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2024ApJ...973L..34A - Astrophys. J., 973, L34 (2024/September-3)

Observation of the Galactic Center PeVatron beyond 100 TeV with HAWC.

ALBERT A., ALFARO R., ALVAREZ C., ANDRES A., ARTEAGA-VELAZQUEZ J.C., AVILA ROJAS D., AYALA SOLARES H.A., BABU R., BELMONT-MORENO E., BERNAL A., CABALLERO-MORA K.S., CAPISTRAN T., CARRAMINANA A., CASANOVA S., COTTI U., COTZOMI J., COUTINO DE LEON S., DE LA FUENTE E., DE LEON C., DEPAOLI D., DI LALLA N., DIAZ HERNANDEZ R., DINGUS B.L., DUVERNOIS M.A., DIAZ-VELEZ J.C., ENGEL K., ERGIN T., ESPINOZA C., FAN K.L., FANG K., FRAIJA N., FRAIJA S., GARCIA-GONZALEZ J.A., GARFIAS F., GOKSU H., GONZALEZ M.M., GOODMAN J.A., GROETSCH S., HARDING J.P., HERNANDEZ-CADENA S., HERZOG I., HINTON J., HUANG D., HUEYOTL-ZAHUANTITLA F., HUMENSKY T.B., HUNTEMEYER P., IRIARTE A., KAUFMANN S., KIEDA D., LARA A., LEE W.H., LEE J., LEON VARGAS H., LINNEMANN J.T., LONGINOTTI A.L., LUIS-RAYA G., MALONE K., MARTINEZ O., MARTINEZ-CASTRO J., MATTHEWS J.A., MIRANDA-ROMAGNOLI P., MONTES J.A., MORALES-SOTO J.A., MORENO E., MOSTAFA M., NAJAFI M., NELLEN L., NEWBOLD M., NISA M.U., NORIEGA-PAPAQUI R., OLIVERA-NIETO L., OMODEI N., OSORIO-ARCHILA M., PEREZ ARAUJO Y., PEREZ-PEREZ E.G., RHO C.D., ROSA-GONZALEZ D., RUIZ-VELASCO E., SALAZAR H., SALAZAR-GALLEGOS D., SANDOVAL A., SCHNEIDER M., SCHWEFER G., SERNA-FRANCO J., SMITH A.J., SON Y., SPRINGER R.W., TIBOLLA O., TOLLEFSON K., TORRES I., TORRES-ESCOBEDO R., TURNER R., URENA-MENA F., VARELA E., WANG X., WANG Z., WATSON I.J., WILLOX E., WU H., YU S., YUN-CARCAMO S. and ZHOU H.

Abstract (from CDS):

We report an observation of ultrahigh-energy (UHE) gamma rays from the Galactic center (GC) region, using 7 yr of data collected by the High-Altitude Water Cherenkov (HAWC) Observatory. The HAWC data are best described as a point-like source (HAWC J1746-2856) with a power-law spectrum (${d}N/{d}E=\phi {\left(E/26\,\mathrm{TeV}\right)}^{\gamma }$), where γ = -2.88 ± 0.15stat - 0.1sys and ϕ = 1.5 × 10–15 (TeV cm2 s)–1$\pm {0.3}_{\mathrm{stat}}{\,}_{-{0.13}_{\mathrm{sys}}}^{+{0.08}_{\mathrm{sys}}}$ extending from 6 to 114 TeV. We find no evidence of a spectral cutoff up to 100 TeV using HAWC data. Two known point-like gamma-ray sources are spatially coincident with the HAWC gamma-ray excess: Sgr A* (HESS J1745-290) and the Arc (HESS J1746-285). We subtract the known flux contribution of these point sources from the measured flux of HAWC J1746-2856 to exclude their contamination and show that the excess observed by HAWC remains significant (>5σ), with the spectrum extending to >100 TeV. Our result supports that these detected UHE gamma rays can originate via hadronic interaction of PeV cosmic-ray protons with the dense ambient gas and confirms the presence of a proton PeVatron at the GC.

Abstract Copyright: © 2024. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Galactic center - Gamma-rays - Ultra-high-energy cosmic radiation

Simbad objects: 11

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