2011ApJ...738...25A

Query : 2011ApJ...738...25A

2011ApJ...738...25A - Astrophys. J., 738, 25 (2011/September-1)

TeV and multi-wavelength observations of Mrk 421 in 2006-2008.

ACCIARI V.A., ALIU E., ARLEN T., AUNE T., BEILICKE M., BENBOW W., BOLTUCH D., BRADBURY S.M., BUCKLEY J.H., BUGAEV V., BYRUM K., CANNON A., CESARINI A., CIUPIK L., CUI W., DICKHERBER R., DUKE C., FALCONE A., FINLEY J.P., FINNEGAN G., FORTSON L., FURNISS A., GALANTE N., GALL D., GILLANDERS G.H., GODAMBE S., GRUBE J., GUENETTE R., GYUK G., HANNA D., HOLDER J., HUI C.M., HUMENSKY T.B., IMRAN A., KAARET P., KARLSSON N., KERTZMAN M., KIEDA D., KONOPELKO A., KRAWCZYNSKI H., KRENNRICH F., LANG M.J., MAIER G., McARTHUR S., McCUTCHEON M., MORIARTY P., ONG R.A., OTTE A.N., OUELLETTE M., PANDEL D., PERKINS J.S., PICHEL A., POHL M., QUINN J., RAGAN K., REYES L.C., REYNOLDS P.T., ROACHE E., ROSE H.J., ROVERO A.C., SCHROEDTER M., SEMBROSKI G.H., DEMET SENTURK G., STEELE D., SWORDY S.P., THEILING M., THIBADEAU S., VARLOTTA A., VASSILIEV V.V., VINCENT S., WAGNER R.G., WAKELY S.P., WARD J.E., WEEKES T.C., WEINSTEIN A., WEISGARBER T., WILLIAMS D.A., WISSEL S., WOOD M., ZITZER B., GARSON III A., LEE K., SADUN A.C., CARINI M., BARNABY D., COOK K., MAUNE J., PEASE A., SMITH S., WALTERS R., BERDYUGIN A., LINDFORS E., NILSSON K., PASANEN M., SAINIO J., SILLANPAA A., TAKALO L.O., VILLFORTH C., MONTARULI T., BAKER M., LAHTEENMAKI A., TORNIKOSKI M., HOVATTA T., NIEPPOLA E., ALLER H.D. and ALLER M.F.

Abstract (from CDS):

We report on TeV γ-ray observations of the blazar Mrk 421 (redshift of 0.031) with the VERITAS observatory and the Whipple 10 m Cherenkov telescope. The excellent sensitivity of VERITAS allowed us to sample the TeV γ-ray fluxes and energy spectra with unprecedented accuracy where Mrk 421 was detected in each of the pointings. A total of 47.3 hr of VERITAS and 96 hr of Whipple 10 m data were acquired between 2006 January and 2008 June. We present the results of a study of the TeV γ-ray energy spectra as a function of time and for different flux levels. On 2008 May 2 and 3, bright TeV γ-ray flares were detected with fluxes reaching the level of 10 Crab. The TeV γ-ray data were complemented with radio, optical, and X-ray observations, with flux variability found in all bands except for the radio wave band. The combination of the Rossi X-ray Timing Explorer and Swift X-ray data reveal spectral hardening with increasing flux levels, often correlated with an increase of the source activity in TeV γ-rays. Contemporaneous spectral energy distributions were generated for 18 nights, each of which are reasonably described by a one-zone synchrotron self-Compton model.

Abstract Copyright: ∼

Journal keyword(s): BL Lacertae objects: individual: Mrk 421 - galaxies: jets - galaxies: nuclei - gamma rays: galaxies - X-rays: galaxies

Simbad objects: 8

Full paper

View the references in ADS

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	NGC 1275	Bla	03 19 48.1599902040	+41 30 42.108850836		13.10	12.48	11.09		~	4243	3
2	Z 184-50	BLL	11 04 27.3140835504	+38 12 31.798495872		13.50	12.90	8.31		~	2841	1
3	M 87	AGN	12 30 49.42338414	+12 23 28.0436859	10.16	9.59	8.63		7.49	~	7815	3
4	3C 279	Bla	12 56 11.16657958	-05 47 21.5251510		18.01	17.75	15.87		~	3205	2
5	Z 225-7	BLL	16 53 52.21668403	+39 45 36.6088754	14.09	14.15	13.29	8.26		~	2304	2
6	DR 21	SFR	20 39 01.6	+42 19 38						O4.5	1121	0
7	PKS J2158-3013	BLL	21 58 52.0652249880	-30 13 32.118447792		13.36	13.09	12.62		~	1829	1
8	QSO B2344+514	BLL	23 47 04.8372110928	+51 42 17.877513168			15.50	10.7		~	500	1

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