2021ApJ...907L..30A

Query : 2021ApJ...907L..30A

2021ApJ...907L..30A - Astrophys. J., 907, L30-L30 (2021/February-1)

Evidence of 200 TeV photons from HAWC J1825-134.

ALBERT A., ALFARO R., ALVAREZ C., ANGELES CAMACHO J.R., ARTEAGA-VELAZQUEZ J.C., ARUNBABU K.P., AVILA ROJAS D., AYALA SOLARES H.A., BAGHMANYAN V., BELMONT-MORENO E., BENZVI S.Y., BRISBOIS C., CAPISTRAN T., CARRAMINANA A., CASANOVA S., COTTI U., COTZOMI J., DE LA FUENTE E., DIAZ HERNANDEZ R., DINGUS B.L., DUVERNOIS M.A., DUROCHER M., DIAZ-VELEZ J.C., ENGEL K., ESPINOZA C., FANG K., FLEISCHHACK H., FRAIJA N., GALVAN-GAMEZ A., GARCIA D., GARCIA-GONZALEZ J.A., GARFIAS F., GIACINTI G., GONZALEZ M.M., GOODMAN J.A., HARDING J.P., HONA B., HUANG D., HUEYOTL-ZAHUANTITLA F., HUNTEMEYER P., IRIARTE A., JARDIN-BLICQ A., JOSHI V., KUNDE G.J., LARA A., LEE W.H., LEON VARGAS H., LINNEMANN J.T., LONGINOTTI A.L., LUIS-RAYA G., LUNDEEN J., MALONE K., MARANDON V., MARTINEZ O., MARTINEZ-CASTRO J., MATTHEWS J.A., MIRANDA-ROMAGNOLI P., MORENO E., MOSTAFA M., NAYERHODA A., NELLEN L., NEWBOLD M., NISA M.U., NORIEGA-PAPAQUI R., OMODEI N., PEISKER A., PEREZ ARAUJO Y., PEREZ-PEREZ E.G., RHO C.D., ROSA-GONZALEZ D., SALAZAR H., SALESA GREUS F., SANDOVAL A., SCHNEIDER M., SERNA F., SPRINGER R.W., TOLLEFSON K., TORRES I., TORRES-ESCOBEDO R., URENA-MENA F., VILLASENOR L., WILLOX E., ZHOU H. and DE LEON C.

Abstract (from CDS):

The Earth is bombarded by ultrarelativistic particles, known as cosmic rays (CRs). CRs with energies up to a few PeV (=1015 eV), the knee in the particle spectrum, are believed to have a Galactic origin. One or more factories of PeV CRs, or PeVatrons, must thus be active within our Galaxy. The direct detection of PeV protons from their sources is not possible since they are deflected in the Galactic magnetic fields. Hundred TeV γ-rays from decaying π0, produced when PeV CRs collide with the ambient gas, can provide the decisive evidence of proton acceleration up to the knee. Here we report the discovery by the High Altitude Water Cerenkov (HAWC) observatory of the γ-ray source, HAWC J1825-134, whose energy spectrum extends well beyond 200 TeV without a break or cutoff. The source is found to be coincident with a giant molecular cloud. The ambient gas density is as high as 700 protons cm–3. While the nature of this extreme accelerator remains unclear, CRs accelerated to energies of several PeV colliding with the ambient gas likely produce the observed radiation.

Abstract Copyright: © 2021. The American Astronomical Society. All rights reserved.

Journal keyword(s): Gamma-ray astronomy - Gamma-ray sources - Gamma-rays - Gamma-ray observatories

VizieR on-line data: <Available at CDS (J/ApJ/907/L30): fig2.dat>

Simbad objects: 13

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Number of rows : 13
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 [BDS2003] 99 OpC 17 18 59 -35 41.8           ~ 6 0
2 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
3 SNR G018.1-00.2 SNR 18 24 37.0 -13 15 18           ~ 48 1
4 eHWC J1825-134 gam 18 25.0 -13 26           ~ 21 0
5 AGAL G018.148-00.284 Cl* 18 25 01 -13 15.6           ~ 18 0
6 HAWC J1825-138 gam 18 25.5 -13 52           ~ 5 0
7 HAWC J1825-134 gam 18 25.8 -13 25           ~ 10 0
8 2HWC J1825-134 gam 18 25.8 -13 24           ~ 10 0
9 HAWC J1826-128 gam 18 26.0 -12 52           ~ 8 0
10 PSR J1826-1256 Psr 18 26 08.570 -12 56 33.53           ~ 152 1
11 PSR B1823-13 Psr 18 26 13.06 -13 34 48.1           ~ 460 1
12 V* V479 Sct HXB 18 26 15.0561548880 -14 50 54.247274304 12.02 12.23 11.27 11.04   ON6V((f))z 613 2
13 SNR G106.3+02.7 SNR 22 27.5 +60 50           ~ 99 1

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