2013A&A...556A..67A

Query : 2013A&A...556A..67A

2013A&A...556A..67A - Astronomy and Astrophysics, volume 556A67-67 (2013/8-1)

The simultaneous low state spectral energy distribution of 1ES 2344+514 from radio to very high energies.

ALEKSIC J., ANTONELLI L.A., ANTORANZ P., ASENSIO M., BACKES M., BARRES DE ALMEIDA U., BARRIO J.A., BEDNAREK W., BERGER K., BERNARDINI E., BILAND A., BLANCH O., BOCK R.K., BOLLER A., BONNEFOY S., BONNOLI G., BORLA TRIDON D., BRETZ T., CARMONA E., CAROSI A., CARRETO FIDALGO D., COLIN P., COLOMBO E., CONTRERAS J.L., CORTINA J., COSSIO L., COVINO S., DA VELA P., DAZZI F., DE ANGELIS A., DE CANEVA G., DE LOTTO B., DELGADO MENDEZ C., DOERT M., DOMINGUEZ A., DOMINIS PRESTER D., DORNER D., DORO M., EISENACHER D., ELSAESSER D., FERENC D., FONSECA M.V., FONT L., FRUCK C., GARCIA LOPEZ R.J., GARCZARCZYK M., GARRIDO TERRATS D., GAUG M., GIAVITTO G., GODINOVIC N., GONZALEZ MUNOZ A., GOZZINI S.R., HADAMEK A., HADASCH D., HERRERO A., HOSE J., HRUPEC D., JANKOWSKI F., KADENIUS V., KLEPSER S., KNOETIG M.L., KRAEHENBUEHL T., KRAUSE J., KUSHIDA J., LA BARBERA A., LELAS D., LEONARDO E., LEWANDOWSKA N., LINDFORS E., LOMBARDI S., LOPEZ M., LOPEZ-COTO R., LOPEZ-ORAMAS A., LORENZ E., LOZANO I., MAKARIEV M., MALLOT K., MANEVA G., MANKUZHIYIL N., MANNHEIM K., MARASCHI L., MARCOTE B., MARIOTTI M., MARTINEZ M., MASBOU J., MAZIN D., MEUCCI M., MIRANDA J.M., MIRZOYAN R., MOLDON J., MORALEJO A., MUNAR-ADROVER P., NAKAJIMA D., NIEDZWIECKI A., NIETO D., NILSSON K., NOWAK N., ORITO R., PAIANO S., PALATIELLO M., PANEQUE D., PAOLETTI R., PAREDES J.M., PARTINI S., PERSIC M., PILIA M., PRADA F., PRADA MORONI P.G., PRANDINI E., PULJAK I., REICHARDT I., REINTHAL R., RHODE W., RIBO M., RICO J., RUEGAMER S., SAGGION A., SAITO K., SAITO T.Y., SALVATI M., SATALECKA K., SCALZOTTO V., SCAPIN V., SCHULTZ C., SCHWEIZER T., SHORE S.N., SILLANPAEAE A., SITAREK J., SNIDARIC I., SOBCZYNSKA D., SPANIER F., SPIRO S., STAMATESCU V., STAMERRA A., STEINKE B., STORZ J., SUN S., SURIC T., TAKALO L., TAKAMI H., TAVECCHIO F., TEMNIKOV P., TERZIC T., TESCARO D., TESHIMA M., TIBOLLA O., TORRES D.F., TOYAMA T., TREVES A., UELLENBECK M., VOGLER P., WAGNER R.M., WEITZEL Q., ZANDANEL F., ZANIN R., LONGO F., LUCARELLI F., PITTORI C., VERCELLONE S., BASTIERI D., SBARRA C., ANGELAKIS E., FUHRMANN L., NESTORAS I., KRICHBAUM T.P., SIEVERS A., ZENSUS J.A., ANTONYUK K.A., BAUMGARTNER W., BERDYUGIN A., CARINI M., COOK K., GEHRELS N., KADLER M., KOVALEV Yu.A., KOVALEV Y.Y., KRAUSS F., KRIMM H.A., LAEHTEENMAEKI A., LISTER M.L., MAX-MOERBECK W., PASANEN M., PUSHKAREV A.B., READHEAD A.C.S., RICHARDS J.L., SAINIO J., SHAKHOVSKOY D.N., SOKOLOVSKY K.V., TORNIKOSKI M., TUELLER J., WEIDINGER M. and WILMS J.

Abstract (from CDS):

BL Lacertae objects are variable at all energy bands on time scales down to minutes. To construct and interpret their spectral energy distribution (SED), simultaneous broad-band observations are mandatory. Up to now, the number of objects studied during such campaigns is very limited and biased towards high flux states. We present the results of a dedicated multi-wavelength study of the high-frequency peaked BL Lacertae (HBL) object and known TeV emitter 1ES2344+514 by means of a pre-organised campaign. The observations were conducted during simultaneous visibility windows of MAGIC and AGILE in late 2008. The measurements were complemented by Metsaehovi, RATAN-600, KVA+Tuorla, Swift and VLBA pointings. Additional coverage was provided by the ongoing long-term F-GAMMA and MOJAVE programs, the OVRO 40-m and CrAO telescopes as well as the Fermi satellite. The obtained SEDs are modelled using a one-zone as well as a self-consistent two-zone synchrotron self-Compton model. 1ES2344+514 was found at very low flux states in both X-rays and very high energy gamma rays. Variability was detected in the low frequency radio and X-ray bands only, where for the latter a small flare was observed. The X-ray flare was possibly caused by shock acceleration characterised by similar cooling and acceleration time scales. MOJAVE VLBA monitoring reveals a static jet whose components are stable over time scales of eleven years, contrary to previous findings. There appears to be no significant correlation between the 15GHz and R-band monitoring light curves. The observations presented here constitute the first multi-wavelength campaign on 1ES2344+514 from radio to VHE energies and one of the few simultaneous SEDs during low activity states. The quasi-simultaneous Fermi-LAT data poses some challenges for SED modelling, but in general the SEDs are described well by both applied models. The resulting parameters are typical for TeV emitting HBLs. Consequently it remains unclear whether a so-called quiescent state was found in this campaign.

Abstract Copyright: ∼

Journal keyword(s): galaxies: active - BL Lacertae objects: individual: 1ES 2344+514 - gamma rays: galaxies - X-rays: individuals: 1ES 2344+514 - radiation mechanisms: non-thermal

CDS comments: Fig.12, Table A.5 cores not in Simbad.

Simbad objects: 18

Full paper

View the references in ADS

Number of rows : 18

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	3C 48	QSO	01 37 41.2996631208	+33 09 35.080388820		16.62	16.20			~	2924	2
2	NAME W 3 OH	HII	02 27 04.1	+61 52 22						~	1064	2
3	NGC 1275	Bla	03 19 48.1599902040	+41 30 42.108850836		13.10	12.48	11.09		~	4243	3
4	2C 553	QSO	06 27 10.125	-05 53 06.21						~	165	1
5	Z 184-50	BLL	11 04 27.3140835504	+38 12 31.798495872		13.50	12.90	8.31		~	2841	1
6	Z 334-43	BLL	11 36 26.4090783600	+70 09 27.309071232		15.16	14.49	10.51		~	394	1
7	RX J1217.8+3007	BLL	12 17 52.0819904040	+30 07 00.634936872		16.07	15.62	13.47		G7	516	1
8	M 87	AGN	12 30 49.42338414	+12 23 28.0436859	10.16	9.59	8.63		7.49	~	7815	3
9	3C 286	Sy1	13 31 08.2883506368	+30 30 32.960091564		17.51	17.25			~	4558	2
10	3C 295	Sy1	14 11 20.6	+52 12 09		22.34	20.80	18.54		~	1021	4
11	PG 1553+113	BLL	15 55 43.0440048528	+11 11 24.365649948	14.91	14.72	14.57	13.99		~	672	1
12	Z 225-7	BLL	16 53 52.21668403	+39 45 36.6088754	14.09	14.15	13.29	8.26		~	2304	2
13	QSO B1959+650	BLL	19 59 59.8520303688	+65 08 54.652536492			12.8	11.21		~	699	2
14	NAME K 3-50A	HII	20 01 45.6	+33 32 42						~	85	0
15	DR 21	SFR	20 39 01.6	+42 19 38						O4.5	1121	0
16	NGC 7027	PN	21 07 01.571952	+42 14 10.47120		10.358	8.831	10.157		~	2541	1
17	PKS J2158-3013	BLL	21 58 52.0652249880	-30 13 32.118447792		13.36	13.09	12.62		~	1829	1
18	QSO B2344+514	BLL	23 47 04.8372110928	+51 42 17.877513168			15.50	10.7		~	500	1

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