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2013ApJ...779...92A - Astrophys. J., 779, 92 (2013/December-3)

Long term observations of B2 1215+30 with VERITAS.

ALIU E., ARCHAMBAULT S., ARLEN T., AUNE T., BEILICKE M., BENBOW W., BIRD R., BOUVIER A., BUCKLEY J.H., BUGAEV V., CESARINI A., CIUPIK L., CONNOLLY M.P., CUI W., DUMM J., ERRANDO M., FALCONE A., FEDERICI S., FENG Q., FINLEY J.P., FORTIN P., FORTSON L., FURNISS A., GALANTE N., GERARD L., GILLANDERS G.H., GRIFFIN S., GRUBE J., GYUK G., HANNA D., HOLDER J., HUGHES G., HUMENSKY T.B., KAARET P., KERTZMAN M., KHASSEN Y., KIEDA D., KRAWCZYNSKI H., KRENNRICH F., LANG M.J., MADHAVAN A.S., MAIER G., MAJUMDAR P., McARTHUR S., McCANN A., MORIARTY P., MUKHERJEE R., NIETO D., DE BHROITHE A.O., ONG R.A., ORR M., OTTE A.N., PARK N., PERKINS J.S., POHL M., POPKOW A., PROKOPH H., QUINN J., RAGAN K., REYES L.C., REYNOLDS P.T., RICHARDS G.T., ROACHE E., SAXON D.B., SEMBROSKI G.H., SKOLE C., SMITH A.W., SOARES-FURTADO M., STASZAK D., TELEZHINSKY I., TESIC G., THEILING M., VARLOTTA A., VASSILIEV V.V., VINCENT S., WAKELY S.P., WEEKES T.C., WEINSTEIN A., WELSING R., WILLIAMS D.A., ZITZER B. (The VERITAS Collaboration), BOTTCHER M., FUMAGALLI M. and JADHAV J.

Abstract (from CDS):

We report on VERITAS observations of the BL Lac object B2 1215+30 between 2008 and 2012. During this period, the source was detected at very high energies (VHEs; E > 100 GeV) by VERITAS with a significance of 8.9σ and showed clear variability on timescales larger than months. In 2011, the source was found to be in a relatively bright state and a power-law fit to the differential photon spectrum yields a spectral index of 3.6±0.4stat± 0.3syst with an integral flux above 200 GeV of (8.0±0.9stat± 3.2syst)x10–12/cm2/s. No short term variability could be detected during the bright state in 2011. Multi-wavelength data were obtained contemporaneously with the VERITAS observations in 2011 and cover optical (Super-LOTIS, MDM, Swift/UVOT), X-ray (Swift/XRT), and gamma-ray (Fermi-LAT) frequencies. These were used to construct the spectral energy distribution (SED) of B2 1215+30. A one-zone leptonic model is used to model the blazar emission and the results are compared to those of MAGIC from early 2011 and other VERITAS-detected blazars. The SED can be reproduced well with model parameters typical for VHE-detected BL Lac objects.

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Journal keyword(s): BL Lacertae objects: general - BL Lacertae objects: individual (B2 1215+30, VER J1217+301)

Simbad objects: 15

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