M. Girma

A low-cost miniature 120GHz SiP FMCW/CW radar sensor with software linearization

Yaoming Sun, M. Marinkovic, Gunter Fischer, Wolfgang Winkler et autres

This paper presents an integrated mixed-signal 120GHz FMCW/CW radar chipset in a 0.13μm SiGe BiCMOS technology. It features on-chip MMW built-in-self-test (BIST) circuits, a harmonic transceiver, software linearization (SWL) circuits and a digital interface. This chipset has been tested in a low-cost …

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Observations of 14 young open star clusters with the HEGRA system of Cherenkov telescopes

F. Aharonian, A. G. Akhperjanian, M. Beilicke, K. Bernlöhr et autres

Context.A sample of 14 young open star clusters has been observed in the TeV energy regime with the stereoscopic system of the HEGRA (High Energy Gamma-Ray Astronomy) Cherenkov telescopes from 1997 to 2002, resulting in more than 300 h of observation time.

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TeV gamma-ray observations of SS-433 and a survey of the surrounding field with the HEGRA IACT-System

F. Aharonian, A. G. Akhperjanian, M. Beilicke, K. Bernlöhr et autres

We present results of a search for TeV γ -ray emission from the microquasar SS-433 and the surrounding region covering a ~ field of view. Analysis of data taken with the HEGRA stereoscopic system of imaging atmospheric Čerenkov imaging telescopes reveals no …

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The unidentified TeV source (TeV J2032+4130) and surrounding field: Final HEGRA IACT-System results

F. Aharonian, A. G. Akhperjanian, M. Beilicke, K. Bernlöhr et autres

The unidentified TeV source in Cygnus is now confirmed by follow-up observations from 2002 with the HEGRA stereoscopic system of Cherenkov Telescopes. Using all data (1999 to 2002) we confirm this new source as steady in flux over the four years of …

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The Crab Nebula and Pulsar between 500 GeV and 80 TeV: Observations with the HEGRA Stereoscopic Air Cerenkov Telescopes

F. Aharonian, A. G. Akhperjanian, M. Beilicke, K. Bernlöhr et autres

The Crab supernova remnant has been observed regularly with the stereoscopic system of five imaging air Cerenkov telescopes that was part of the High Energy Gamma Ray Astronomy (HEGRA) experiment. In total, close to 400 hr of useful data have been collected …

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Observations of 54 Active Galactic Nuclei with the HEGRA system of Cherenkov telescopes

F. Aharonian, A. G. Akhperjanian, M. Beilicke, K. Bernlöhr et autres

A sample of 54 selected Active Galactic Nuclei (AGN) has been observed with the HEGRA stereoscopic system of Cherenkov Telescopes between 1996 and 2002 in the TeV energy regime. The observations were motivated by the positive results obtained for Mkn 421 and …

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Observation of the Monoceros Loop SNR region with the HEGRA system of IACTs

F. Aharonian, A. G. Akhperjanian, M. Beilicke, K. Bernlöhr et autres

The array of 5 imaging atmospheric Čerenkov telescopes (IACTs) deployed at La Palma (Canary Islands), and operated by the HEGRA (High Energy Gamma Ray Astronomy) collaboration, was used for observations of the Monoceros Loop SNR region for a total of about 120 …

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TeVγ-ray light curve and energy spectrum of Mkn 421 during its 2001 flare as measured with HEGRA CT1

F. Aharonian, A. G. Akhperjanian, M. Beilicke, K. Bernlöhr et autres

In the first months of 2001 the AGN Mkn 421 showed highly variable, strong TeV activity at flux levels frequently exceeding 1 Crab. Here we present the light curve and energy spectrum of Mkn 421 as measured with the HEGRA stand alone …

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The technical performance of the HEGRA system of imaging air Cherenkov telescopes

G. Pühlhofer, O. Bolz, N. Götting, Andréas Heusler et autres

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VizieR Online Data Catalog: 2001 Flare of Mkn 421 in gamma-ray (Aharonian+ 2003)

F. Aharonian, A. G. Akhperjanian, M. Beilicke, Konrad Bernloehr et autres

Detection of TeV gamma-rays from the BL Lac 1ES 1959+650 in its low states and during a major outburst in 2002

F. Aharonian, A. G. Akhperjanian, M. Beilicke, K. Bernlöhr et autres

TeV γ -rays from the BL Lac object 1ES 1959+650 have been measured during the years 2000 and 2001 with a significance of 5.2 σ at a value of 5.3% of the Crab flux and in May 2002 during strong outbursts with …

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The technical performance of the HEGRA IACT system

G. Pühlhofer, O. Bolz, N. Götting, Andréas Heusler et autres

Between the beginning of 1997 and fall 2002, the HEGRA collaboration was operating a stereoscopic system of 4 (later 5) Imaging Atmospheric Cherenkov Telescopes (IACT) on the Canary Island La Palma. We review the calibration schemes which were developed for the system, …

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