2024ApJ...973L..34A

Query : 2024ApJ...973L..34A

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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Number of rows : 11
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 M 1 SNR 05 34 31.8 +22 01 03           ~ 6516 1
2 3FHL J1746.2-2852 LXB 17 44 33.09 -28 44 27.0           ~ 559 0
3 HAWC J1746-285 gam 17 45.1 -28 56           ~ 1 0
4 2CG 359+00 gam 17 45 11 -30 11.9           ~ 104 0
5 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
6 NAME Sgr A* X 17 45 40.03599 -29 00 28.1699           ~ 4970 3
7 NAME Arches Cluster Cl* 17 45 50.5 -28 49 28           ~ 792 0
8 NAME Quintuplet Cluster OpC 17 46 13.9 -28 49 48           ~ 561 0
9 NAME Galactic Center Radio Arc Rad 17 46 16.9 -28 48 52           ~ 132 0
10 SNR G000.9+00.1 SNR 17 47.3 -28 09           ~ 222 1
11 NAME Galactic Ridge ? ~ ~           ~ 543 1

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