2014A&A...563A..88S


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.13CEST06:41:04

2014A&A...563A..88S - Astronomy and Astrophysics, volume 563A, 88-88 (2014/3-1)

Origin of gamma-ray emission in the shell of Cassiopeia A.

SAHA L., ERGIN T., MAJUMDAR P., BOZKURT M. and ERCAN E.N.

Abstract (from CDS):

Non-thermal X-ray emission from the shell of Cassiopeia A (Cas A) has been an interesting subject of study, as it provides information about relativistic electrons and their acceleration mechanisms in shocks. The Chandra X-ray observatory revealed the detailed spectral and spatial structure of this supernova remnant in X-rays. The spectral analysis of the Chandra X-ray data of Cas A shows unequal flux levels for different regions of the shell, which can be attributed to different magnetic fields in those regions. Additionally, the GeV gamma-ray emission observed by the Large Area Telescope on board the Fermi Gamma-Ray Space Telescope showed that the hadronic processes are dominating in Cas A, which is a clear signature of acceleration of protons. The aim of this study is to locate the origin of gamma-rays based on the X-ray data of the shell of Cas A. We also aim to explain the GeV-TeV gamma-ray data in the context of both leptonic and hadronic scenarios. We modelled the multi-wavelength spectrum of Cas A. We use a synchrotron emission process to explain the observed non-thermal X-ray fluxes from different regions of the shell. This results in estimates of the model parameters which are then used to explain TeV gamma-ray emission spectrum. We also use a hadronic scenario to explain both GeV and TeV fluxes simultaneously. Based on this analysis, it has been shown that the southern part of the remnant is bright in TeV gamma-rays. We also show that the leptonic model alone cannot explain the GeV-TeV data. Therefore, we need to invoke a hadronic model to explain the observed GeV-TeV fluxes. We found that the lepto-hadronic model provides the best fit to the data although the pure hadronic model is able to explain the GeV-TeV data.

Abstract Copyright:

Journal keyword(s): acceleration of particles - radiation mechanisms: non-thermal - supernovae: individual: Cassiopeia A

Simbad objects: 1

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Number of rows : 1

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NAME Cas A SNR 23 23 24.000 +58 48 54.00           ~ 2414 1

    Equat.    Gal    SGal    Ecl

C.D.S. - SIMBAD4 rel 1.7 - 2020.07.13CEST06:41:04

Available data : Basic data  •  Identifiers  •  Plot & images  •  Bibliography  •  Measurements  •  External archives  •  Notes  •  Annotations


Basic data :
NAME Cas A -- SuperNova Remnant
Origin of the objects types :

(Ref) Object type as listed in the reference "Ref"
(acronym) Object type linked to the acronym according to the original reference
() Anterior to 2007, before we can link the objet type to a reference, or given by the CDS team in some particular cases

Other object types:
X (3A,CXOU,...), Rad (BWE,3C,...), gam (1FGL,2FGL,...), SNR (Ref,2013ApJS..207...19B,...), SN* (SN)
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
ICRS coord. (ep=J2000) :
23 23 24.000 +58 48 54.00 [ ] D 2015ApJS..217....2M
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
FK4 coord. (ep=B1950 eq=1950) :
23 21 08.219 +58 32 25.55 [ ]
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
Gal coord. (ep=J2000) :
111.734745 -02.129570 [ ]
Syntax of angular size is : "maj-axis min-axis angle (wtype) quality bibcode"
  • maj-axis : major axis size (arc minutes)
  • min-axis : minor axis size (arc minutes)
  • angle : orientation angle (in degrees)
  • (wtype) : wavelength class for the origin of the angular size (Rad, mm, IR, Opt, UV, Xray, Gam)
  • quality : flag of quality of the angular size values ( A=best quality -> E=worst quality, {� } =unknown quality)
  • bibcode : bibcode of the angular size reference
Angular size (arcmin):
5.0 5.0 90 (Rad) D 2014BASI...42...47G
SIMBAD with radius arcmin
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The search radius has to be specified by the user. It is currently limited to a maximum of 30 arcsec. It depends mostly on the precision or quality of the coordinates (SIMBAD and VizieR catalogs), the resolution of the images from which the sources were extracted, source extent, and source crowding.
Suggestions are: crowded field: 0.5 to 1.5 arcsec, 3 arcsec otherwise; uncertain coordinates (SIMBAD quality E or coordinates without reference): 5 to 30 arsec (risky!).
Some important notes on this object about identifications and objects associations.
notes:


Hierarchy : number of linked objects
whatever the membership probability is (see description here ) :

: 1 Display criteria :

The link on the acronym of the identifiers give access to the information for this acronym in the dictionary of nomenclature.
Identifiers (44) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

NAME Cas A CXOU J232327.9+584842 3FHL J2323.4+5848 SN 1667
3A 2321+585 DA 601 GAL 111.7-02.1 SN 1680
AJG 109 DB 123 1H 2321+585 SWIFT J2323.3+5849
BWE 2321+5832 2E 4724 H 2334+60 SWIFT J2323.2+5848
3C 461 2E 2321.1+5833 INTREF 1108 TeV J2323+588
3C 461.0 1ES 2321+58.5 NAME Cassiopeia A 2U 2321+58
4C 58.40 1FGL J2323.4+5849 NRAO 711 3U 2321+58
8C 2321+585 2FGL J2323.4+5849 PBC J2323.3+5849 4U 2321+58
3CR 461 3FGL J2323.4+5849 1RXS J232325.4+584838 W 81
CTA 105 1FHL J2323.3+5849 SNR G111.7-02.1 [DGW65] 148
CTB 110 2FHL J2323.4+5848 SN 1671 [KRL2007b] 402

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References (2414 between 1850 and 2020) (Total 2414)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).
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Collections of Measurements


distance : 1   

   

Observing logs


ISO : 98    XMM : 15    herschel : 29   

   


External archives :

Archive data at HEASARC - High-Energy Astrophysics Science Archive Research Center

Data at NED - NASA/IPAC Extragalactic Database : NAME Cas A

Link by name to the catalogue in VizieR :

BWE 2321+5832 3C 461 3C 461.0 4C 58.40 3CR 461
2E 4724 1RXS J232325.4+584838

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2020.07.13-06:41:04

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