Possible Evidence for Cosmic-Ray Acceleration in the Type Ia SNR RCW 86: Spatial Correlation between TeV Gamma rays and Interstellar Atomic Protons

Abstract

We present a detailed morphological study of TeV gamma rays, synchrotron radiation, and interstellar gas in the young Type Ia supernova remnant (SNR) RCW 86. We find that the interstellar atomic gas shows good spatial correlation with the gamma rays, indicating that the TeV gamma rays from RCW 86 are likely to be dominantly of hadronic origin. In contrast, the spatial correlation between the interstellar molecular cloud and the TeV gamma rays is poor in the southeastern shell of the SNR. We argue that this poor correlation can be attributed to the low-energy cosmic rays (~ 1 TeV) not penetrating into the dense molecular cloud due to an enhancement of the turbulent magnetic field around the dense cloud of ~ 10-100 $\mu$G. We also find that the southwestern shell, which is bright in both synchrotron X-ray and radio continuum radiation, shows a significant gamma-ray excess compared with the interstellar proton column density, suggesting that leptonic gamma rays via inverse Compton scattering possibly contributes along with hadronic gamma rays. The total cosmic-ray energies of the young TeV gamma-ray SNRs$-$RX J1713.7$-$3946, Vela Jr, HESS J1731$-$347, and RCW 86$-$are roughly similar, which indicates that cosmic rays can be accelerated in both the core-collapse and Type Ia supernovae. The total energy of cosmic rays derived using the gas density, ~ 10${}^{48}$-10${}^{49}$ erg, gives a safe lower limit due mainly to the low filling factor of interstellar gas within the shell.

arXiv comment16 pages, 3 tables, 8 figures, published in The Astrophysical Journal (ApJ)

References in corpus (47)

• Planck 2013 results. XI. All-sky model of thermal dust emission
• On the magnetic fields and particle acceleration in Cas A
• Magnetic Field Amplification in Tycho and other Shell-type Supernova Remnants
• A detailed spectral and morphological study of the gamma-ray supernova remnant RX J1713.7-3946 with H.E.S.S
• Discovery of very high energy gamma-ray emission coincident with molecular clouds in the W28 (G6.4-0.1) field
• Toward Understanding the Cosmic-ray Acceleration at Young Supernova Remnants Interacting with Interstellar Clouds: Possible Applications to RX J1713.7-3946
• The Tully-Fisher relations of early-type spiral and S0 galaxies
• Turbulence and Magnetic Field Amplification in Supernova Remnants: Interactions Between A Strong Shock Wave and Multi-Phase Interstellar Medium
• Changes Of Dust Opacity With Density in the Orion A Molecular Cloud
• A Detailed Study of the Molecular and Atomic Gas Toward the γ-ray SNR RX J1713.7-3946: Spatial TeV γ-ray and ISM Gas Correspondence
• The X-ray synchrotron emission of RCW 86 and the implications for its age
• RCW 86: A Type Ia Supernova in a Wind-Blown Bubble
• H.E.S.S. observations of RX J1713.7-3946 with improved angular and spectral resolution; evidence for gamma-ray emission extending beyond the X-ray emitting shell
• Discovery of gamma-ray emission from the shell-type supernova remnant RCW 86 with H.E.S.S
• Gamma-Ray Observations of the Supernova Remnant RX J0852.0-4622 with the Fermi LAT
• Hadronic gamma-rays from RX J1713.7-3946?
• A Detailed Study of Molecular Clouds toward the TeV Gamma-Ray SNR G347.3-0.5
• X-Ray Synchrotron Emitting Fe-Rich Ejecta in SNR RCW 86
• Optically thick HI dominant in the local interstellar medium; an alternative interpretation to "dark gas"
• Star Forming Dense Cloud Cores in the TeV γ-ray SNR RX J1713.7-3946
• The many sides of RCW 86: a type Ia supernova remnant evolving in its progenitor's wind bubble
• Deeper H.E.S.S. observations of Vela Junior (RX J0852.0$-$4622): Morphology studies and resolved spectroscopy
• Spectral universality of strong shocks accelerating charged particles
• A detailed study of non-thermal X-ray properties and interstellar gas toward the γ-ray supernova remnant RX J1713.7-3946
• Interstellar protons in the TeV gamma-ray SNR HESS J1731-347:Possible evidence for the coexistence of hadronic and leptonic gamma-rays
• The high energy gamma-ray emission expected from Tycho's supernova remnant
• A detailed study of the interstellar protons toward the TeV $\gamma$-ray SNR RX J0852.0$-$4622 (G266.2$-$1.2, Vela Jr.); a third case of the $\gamma$-rays and ISM spatial correspondence
• HI, CO, and Dust in the Perseus Cloud
• Discovery of Molecular and Atomic Clouds Associated with the Magellanic Superbubble 30 Doradus C
• Detection of two TeV shell-type remnants at GeV energies with Fermi-LAT: HESS J1731-347 and SN 1006
• Suzaku Observation of the RCW86 Northeastern Shell
• Detailed spectral and morphological analysis of the shell type SNR RCW 86
• Discovery of molecular and atomic clouds associated with the gamma-ray supernova remnant Kesteven 79
• Deep morphological and spectral study of the SNR RCW 86 with Fermi-LAT
• Probing The Local Environment of the Supernova Remnant HESS J1731-347 with CO and CS Observations
• Synthetic Observations of 21cm HI Line Profiles from Inhomogeneous Turbulent Interstellar HI Gas with Magnetic Field
• Analysis of GeV-band gamma-ray emission from SNR RX J1713.7-3946
• Interstellar gas towards the TeV gamma-ray sources HESS J1640-465 and HESS J1641-463
• Dense Gas Towards the RXJ1713.7-3946 Supernova Remnant
• Interstellar gas towards CTB 37A and the TeV gamma-ray source HESS J1714-385
• Detection of GeV $\gamma$-ray emission in the direction of HESS J1731-347 with Fermi-LAT
• Dense molecular gas at 12 mm towards Galactic TeV gamma-ray sources
• A Morphological Study of the Supernova Remnant RX J0852.0-4622 (Vela Jr.)
• Molecular and Atomic Gas toward HESS J1745-303 in the Galactic Center: Further Support for the Hadronic Scenario
• Fine Structure of the Thermal and Non-Thermal X-Rays in the SN 1006 Shell
• A Systematic Study of the Thermal and Nonthermal Emission in the Supernova Remnant RCW 86 with Suzaku
• Searching for an interstellar medium association for HESS J1534-571

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