no code implementations • 11 Jul 2019 • Christopher S. Reynolds, M. C. David Marsh, Helen R. Russell, Andrew C. Fabian, Robyn N. Smith, Francesco Tombesi, Sylvain Veilleux
We compute photon survival probabilities as a function of ALP mass $m_a$ and ALP-photon coupling constant $g_{a\gamma}$ for an ensemble of ICM magnetic field models, and then use the NGC1275 spectrum to constraint the $(m_a, g_{a\gamma})$-plane.
High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics High Energy Astrophysical Phenomena
1 code implementation • 1 Aug 2018 • Grant R. Tremblay, Françoise Combes, J. B. Raymond Oonk, Helen R. Russell, Michael A. McDonald, Massimo Gaspari, Bernd Husemann, Paul E. J. Nulsen, Brian R. McNamara, Stephen L. Hamer, Christopher P. O'Dea, Stefi A. Baum, Timothy A. Davis, Megan Donahue, G. Mark Voit, Alastair C. Edge, Elizabeth L. Blanton, Malcolm N. Bremer, Esra Bulbul, Tracy E. Clarke, Laurence P. David, Louise O. V. Edwards, Dominic A. Eggerman, Andrew C. Fabian, William R. Forman, Christine Jones, Nathaniel Kerman, Ralph P. Kraft, Yuan Li, Meredith C. Powell, Scott W. Randall, Philippe Salomé, Aurora Simionescu, Yuanyuan Su, Ming Sun, C. Megan Urry, Adrian N. Vantyghem, Belinda J. Wilkes, John A. ZuHone
The entire scenario is therefore consistent with a galaxy-spanning "fountain", wherein cold gas clouds drain into the black hole accretion reservoir, powering jets and bubbles that uplift a cooling plume of low-entropy multiphase gas, which may stimulate additional cooling and accretion as part of a self-regulating feedback loop.
Astrophysics of Galaxies
no code implementations • 21 Mar 2017 • M. C. David Marsh, Helen R. Russell, Andrew C. Fabian, Brian R. McNamara, Paul Nulsen, Christopher S. Reynolds
Axion-like particles (ALPs) and photons can quantum mechanically interconvert when propagating through magnetic fields, and ALP-photon conversion may induce oscillatory features in the spectra of astrophysical sources.
High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics High Energy Astrophysical Phenomena
1 code implementation • 7 Jun 2016 • Grant R. Tremblay, J. B. Raymond Oonk, Françoise Combes, Philippe Salomé, Christopher P. O'Dea, Stefi A. Baum, G. Mark Voit, Megan Donahue, Brian R. McNamara, Timothy A. Davis, Michael A. McDonald, Alastair C. Edge, Tracy E. Clarke, Roberto Galván-Madrid, Malcolm N. Bremer, Louise O. V. Edwards, Andrew C. Fabian, Stephen L. Hamer, Yuan Li, Anaëlle Maury, Helen R. Russell, Alice C. Quillen, C. Megan Urry, Jeremy S. Sanders, Michael Wise
Supermassive black holes in galaxy centres can grow by the accretion of gas, liberating energy that might regulate star formation on galaxy-wide scales.
Astrophysics of Galaxies High Energy Astrophysical Phenomena
1 code implementation • 10 Sep 2014 • Matteo Bachetti, Fiona A. Harrison, Rick Cook, John Tomsick, Christian Schmid, Brian W. Grefenstette, Didier Barret, Steven E. Boggs, Finn E. Christensen, William W. Craig, Andrew C. Fabian, Felix Fürst, Poshak Gandhi, Charles J. Hailey, Erin Kara, Thomas J. Maccarone, Jon M. Miller, Katja Pottschmidt, Daniel Stern, Phil Uttley, Dominic J. Walton, Jörn Wilms, William W. Zhang
The most obvious effect is a distortion of the white noise level in the power density spectrum (PDS) that cannot be modeled easily with the standard techniques due to the variable nature of the dead time.
High Energy Astrophysical Phenomena Instrumentation and Methods for Astrophysics
