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2017ApJ...841..100A - Astrophys. J., 841, 100-100 (2017/June-1)

Daily monitoring of TeV gamma-ray emission from Mrk 421, Mrk 501, and the Crab Nebula with HAWC.

ABEYSEKARA A.U., ALBERT A., ALFARO R., ALVAREZ C., ALVAREZ J.D., ARCEO R., ARTEAGA-VELAZQUEZ J.C., AVILA ROJAS D., AYALA SOLARES H.A., BARBER A.S., BAUTISTA-ELIVAR N., BECERRA GONZALEZ J., BECERRIL A., BELMONT-MORENO E., BENZVI S.Y., BERNAL A., BRAUN J., BRISBOIS C., CABALLERO-MORA K.S., CAPISTRAN T., CARRAMINANA A., CASANOVA S., CASTILLO M., COTTI U., COTZOMI J., COUTINO DE LEON S., DE LEON C., DE LA FUENTE E., DIAZ HERNANDEZ R., DINGUS B.L., DUVERNOIS M.A., DIAZ-VELEZ J.C., ELLSWORTH R.W., ENGEL K., FIORINO D.W., FRAIJA N., GARCIA-GONZALEZ J.A., GARFIAS F., GERHARDT M., GONZALEZ MUNOZ A., GONZALEZ M.M., GOODMAN J.A., HAMPEL-ARIAS Z., HARDING J.P., HERNANDEZ S., HERNANDEZ-ALMADA A., HONA B., HUI C.M., HUNTEMEYER P., IRIARTE A., JARDIN-BLICQ A., JOSHI V., KAUFMANN S., KIEDA D., LARA A., LAUER R.J., LEE W.H., LENNARZ D., LEON VARGAS H., LINNEMANN J.T., LONGINOTTI A.L., LUIS RAYA G., LUNA-GARCIA R., LOPEZ-COTO R., MALONE K., MARINELLI S.S., MARTINEZ O., MARTINEZ-CASTELLANOS I., MARTINEZ-CASTRO J., MATTHEWS J.A., MIRANDA-ROMAGNOLI P., MORENO E., MOSTAFA M., NELLEN L., NEWBOLD M., NISA M.U., NORIEGA-PAPAQUI R., PRETZ J., PEREZ-PEREZ E.G., REN Z., RHO C.D., RIVIERE C., ROSA-GONZALEZ D., ROSENBERG M., RUIZ-VELASCO E., SALESA GREUS F., SANDOVAL A., SCHNEIDER M., SCHOORLEMMER H., SINNIS G., SMITH A.J., SPRINGER R.W., SURAJBALI P., TABOADA I., TIBOLLA O., TOLLEFSON K., TORRES I., UKWATTA T.N., VIANELLO G., WEISGARBER T., WESTERHOFF S., WISHER I.G., WOOD J., YAPICI T., YOUNK P.W., ZEPEDA A. and ZHOU H.

Abstract (from CDS):

We present results from daily monitoring of gamma-rays in the energy range from ∼0.5 to ∼100 TeV with the first 17 months of data from the High Altitude Water Cherenkov (HAWC) Observatory. Its wide field of view of 2 steradians and duty cycle of 95% are unique features compared to other TeV observatories that allow us to observe every source that transits over HAWC for up to ∼6 hr each sidereal day. This regular sampling yields unprecedented light curves from unbiased measurements that are independent of seasons or weather conditions. For the Crab Nebula as a reference source, we find no variability in the TeV band. Our main focus is the study of the TeV blazars Markarian (Mrk) 421 and Mrk 501. A spectral fit for Mrk 421 yields a power-law index Γ=2.21±0.14stat±0.20sys and an exponential cut-off E0=5.4±1.1stat±1.0sys TeV. For Mrk 501, we find an index Γ=1.60±0.30stat±0.20sys and exponential cut-off E0=5.7±1.6stat±1.0sys TeV. The light curves for both sources show clear variability and a Bayesian analysis is applied to identify changes between flux states. The highest per-transit fluxes observed from Mrk 421 exceed the Crab Nebula flux by a factor of approximately five. For Mrk 501, several transits show fluxes in excess of three times the Crab Nebula flux. In a comparison to lower energy gamma-ray and X-ray monitoring data with comparable sampling, we cannot identify clear counterparts for the most significant flaring features observed by HAWC.

Abstract Copyright: © 2017. The American Astronomical Society. All rights reserved.

Journal keyword(s): acceleration of particles - BL Lacertae objects: individual: (Mrk 421, Mrk 501) - galaxies: active - gamma rays: general - ISM: individual objects: Crab Nebula - ISM: individual objects: Crab Nebula

Simbad objects: 3

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