ray spectra can be “unfolded” to present an accurate representation of the true source spectra. The method we use to unfold the data is implemented in the Interactive Spectral Interpretation Software and distinguishes ...
Sean J. Gunderson, David P. Huenemoerder
doaj   +1 more source

Current results and future prospectives on the XMM–Newton Heritage project CHEX-MATE, and on the non-thermal pressure in galaxy clusters [PDF]

EPJ Web of Conferences
The Cluster HEritage project with XMM-Newton – Mass Assembly and Thermodynamics at the Endpoint of structure formation (CHEX-MATE) is a Multi-Year Heritage Programme to obtain X-ray observations of a minimally-biased, signal-to-noise-limited sample of ...
Ettori S.
doaj   +1 more source

Searching for Compact Obscured Nuclei in Compton-thick Active Galactic Nuclei

The Astrophysical Journal
Compact obscured nuclei (CONs) are heavily obscured infrared cores that have been found in local (ultra-)luminous infrared galaxies. They show bright emission from vibrationally excited rotational transitions of HCN, known as HCN-vib, and are thought to ...
Makoto A. Johnstone, George C. Privon, Loreto Barcos-Muñoz, A.S. Evans, S. Aalto, Lee Armus, Franz E. Bauer, L. Blecha, J. S. Gallagher, S. König, Claudio Ricci, Ezequiel Treister, Cosima Eibensteiner, Kimberly L. Emig, Kara N. Green, Devaky Kunneriath, Jaya Nagarajan-Swenson, Alejandro Saravia, Ilsang Yoon   +18 more
doaj   +1 more source

The high energy X-ray probe (HEX-P): constraining supermassive black hole growth with population spin measurements

Frontiers in Astronomy and Space Sciences
Constraining the primary growth channel of supermassive black holes (SMBHs) remains one the most actively debated questions in the context of cosmological structure formation. Owing to the expected connection between SMBH spin parameter evolution and the
J. M. Piotrowska, J. A. García, J. A. García, D. J. Walton, R. S. Beckmann, D. Stern, D. R. Ballantyne, D. R. Wilkins, S. Bianchi, P. G. Boorman, J. Buchner, C.-T. Chen, C.-T. Chen, P. Coppi, T. Dauser, A. C. Fabian, E. Kammoun, E. Kammoun, E. Kammoun, K. Madsen, L. Mallick, L. Mallick, L. Mallick, G. Matt, G. Matzeu, E. Nardini, A. Pizzetti, S. Puccetti, C. Ricci, C. Ricci, F. Tombesi, F. Tombesi, F. Tombesi, F. Tombesi, F. Tombesi, N. Torres-Albà, K.-W. Wong   +36 more
doaj   +1 more source

Constraints on Diffuse X-Ray Emission from the TeV Halo Candidate HESS J1813-126

The Astrophysical Journal
Extended regions of very high-energy γ -ray emission associated with middle-aged pulsars have been found by γ -ray observatories. These regions, called TeV halos or pulsar halos, are thought to be created when energetic electrons from a pulsar or pulsar ...
David Guevel, Kim L. Page, Kaya Mori, Amy Lien, Ke Fang   +4 more
doaj   +1 more source

Orbital Modulation of Gamma Rays up to 100 TeV from LS 5039

The Astrophysical Journal Letters
Gamma-ray binaries are luminous in gamma rays, composed of a compact object orbiting a massive companion star. The interaction between these two objects can drive relativistic outflows, either jets or winds, in which particles can be accelerated to ...
R. Alfaro, M. Araya, J. C. Arteaga-Velázquez, D. Avila Rojas, H. A. Ayala Solares, R. Babu, P. Bangale, E. Belmont-Moreno, A. Bernal, K. S. Caballero-Mora, T. Capistrán, A. Carramiñana, S. Casanova, U. Cotti, J. Cotzomi, S. Coutiño de León, D. Depaoli, P. Desiati, N. Di Lalla, R. Diaz Hernandez, B. L. Dingus, M. A. DuVernois, K. Engel, T. Ergin, C. Espinoza, K. L. Fan, K. Fang, J. A. García-González, H. Goksu, A. Gonzalez Muñoz, J. A. González, M. M. González, J. A. Goodman, S. Groetsch, J. P. Harding, S. Hernández-Cadena, I. Herzog, J. Hinton, D. Huang, F. Hueyotl-Zahuantitla, P. Hüntemeyer, S. Kaufmann, D. Kieda, A. Lara, J. Lee, H. León Vargas, J. T. Linnemann, A. L. Longinotti, G. Luis-Raya, K. Malone, O. Martinez, J. Martínez-Castro, J. A. Matthews, P. Miranda-Romagnoli, J. A. Morales-Soto, E. Moreno, M. Mostafá, M. Najafi, L. Nellen, M. U. Nisa, N. Omodei, E. Ponce, Y. Pérez Araujo, E. G. Pérez-Pérez, C. D. Rho, A. Rodriguez Parra, D. Rosa-González, M. Roth, H. Salazar, D. Salazar-Gallegos, A. Sandoval, M. Schneider, G. Schwefer, J. Serna-Franco, A. J. Smith, Y. Son, R. W. Springer, O. Tibolla, K. Tollefson, I. Torres, R. Torres-Escobedo, R. Turner, E. Varela, X. Wang, Z. Wang, I. J. Watson, H. Wu, S. Yu, S. Yun-Cárcamo, H. Zhou, C. de León, HAWC Collaboration   +91 more
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