2018A&A...619A.159M

Query : 2018A&A...619A.159M

2018A&A...619A.159M - Astronomy and Astrophysics, volume 619A159-159 (2018/11-1)

Detection of persistent VHE gamma-ray emission from PKS 1510-089 by the MAGIC telescopes during low states between 2012 and 2017.

MAGIC COLLABORATION, ACCIARI V.A., ANSOLDI S., ANTONELLI L.A., ARBET ENGELS A., ARCARO C., BAACK D., BABIC A., BANERJEE B., BANGALE P., BARRES DE ALMEIDA U., BARRIO J.A., BEDNAREK W., BERNARDINI E., BERTI A., BESENRIEDER J., BHATTACHARYYA W., BIGONGIARI C., BILAND A., BLANCH O., BONNOLI G., CAROSI R., CERIBELLA G., CIKOTA S., COLAK S.M., COLIN P., COLOMBO E., CONTRERAS J.L., CORTINA J., COVINO S., D'ELIA V., DA VELA P., DAZZI F., DE ANGELIS A., DE LOTTO B., DELFINO M., DELGADO J., DI PIERRO F., DO SOUTO ESPINERA E., DOMINGUEZ A., DOMINIS PRESTER D., DORNER D., DORO M., EINECKE S., ELSAESSER D., FALLAH RAMAZANI V., FATTORINI A., FERNANDEZ-BARRAL A., FERRARA G., FIDALGO D., FOFFANO L., FONSECA M.V., FONT L., FRUCK C., GALINDO D., GALLOZZI S., GARCIA LOPEZ R.J., GARCZARCZYK M., GAUG M., GIAMMARIA P., GODINOVIC N., GUBERMAN D., HADASCH D., HAHN A., HASSAN T., HERRERA J., HOANG J., HRUPEC D., INOUE S., ISHIO K., IWAMURA Y., KUBO H., KUSHIDA J., KUVEZDIC D., LAMASTRA A., LELAS D., LEONE F., LINDFORS E., LOMBARDI S., LONGO F., LOPEZ M., LOPEZ-ORAMAS A., MAGGIO C., MAJUMDAR P., MAKARIEV M., MANEVA G., MANGANARO M., MANNHEIM K., MARASCHI L., MARIOTTI M., MARTINEZ M., MASUDA S., MAZIN D., MINEV M., MIRANDA J.M., MIRZOYAN R., MOLINA E., MORALEJO A., MORENO V., MORETTI E., MUNAR-ADROVER P., 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., PENIL P., PERESANO M., PERSIC M., PRADA MORONI P.G., PRANDINI E., PULJAK I., GARCIA J.R., RHODE W., RIBO M., RICO J., RIGHI C., RUGLIANCICH A., SAHA L., SAITO T., SATALECKA K., SCHWEIZER T., SITAREK J., SNIDARIC I., SOBCZYNSKA D., SOMERO A., STAMERRA A., STRZYS M., SURIC T., TAVECCHIO F., TEMNIKOV P., TERZIC T., TESHIMA M., TORRES-ALBA N., TSUJIMOTO S., VAN SCHERPENBERG J., VANZO G., VAZQUEZ ACOSTA M., VOVK I., WARD J.E., WILL M., ZARIC D. (The Fermi-LAT Collaboration), BECERRA GONZALEZ J., RAITERI C.M., SANDRINELLI A., HOVATTA T., KIEHLMANN S., MAX-MOERBECK W., TORNIKOSKI M., LAHTEENMAKI A., TAMMI J., RAMAKRISHNAN V., THUM C., AGUDO I., MOLINA S.N., GOMEZ J.L., FUENTES A., CASADIO C., TRAIANOU E., MYSERLIS I. and KIM J.-Y.

Abstract (from CDS):


Context. PKS 1510-089 is a flat spectrum radio quasar strongly variable in the optical and GeV range. To date, very high-energy (VHE, >100GeV) emission has been observed from this source either during long high states of optical and GeV activity or during short flares.
Aims. We search for low-state VHE gamma-ray emission from PKS 1510-089. We characterize and model the source in a broadband context, which would provide a baseline over which high states and flares could be better understood.
Methods. PKS 1510-089 has been monitored by the MAGIC telescopes since 2012. We use daily binned Fermi-LAT flux measurements of PKS 1510-089 to characterize the GeV emission and select the observation periods of MAGIC during low state of activity. For the selected times we compute the average radio, IR, optical, UV, X-ray, and gamma-ray emission to construct a low-state spectral energy distribution of the source. The broadband emission is modeled within an external Compton scenario with a stationary emission region through which plasma and magnetic fields are flowing. We also perform the emission-model-independent calculations of the maximum absorption in the broad line region (BLR) using two different models.
Results. The MAGIC telescopes collected 75 hr of data during times when the Fermi-LAT flux measured above 1 GeV was below 3x10–8cm–2s–1, which is the threshold adopted for the definition of a low gamma-ray activity state. The data show a strongly significant (9.5σ) VHE gamma-ray emission at the level of (4.27±0.61stat)x10–12cm–2s–1 above 150GeV, a factor of 80 lower than the highest flare observed so far from this object. Despite the lower flux, the spectral shape is consistent with earlier detections in the VHE band. The broadband emission is compatible with the external Compton scenario assuming a large emission region located beyond the BLR. For the first time the gamma-ray data allow us to place a limit on the location of the emission region during a low gamma-ray state of a FSRQ. For the used model of the BLR, the 95% confidence level on the location of the emission region allows us to place it at a distance >74% of the outer radius of the BLR.

Abstract Copyright: © ESO 2018

Journal keyword(s): galaxies: active - galaxies: jets - gamma rays: galaxies - quasars: individual: PKS 1510-089

Simbad objects: 7

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Number of rows : 7
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 6C 021803+354230 BLL 02 21 05.4920852208 +35 56 13.848581904   20.0 20.0 19.60   ~ 603 3
2 NGC 1275 Bla 03 19 48.1599902040 +41 30 42.108850836   13.10 12.48 11.09   ~ 4243 3
3 M 87 AGN 12 30 49.42338414 +12 23 28.0436859 10.16 9.59 8.63   7.49 ~ 7815 3
4 3C 286 Sy1 13 31 08.2883506368 +30 30 32.960091564   17.51 17.25     ~ 4558 2
5 QSO J1512-0906 Bla 15 12 50.53293048 -09 05 59.8297908   16.74 16.54     ~ 1409 1
6 PMN J1532-1319 Bla 15 32 45.37473348 -13 19 10.0860403       22.20   ~ 72 1
7 NGC 7027 PN 21 07 01.571952 +42 14 10.47120   10.358 8.831 10.157   ~ 2541 1

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