Zobrazeno 1 - 10
of 17
pro vyhledávání: '"Kreikenbohm, Annika"'
Active galactic nuclei (AGN) are among the brightest and most frequent sources on the extragalactic X-ray and gamma-ray sky. Their central supermassive blackhole generates an enormous luminostiy through accretion of the surrounding gas. A few AGN har
Autor:
Kreikenbohm, Annika
Where do cosmic X-rays come from? Every new unidentified X-ray source could potentially revolutionize our understanding of the universe. The international collaborative astronomy project EXTraS aimed at automatically classifying new sources of X-ray
Externí odkaz:
http://arxiv.org/abs/2101.03019
Autor:
Gatuzz, Efraín, Kh., S. Rezaei, Kallman, Timothy R., Kreikenbohm, Annika, Oertel, Mirjam, Wilms, J., García, Javier A.
We present a three-dimensional map of the hydrogen density distribution in the Galactic interstellar medium. The hydrogen equivalent column densities were obtained from the Exploring the X-ray Transient and variable Sky project ({\sc EXTraS}) which p
Externí odkaz:
http://arxiv.org/abs/1806.11133
Autor:
Krauß, Felicia, Wilms, Joern, Kadler, Matthias, Ojha, Roopesh, Schulz, Robert, Trüstedt, Jonas, Edwards, Philip G., Stevens, Jamie, Ros, Eduardo, Baumgartner, Wayne, Beuchert, Tobias, Blanchard, Jay, Buson, Sara, Carpenter, Bryce, Dauser, Thomas, Falkner, Sebastian, Gehrels, Neil, Gräfe, Christina, Gulyaev, Sergei, Hase, Hayo, Horiuchi, Shinji, Kreikenbohm, Annika, Kreykenbohm, Ingo, Langejahn, Marcus, Leiter, Katharina, Lovell, Jim E. J., Müller, Cornelia, Natusch, Tim, Nesci, Roberto, Pursimo, Tapio, Phillips, Chris, Plötz, Christian, Quick, Jonathan, Tzioumis, Anastasios K., Weston, Stuart
Publikováno v:
A&A 591, A130 (2016)
Simultaneous broadband spectral and temporal studies of blazars are an important tool for investigating active galactic nuclei (AGN) jet physics. We study the spectral evolution between quiescent and flaring periods of 22 radio-loud AGN through multi
Externí odkaz:
http://arxiv.org/abs/1605.00841
Autor:
Kreikenbohm, Annika, Schulz, Robert, Kadler, Matthias, Wilms, Jörn, Markowitz, Alex, Chang, Chin Shin, Carpenter, Bryce, Elsässer, Dominik, Gehrels, Neil, Mannheim, Karl, Müller, Cornelia, Ojha, Roopesh, Ros, Eduardo, Trüstedt, Jonas
Publikováno v:
A&A 585, A91 (2016)
As part of the TANAMI multiwavelength progam, we discuss new X-ray observations of the $\gamma$-ray and radio-loud Narrow Line Seyfert galaxy ($\gamma$-NLS1) PKS 2004-447. The active galaxy is a member of a small sample of radio-loud NLS1s detected i
Externí odkaz:
http://arxiv.org/abs/1509.03735
Autor:
Kreikenbohm, Annika, Kadler, Matthias, Wilms, Jörn, Schulz, Robert, Müller, Cornelia, Ojha, Roopesh, Ros, Eduardo, Mannheim, Karl, Elsässer, Dominik
We present preliminary results of the X-ray analysis of XMM-Newton and Swift observations as part of a multi-wavelength monitoring campaign in 2012 of the radio-loud narrow line Seyfert 1 galaxy PKS 2004-447. The source was recently detected in gamma
Externí odkaz:
http://arxiv.org/abs/1309.3933
Autor:
Tibolla, Omar, Kaufmann, Sarah, Foschini, Luigi, Mannheim, Karl, Zhang, Shu, Li, Jian, Angelakis, Emmanouil, Fuhrmann, Lars, Haeusner, Paul, Kania, Jannik, Elsaesser, Dominik, Kreikenbohm, Annika, Schulz, Robert, Kadler, Matthias
Narrow-Line Seyfert 1 galaxies have been established as a new class of gamma-ray emitting AGN with relatively low black hole masses, but near-Eddington accretion rates. Other extragalactic gamma-ray sources observed so far such as Flat Spectrum Radio
Externí odkaz:
http://arxiv.org/abs/1306.4017
Autor:
Gokus, Andrea, Kreikenbohm, Annika, Leiter, Katharina, Bretz, Thomas, Dauser, Thomas, Dorner, Daniela, Elsaesser, Dominik, Eppel, Florian, Heßdörfer, Jonas, Kadler, Matthias, Kraus, Alexander, Kreter, Michael, Kreykenbohm, Ingo, Langejahn, Marcus, Mannheim, Karl, Thalhammer, Philipp, Wilms, Joern, FACT Collaboration, Arbet Engels, Axel, Baack, Dominik, Balbo, Matteo, Biland, Adrian, Buss, Jens, Eisenberger, Laura, Hildebrand, Dorothée, Iotov, Roman, Kalenski, Adelina, Mitchell, Alison, Neise, Dominik, Noethe, Maximilian, Paravac, Aleksander, Rhode, Wolfgang, Schleicher, Bernd, Sliusar, Vitalii, Walter, Roland
Publikováno v:
PoS: Proceedings of Science, 395
37th International Cosmic Ray Conference (ICRC 2021)
37th International Cosmic Ray Conference (ICRC 2021)
The blazar Mrk 421 shows frequent, short flares in the TeV energy regime. Due to the fast nature of such episodes, we often fail to obtain sufficient simultaneous information about flux variations in several energy bands. To overcome this lack of mul
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2695e66b05b7c6f1f580b4603d7824e4
https://hdl.handle.net/20.500.11850/524186
https://hdl.handle.net/20.500.11850/524186
Autor:
Frank, Florian, Kreikenbohm, Annika, Schwanke, Hagen, Stolzenberger, Christoph, Wolf, Nicole, Trefzger, Thomas
Im Beitrag werden zunächst Herausforderungen kognitiver, affektiver und interpersoneller Natur in der naturwissenschaftlichen Lehre im Bereich Elektrizität vorgestellt. Gestützt auf die Cognitive Load Theory, die Cognitive Theory of Multimedia Lea
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c7b1c3fa1ed7d71bd47b0ca7b0e388d3