Long-term Spectra of the Blazars Mrk 421 and Mrk 501 at TeV Energies Seen by HAWC

Albert A, Alfaro R, Alvarez C, Angeles Camacho JR, Arteaga-Velazquez JC, Arunbabu KP, Avila Rojas D, Ayala Solares HA, Baghmanyan , Belmont-Moreno E, Caballero-Mora KS, Capistran T, Carraminana A, Casanova S, Cotti U, Cotzomi J, Coutino De Leon S, De La Fuente E, Diaz Hernandez R, Duvernois MA, Durocher M, Diaz-Velez JC, Engel K, Espinoza C, Fan KL, Alonso MF, Fraija N, Garcia D, Garcia-Gonzalez JA, Garfias F, Gonzalez MM, Goodman JA, Harding JP, Hona B, Huang D, Hueyotl-Zahuantitla F, Huntemeyer P, Iriarte A, Joshi V, Lara A, Lee WH, Lee J, Vargas HL, Linneman JT, Longinotti AL, Luis-Raya G, Malone K, Martinez O, Martinez-Castro J, Matthews JA, Miranda-Romagnoli P, Moreno E, Mostafa M, Nayerhoda A, Nellen L, Newbold M, Noriega-Papaqui R, Peisker A, Perez Araujo Y, Perez-Perez EG, Rho CD, Rosa-Gonzalez D, Salazar H, Salesa Greus F, Sandoval A, Schneider M, Serna-Franco J, Smith AJ, Springer RW, Tollefson K, Torres , Torres-Escobedo R, Urena-Mena F, Villasenor L, Wang X, Weisgarber T, Willox E, Zhou H, De Leon C (2022)

Publication Type: Journal article

Publication year: 2022

Journal

Book Volume: 929

Journal Issue: 2

DOI: 10.3847/1538-4357/ac58f6

Abstract

The High Altitude Water Cherenkov (HAWC) Gamma-Ray Observatory surveys the very high-energy sky in the 300 GeV to >100 TeV energy range. HAWC has detected two blazars above 11 sigma, Markarian 421 (Mrk 421) and Markarian 501 (Mrk 501). The observations are comprised of data taken in the period between 2015 June and 2018 July, resulting in similar to 1038 days of exposure. In this work, we report the time-averaged spectral analyses for both sources, above 0.5 TeV. Taking into account the flux attenuation due to the extragalactic background light, the intrinsic spectrum of Mrk 421 is described by a power law with an exponential energy cutoff with index alpha = 2.26 +/- (0.12)(stat)((+0.17)(-0.2))(sys) and energy cutoff E-c = 5.1 +/- (1.6)(stat)((+1.4)(-2.5))(sys) TeV, while the intrinsic spectrum of Mrk 501 is better described by a simple power law with index alpha = 2.61 +/- (0.11)(stat)((+)(0.01)(-0.07))(sys). The maximum energies at which the Mrk 421 and Mrk 501 signals are detected are 9 and 12 TeV, respectively. This makes these some of the highest energy detections to date for spectra averaged over years-long timescales. Since the observation of gamma radiation from blazars provides information about the physical processes that take place in their relativistic jets, it is important to study the broadband spectral energy distributions (SEDs) of these objects. For this purpose, contemporaneous data in the gamma-ray band to the X-ray range, and literature data in the radio to UV range, were used to build time-averaged SEDs that were modeled within a synchrotron-self Compton leptonic scenario.

Authors with CRIS profile

Involved external institutions

Michigan Technological University United States (USA) (US) National Autonomous University of Mexico / Universidad Nacional Autónoma de México (UNAM) Mexico (MX) Universidad de Guadalajara (UDEG) Mexico (MX) Los Alamos National Laboratory United States (USA) (US) Universidad Autónoma de Chiapas (UNACH) Mexico (MX) Pennsylvania State University (Penn State) United States (USA) (US) Polska Akademia Nauk (PAN) / Polish Academy of Sciences Poland (PL) University of Wisconsin - Madison United States (USA) (US) Universidad Michoacana de San Nicolás de Hidalgo (UMSNH) Mexico (MX) University of Maryland United States (USA) (US) Benemérita Universidad Autónoma de Puebla (BUAP) / Meritorious Autonomous University of Puebla Mexico (MX) University of Utah United States (USA) (US) University of Seoul (UOS) / 서울시립대학교 Korea, Republic of (KR) National Polytechnic Institute of Mexico / Instituto Politécnico Nacional de México Mexico (MX) Universidad Politécnica de Pachuca (UPP) Mexico (MX) University of New Mexico (UNM) / Universidad de Nuevo México United States (USA) (US) Autonomous University of the State of Hidalgo / Universidad Autónoma del Estado de Hidalgo Mexico (MX) National Institute for Astrophysics / Istituto Nazionale Astrofisica (INAF) Italy (IT) Tecnológico de Monterrey (ITESM) Mexico (MX) Michigan State University United States (USA) (US) Shanghai Jiao Tong University / 上海交通大学 China (CN)

How to cite

APA:

Albert, A., Alfaro, R., Alvarez, C., Angeles Camacho, J.R., Arteaga-Velazquez, J.C., Arunbabu, K.P.,... De Leon, C. (2022). Long-term Spectra of the Blazars Mrk 421 and Mrk 501 at TeV Energies Seen by HAWC. Astrophysical Journal, 929(2). https://dx.doi.org/10.3847/1538-4357/ac58f6

MLA:

Albert, A., et al. "Long-term Spectra of the Blazars Mrk 421 and Mrk 501 at TeV Energies Seen by HAWC." Astrophysical Journal 929.2 (2022).

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