Results 31 to 40 of about 6,902 (68)

Black hole lightning due to particle acceleration at subhorizon scales [PDF]

Science, 2014
Supermassive black holes with masses of millions to billions of solar masses are commonly found in the centers of galaxies. Astronomers seek to image jet formation using radio interferometry but still suffer from insufficient angular resolution.
M. C. J. Aleksi'c, S. Ansoldi, L. A. Antonelli, P. Antoranz, A. Babić, P. Bangale, J. Barrio, J. González, W. Bednarek, E. Bernardini, B. Biasuzzi, A. Biland, O. Blanch, S. Bonnefoy, G. Bonnoli, F. Borracci, T. Bretz, E. Carmona, A. Carosi, P. Colin, E. Colombo, J. Contreras, J. Cortina, S. Covino, P. D. Vela, F. Dazzi, A. Angelis, G. Caneva, B. Lotto, E. O. Wilhelmi, C. Mendez, D. Prester, D. Dorner, M. Doro, S. Einecke, D. Eisenacher, D. Elsaesser, M. Fonseca, L. Font, K. Frantzen, C. Fruck, D. Galindo, R. G. López, M. Garczarczyk, D. G. Terrats, M. Gaug, N. Godinovic, A. G. Muñoz, S. Gozzini, D. Hadasch, Y. Hanabata, M. Hayashida, J. Herrera, D. Hildebrand, J. Hose, D. Hrupec, W. Idec, V. Kadenius, H. Kellermann, K. Kodani, Y. Konno, J. Krause, H. Kubo, J. Kushida, A. Barbera, D. Lelas, N. Lewandowska, E. Lindfors, S. Lombardi, F. Longo, M. Lopez, R. López-Coto, A. López-Oramas, E. Lorenz, I. Lozano, M. Makariev, K. Mallot, G. Maneva, N. Mankuzhiyil, K. Mannheim, L. Maraschi, B. Marcote, M. Mariotti, M. Martínez, D. Mazin, U. Menzel, J. Miranda, R. Mirzoyan, A. Moralejo, P. Munar-Adrover, D. Nakajima, A. Niedźwiecki, K. Nilsson, K. Nishijima, K. Noda, R. Orito, A. Overkemping, S. Paiano, M. Palatiello, D. Paneque, R. Paoletti, J. Paredes, X. Paredes-Fortuny, M. Persic, J. Poutanen, P. Moroni, E. Prandini, I. Puljak, R. Reinthal, W. Rhode, M. Ribó, J. Rico, J. Garcia, S. Rugamer, T. Saito, K. Saito, K. Satalecka, V. Scalzotto, V. Scapin, C. Schultz, T. Schweizer, S. Shore, A. Sillanpaa, J. Sitarek, I. Šnidarić, D. Sobczynska, F. Spanier, V. Stamatescu, A. Stamerra, T. Steinbring, J. Storz, M. Strzys, L. Takalo, H. Takami, F. Tavecchio, P. Temnikov, T. Terzić, D. Tescaro, M. Teshima, J. Thaele, O. Tibolla, D. Torres, T. Toyama, A. Treves, M. Uellenbeck, P. Vogler, R. Zanin, M. Kadler, R. Schulz, E. Ros, U. Bach, F. Krauß, J. Wilms, Ifae, Campus Uab, E-08193 Bellaterra, Spain., U. Udine, I. Trieste, I. Udine, Italy, I. I. F. Astrophysics, I-00136 Rome, U. Siena, I. Pisa, I-53100 Siena, Croatian Magic Consortium, Rudjer Boskovic Institute, University of Rijeka, University of Split, HR-10000 Zagreb, Croatia., M. F. Physik, D-80805 Munchen, H Germany, U. Complutense, E. Madrid, Spain Inst. de Astrof'isica de Canarias, E-38200 La Laguna, Tenerife, University of L'od'z, PL-90236 Lodz, Poland., D. Elektronen-Synchrotron, D. Zeuthen, E. Zurich, CH-8093 Zurich, Switzerland., U. Wurzburg, D-97074 Wurzburg, Centro de Investigaciones Energ'eticas, Medioambientales y Tecnol'ogicas, Institute for Space Sciences, E. Barcelona, U. Padova, Infn, I-35131 Padova, Technische Universitat Dortmund, D. Dortmund, Unitat de F'isica de les Radiacions, Departament de F'isica, CERES-IEEC, U. Barcelona, U. Barcelona, Icc, IEEC-UB, E. Barcelona, Japanese Magic Consortium, D. Physics, Astronomy, Kyoto University, Japan., Finnish Magic Consortium, T. Observatory, U. Turku, D. Physics, U. Oulu, Finland., Inst. for Nucl. Research, Nucl. Energy, BG-1784 Sofia, Bulgaria., U. Pisa, I. Pisa, Icrea, U. dell'Insubria, I. M. Bicocca, Como, I-22100 Como, now at Nasa Goddard Space Flight Center, Greenbelt, MD 20771, Usa, D. O. Astronomy, U. Maryland, College Park, MD 20742, N. C. E. P. F. D. Lausanne, Lausanne, Now at Institut fur Astro- und Teilchenphysik, L. Innsbruck, A. Innsbruck, Austria, N. Eso, Turku, N. Division, Bhabha Atomic Research Centre, Mumbai 400085, India., also at INAF-Trieste, now at School of ChemistryPhysics, U. Adelaide, Adelaide 5005, Australia., Dr. Remeis-Sternwarte Bamberg, Astronomisches Institut der Universitat Erlangen-Nurnberg, Ecap, D-96049 Bamberg, Max Planck Institut fur Radioastronomie, D. Bonn, German, Observatori Astronòmic, U. Valencia, E. Paterna, Valencia, D. D. I. Astrof'isica, E-46100 Burjassot   +266 more
semanticscholar   +1 more source

Accretion disk winds in active galactic nuclei: X-ray observations, models, and feedback [PDF]

, 2015
Powerful winds driven by active galactic nuclei (AGN) are often invoked to play a fundamental role in the evolution of both supermassive black holes (SMBHs) and their host galaxies, quenching star formation and explaining the tight SMBH-galaxy relations.
Francesco Tombesi X-ray Astrophysics Laboratory, NASAGoddard Space Flight Center Department of Astronomy, U. Maryland, Cresst   +3 more
semanticscholar   +1 more source

On galaxy rotation curves from a continuum mechanics approach to modified gravity [PDF]

, 2017
We consider a modification of General Relativity motivated by the treatment of anisotropies in Continuum Mechanics. The Newtonian limit of the theory is formulated and applied to galactic rotation curves.
Boehmer, Christian G., Tamanini, Nicola, Wright, Matthew   +2 more
core   +4 more sources

A precise and accurate determination of the cosmic microwave background temperature at z = 0.89 [PDF]

, 2012
Context. According to the Big Bang theory and as a consequence of adiabatic expansion of the Universe, the temperature of the cosmic microwave background (CMB) increases linearly with redshift. This relation is, however, poorly explored, and detection of
S. Muller, A. Beelen, J. Black, S. Curran, C. Horellou, S. Aalto, F. Combes, M. Guélin, C. O. Earth, S. Sciences, C. U. Technology, O. Observatory, Onsala, Sweden Institut d'Astrophysique Spatiale, U. Paris-sud, Orsay Cédex, France Niels Bohr Institute for Astronomy, S. O. Physics, The University of Sydney, Australia Arc Centre of Excellence for All-sky Astrophysics Paris, Lerma, Cnrs, París, France Institut de Radioastronomie Millim'etrique, S. d’Hères, France Ecole Normale Sup'erieureLERMA, France Max-Planck-Institut fur Radioastonomie, Bonn, Germany Astron. Dept., King Abdulaziz University, Jeddah, S. Arabia   +31 more
semanticscholar   +1 more source

Diffuse low-ionization gas in the galactic halo casts doubts on z ≃ 0.03 WHIM detections [PDF]

, 2016
In this Letter we demonstrate that the two claims of $z\simeq 0.03$ OVII K$\alpha$ absorption lines from Warm Hot Intergalactic Medium (WHIM) along the lines of sight to the blazars H~2356-309 (Buote et al., 2009; Fang et al., 2010) and Mkn~501 (Ren ...
F. Nicastro, F. Senatore, A. Gupta, S. Mathur, Y. Krongold, M. Elvis, L. P. O. A. D. R. -. Inaf, Roma, Italy., H. C. F. Astrophysics, Cambridge, Ma, Usa, U. Crete, Heraklion, Greece., O. University, Columbus, Oh, Columbus State Community College, Center for Particle Cosmology, Astro-particle Physics, T. O. S. University, I. D. Astronomía, Universidad Autonoma de Mexico, M'exico City, Mexico., I. D. A. E. P. S. -. Inaf   +27 more
semanticscholar   +1 more source

Self-Interacting Dark Matter Subhalos in the Milky Way's Tides

, 2020
We study evolution of self-interacting dark matter (SIDM) subhalos in the Milky Way (MW) tidal field. The interaction between the subhalos and the MW's tides lead to more diverse dark matter distribution in the inner region, compared to their cold dark ...
Sales, Laura V., Sameie, Omid, Vogelsberger, Mark, Yu, Hai-Bo, Zavala, Jesus   +4 more
core   +1 more source

New Limits on the Dark Matter Lifetime from Dwarf Spheroidal Galaxies using Fermi-LAT [PDF]

, 2016
Dwarf spheroidal galaxies (dSphs) are promising targets for the indirect detection of dark matter through gamma-ray emission due to their proximity, lack of astrophysical backgrounds and high dark matter density.
Baring, Matthew G., Ghosh, Tathagata, Queiroz, Farinaldo S., Sinha, Kuver   +3 more
core   +4 more sources

NuSTAR Tests of Sterile-Neutrino Dark Matter: New Galactic Bulge Observations and Combined Impact

, 2020
We analyze two dedicated NuSTAR observations with exposure ${\sim}190$ ks located ${\sim}10^\circ$ from the Galactic plane, one above and the other below, to search for x-ray lines from the radiative decay of sterile-neutrino dark matter.
Beacom, John F., Horiuchi, Shunsaku, Krivonos, Roman, Ng, Kenny C. Y., Perez, Kerstin, Roach, Brandon M., Wik, Daniel R.   +6 more
core   +1 more source

Applications of Stellar Population Synthesis in the Distant Universe

, 2020
Comparison with artificial galaxy models is essential for translating the incomplete and low signal-to-noise data we can obtain on astrophysical stellar populations to physical interpretations which describe their composition, physical properties ...
Stanway, Elizabeth R.
core   +1 more source

Massive and supermassive black holes in the contemporary and early universe and the new problems of cosmology and astrophysics

, 2017
This is the translation into English of the introduction, conclusion, and the list of references of the review on massive primordial black holes, which is submitted in Russian to Uspekhi Fizicheskikh Nauk (Physics-Uspekhi).
Dolgov, A. D.
core   +1 more source