2000ApJ...532..302A

Query : 2000ApJ...532..302A

2000ApJ...532..302A - Astrophys. J., 532, 302-307 (2000/March-3)

Detection of Multi-TeV gamma rays from Markarian 501 during an unforeseen flaring state in 1997 with the tibet air shower array.

AMENOMORI M., AYABE S., CAO P.Y., DANZENGLUOBU, DING L.K., FENG Z.Y., FU Y., GUO H.W., HE M., HIBINO K., HOTTA N., HUANG Q., HUO A.X., IZU K., JIA H.Y., KAJINO F., KASAHARA K., KATAYOSE Y., LABACIREN Y., LI J.Y., LU H., LU S.L., LUO G.X., MENG X.R., MIZUTANI K., MU J., NANJO H., NISHIZAWA M., OHNISHI M., OHTA I., OUCHI T., REN J.R., SAITO T., SAKATA M., SASAKI T., SHI Z.Z., SHIBATA M., SHIOMI A., SHIRAI T., SUGIMOTO H., TAIRA K., TAN Y.H., TATEYAMA N., TORII S., UTSUGI T., WANG C.R., WANG H., XU X.W., YAMAMOTO Y., YU G.C., YUAN A.F., YUDA T., ZHANG C.S., ZHANG H.M., ZHANG J.L., ZHANG N.J., ZHANG X.Y., ZHAXISANGZHU, ZHAXICIREN, ZHOU W.D. (The Tibet AS{gamma} Collaboration)

Abstract (from CDS):

In 1997, the BL Lac object Mrk 501 entered a very active phase and was the brightest source in the sky at TeV energies, showing strong and frequent flaring. Using the data obtained with a high-density air shower array that has been operating successfully at Yangbajing in Tibet since 1996, we searched for γ-ray signals from this source during the period in 1997 from February through August. Our observation detected multi-TeV γ-ray signals at the 3.7 σ level during this period. The most rapid increase in the excess counts was observed between April 7 and June 16, and the statistical significance of the excess counts in this period was 4.7 σ. Among several observations of flaring TeV γ-rays from Mrk 501 in 1997, this is the only observation using a conventional air shower array. We present the energy spectrum of γ-rays, which will be worth comparing with those obtained by imaging atmospheric Cerenkov telescopes.

Abstract Copyright: ∼

Journal keyword(s): BL Lacertae objects: individual (Markarian 501) - Gamma Rays: Observations

Simbad objects: 4

Full paper

View the references in ADS

Number of rows : 4

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Mag R	Sp type	#ref 1850 - 2026	#notes
1	M 1	SNR	05 34 31.8	+22 01 03					~	6516	1
2	V* CM Tau	Psr	05 34 31.9474694616	+22 00 52.153698024					~	5476	0
3	Z 184-50	BLL	11 04 27.3140835504	+38 12 31.798495872		13.50	12.90	8.31	~	2841	1
4	Z 225-7	BLL	16 53 52.21668403	+39 45 36.6088754	14.09	14.15	13.29	8.26	~	2304	2

To bookmark this query, right click on this link: simbad:objects in 2000ApJ...532..302A and select 'bookmark this link' or equivalent in the popup menu