2018A&A...617A..30M


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.10CEST01:52:52

2018A&A...617A..30M - Astronomy and Astrophysics, volume 617A, 30-30 (2018/9-1)

Detection of the blazar S4 0954+65 at very-high-energy with the MAGIC telescopes during an exceptionally high optical state.

MAGIC COLLABORATION, AHNEN M.L., ANSOLDI S., ANTONELLI L.A., ARCARO C., BAACK D., BABIC A., BANERJEE B., BANGALE P., BARRES DE ALMEIDA U., BARRIO J.A., BEDNAREK W., BERNARDINI E., BERSE R.C., BERTI A., BHATTACHARYYA W., BILAND A., BLANCH O., BONNOLI G., CAROSI R., CAROSI A., CERIBELLA G., CHATTERJEE A., COLAK S.M., COLIN P., COLOMBO E., CONTRERAS J.L., CORTINA J., COVINO S., CUMANI P., DA VELA P., DAZZI F., DE ANGELIS A., DE LOTTO B., DELFINO M., DELGADO J., DI PIERRO F., DOMINGUEZ A., DOMINIS PRESTER D., DORNER D., DORO M., EINECKE S., ELSAESSER D., FALLAH RAMAZANI V., FERNANDEZ-BARRAL A., FIDALGO D., FONSECA M.V., FONT L., FRUCK C., GALINDO D., GARCIA LOPEZ R.J., GARCZARCZYK M., GAUG M., GIAMMARIA P., GODINOVIC N., GORA D., GUBERMAN D., HADASCH D., HAHN A., HASSAN T., HAYASHIDA M., HERRERA J., HOSE J., HRUPEC D., ISHIO K., KONNO Y., KUBO H., KUSHIDA J., KUVEZDIC D., LELAS D., LINDFORS E., LOMBARDI S., LONGO F., LOPEZ M., MAGGIO C., MAJUMDAR P., MAKARIEV M., MANEVA G., MANGANARO M., MANNHEIM K., MARASCHI L., MARIOTTI M., MARTINEZ M., MASUDA S., MAZIN D., MIELKE K., MINEV M., MIRANDA J.M., MIRZOYAN R., MORALEJO A., MORENO V., MORETTI E., NAGAYOSHI T., NEUSTROEV V., NIEDZWIECKI A., NIEVAS ROSILLO M., NIGRO C., NILSSON K., NINCI D., NISHIJIMA K., NODA K., NOGUES L., PAIANO S., PALACIO J., PANEQUE D., PAOLETTI R., PAREDES J.M., PEDALETTI G., PERESANO M., PERSIC M., PRADA MORONI P.G., PRANDINI E., PULJAK I., GARCIA J.R., REICHARDT I., RHODE W., RIBO M., RICO J., RIGHI C., RUGLIANCICH A., SAITO T., SATALECKA K., SCHWEIZER T., SITAREK J., SNIDARIC I., SOBCZYNSKA D., STAMERRA A., STRZYS M., SURIC T., TAKAHASHI M., TAKALO L., TAVECCHIO F., TEMNIKOV P., TERZIC T., TESHIMA M., TORRES-ALBA N., TREVES A., TSUJIMOTO S., VANZO G., VAZQUEZ ACOSTA M., VOVK I., WARD J.E., WILL M., ZARIC D., BECERRA GONZALEZ J., TANAKA Y., OJHA R., FINKE J., LAHTEENMAKI A., JARVELA E., TORNIKOSKI M., RAMAKRISHNAN V., HOVATTA T., JORSTAD S.G., MARSCHER A.P., LARIONOV V.M., BORMAN G.A., GRISHINA T.S., KOPATSKAYA E.N., LARIONOVA L.V., MOROZOVA D.A., SAVCHENKO S.S., TROITSKAYA Y.V., TROITSKY I.S., VASILYEV A.A., AGUDO I., MOLINA S.N., CASADIO C., GURWELL M., CARNERERO M.I., PROTASIO C. and ACOSTA PULIDO J.A.

Abstract (from CDS):


Aims. The very high energy (VHE≥100GeV) γ-ray MAGIC observations of the blazar S4 0954+65, were triggered by an exceptionally high flux state of emission in the optical. This blazar has a disputed redshift of z=0.368 or z≥0.45 and an uncertain classification among blazar subclasses. The exceptional source state described here makes for an excellent opportunity to understand physical processes in the jet of S4 0954+65 and thus contribute to its classification.
Methods. We investigated the multiwavelength (MWL) light curve and spectral energy distribution (SED) of the S4 0954+65 blazar during an enhanced state in February 2015 and have put it in context with possible emission scenarios. We collected photometric data in radio, optical, X-ray, and γ-ray. We studied both the optical polarization and the inner parsec-scale jet behavior with 43GHz data.
Results. Observations with the MAGIC telescopes led to the first detection of S4 0954+65 at VHE. Simultaneous data with Fermi-LAT at high energy γ-ray (HE, 100MeV<E<100GeV) also show a period of increased activity. Imaging at 43GHz reveals the emergence of a new feature in the radio jet in coincidence with the VHE flare. Simultaneous monitoring of the optical polarization angle reveals a rotation of approximately 100°.
Conclusions. The high emission state during the flare allows us to compile the simultaneous broadband SED and to characterize it in the scope of blazar jet emission models. The broadband spectrum can be modeled with an emission mechanism commonly invoked for flat spectrum radio quasars (FSRQs), that is, inverse Compton scattering on an external soft photon fieldfrom the dust torus, also known as external Compton. The light curve and SED phenomenology is consistent with an interpretation of a blob propagating through a helical structured magnetic field and eventually crossing a standing shock in the jet, a scenario typically applied to FSRQs and low-frequency peaked BL Lac objects (LBL).

Abstract Copyright: © ESO 2018

Journal keyword(s): gamma rays: galaxies - galaxies: active - BL Lacertae objects: individual: S4 0954+65

CDS comments: Knots not in SIMBAD.

Simbad objects: 3

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Number of rows : 3

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 6C 095456+654857 BLL 09 58 47.2452838930 +65 33 54.821524491     17.0 15.75   ~ 617 1
2 3C 286 Sy1 13 31 08.2885060664 +30 30 32.960825108   17.51 17.25     ~ 3716 1
3 QSO J1512-0906 QSO 15 12 50.53292491 -09 05 59.8295878   16.74 16.54     ~ 1148 1

    Equat.    Gal    SGal    Ecl

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2020.07.10-01:52:52

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