TY - GEN
T1 - Detailed multifrequency studies of the high-frequency-peaked bl lac object 1es 1011+496 in 2011 and 2012
AU - FOR THE MOJAVE COLLABORATION
AU - FOR THE OVRO COLLABORATION
AU - FOR THE METSÄHOVI RADIO OBSERVATORY
AU - FOR THE MAGIC COLLABORATION
AU - FOR THE Fermi COLLABORATION
AU - Paiano, S.
AU - Schultz, C.
AU - Almeida, U. Barres De
AU - Vela, P. D.A.
AU - Lindfors, E.
AU - Tavecchio, F.
AU - Buson, S.
AU - D’Ammando, F.
AU - Lister, M. L.
AU - Hovatta, T.
AU - Lahteenmaki, A.
AU - Mundell, C.
AU - Steele, I.
PY - 2013/1/1
Y1 - 2013/1/1
N2 - We present multiwavelength (MWL) observations of the high-frequency-peaked BL Lac object 1ES 1011+496 (z = 0.212 [1]), based on very high energy (VHE, E > 100 GeV) observations performed with the stereoscopic system of MAGIC in 2011 and 2012. The system, located on La Palma, Canary Islands, Spain, consists of two 17 m diameter imaging Cherenkov telescopes allowing measurements down to a threshold as low as 50 GeV. While VHE observations in 2011 yielded a barely significant detection, 1ES 1011+496 was clearly detected in 2012 by MAGIC allowing a detailed measure of the differential spectrum. During both years the flux level above 150 GeV was compatible to that previously observed by MAGIC in this energy regime, and the source did not show any statistically significant variability in VHE γ-rays. Complementary MWL campaigns during previous VHE observations with MAGIC performed in mono mode, were lacking high energy (HE, E < 100 GeV) detection to cover the second peak of the spectral energy distribution (SED). The observations presented here provide a more precise determination of the SED which are reproduced with a one-zone Synchrotron-Self Compton (SSC) model. In particular, the inverse Compton (IC) peak is well constrained for the first time by the simultaneous coverage in HE and VHE γ-rays by Fermi-LAT and MAGIC. In addition, the results of optical polarimetric studies performed in 2012 will be shown in combination with multiepoch radio maps.
AB - We present multiwavelength (MWL) observations of the high-frequency-peaked BL Lac object 1ES 1011+496 (z = 0.212 [1]), based on very high energy (VHE, E > 100 GeV) observations performed with the stereoscopic system of MAGIC in 2011 and 2012. The system, located on La Palma, Canary Islands, Spain, consists of two 17 m diameter imaging Cherenkov telescopes allowing measurements down to a threshold as low as 50 GeV. While VHE observations in 2011 yielded a barely significant detection, 1ES 1011+496 was clearly detected in 2012 by MAGIC allowing a detailed measure of the differential spectrum. During both years the flux level above 150 GeV was compatible to that previously observed by MAGIC in this energy regime, and the source did not show any statistically significant variability in VHE γ-rays. Complementary MWL campaigns during previous VHE observations with MAGIC performed in mono mode, were lacking high energy (HE, E < 100 GeV) detection to cover the second peak of the spectral energy distribution (SED). The observations presented here provide a more precise determination of the SED which are reproduced with a one-zone Synchrotron-Self Compton (SSC) model. In particular, the inverse Compton (IC) peak is well constrained for the first time by the simultaneous coverage in HE and VHE γ-rays by Fermi-LAT and MAGIC. In addition, the results of optical polarimetric studies performed in 2012 will be shown in combination with multiepoch radio maps.
KW - 1ES 1011+496
KW - AGNs
KW - BL Lac objects
KW - MAGIC
KW - Multiwavelength campaigns
KW - VHE γ-rays
UR - http://www.scopus.com/inward/record.url?scp=85052437820&partnerID=8YFLogxK
M3 - Chapter in a published conference proceeding
AN - SCOPUS:85052437820
T3 - Proceedings of the 33rd International Cosmic Rays Conference, ICRC 2013
BT - Proceedings of the 33rd International Cosmic Rays Conference, ICRC 2013
PB - Sociedade Brasileira de Fisica
T2 - 33rd International Cosmic Rays Conference, ICRC 2013
Y2 - 2 July 2013 through 9 July 2013
ER -