2011A&A...529A.145D


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.12CEST12:20:59

2011A&A...529A.145D - Astronomy and Astrophysics, volume 529A, 145-145 (2011/5-1)

AGILE detection of extreme γ-ray activity from the blazar PKS 1510-089 during March 2009. Multifrequency analysis.

D'AMMANDO F., RAITERI C.M., VILLATA M., ROMANO P., PUCELLA G., KRIMM H.A., COVINO S., ORIENTI M., GIOVANNINI G., VERCELLONE S., PIAN E., DONNARUMMA I., VITTORINI V., TAVANI M., ARGAN A., BARBIELLINI G., BOFFELLI F., BULGARELLI A., CARAVEO P., CATTANEO P.W., CHEN A.W., COCCO V., COSTA E., DEL MONTE E., DE PARIS G., DI COCCO G., EVANGELISTA Y., FEROCI M., FERRARI A., FIORINI M., FROYSLAND T., FRUTTI M., FUSCHINO F., GALLI M., GIANOTTI F., GIULIANI A., LABANTI C., LAPSHOV I., LAZZAROTTO F., LIPARI P., LONGO F., MARISALDI M., MEREGHETTI S., MORSELLI A., PACCIANI L., PELLIZZONI A., PEROTTI F., PIANO G., PICOZZA P., PILIA M., PORROVECCHIO G., PREST M., RAPISARDA M., RAPPOLDI A., RUBINI A., SABATINI S., SOFFITTA P., STRIANI E., TRIFOGLIO M., TROIS A., VALLAZZA E., ZAMBRA A., ZANELLO D., AGUDO I., ALLER H.D., ALLER M.F., ARKHAROV A.A., BACH U., BENITEZ E., BERDYUGIN A., BLINOV D.A., BUEMI C.S., CHEN W.P., DI PAOLA A., DOLCI M., FORNE E., FUHRMANN L., GOMEZ J.L., GURWELL M.A., JORDAN B., JORSTAD S.G., HEIDT J., HIRIART D., HOVATTA T., HSIAO H.Y., KIMERIDZE G., KONSTANTINOVA T.S., KOPATSKAYA E.N., KOPTELOVA E., KURTANIDZE O.M., KURTANIDZE S.O., LARIONOV V.M., LAEHTEENMAEKI A., LETO P., LINDFORS E., MARSCHER A.P., McBREEN B., McHARDY I.M., MOROZOVA D.A., NILSSON K., PASANEN M., ROCA-SOGORB M., SILLANPAEAE A., TAKALO L.O., TORNIKOSKI M., TRIGILIO C., TROITSKY I.S., UMANA G., ANTONELLI L.A., COLAFRANCESCO S., PITTORI C., SANTOLAMAZZA P., VERRECCHIA F., GIOMMI P. and SALOTTI L.

Abstract (from CDS):

We report on the extreme γ-ray activity from the flat spectrum radio quasar (FSRQ) PKS 1510-089 observed by the AGILE satellite in March 2009. In the same period a radio-to-optical monitoring of the source was provided by the GASP-WEBT and REM facilities. In the radio band we made use also of multi-epoch 15-GHz Very Long Baseline Array data from the MOJAVE Program to get information on the parsec-scale structure. Moreover, several Swift target of opportunity observations were triggered, adding important information on the source behaviour from optical/UV to hard X-rays. We paid particular attention to the calibration of the Swift/UVOT data to make it suitable to the blazars spectra. Simultaneous observations from radio to γ rays allowed us to study in detail the correlation among the emission variability at different frequencies and to investigate the mechanisms at work during this high activity state of the source. In the period 9-30 March 2009, AGILE detected γ-ray emission from PKS 1510-089 at a significance level of 21.5-σ with an average flux over the entire period of (311 ±21)x10–8photons/cm2/s forphoton energies above 100 MeV, and a peak level of (702 ±131)x10–8photons/cm2/s on daily integration. The activity detected in γ rays occurred during a period of increasing activity from near-infrared to UV, as monitored by GASP-WEBT, REM and Swift/UVOT. A flaring episode on 26-27 March 2009 was detected from near-IR to UV, suggesting that a single mechanism is responsible for the flux enhancement observed at the end of March. By contrast, Swift/XRT observations seem to show no clear correlation of the X-ray fluxes with the optical and γ-ray ones. However, the X-ray observations show a harder photon index (Γx≃1.3-1.6) with respect to most FSRQs and a hint of harder-when-brighter behaviour, indicating the possible presence of a second emission component at soft X-ray energies. Moreover, the broad band spectrum from radio-to-UV confirmed the evidence of thermal features in the optical/UV spectrum of PKS 1510-089 also during high γ-ray state. On the other hand, during 25-26 March 2009 a flat spectrum in the optical/UV energy band was observed, suggesting an important contribution of the synchrotron emission in this part of the spectrum during the brightest γ-ray flare, therefore a significant shift of the synchrotron peak.

Abstract Copyright:

Journal keyword(s): radiation mechanisms: non-thermal - galaxies: active - gamma rays: general - quasars: general - 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 - 2020
#notes
1 QSO B0235+1624 BLL 02 38 38.93010 +16 36 59.2746   16.46 15.50 15.92   ~ 1393 2
2 4C 50.11 QSO 03 59 29.74726473 +50 57 50.1615765           ~ 395 1
3 QSO J0530+13 QSO 05 30 56.41672 +13 31 55.1495     20.0 19.35   ~ 879 1
4 3C 273 BLL 12 29 06.6996828061 +02 03 08.598846466   13.05 14.830 14.11   ~ 5320 1
5 3C 279 QSO 12 56 11.1664521013 -05 47 21.531840471   18.01 17.75 15.87   ~ 2704 2
6 QSO J1512-0906 QSO 15 12 50.53292491 -09 05 59.8295878   16.74 16.54     ~ 1149 1
7 3C 454.3 QSO 22 53 57.74798 +16 08 53.5611   16.57 16.10 15.22   ~ 2506 2

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2020.07.12-12:20:59

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