activity
19962026
most citedOptical and radio variability of the BL Lac object AO 0235+16: a possible 5-6 year periodicity

196 citations · 1.6k across the 22 of their papers we have counts for

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12 papers · 1 filter

astro-ph.HE2026★ 3 cited

Not so Swift: 20 years of multiwavelength observations of Mrk 421 and Mrk 501

Gabrielle L. Taylor, Stefan J. Wagner, Alicja Wierzcholska +1

Aims. The blazars Mrk 421 and Mrk 501 have shown multiwavelength variability on all observed timescales, and have been well studied at high energies on short timescales. We aim to…

astro-ph.HE2024

Exceptional X-ray activity in BL Lacertae

Alicja Wierzcholska, Stefan Wagner

BL Lacertae is a unique blazar for which the X-ray band can cover either the synchrotron or the inverse Compton, or both parts of the broadband spectral energy distribution. In the…

astro-ph.HE2013★ 20 cited

Discovery of an extended X-ray jet in AP Librae

S. Kaufmann, S. J. Wagner, O. Tibolla

Chandra observations of the low-energy peaked BL Lac object AP Librae revealed the clear discovery of a non-thermal X-ray jet. AP Lib is the first low energy peaked BL Lac object w…

astro-ph.HE2013★ 46 cited

H.E.S.S. Observations of the Binary System PSR B1259-63/LS 2883 around the 2010/2011 Periastron Passage

H. E. S. S. Collaboration, :, A. Abramowski +203

Aim. In this paper we present very high energy (VHE; E>100 GeV) data from the γ-ray binary system PSR B1259-63/LS 2883 taken around its periastron passage (15th of December 2010) w…

astro-ph.HE2012★ 55 cited

Discovery of hard-spectrum γ-ray emission from the BL Lac object 1ES 0414+009

The HESS Collaboration, A. Abramowski, F. Acero +199

1ES 0414+009 (z = 0.287) is a distant high-frequency-peaked BL Lac object, and has long been considered a likely emitter of very-high energy (VHE, E>100 GeV) gamma-rays due to its…

astro-ph.HE2011★ 116 cited

Discovery of extended VHE γ-ray emission from the vicinity of the young massive stellar cluster Westerlund 1

HESS Collaboration, A. Abramowski, F. Acero +198

Results obtained in very-high-energy (VHE; E > 100 GeV) γ-ray observations performed with the H.E.S.S. telescope array are used to investigate particle acceleration processes in th…