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Gamma-ray emission from Cassiopeia A produced by accelerated cosmic rays

The nonlinear kinetic model of cosmic ray (CR) acceleration in supernova remnants (SNRs) is used to describe the relevant properties of Cassiopeia A (Cas A). In order to reproduce the SNR's observed size, expansion rate and thermal X-ray…

Astrophysics · Physics 2011-05-23 E. G. Berezhko , G. Puehlhofer , H. J. Voelk
Mapping the X-ray Emitting Ejecta in Cassiopeia A with Chandra

We present X-ray emission line equivalent width images of the bright Galactic supernova remnant Cassiopeia A for the elements Si, S, Ar, Ca, and Fe using a 50,000 s observation with the Advanced CCD Imaging Spectrometer on the Chandra X-ray…

Astrophysics · Physics 2009-10-31 Una Hwang , Stephen S. Holt , Robert Petre
The Circumstellar Medium of Cassiopeia A Inferred from the Outer Ejecta Knot Properties

We investigate the effect of the circumstellar medium density profile on the X-ray emission from outer ejecta knots in the Cassiopeia A supernova remnant using the 1 Ms Chandra observation. The spectra of a number of radial series of ejecta…

High Energy Astrophysical Phenomena · Physics 2015-05-13 Una Hwang , J. Martin Laming
The Kinematic and Plasma Properties of X-ray Knots in Cassiopeia A from the Chandra HETGS

We present high-resolution X-ray spectra from the young supernova remnant Cas A using a 70-ks observation taken by the Chandra High Energy Transmission Grating Spectrometer (HETGS). Line emission, dominated by Si and S ions, is used for…

Astrophysics · Physics 2008-11-26 J. S. Lazendic , D. Dewey , N. S. Schulz , C. R. Canizares
X-ray polarization detection of Cassiopeia A with IXPE

We report on a $\sim 5\sigma$ detection of polarized 3-6 keV X-ray emission from the supernova remnant Cassiopeia A with the Imaging X-ray Polarimetry Explorer (IXPE). The overall polarization degree of $1.8 \pm 0.3$% is detected by summing…

High Energy Astrophysical Phenomena · Physics 2022-10-26 Jacco Vink , Dmitry Prokhorov , Riccardo Ferrazzoli , Patrick Slane , Ping Zhou , Kazunori Asakura , Luca Baldini , Niccolo Bucciantini , Enrico Costa , Alessandro Di Marco , Jeremy Heyl , Frederic Marin , Tsunefumi Mizuno , C. Y. Ng , Melissa Pesce-Rollins , Brian D. Ramsey , John Rankin , Ajay Ratheesh , Carmelo Sgro , Paolo Soffitta , Douglas A. Swartz , Toru Tamagawa , Martin C. Weisskopf , Yi-Jung Yang , Ronaldo Bellazzini , Raffaella Bonino , Elisabetta Cavazzuti , Luigi Costamante , Niccolo Di Lalla , Luca Latronico , Simone Maldera , Alberto Manfreda , Francesco Massaro , Ikuyuki Mitsuishi , Nicola Omodei , Chiara Oppedisano , Silvia Zane , Ivan Agudo , Lucio A. Antonelli , Matteo Bachetti , Wayne H. Baumgartner , Stefano Bianchi , Stephen D. Bongiorno , Alessandro Brez , Fiamma Capitanio , Simone Castellano , Stefano Ciprini , Alessandra De Rosa , Ettore Del Monte , Laura Di Gesu , Immacolata Donnarumma , Victor Doroshenko , Michal Dovciak , Steven R. Ehlert , Teruaki Enoto , Yuri Evangelista , Sergio Fabiani , Javier A. Garcia , Shuichi Gunji , Kiyoshi Hayashida , Wataru Iwakiri , Svetlana G. Jorstad , Vladimir Karas , Takao Kitaguchi , Jeffery J. Kolodziejczak , Henric Krawczynski , Fabio La Monaca , Ioannis Liodakis , Andrea Marinucci , Alan P. Marscher , Herman L. Marshall , Giorgio Matt , Fabio Muleri , Stephen L. O'Dell , Alessandro Papitto , George G. Pavlov , Abel L. Peirson , Matteo Perri , Maura Pilia , Andrea Possenti , Juri Poutanen , Simonetta Puccetti , Roger W. Romani , Gloria Spandre , Fabrizio Tavecchio , Roberto Taverna , Yuzuru Tawara , Allyn F. Tennant , Nicolas E. Thomas , Francesco Tombesi , Alessio Trois , Sergey Tsygankov , Roberto Turolla , Kinwah Wu , Fei Xie
A Detailed Kinematic Map of Cassiopeia A's Optical Main Shell and Outer High-Velocity Ejecta

We present three-dimensional kinematic reconstructions of optically emitting material in the young Galactic supernova remnant Cassiopeia A (Cas A). These Doppler maps have the highest spectral and spatial resolutions of any previous survey…

High Energy Astrophysical Phenomena · Physics 2015-06-16 Dan Milisavljevic , Robert A. Fesen
Broadband $\gamma$-ray spectrum of supernova remnant Cassiopeia A

The core-collapse supernova remnant (SNR) Cassiopeia A (Cas A) is one of the brightest galactic radio sources with an angular radius of $\sim$ 2.5 $\arcmin$. Although no extension of this source has been detected in the $\gamma$-ray band,…

High Energy Astrophysical Phenomena · Physics 2025-02-10 Zhen Cao , F. Aharonian , Y. X. Bai , Y. W. Bao , D. Bastieri , X. J. Bi , Y. J. Bi , W. Bian , A. V. Bukevich , C. M. Cai , W. Y. Cao , Zhe Cao , J. Chang , J. F. Chang , A. M. Chen , E. S. Chen , H. X. Chen , Liang Chen , Long Chen , M. J. Chen , M. L. Chen , Q. H. Chen , S. Chen , S. H. Chen , S. Z. Chen , T. L. Chen , X. B. Chen , X. J. Chen , Y. Chen , N. Cheng , Y. D. Cheng , M. C. Chu , M. Y. Cui , S. W. Cui , X. H. Cui , Y. D. Cui , B. Z. Dai , H. L. Dai , Z. G. Dai , Danzengluobu , Y. X. Diao , X. Q. Dong , K. K. Duan , J. H. Fan , Y. Z. Fan , J. Fang , J. H. Fang , K. Fang , C. F. Feng , H. Feng , L. Feng , S. H. Feng , X. T. Feng , Y. Feng , Y. L. Feng , S. Gabici , B. Gao , C. D. Gao , Q. Gao , W. Gao , W. K. Gao , M. M. Ge , T. T. Ge , L. S. Geng , G. Giacinti , G. H. Gong , Q. B. Gou , M. H. Gu , F. L. Guo , J. Guo , X. L. Guo , Y. Q. Guo , Y. Y. Guo , Y. A. Han , O. A. Hannuksela , M. Hasan , H. H. He , H. N. He , J. Y. He , X. Y. He , Y. He , S. Hernández-Cadena , Y. K. Hor , B. W. Hou , C. Hou , X. Hou , H. B. Hu , S. C. Hu , C. Huang , D. H. Huang , J. J. Huang , T. Q. Huang , W. J. Huang , X. T. Huang , X. Y. Huang , Y. Huang , Y. Y. Huang , X. L. Ji , H. Y. Jia , K. Jia , H. B. Jiang , K. Jiang , X. W. Jiang , Z. J. Jiang , M. Jin , S. Kaci , M. M. Kang , I. Karpikov , D. Khangulyan , D. Kuleshov , K. Kurinov , B. B. Li , Cheng Li , Cong Li , D. Li , F. Li , H. B. Li , H. C. Li , Jian Li , Jie Li , K. Li , L. Li , R. L. Li , S. D. Li , T. Y. Li , W. L. Li , X. R. Li , Xin Li , Y. Z. Li , Zhe Li , Zhuo Li , E. W. Liang , Y. F. Liang , S. J. Lin , B. Liu , C. Liu , D. Liu , D. B. Liu , H. Liu , H. D. Liu , J. Liu , J. L. Liu , J. R. Liu , M. Y. Liu , R. Y. Liu , S. M. Liu , W. Liu , X. Liu , Y. Liu , Y. Liu , Y. N. Liu , Y. Q. Lou , Q. Luo , Y. Luo , H. K. Lv , B. Q. Ma , L. L. Ma , X. H. Ma , J. R. Mao , Z. Min , W. Mitthumsiri , G. B. Mou , H. J. Mu , Y. C. Nan , A. Neronov , K. C. Y. Ng , M. Y. Ni , L. Nie , L. J. Ou , P. Pattarakijwanich , Z. Y. Pei , J. C. Qi , M. Y. Qi , J. J. Qin , A. Raza , C. Y. Ren , D. Ruffolo , A. Sáiz , M. Saeed , D. Semikoz , L. Shao , O. Shchegolev , Y. Z. Shen , X. D. Sheng , Z. D. Shi , F. W. Shu , H. C. Song , Yu. V. Stenkin , V. Stepanov , Y. Su , D. X. Sun , H. Sun , Q. N. Sun , X. N. Sun , Z. B. Sun , N. H. Tabasam , J. Takata , P. H. T. Tam , H. B. Tan , Q. W. Tang , R. Tang , Z. B. Tang , W. W. Tian , C. N. Tong , L. H. Wan , C. Wang , G. W. Wang , H. G. Wang , H. H. Wang , J. C. Wang , K. Wang , Kai Wang , Kai Wang , L. P. Wang , L. Y. Wang , L. Y. Wang , R. Wang , W. Wang , X. G. Wang , X. J. Wang , X. Y. Wang , Y. Wang , Y. D. Wang , Z. H. Wang , Z. X. Wang , Zheng Wang , D. M. Wei , J. J. Wei , Y. J. Wei , T. Wen , S. S. Weng , C. Y. Wu , H. R. Wu , Q. W. Wu , S. Wu , X. F. Wu , Y. S. Wu , S. Q. Xi , J. Xia , J. J. Xia , G. M. Xiang , D. X. Xiao , G. Xiao , Y. L. Xin , Y. Xing , D. R. Xiong , Z. Xiong , D. L. Xu , R. F. Xu , R. X. Xu , W. L. Xu , L. Xue , D. H. Yan , J. Z. Yan , T. Yan , C. W. Yang , C. Y. Yang , F. F. Yang , L. L. Yang , M. J. Yang , R. Z. Yang , W. X. Yang , Y. H. Yao , Z. G. Yao , X. A. Ye , L. Q. Yin , N. Yin , X. H. You , Z. Y. You , Y. H. Yu , Q. Yuan , H. Yue , H. D. Zeng , T. X. Zeng , W. Zeng , M. Zha , B. B. Zhang , B. T. Zhang , F. Zhang , H. Zhang , H. M. Zhang , H. Y. Zhang , J. L. Zhang , Li Zhang , P. F. Zhang , P. P. Zhang , R. Zhang , S. R. Zhang , S. S. Zhang , W. Y. Zhang , X. Zhang , X. P. Zhang , Yi Zhang , Yong Zhang , Z. P. Zhang , J. Zhao , L. Zhao , L. Z. Zhao , S. P. Zhao , X. H. Zhao , Z. H. Zhao , F. Zheng , W. J. Zhong , B. Zhou , H. Zhou , J. N. Zhou , M. Zhou , P. Zhou , R. Zhou , X. X. Zhou , X. X. Zhou , B. Y. Zhu , C. G. Zhu , F. R. Zhu , H. Zhu , K. J. Zhu , Y. C. Zou , X. Zuo
A Deep Near-Infrared [Fe II]+[Si I] Emission Line Image of the Supernova Remnant Cassiopeia A

We present a long-exposure (~10 hr) image of the supernova (SN) remnant Cassiopeia A (Cas A) obtained with the UKIRT 3.8-m telescope using a narrow band filter centered at 1.644 um emission. The passband contains [Fe II] 1.644 um and [Si I]…

Astrophysics of Galaxies · Physics 2018-10-31 Bon-Chul Koo , Hyun-Jeong Kim , Yong-Hyun Lee , John C. Raymond , Jae-Joon Lee , Sung-Chul Yoon , Dae-Sik Moon
A Herschel PACS and SPIRE study of the dust content of the Cassiopeia A supernova remnant

Using the 3.5-m Herschel Space Observatory, imaging photometry of Cas A has been obtained in six bands between 70 um and 500 um with the PACS and SPIRE instruments, with angular resolutions ranging from 6 to 37". In the outer regions of the…

Astrophysics of Galaxies · Physics 2015-05-19 M. J. Barlow , O. Krause , B. M. Swinyard , B. Sibthorpe , M. -A. Besel , R. Wesson , R. J. Ivison , L. Dunne , W. K. Gear , H. L. Gomez , P. C. Hargrave , Th. Henning , S. J. Leeks , T. L. Lim , G. Olofsson , E. T. Polehampton
Dynamics of the intermediate-mass-element ejecta in the Supernova Remnant Cassiopeia A studied with XRISM

Supernova remnants (SNRs) provide crucial information of yet poorly understood mechanism of supernova explosion. Here we present XRISM high-resolution spectroscopy of the intermediate-mass-element (IME) ejecta in the SNR Cas A to determine…

High Energy Astrophysical Phenomena · Physics 2025-04-01 Shunsuke Suzuki , Haruto Sonoda , Yusuke Sakai , Yuken Ohshiro , Shinya Yamada , Manan Agarwal , Satoru Katsuda , Hiroya Yamaguchi
Far-infrared Polarization of the Supernova Remnant Cassiopeia A with SOFIA HAWC+

We present polarization observations of the young supernova remnant (SNR) Cas A using the High-resolution Airborne Wideband Camera-Plus (HAWC+) instrument onboard the Stratospheric Observatory for Infrared Astronomy (SOFIA). The…

Astrophysics of Galaxies · Physics 2023-05-03 Jeonghee Rho , Aravind P. Ravi , Le Ngoc Tram , Thiem Hoang , Jérémy Chastenet , Matthew Millard , Michael J. Barlow , Ilse De Looze , Haley L. Gomez , Florian Kirchschlager , Loretta Dunne
The X-ray Spectrum of Supernova Remnant 1987A

We discuss the X-ray emission observed from Supernova Remnant 1987A with the Chandra X-ray Observatory. We analyze a high resolution spectrum obtained in 1999 October with the high energy transmission grating (HETG). From this spectrum we…

Astrophysics · Physics 2009-11-07 Eli Michael , Svetozar Zhekov , Richard McCray , Una Hwang , David N. Burrows , Sangwook Park , Gordon P. Garmire , Stephen S. Holt , Guenther Hasinger
Thermal and Nonthermal Emission from the Forward Shock in Tycho's Supernova Remnant

We present Chandra X-ray images of Tycho's supernova remnant that delineate its outer shock as a thin, smooth rim along the straight northeastern edge and most of the circular western half. The images also show that the Si and S ejecta are…

Astrophysics · Physics 2009-11-07 Una Hwang , Anne Decourchelle , Stephen S. Holt , Robert Petre
A Million-Second Chandra View of Cassiopeia A

We introduce a million-second observation of the supernova remnant Cassiopeia A with the Chandra X-ray Observatory. The bipolar structure of the Si-rich ejecta (NE jet and SW counterpart) is clearly evident in the new images, and their…

Astrophysics · Physics 2009-11-10 Una Hwang , J. Martin Laming , Carles Badenes , Fred Berendse , John Blondin , Denis Cioffi , Tracey DeLaney , Daniel Dewey , Robert Fesen , Kathryn A. Flanagan , Christopher L. Fryer , Parviz Ghavamian , John P. Hughes , Jon A. Morse , Paul P. Plucinsky , Robert Petre , Martin Pohl , Lawrence Rudnick , Ravi Sankrit , Patrick O. Slane , Randall K. Smith , Jacco Vink , Jessica S. Warren
X-ray observation of the shocked red supergiant wind of Cassiopeia A

Cas A is a Galactic supernova remnant whose supernova explosion is observed to be of Type IIb from spectroscopy of its light echo. Having its SN type known, observational constraints on the mass-loss history of Cas A's progenitor can…

High Energy Astrophysical Phenomena · Physics 2014-06-18 Jae-Joon Lee , Sangwook Park , John P. Hughes , Patrick O. Slane
Locating the most energetic electrons in Cassiopeia A

We present deep ($>$2.4 Ms) observations of the Cassiopeia A supernova remnant with {\it NuSTAR}, which operates in the 3--79 keV bandpass and is the first instrument capable of spatially resolving the remnant above 15 keV. We find that the…

High Energy Astrophysical Phenomena · Physics 2015-06-23 Brian W. Grefenstette , Stephen P. Reynolds , Fiona A. Harrison , T. Brian Humensky , Steven E. Boggs , Chris L. Fryer , Tracey DeLaney , Kristin K. Madsen , Hiromasa Miyasaka , Daniel R. Wik , Andreas Zoglauer , Karl Forster , Takao Kitaguchi , Laura Lopez , Melania Nynka , Finn E. Christensen , William W. Craig , Charles J. Hailey , Daniel Stern , William W. Zhang
Photons and Particle Production in Cassiopeia A: Predictions from Nonlinear Diffusive Shock Acceleration

We calculate particle spectra and continuum photon emission from the Cassiopeia A supernova remnant (SNR). The particle spectra, ion and electron, result from diffusive shock acceleration at the forward SNR shock and are determined with a…

Astrophysics · Physics 2007-05-23 Donald C. Ellison , Philippe Goret , Matthew G. Baring , Isabelle A. Grenier , Pierre-Olivier Lagage
The auto and cross angular power spectrum of the Cas A supernova remnant in radio and X-ray

The shell type supernova remnant (SNR) Cas A exhibits structures at nearly all angular scales. Previous studies show the angular power spectrum $(C_{\ell})$ of the radio emission to be a broken power law, consistent with MHD turbulence. The…

Astrophysics of Galaxies · Physics 2021-02-24 Preetha Saha , Somnath Bharadwaj , Susmita Chakravorty , Nirupam Roy , Samir Choudhuri , Hans Moritz Günther , Randall K. Smith
Revisiting X-ray polarization of the shell of Cassiopeia A using spectropolarimetric analysis

X-ray synchrotron radiation is expected to be highly polarized. Thanks to the Imaging X-ray Polarimetry Explorer (IXPE), it is now possible to evaluate the degree of X-ray polarization in sources such as supernova remnants (SNRs). Jointly…

High Energy Astrophysical Phenomena · Physics 2025-04-10 Alessandra Mercuri , Emanuele Greco , Jacco Vink , Riccardo Ferrazzoli , Silvia Perri
On the Determination of Ejecta Structure and Explosion Asymmetry from the X-ray Knots of Cassiopeia A

We present a detailed analysis of Chandra X-ray spectra from individual ejecta knots in the supernova remnant Cassiopeia A. The spectra are fitted to give the electron temperature and (single) ionization age. These quantities are compared…

Astrophysics · Physics 2009-11-07 J. Martin Laming , Una Hwang
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