HAWC Search for High-mass Microquasars

Albert, A. and Alfaro, R. and Alvarez, C. and Angeles Camacho, J. R. and Arteaga-Velázquez, J. C. and Arunbabu, K. P. and Avila Rojas, D. and Ayala Solares, H. A. and Baghmanyan, V. and Belmont-Moreno, E. and BenZvi, S. Y. and Brisbois, C. and Caballero-Mora, K. S. and Capistrán, T. and Carramiñana, A. and Casanova, S. and Cotti, U. and Cotzomi, J. and De la Fuente, E. and de León, C. and Diaz Hernandez, R. and Díaz-Vélez, J. C. and Dingus, B. L. and Durocher, M. and DuVernois, M. A. and Ellsworth, R. W. and Espinoza, C. and Fan, K. L. and Fang, K. and Fraija, N. and Galván-Gámez, A. and García-González, J. A. and Garfias, F. and González, M. M. and Goodman, J. A. and Harding, J. P. and Hernandez, S. and Hona, B. and Huang, D. and Hueyotl-Zahuantitla, F. and Hüntemeyer, P. and Iriarte, A. and Jardin-Blicq, A. and Joshi, V. and Kieda, D. and Lara, A. and Lee, J. and Lee, W. H. and León Vargas, H. and Linnemann, J. T. and Longinotti, A. L. and Luis-Raya, G. and Lundeen, J. and Malone, K. and Martinez, O. and Martínez-Castro, J. and Matthews, J. A. and Miranda-Romagnoli, P. and Morales-Soto, J. A. and Moreno, E. and Mostafá, M. and Nayerhoda, A. and Nellen, L. and Newbold, M. and Nisa, M. U. and Noriega-Papaqui, R. and Olivera-Nieto, L. and Omodei, N. and Peisker, A. and Pérez Araujo, Y. and Rho, C. D. and Roh, Y. J. and Rosa-González, D. and Salesa Greus, F. and Sandoval, A. and Schneider, M. and Serna-Franco, J. and Smith, A. J. and Springer, R. W. and Tollefson, K. and Torres, I. and Torres-Escobedo, R. and Turner, R. and Ureña-Mena, F. and Villaseñor, L. and Watson, I. J. and Weisgarber, T. and Willox, E. and Zhou, H. (2021) HAWC Search for High-mass Microquasars. The Astrophysical Journal Letters, 912 (1). L4. ISSN 2041-8205

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Abstract

Microquasars with high-mass companion stars are promising very high energy (VHE; 0.1–100 TeV) gamma-ray emitters, but their behaviors above 10 TeV are poorly known. Using the High Altitude Water Cerenkov (HAWC) observatory, we search for excess gamma-ray emission coincident with the positions of known high-mass microquasars (HMMQs). No significant emission is observed for LS 5039, Cyg X-1, Cyg X-3, and SS 433 with 1523 days of HAWC data. We set the most stringent limit above 10 TeV obtained to date on each individual source. Under the assumption that HMMQs produce gamma rays via a common mechanism, we have performed source-stacking searches, considering two different scenarios: (I) gamma-ray luminosity is a fraction epsilonγ of the microquasar jet luminosity, and (II) VHE gamma rays are produced by relativistic electrons upscattering the radiation field of the companion star in a magnetic field B. We obtain epsilonγ < 5.4 × 10−6 for scenario I, which tightly constrains models that suggest observable high-energy neutrino emission by HMMQs. In the case of scenario II, the nondetection of VHE gamma rays yields a strong magnetic field, which challenges synchrotron radiation as the dominant mechanism of the microquasar emission between 10 keV and 10 MeV.

Item Type: Article
Subjects: Research Scholar Guardian > Physics and Astronomy
Depositing User: Unnamed user with email support@scholarguardian.com
Date Deposited: 12 May 2023 08:45
Last Modified: 07 Feb 2024 04:30
URI: http://science.sdpublishers.org/id/eprint/807

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