2021ApJ...919L..22C


Query : 2021ApJ...919L..22C

2021ApJ...919L..22C - Astrophys. J., 919, L22-L22 (2021/October-1)

Discovery of the ultrahigh-energy gamma-ray source LHAASO J2108+5157.

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 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., DAN-ZENG-LUO-BU D.-Z., 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 an ultrahigh-energy (UHE) gamma-ray source, LHAASO J2108+5157, by analyzing the LHAASO-KM2A data of 308.33 live days. A significant excess of gamma ray-induced showers is observed in both energy bands of 25-100 and >100 TeV with 9.5σ and 8.5σ, respectively. This source is not significantly favored as an extended source with an angular extension smaller than the point-spread function of KM2A. The measured energy spectrum from 20 to 200 TeV can be approximately described by a power-law function with an index of -2.83 ± 0.18stat. A harder spectrum is demanded at lower energies considering the flux upper limit set by Fermi-LAT observations. The position of the gamma-ray emission is correlated with a giant molecular cloud, which favors a hadronic origin. No obvious counterparts have been found, and deeper multiwavelength observations will help to cast new light on this intriguing UHE source.

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

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

Simbad objects: 9

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Number of rows : 9
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 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
3 SNR G006.4-00.1 SNR 18 00 31.2011719 -23 25 48.001099           ~ 782 1
4 [MML2017] 2870 MoC 21 07 04.184 +52 10 15.47           ~ 3 0
5 V* V1061 Cyg SB* 21 07 20.5201575864 +52 02 58.418010528   9.78 9.21     F8 84 0
6 1FGL J2107.5+5202c Bz? 21 08 04.0 +51 55 39           ~ 39 0
7 [MML2017] 4607 MoC 21 09 01.244 +51 52 59.66           ~ 7 0
8 DSH J2109.5+5223 OpC 21 09 30.4 +52 23 41           ~ 9 1
9 DSH J2111.8+5222 OpC 21 11 50.5 +52 22 48           ~ 17 0

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