2007ApJ...663..125A

Query : 2007ApJ...663..125A

2007ApJ...663..125A - Astrophys. J., 663, 125-138 (2007/July-1)

Observations of Markarian 421 with the MAGIC telescope.

ALBERT J., ALIU E., ANDERHUB H., ANTORANZ P., ARMADA A., ASENSIO M., BAIXERAS C., BARRIO J.A., BARTKO H., BASTIERI D., BECKER J., BEDNAREK W., BERGER K., BIGONGIARI C., BILAND A., BOCK R.K., BORDAS P., BOSCH-RAMON V., BRETZ T., BRITVITCH I., CAMARA M., CARMONA E., CHILINGARIAN A., CIPRINI S., COARASA J.A., COMMICHAU S., CONTRERAS J.L., CORTINA J., CURTEF V., DANIELYAN V., DAZZI F., DE ANGELIS A., DE LOS REYES R., DE LOTTO B., DOMINGO-SANTAMARIA E., DORNER D., DORO M., ERRANDO M., FAGIOLINI M., FERENC D., FERNANDEZ E., FIRPO R., FLIX J., FONSECA M.V., FONT L., FUCHS M., GALANTE N., GARCZARCZYK M., GAUG M., GILLER M., GOEBEL F., HAKOBYAN D., HAYASHIDA M., HENGSTEBECK T., HOHNE D., HOSE J., HSU C.C., JACON P., JOGLER T., KALEKIN O., KOSYRA R., KRANICH D., KRITZER R., LAATIAOUI M., LAILLE A., LIEBING P., LINDFORS E., LOMBARDI S., LONGO F., LOPEZ J., LOPEZ M., LORENZ E., MAJUMDAR P., MANEVA G., MANNHEIM K., MANSUTTI O., MARIOTTI M., MARTINEZ M., MAZIN D., MERCK C., MEUCCI M., MEYER M., MIRANDA J.M., MIRZOYAN R., MIZOBUCHI S., MORALEJO A., NILSSON K., NINKOVIC J., ONA-WILHELMI E., ORDUNA R., OTTE N., OYA I., PANEQUE D., PAOLETTI R., PAREDES J.M., PASANEN M., PASCOLI D., PAUSS F., PEGNA R., PERSIC M., PERUZZO L., PICCIOLI A., POLLER M., PRANDINI E., RAYMERS A., RHODE W., RIBO M., RICO J., RISSI M., ROBERT A., RUGAMER S., SAGGION A., SANCHEZ A., SARTORI P., SCALZOTTO V., SCAPIN V., SCHMITT R., SCHWEIZER T., SHAYDUK M., SHINOZAKI K., SHORE S.N., SIDRO N., SILLANPAA A., SOBCZYNSKA D., STAMERRA A., STARK L.S., TAKALO L., TEMNIKOV P., TESCARO D., TESHIMA M., TONELLO N., TORRES A., TORRES D.F., TURINI N., VANKOV H., VITALE V., WAGNER R.M., WIBIG T., WITTEK W., ZANIN R. and ZAPATERO J.

Abstract (from CDS):

The MAGIC telescope took data of very high energy γ-ray emission from the blazar Markarian 421 (Mrk 421) between 2004 November and 2005 April. We present a combined analysis of data samples recorded under different observational conditions, down to γ-ray energies of 100 GeV. The flux was found to vary between 0.5 and 2 crab (integrated above 200 GeV), considered a low state when compared to known data. Although the flux varied day by day, no short-term variability was observed, although there is some indication that not all nights show an equally quiescent state. The results at higher energies were found to be consistent with previous observations. A clear correlation is observed between γ-ray and X-ray fluxes, whereas no significant correlation between γ-ray and optical data is seen. The spectral energy distribution between 100 GeV and 3 TeV shows a clear deviation from a power law, more clearly and at lower flux than previous observations at higher energies. The deviation persists after correcting for the effect of attenuation by the extragalactic background light, and most likely is source-inherent. There is a rather clear indication of an inverse Compton peak around 100 GeV. The spectral energy distribution of Mrk 421 can be fitted by a one-zone synchrotron self-Compton model, suggesting once again a leptonic origin of the very high energy γ-ray emission from this blazar.

Abstract Copyright: ∼

Journal keyword(s): Galaxies: BL Lacertae Objects: Individual: Name: Markarian 421 - Gamma Rays: Observations

Simbad objects: 4

Full paper

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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

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