2021ApJ...917L...4C

Query : 2021ApJ...917L...4C

2021ApJ...917L...4C - Astrophys. J., 917, L4-L4 (2021/August-2)

Discovery of a new gamma-ray source, LHAASO J0341+5258 with emission up to 200 TeV.

CAO Z., AHARONIAN F., AN Q., AXIKEGU, BAI L.X., BAI Y.X., BAO Y.W., BASTIERI D., BI X.J., BI Y.J., CAI H., CAI J.T., CAO Z., CHANG J., CHANG J.F., CHEN B.M., CHEN E.S., CHEN J., CHEN L., CHEN L., CHEN L., CHEN M.J., CHEN M.L., CHEN Q.H., CHEN S.H., CHEN S.Z., CHEN T.L., CHEN X.L., CHEN Y., CHENG N., CHENG Y.D., CUI S.W., CUI X.H., CUI Y.D., D'ETTORRE PIAZZOLI B., DAI B.Z., DAI H.L., DAI Z.G., DANZENGLUOBU, DELLA VOLPE D., DONG X.J., DUAN K.K., FAN J.H., FAN Y.Z., FAN Z.X., FANG J., FANG K., FENG C.F., FENG L., FENG S.H., FENG Y.L., GAO B., GAO C.D., GAO L.Q., GAO Q., GAO W., GE M.M., GENG L.S., GONG G.H., GOU Q.B., GU M.H., GUO F.L., GUO J.G., GUO X.L., GUO Y.Q., GUO Y.Y., HAN Y.A., HE H.H., HE H.N., HE J.C., HE S.L., HE X.B., HE Y., HELLER M., HOR Y.K., HOU C., HU H.B., HU S., HU S.C., HU X.J., HUANG D.H., HUANG Q.L., HUANG W.H., HUANG X.T., HUANG X.Y., HUANG Z.C., JI F., JI X.L., JIA H.Y., JIANG K., JIANG Z.J., JIN C., KE T., KULESHOV D., LEVOCHKIN K., LI B.B., LI C., LI C., LI F., LI H.B., LI H.C., LI H.Y., LI J., LI K., LI W.L., LI X.R., LI X., LI X., LI Y., LI Y.Z., LI Z., LI Z., LIANG E.W., LIANG Y.F., LIN S.J., LIU B., LIU C., LIU D., LIU H., LIU H.D., LIU J., LIU J.L., LIU J.S., LIU J.Y., LIU M.Y., LIU R.Y., LIU S.M., LIU W., LIU Y., LIU Y.N., LIU Z.X., LONG W.J., LU R., LV H.K., MA B.Q., MA L.L., MA X.H., MAO J.R., MASOOD A., MIN Z., MITTHUMSIRI W., MONTARULI T., NAN Y.C., PANG B.Y., PATTARAKIJWANICH P., PEI Z.Y., QI M.Y., QI Y.Q., QIAO B.Q., QIN J.J., RUFFOLO D., RULEV V., SAIZ A., SHAO L., SHCHEGOLEV O., SHENG X.D., SHI J.Y., SONG H.C., STENKIN Y.V., STEPANOV V., SU Y., SUN Q.N., SUN X.N., SUN Z.B., TAM P.H.T., TANG Z.B., TIAN W.W., WANG B.D., WANG C., WANG H., WANG H.G., WANG J.C., WANG J.S., WANG L.P., WANG L.Y., WANG R.N., WANG W., WANG W., WANG X.G., WANG X.J., WANG X.Y., WANG Y., WANG Y.D., WANG Y.J., WANG Y.P., WANG Z.H., WANG Z.X., WANG Z., WANG Z., WEI D.M., WEI J.J., WEI Y.J., WEN T., WU C.Y., WU H.R., WU S., WU W.X., WU X.F., XI S.Q., XIA J., XIA J.J., XIANG G.M., XIAO D.X., XIAO G., XIAO H.B., XIN G.G., XIN Y.L., XING Y., XU D.L., XU R.X., XUE L., YAN D.H., YAN J.Z., YANG C.W., YANG F.F., YANG J.Y., YANG L.L., YANG M.J., YANG R.Z., YANG S.B., YAO Y.H., YAO Z.G., YE Y.M., YIN L.Q., YIN N., YOU X.H., YOU Z.Y., YU Y.H., YUAN Q., ZENG H.D., ZENG T.X., ZENG W., ZENG Z.K., ZHA M., ZHAI X.X., ZHANG B.B., ZHANG H.M., ZHANG H.Y., ZHANG J.L., ZHANG J.W., ZHANG L.X., ZHANG L., ZHANG L., ZHANG P.F., ZHANG P.P., ZHANG R., ZHANG S.R., ZHANG S.S., ZHANG X., ZHANG X.P., ZHANG Y.F., ZHANG Y.L., ZHANG Y., ZHANG Y., ZHAO B., ZHAO J., ZHAO L., ZHAO L.Z., ZHAO S.P., ZHENG F., ZHENG Y., ZHOU B., ZHOU H., ZHOU J.N., ZHOU P., ZHOU R., ZHOU X.X., ZHU C.G., ZHU F.R., ZHU H., ZHU K.J. and ZUO X.

Abstract (from CDS):

We report the discovery of a new unidentified extended γ-ray source in the Galactic plane named LHAASO J0341+5258 with a pretrial significance of 8.2 standard deviations above 25 TeV. The best-fit position is R.A. = 55.°34 ± 0.°11 and decl. = 52.°97 ± 0.°07. The angular size of LHAASO J0341+5258 is 0.°29 ± 0.°06stat ± 0.°02sys. The flux above 25 TeV is about 20% of the flux of the Crab Nebula. Although a power-law fit of the spectrum from 10 to 200 TeV with the photon index α = 2.98 ± 0.19stat ± 0.02sys is not excluded, the LHAASO data together with the flux upper limit at 10 GeV set by the Fermi-LAT observation, indicate a noticeable steepening of an initially hard power-law spectrum with a cutoff at ≃50 TeV. We briefly discuss the origin of ultra-high-energy gamma rays. The lack of an energetic pulsar and a young supernova remnant inside or in the vicinity of LHAASO J0341+5258 challenge, but do not exclude, both the leptonic and hadronic scenarios of gamma-ray production.

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

Journal keyword(s): Particle astrophysics

Simbad objects: 8

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Number of rows : 8
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 1LHAASO J0339+5307 gam 03 39.2 +53 08           ~ 8 0
2 2RXS J033928.5+530720 X 03 39 28.5240 +53 07 20.892           ~ 2 0
3 1FGL J0341.5+5304 gam 03 40 26.4 +53 02 11           ~ 22 0
4 2RXS J034125.8+525530 X 03 41 25.8840 +52 55 30.000           ~ 3 0
5 2RXS J034203.0+532329 X 03 42 03.0768 +53 23 29.076           ~ 2 0
6 PSR B0339+53 Psr 03 43 12.90 +53 12 53.4           ~ 38 0
7 2RXS J034316.5+524331 X 03 43 16.5768 +52 43 31.476           ~ 2 0
8 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0

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