HAWC J2227+610: a potential PeVatron candidate for the CTA in the northern hemisphere

The Cherenkov Telescope Array Consortium

HAWC J2227+610: a potential PeVatron candidate for the CTA in the northern hemisphere

The Cherenkov Telescope Array Consortium

Physics

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Research output: Contribution to journal › Conference article › peer-review

Abstract

Recent observations of the gamma-ray source HAWC J2227+610 by Tibet AS+MD and LHAASO confirm the special interest of this source as a galactic PeVatron candidate in the northern hemisphere. HAWC J2227+610 emits Very High Energy (VHE) gamma-rays up to 500 TeV, from a region coincident with molecular clouds and significantly displaced from the nearby pulsar J2229+6114. Even if this morphology favours an hadronic origin, both leptonic or hadronic models can describe the current VHE gamma-ray emission. The morphology of the source is not well constrained by the present measurements and a better characterisation would greatly help the understanding of the underlying particle acceleration mechanisms. The Cherenkov Telescope Array (CTA) will be the future most sensitive Imaging Atmospheric Cherenkov Telescope and, thanks to its unprecedented angular resolution, could contribute to better constrain the nature of this source. The present work investigates the potentiality of CTA to study the morphology and the spectrum of HAWC J2227+610. For this aim, the source is simulated assuming the hadronic model proposed by the Tibet AS+MD collaboration, recently fitted on multi-wavelength data, and two spatial templates associated to the source nearby molecular clouds. Different CTA layouts and observation times are considered. A 3D map based analysis shows that CTA is able to significantly detect the extension of the source and to attribute higher detection significance to the simulated molecular cloud template compared to the alternative one. CTA data does not allow to disentangle the hadronic and the leptonic emission models. However, it permits to correctly reproduce the simulated parent proton spectrum characterized by a ∼ 500 TeV cutoff.

Original language	English
Article number	904
Journal	Proceedings of Science
Volume	395
Publication status	Published - 18 Mar 2022
Event	37th International Cosmic Ray Conference, ICRC 2021 - Virtual, Berlin, Germany Duration: 12 Jul 2021 → 23 Jul 2021

ASJC Scopus subject areas

Multidisciplinary

Cite this

@article{7d0ed928c2e04780b3e1de44e3d23317,

title = "HAWC J2227+610: a potential PeVatron candidate for the CTA in the northern hemisphere",

abstract = "Recent observations of the gamma-ray source HAWC J2227+610 by Tibet AS+MD and LHAASO confirm the special interest of this source as a galactic PeVatron candidate in the northern hemisphere. HAWC J2227+610 emits Very High Energy (VHE) gamma-rays up to 500 TeV, from a region coincident with molecular clouds and significantly displaced from the nearby pulsar J2229+6114. Even if this morphology favours an hadronic origin, both leptonic or hadronic models can describe the current VHE gamma-ray emission. The morphology of the source is not well constrained by the present measurements and a better characterisation would greatly help the understanding of the underlying particle acceleration mechanisms. The Cherenkov Telescope Array (CTA) will be the future most sensitive Imaging Atmospheric Cherenkov Telescope and, thanks to its unprecedented angular resolution, could contribute to better constrain the nature of this source. The present work investigates the potentiality of CTA to study the morphology and the spectrum of HAWC J2227+610. For this aim, the source is simulated assuming the hadronic model proposed by the Tibet AS+MD collaboration, recently fitted on multi-wavelength data, and two spatial templates associated to the source nearby molecular clouds. Different CTA layouts and observation times are considered. A 3D map based analysis shows that CTA is able to significantly detect the extension of the source and to attribute higher detection significance to the simulated molecular cloud template compared to the alternative one. CTA data does not allow to disentangle the hadronic and the leptonic emission models. However, it permits to correctly reproduce the simulated parent proton spectrum characterized by a ∼ 500 TeV cutoff.",

author = "\{The Cherenkov Telescope Array Consortium\} and H. Abdalla and H. Abe and S. Abe and A. Abusleme and F. Acero and A. Acharyya and \{Ac{\'i}n Portella\}, V. and K. Ackley and R. Adam and C. Adams and Adhikari, \{S. S.\} and I. Aguado-Ruesga and I. Agudo and R. Aguilera and A. Aguirre-Santaella and F. Aharonian and A. Alberdi and R. Alfaro and J. Alfaro and C. Alispach and R. Aloisio and \{Alves Batista\}, R. and Amans, \{J. P.\} and L. Amati and E. Amato and L. Ambrogi and G. Ambrosi and M. Ambrosio and R. Ammendola and J. Anderson and M. Anduze and Ang{\"u}ner, \{E. O.\} and Antonelli, \{L. A.\} and V. Antonuccio and P. Antoranz and R. Anutarawiramkul and \{Aragunde Gutierrez\}, J. and C. Aramo and A. Araudo and M. Araya and A. Arbet-Engels and C. Arcaro and V. Arendt and C. Armand and T. Armstrong and F. Arqueros and L. Arrabito and B. Arsioli and M. Artero and S. Razzaque",

note = "Publisher Copyright: {\textcopyright} Copyright owned by the author(s) under the terms of the Creative Commons.; 37th International Cosmic Ray Conference, ICRC 2021 ; Conference date: 12-07-2021 Through 23-07-2021",

year = "2022",

month = mar,

day = "18",

language = "English",

volume = "395",

journal = "Proceedings of Science",

issn = "1824-8039",

publisher = "Sissa Medialab Srl",

}

TY - JOUR

T1 - HAWC J2227+610

T2 - 37th International Cosmic Ray Conference, ICRC 2021

AU - The Cherenkov Telescope Array Consortium

AU - Abdalla, H.

AU - Abe, H.

AU - Abe, S.

AU - Abusleme, A.

AU - Acero, F.

AU - Acharyya, A.

AU - Acín Portella, V.

AU - Ackley, K.

AU - Adam, R.

AU - Adams, C.

AU - Adhikari, S. S.

AU - Aguado-Ruesga, I.

AU - Agudo, I.

AU - Aguilera, R.

AU - Aguirre-Santaella, A.

AU - Aharonian, F.

AU - Alberdi, A.

AU - Alfaro, R.

AU - Alfaro, J.

AU - Alispach, C.

AU - Aloisio, R.

AU - Alves Batista, R.

AU - Amans, J. P.

AU - Amati, L.

AU - Amato, E.

AU - Ambrogi, L.

AU - Ambrosi, G.

AU - Ambrosio, M.

AU - Ammendola, R.

AU - Anderson, J.

AU - Anduze, M.

AU - Angüner, E. O.

AU - Antonelli, L. A.

AU - Antonuccio, V.

AU - Antoranz, P.

AU - Anutarawiramkul, R.

AU - Aragunde Gutierrez, J.

AU - Aramo, C.

AU - Araudo, A.

AU - Araya, M.

AU - Arbet-Engels, A.

AU - Arcaro, C.

AU - Arendt, V.

AU - Armand, C.

AU - Armstrong, T.

AU - Arqueros, F.

AU - Arrabito, L.

AU - Arsioli, B.

AU - Artero, M.

AU - Razzaque, S.

PY - 2022/3/18

Y1 - 2022/3/18

N2 - Recent observations of the gamma-ray source HAWC J2227+610 by Tibet AS+MD and LHAASO confirm the special interest of this source as a galactic PeVatron candidate in the northern hemisphere. HAWC J2227+610 emits Very High Energy (VHE) gamma-rays up to 500 TeV, from a region coincident with molecular clouds and significantly displaced from the nearby pulsar J2229+6114. Even if this morphology favours an hadronic origin, both leptonic or hadronic models can describe the current VHE gamma-ray emission. The morphology of the source is not well constrained by the present measurements and a better characterisation would greatly help the understanding of the underlying particle acceleration mechanisms. The Cherenkov Telescope Array (CTA) will be the future most sensitive Imaging Atmospheric Cherenkov Telescope and, thanks to its unprecedented angular resolution, could contribute to better constrain the nature of this source. The present work investigates the potentiality of CTA to study the morphology and the spectrum of HAWC J2227+610. For this aim, the source is simulated assuming the hadronic model proposed by the Tibet AS+MD collaboration, recently fitted on multi-wavelength data, and two spatial templates associated to the source nearby molecular clouds. Different CTA layouts and observation times are considered. A 3D map based analysis shows that CTA is able to significantly detect the extension of the source and to attribute higher detection significance to the simulated molecular cloud template compared to the alternative one. CTA data does not allow to disentangle the hadronic and the leptonic emission models. However, it permits to correctly reproduce the simulated parent proton spectrum characterized by a ∼ 500 TeV cutoff.

AB - Recent observations of the gamma-ray source HAWC J2227+610 by Tibet AS+MD and LHAASO confirm the special interest of this source as a galactic PeVatron candidate in the northern hemisphere. HAWC J2227+610 emits Very High Energy (VHE) gamma-rays up to 500 TeV, from a region coincident with molecular clouds and significantly displaced from the nearby pulsar J2229+6114. Even if this morphology favours an hadronic origin, both leptonic or hadronic models can describe the current VHE gamma-ray emission. The morphology of the source is not well constrained by the present measurements and a better characterisation would greatly help the understanding of the underlying particle acceleration mechanisms. The Cherenkov Telescope Array (CTA) will be the future most sensitive Imaging Atmospheric Cherenkov Telescope and, thanks to its unprecedented angular resolution, could contribute to better constrain the nature of this source. The present work investigates the potentiality of CTA to study the morphology and the spectrum of HAWC J2227+610. For this aim, the source is simulated assuming the hadronic model proposed by the Tibet AS+MD collaboration, recently fitted on multi-wavelength data, and two spatial templates associated to the source nearby molecular clouds. Different CTA layouts and observation times are considered. A 3D map based analysis shows that CTA is able to significantly detect the extension of the source and to attribute higher detection significance to the simulated molecular cloud template compared to the alternative one. CTA data does not allow to disentangle the hadronic and the leptonic emission models. However, it permits to correctly reproduce the simulated parent proton spectrum characterized by a ∼ 500 TeV cutoff.

UR - https://www.scopus.com/pages/publications/85145018821

M3 - Conference article

AN - SCOPUS:85145018821

SN - 1824-8039

VL - 395

JO - Proceedings of Science

JF - Proceedings of Science

M1 - 904

Y2 - 12 July 2021 through 23 July 2021

ER -

HAWC J2227+610: a potential PeVatron candidate for the CTA in the northern hemisphere

Abstract

ASJC Scopus subject areas

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