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295 results on '"Roediger, E."'

51. Fast Simulations of Gas Sloshing and Cold Front Formation

Author

Roediger, E and ZuHone, J. A

Subjects
Astrophysics
Abstract

We present a simplified and fast method for simulating minor mergers between galaxy clusters. Instead of following the evolution of the dark matter halos directly by the N-body method, we employ a rigid potential approximation for both clusters. The simulations are run in the rest frame of the more massive cluster and account for the resulting inertial accelerations in an optimised way. We test the reliability of this method for studies of minor merger induced gas sloshing by performing a one-to-one comparison between our simulations and hydro+N-body ones. We find that the rigid potential approximation reproduces the sloshing-related features well except for two artifacts: the temperature just outside the cold fronts is slightly over-predicted, and the outward motion of the cold fronts is delayed by typically 200 Myr. We discuss reasons for both artifacts.

Published
2012

52. Fast Simulations of Gas Sloshing and Cold Front Formation

Author

Roediger, E and ZuHone, J. A

Subjects
Meteorology And Climatology
Abstract

We present a simplified and fast method for simulating minor mergers between galaxy clusters. Instead of following the evolution of the dark matter halos directly by the N-body method, we employ a rigid potential approximation for both clusters. The simulations are run in the rest frame of the more massive cluster and account for the resulting inertial accelerations in an optimised way. We test the reliability of this method for studies of minor merger induced gas sloshing by performing a one-to-one comparison between our simulations and hydro+N-body ones. We find that the rigid potential approximation reproduces the sloshing-related features well except for two artefacts: the temperature just outside the cold fronts is slightly over-predicted, and the outward motion of the cold fronts is delayed by typically 200 Myr. We discuss reasons for both artefacts.

Published
2011

53. Physics of cosmic plasmas from high angular resolution X-ray imaging of galaxy clusters

Author

Markevitch, M, Bulbul, E, Churazov, E, Giacintucci, S, Kraft, R, Kunz, M, Nagai, D, Roediger, E, Ruszkowski, M, Schekochihin, A, Weeren, RV, Vikhlinin, A, Walker, SA, Wang, QHS, Werner, N, Wik, D, Zhuravleva, I, and Zuhone, J

Subjects
High Energy Astrophysical Phenomena (astro-ph.HE), Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics - High Energy Astrophysical Phenomena
Abstract

Galaxy clusters are massive dark matter-dominated systems filled with X-ray emitting, optically thin plasma. Their large size and relative simplicity (at least as astrophysical objects go) make them a unique laboratory to measure some of the interesting plasma properties that are inaccessible by other means but fundamentally important for understanding and modeling many astrophysical phenomena -- from solar flares to black hole accretion to galaxy formation and the emergence of the cosmological Large Scale Structure. While every cluster astrophysicist is eagerly anticipating the direct gas velocity measurements from the forthcoming microcalorimeters onboard XRISM, Athena and future missions such as Lynx, a number of those plasma properties can best be probed by high-resolution X-ray imaging of galaxy clusters. Chandra has obtained some trailblazing results, but only grazed the surface of such studies. In this white paper, we discuss why we need arcsecond-resolution, high collecting area, low relative background X-ray imagers (with modest spectral resolution), such as the proposed AXIS and the imaging detector of Lynx., Comment: Science white paper submitted for Astro2020 Decadal survey. 9 pages, 4 figures

Published
2019

55. Jupiter's X-ray and EUV Auroras Monitored by Chandra, XMM-Newton, and Hisaki Satellite

Author

Kraft, R. P., Elsner, R. F., Branduardi-Raymont, G., Gladstone, G. R., Vogt, M. F., Masters, Adam, Badman, Sarah V., Roediger, E., Dunn, W. R., Murray, S. S., Kimura, Tomoki, Tao, Chihiro, Yoshioka, Kazuo, Murakami, Go, Yamazaki, Atsushi, Tsuchiya, Fuminori, Hasegawa, Hiroshi, Ezoe, Yuichiro, Yoshikawa, Ichiro, and Fujimoto, Masaki

Abstract

著者人数: 20名, Accepted: 2016-01-29, 資料番号: SA1150298000

Published
2016

56. Deep Chandra Observation and Numerical Studies of the Nearest Cluster Cold Front in the Sky

Author

Werner, Norbert, ZuHone, J. A., Zhuravleva, I., Simionescu, Aurora, Allen, Steven W., Markevitch, M., Fabian, A. C., Keshet, U., Roediger, E., Ruszkowski, M., Sanders, J. S., and Ichinohe, Yuto

Subjects
Cosmology and Nongalactic Astrophysics (astro-ph.CO), galaxies: clusters: intracluster medium, media_common.quotation_subject, FOS: Physical sciences, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, 01 natural sciences, Galaxy groups and clusters, Intracluster medium, 0103 physical sciences, Magnetic pressure, 010306 general physics, 010303 astronomy & astrophysics, Astrophysics::Galaxy Astrophysics, media_common, Physics, High Energy Astrophysical Phenomena (astro-ph.HE), Astronomy and Astrophysics, Thermal conduction, Astrophysics - Astrophysics of Galaxies, Magnetic field, Cold front, Space and Planetary Science, Sky, instabilities, Astrophysics of Galaxies (astro-ph.GA), X-rays: galaxies: clusters, hydrodynamics, galaxies: clusters: individual: Virgo, Magnetohydrodynamics, Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

著者人数: 12名, Accepted: 2015-10-08, 資料番号: SA1150215000

Published
2016

57. Extended X-Ray Study of M49: The Frontier of the Virgo Cluster

Author

Su, Y., primary, Kraft, R. P., additional, Nulsen, P. E. J., additional, Jones, C., additional, Maccarone, T. J., additional, Mernier, F., additional, Lovisari, L., additional, Sheardown, A., additional, Randall, S. W., additional, Roediger, E., additional, Fish, T. M., additional, Forman, W. R., additional, and Churazov, E., additional

Published
2019
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60. Chandra and JVLA Observations of HST Frontier Fields Cluster MACS J0717.5+3745

Author

MIT Kavli Institute for Astrophysics and Space Research, Bulbul, Gul E, van Weeren, R. J., Ogrean, G. A., Jones, C., Forman, W. R., Andrade-Santos, F., Pearce, Connor J. J., Bonafede, A., Brüggen, M., Clarke, T. E., Churazov, E., David, L., Dawson, W. A., Donahue, M., Goulding, A., Kraft, R. P., Mason, B., Merten, J., Mroczkowski, T., Nulsen, P. E. J., Rosati, P., Roediger, E., Randall, S. W., Sayers, J., Umetsu, K., Vikhlinin, A., Zitrin, A., MIT Kavli Institute for Astrophysics and Space Research, Bulbul, Gul E, van Weeren, R. J., Ogrean, G. A., Jones, C., Forman, W. R., Andrade-Santos, F., Pearce, Connor J. J., Bonafede, A., Brüggen, M., Clarke, T. E., Churazov, E., David, L., Dawson, W. A., Donahue, M., Goulding, A., Kraft, R. P., Mason, B., Merten, J., Mroczkowski, T., Nulsen, P. E. J., Rosati, P., Roediger, E., Randall, S. W., Sayers, J., Umetsu, K., Vikhlinin, A., and Zitrin, A.

Abstract

To investigate the relationship between thermal and non-thermal components in merger galaxy clusters, we present deep JVLA and Chandra observations of the HST Frontier Fields cluster MACS J0717.5+3745. The Chandra image shows a complex merger event, with at least four components belonging to different merging subclusters. Northwest of the cluster, ~0.7 Mpc from the center, there is a ram-pressure-stripped core that appears to have traversed the densest parts of the cluster after entering the intracluster medium (ICM) from the direction of a galaxy filament to the southeast. We detect a density discontinuity north-northeast of this core, which we speculate is associated with a cold front. Our radio images reveal new details for the complex radio relic and radio halo in this cluster. In addition, we discover several new filamentary radio sources with sizes of 100–300 kpc. A few of these seem to be connected to the main radio relic, while others are either embedded within the radio halo or projected onto it. A narrow-angled-tailed (NAT) radio galaxy, a cluster member, is located at the center of the radio relic. The steep spectrum tails of this active galactic nucleus lead into the large radio relic where the radio spectrum flattens again. This morphological connection between the NAT radio galaxy and relic provides evidence for re-acceleration (revival) of fossil electrons. The presence of hot gsim20 keV ICM gas detected by Chandra near the relic location provides additional support for this re-acceleration scenario.

Published
2017

79. Jupiter's X-ray and EUV auroras monitored by Chandra, XMM-Newton, and Hisaki satellite

Author

Kimura, T., Kraft, R. P., Elsner, R. F., Branduardi-Raymont, G., Gladstone, G. R., Tao, C., Yoshioka, K., Murakami, G., Yamazaki, A., Tsuchiya, F., Vogt, M. F., Masters, A., Hasegawa, H., Badman, S. V., Roediger, E., Ezoe, Y., Dunn, W. R., Yoshikawa, I., Fujimoto, M., Murray, S. S., Institut de recherche en astrophysique et planétologie (IRAP), Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), and Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS)

Subjects
X-ray, [SDU]Sciences of the Universe [physics], Jupiter, Astrophysics::High Energy Astrophysical Phenomena, Physics::Space Physics, magnetosphere
Abstract

International audience; Jupiter's X-ray auroral emission in the polar cap region results from particles which have undergone strong field-aligned acceleration into the ionosphere. The origin of precipitating ions and electrons and the time variability in the X-ray emission are essential to uncover the driving mechanism for the high-energy acceleration. The magnetospheric location of the source field line where the X-ray is generated is likely affected by the solar wind variability. However, these essential characteristics are still unknown because the long-term monitoring of the X-rays and contemporaneous solar wind variability has not been carried out. In April 2014, the first long-term multiwavelength monitoring of Jupiter's X-ray and EUV auroral emissions was made by the Chandra X-ray Observatory, XMM-Newton, and Hisaki satellite. We find that the X-ray count rates are positively correlated with the solar wind velocity and insignificantly with the dynamic pressure. Based on the magnetic field mapping model, a half of the X-ray auroral region was found to be open to the interplanetary space. The other half of the X-ray auroral source region is magnetically connected with the prenoon to postdusk sector in the outermost region of the magnetosphere, where the Kelvin-Helmholtz (KH) instability, magnetopause reconnection, and quasiperiodic particle injection potentially take place. We speculate that the high-energy auroral acceleration is associated with the KH instability and/or magnetopause reconnection. This association is expected to also occur in many other space plasma environments such as Saturn and other magnetized rotators.

Published
2016

84. Chandraand JVLA Observations ofHSTFrontier Fields Cluster MACS J0717.5+3745

Author

van Weeren, R. J., primary, Ogrean, G. A., additional, Jones, C., additional, Forman, W. R., additional, Andrade-Santos, F., additional, Pearce, Connor J. J., additional, Bonafede, A., additional, Brüggen, M., additional, Bulbul, E., additional, Clarke, T. E., additional, Churazov, E., additional, David, L., additional, Dawson, W. A., additional, Donahue, M., additional, Goulding, A., additional, Kraft, R. P., additional, Mason, B., additional, Merten, J., additional, Mroczkowski, T., additional, Nulsen, P. E. J., additional, Rosati, P., additional, Roediger, E., additional, Randall, S. W., additional, Sayers, J., additional, Umetsu, K., additional, Vikhlinin, A., additional, and Zitrin, A., additional

Published
2017
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86. Jupiter's X-ray and EUV Auroras Monitored by Chandra, XMM-Newton, and Hisaki Satellite

Author

Kimura, Tomoki, Kraft, R. P., Elsner, R. F., Branduardi-Raymont, G., Gladstone, G. R., Tao, Chihiro, Yoshioka, Kazuo, Murakami, Go, Yamazaki, Atsushi, Tsuchiya, Fuminori, Vogt, M. F., Masters, Adam, Hasegawa, Hiroshi, Badman, Sarah V., Roediger, E., Ezoe, Yuichiro, Dunn, W. R., Yoshikawa, Ichiro, Fujimoto, Masaki, Murray, S. S., 木村, 智樹, 垰, 千尋, 吉岡, 和夫, 村上, 豪, 山崎, 敦, 土屋, 史紀, 長谷川, 洋, 江副, 祐一郎, 吉川, 一朗, 藤本, 正樹, Kimura, Tomoki, Kraft, R. P., Elsner, R. F., Branduardi-Raymont, G., Gladstone, G. R., Tao, Chihiro, Yoshioka, Kazuo, Murakami, Go, Yamazaki, Atsushi, Tsuchiya, Fuminori, Vogt, M. F., Masters, Adam, Hasegawa, Hiroshi, Badman, Sarah V., Roediger, E., Ezoe, Yuichiro, Dunn, W. R., Yoshikawa, Ichiro, Fujimoto, Masaki, Murray, S. S., 木村, 智樹, 垰, 千尋, 吉岡, 和夫, 村上, 豪, 山崎, 敦, 土屋, 史紀, 長谷川, 洋, 江副, 祐一郎, 吉川, 一朗, and 藤本, 正樹

Abstract

著者人数: 20名, Accepted: 2016-01-29

Published
2016

89. FRONTIER FIELDS CLUSTERS: DEEPCHANDRAOBSERVATIONS OF THE COMPLEX MERGER MACS J1149.6+2223

Author

Ogrean, G. A., primary, Weeren, R. J. van, additional, Jones, C., additional, Forman, W., additional, Dawson, W. A., additional, Golovich, N., additional, Andrade-Santos, F., additional, Murray, S. S., additional, Nulsen, P., additional, Roediger, E., additional, Zitrin, A., additional, Bulbul, E., additional, Kraft, R., additional, Goulding, A., additional, Umetsu, K., additional, Mroczkowski, T., additional, Bonafede, A., additional, Randall, S., additional, Sayers, J., additional, Churazov, E., additional, David, L., additional, Merten, J., additional, Donahue, M., additional, Mason, B., additional, Rosati, P., additional, Vikhlinin, A., additional, and Ebeling, H., additional

Published
2016
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90. Jupiter's X-ray and EUV auroras monitored by Chandra, XMM-Newton, and Hisaki satellite

Author

Kimura, T., primary, Kraft, R. P., additional, Elsner, R. F., additional, Branduardi-Raymont, G., additional, Gladstone, G. R., additional, Tao, C., additional, Yoshioka, K., additional, Murakami, G., additional, Yamazaki, A., additional, Tsuchiya, F., additional, Vogt, M. F., additional, Masters, A., additional, Hasegawa, H., additional, Badman, S. V., additional, Roediger, E., additional, Ezoe, Y., additional, Dunn, W. R., additional, Yoshikawa, I., additional, Fujimoto, M., additional, and Murray, S. S., additional

Published
2016
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91. THE DISCOVERY OF LENSED RADIO AND X-RAY SOURCES BEHIND THE FRONTIER FIELDS CLUSTER MACS J0717.5+3745 WITH THE JVLA ANDCHANDRA

Author

Weeren, R. J. van, primary, Ogrean, G. A., additional, Jones, C., additional, Forman, W. R., additional, Andrade-Santos, F., additional, Bonafede, A., additional, Brüggen, M., additional, Bulbul, E., additional, Clarke, T. E., additional, Churazov, E., additional, David, L., additional, Dawson, W. A., additional, Donahue, M., additional, Goulding, A., additional, Kraft, R. P., additional, Mason, B., additional, Merten, J., additional, Mroczkowski, T., additional, Murray, S. S., additional, Nulsen, P. E. J., additional, Rosati, P., additional, Roediger, E., additional, Randall, S. W., additional, Sayers, J., additional, Umetsu, K., additional, Vikhlinin, A., additional, and Zitrin, A., additional

Published
2016
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93. FRONTIER FIELDS CLUSTERS:CHANDRAAND JVLA VIEW OF THE PRE-MERGING CLUSTER MACS J0416.1-2403

Author

Ogrean, G. A., primary, Weeren, R. J. van, additional, Jones, C., additional, Clarke, T. E., additional, Sayers, J., additional, Mroczkowski, T., additional, Nulsen, P. E. J., additional, Forman, W., additional, Murray, S. S., additional, Pandey-Pommier, M., additional, Randall, S., additional, Churazov, E., additional, Bonafede, A., additional, Kraft, R., additional, David, L., additional, Andrade-Santos, F., additional, Merten, J., additional, Zitrin, A., additional, Umetsu, K., additional, Goulding, A., additional, Roediger, E., additional, Bagchi, J., additional, Bulbul, E., additional, Donahue, M., additional, Ebeling, H., additional, Johnston-Hollitt, M., additional, Mason, B., additional, Rosati, P., additional, and Vikhlinin, A., additional

Published
2015
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98. Effektivitätsstudien zur Schematherapie

Author

Bamelis, L.L.M., Giesen-Bloo, J.H, Bernstein, D.P., Arntz, A.R., Roediger, E., Jacob, G., Clinical Psychological Science, RS: FPN CPS III, and RS: FPN CPS IV

Published
2010

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