A
A. Sievers
Publications - 84
Citations - 3269
A. Sievers is an academic researcher. The author has contributed to research in topics: Blazar & Telescope. The author has an hindex of 35, co-authored 76 publications receiving 3073 citations.
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Journal ArticleDOI
Simultaneous Planck, Swift, and Fermi observations of X-ray and γ-ray selected blazars
Paolo Giommi,G. Polenta,G. Polenta,Anne Lähteenmäki,Anne Lähteenmäki,D. J. Thompson,M. Capalbi,S. Cutini,Dario Gasparrini,J. González-Nuevo,Jonathan León-Tavares,M. López-Caniego,Mn Mazziotta,C. Monte,C. Monte,M. Perri,S. Rainò,S. Rainò,G. Tosti,G. Tosti,Andrea Tramacere,F. Verrecchia,Hugh D. Aller,M. F. Aller,E. Angelakis,Denis Bastieri,Denis Bastieri,Andrei Berdyugin,Anna Bonaldi,Laura Bonavera,Laura Bonavera,Carlo Burigana,David N. Burrows,S. Buson,E. Cavazzuti,G. Chincarini,Sergio Colafrancesco,L. Costamante,F. Cuttaia,Filippo D'Ammando,G. de Zotti,G. de Zotti,M. Frailis,Lars Fuhrmann,S. Galeotta,F. Gargano,N. Gehrels,Nicola Giglietto,Nicola Giglietto,Francesco Giordano,Marcello Giroletti,E. Keihänen,O. King,Thomas P. Krichbaum,Anthony Lasenby,N. Lavonen,Charles R. Lawrence,C. Leto,Elina Lindfors,Nazzareno Mandolesi,Marcella Massardi,Walter Max-Moerbeck,Peter F. Michelson,M. G. Mingaliev,Paolo Natoli,Paolo Natoli,Paolo Natoli,I. Nestoras,E. Nieppola,E. Nieppola,Kari Nilsson,B. Partridge,Vasiliki Pavlidou,T. J. Pearson,Pietro Procopio,Jörg P. Rachen,Anthony C. S. Readhead,R. Reeves,A. Reimer,R. Reinthal,S. Ricciardi,Joseph L. Richards,D. Riquelme,Jari Saarinen,Anna Sajina,M. Sandri,P. Savolainen,A. Sievers,A. Sillanpää,Yu. V. Sotnikova,Mark Stevenson,G. Tagliaferri,L. O. Takalo,Joni Tammi,D. Tavagnacco,Luca Terenzi,L. Toffolatti,Merja Tornikoski,Corrado Trigilio,M. Turunen,G. Umana,H. Ungerechts,F. Villa,Jingwen Wu,Andrea Zacchei,J. A. Zensus,Xu Zhou +106 more
TL;DR: In this paper, simultaneous Planck, Swift, Fermi, and ground-based data for 105 blazars belonging to three samples with flux limits in the soft X-ray, hard Xray, and gamma-ray bands, with additional 5 GHz flux-density limits to ensure a good probability of a Planck detection.
Radio Emission from Galactic and Extragalactic Compact Sources
H. Ungerechts,C. Kramer,B. Lefloch,S. Leon,F. Masset,R. Moreno,Gabriel Paubert,D. Reynaud,A. Sievers,Wolfgang Wild +9 more
Journal ArticleDOI
Detection of significant cm to sub-mm band radio and γ-ray correlated variability in Fermi bright blazars
Lars Fuhrmann,Stefan Larsson,James Chiang,E. Angelakis,J. A. Zensus,I. Nestoras,Thomas P. Krichbaum,H. Ungerechts,A. Sievers,Vasiliki Pavlidou,A. C. S. Readhead,Walter Max-Moerbeck,T. J. Pearson +12 more
TL;DR: In this paper, a cross-correlation analysis between radio and γ-ray signals is presented, showing that radio lagging γ rays is a significant phenomenon in the frequency-dependent frequency domain with a frequency dependence τ(r, γ) ∈ ν^(−1), in good agreement with jet opacity.
Proceedings ArticleDOI
Bolometer array development at the Max-Planck-Institut fuer Radioastronomie
Ernst Kreysa,Hans-Peter Gemuend,J. Gromke,C. G. T. Haslam,Lothar A. Reichertz,Eugene E. Haller,Jeffrey W. Beeman,Volkert Hansen,A. Sievers,R. Zylka +9 more
TL;DR: In this paper, the authors present the history of the development, general aspects of the bolometer arrays, including the coupling to the telescope, and the status of work in progress at the Max-Planck-Institut fur Radioastronomie (MPIfR).
Journal ArticleDOI
High angular resolution Sunyaev-Zel’dovich observations of MACS J1423.8+2404 with NIKA: Multiwavelength analysis
R. Adam,R. Adam,Barbara Comis,I. Bartalucci,A. Adane,Peter A. R. Ade,Ph. André,Monique Arnaud,Alexandre Beelen,Benoit Belier,Alain Benoit,Aurelien Bideaud,N. Billot,O. Bourrion,Martino Calvo,A. Catalano,Gregoire Coiffard,A. D'Addabbo,A. D'Addabbo,F.-X. Désert,Simon Doyle,Johannes Goupy,B. Hasnoun,Israel Hermelo,Carsten Kramer,Guilaine Lagache,Samuel Leclercq,J. F. Macías-Pérez,J. Martino,Philip Daniel Mauskopf,Philip Daniel Mauskopf,F. Mayet,Alessandro Monfardini,F. Pajot,Enzo Pascale,L. Perotto,Etienne Pointecouteau,Etienne Pointecouteau,Nicolas Ponthieu,G. W. Pratt,V. Revéret,A. Ritacco,L. Rodriguez,Giorgio Savini,Karl Schuster,A. Sievers,Sébastien Triqueneaux,Carole Tucker,R. Zylka +48 more
TL;DR: In this article, the NIKA data were combined with Herschel satellite data to study the SZ effect of the submm point source contaminants, and a joint reconstruction of the ICM electronic pressure and density was performed by combining NIKa, Planck, XMM-Newton and Chandra data, focussing on the impact of the radio and submm sources on the reconstructed pressure profile.