Zobrazeno 1 - 10
of 288
pro vyhledávání: '"Hell N"'
Autor:
Diez, C. M., Grinberg, V., Fürst, F., Mellah, I. El, Zhou, M., Santangelo, A., Martínez-Núñez, S., Amato, R., Hell, N., Kretschmar, P.
Publikováno v:
A&A 674, A147 (2023)
High-Mass X-ray Binaries (HMXBs) offer a unique opportunity for the investigation of accretion onto compact objects and of wind structure in massive stars. A key source for such studies is the bright neutron star HMXB Vela X-1 whose convenient physic
Externí odkaz:
http://arxiv.org/abs/2303.09631
Autor:
Stierhof, J., Kühn, S., Winter, M., Micke, P., Steinbrügge, R., Shah, C., Hell, N., Bissinger, M., Hirsch, M., Ballhausen, R., Lang, M., Gräfe, C., Wipf, S., Cumbee, R., Betancourt-Martinez, G. L., Park, S., Niskanen, J., Chung, M., Porter, F. S., Stöhlker, T., Pfeifer, T., Brown, G. V., Bernitt, S., Hansmann, P., Wilms, J., López-Urrutia, J. R. Crespo, Leutenegger, M. A.
A key requirement for the correct interpretation of high-resolution X-ray spectra is that transition energies are known with high accuracy and precision. We investigate the K-shell features of Ne, CO$_2$, and SF$_6$ gases, by measuring their photo io
Externí odkaz:
http://arxiv.org/abs/2203.03725
Autor:
Amato, R., Grinberg, V., Hell, N., Bianchi, S., Pinto, C., D'Aí, D., Del Santo, M., Mineo, T., Santangelo, A.
Publikováno v:
A&A 648, A105 (2021)
The Supergiant X-ray binary Vela X-1 represents one of the best astrophysical sources to investigate the wind environment of a O/B star irradiated by an accreting neutron star. Previous studies and hydrodynamic simulations of the system revealed a cl
Externí odkaz:
http://arxiv.org/abs/2102.12164
Autor:
Martínez-Chicharro, M., Grinberg, V., Torrejón, J. M., Schulz, N., Oskinova, L., Nowak, M., Fürst, F., Hell, N., Hainich, R.
We present an analysis of the first observation of the iconic High Mass X-ray Binary \so with the \chandra High Energy Transmission Gratings during an X-ray eclipse. The goal of the observation was to study the structure/physical conditions in the cl
Externí odkaz:
http://arxiv.org/abs/2012.11901
Publikováno v:
A&A 643, A109 (2020)
High mass X-ray binaries hold the promise of giving us understanding of the structure of the winds of their supermassive companion stars by using the emission from the compact object as a backlight to evaluate the variable absorption in the structure
Externí odkaz:
http://arxiv.org/abs/2008.08159
Autor:
Lomaeva, M., Grinberg, V., Guainazzi, M., Hell, N., Bianchi, S., Kühnel, M. Bissinger né, Fürst, F., Kretschmar, P., Martínez-Chicharro, M., Martínez-Núñez, S., Torrejón, J. M.
Publikováno v:
A&A 641, A144 (2020)
We present a $\sim$130 ks observation of the prototypical wind-accreting, high-mass X-ray binary Vela X-1 collected with XMM-Newton at orbital phases between 0.12 and 0.28. A strong flare took place during the observation that allows us to investigat
Externí odkaz:
http://arxiv.org/abs/2007.07260
Autor:
Leutenegger, M. A., Kühn, S., Micke, P., Steinbrügge, R., Stierhof, J., Shah, C., Hell, N., Bissinger, M., Hirsch, M., Ballhausen, R., Lang, M., Gräfe, C., Wipf, S., Cumbee, R., Betancourt-Martinez, G. L., Park, S., Yerokhin, V. A., Surzhykov, A., Stolte, W. C., Niskanen, J., Chung, M., Porter, F. S., Stöhlker, T., Pfeifer, T., Wilms, J., Brown, G. V., López-Urrutia, J. R. Crespo, Bernitt, S.
Publikováno v:
Phys. Rev. Lett. 125, 243001 (2020)
We demonstrate a widely applicable technique to absolutely calibrate the energy scale of x-ray spectra with experimentally well-known and accurately calculable transitions of highly charged ions, allowing us to measure the K-shell Rydberg spectrum of
Externí odkaz:
http://arxiv.org/abs/2003.13838
Akademický článek
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Autor:
Betancourt-Martinez, G. L., Beiersdorfer, P., Brown, G. V., Cumbee, R. S., Hell, N., Kelley, R. L., Kilbourne, C. A., Leutenegger, M. A., Lockard, T. E., Porter, F. S.
Publikováno v:
The Astrophysical Journal Letters, 868:L17 (8pp), 2018 December 1
We present the first high-resolution laboratory spectra of X-ray emission following L-shell charge exchange between nickel ions and neutral H2 and He. We employ the commonly used charge exchange models found in XSPEC and SPEX, ACX and SPEX-CX, to sim
Externí odkaz:
http://arxiv.org/abs/1811.12411
Autor:
Grinberg, V., Hell, N., Mellah, I. El, Neilsen, J., Sander, A. A. C., Leutenegger, M., Fürst, F., Huenemoerder, D. P., Kretschmar, P., Kühnel, M., Martínez-Núñez, S., Niu, S., Pottschmidt, K., Schulz, N. S., Wilms, J., Nowak, M. A.
Publikováno v:
A&A 608, A143 (2017)
Bright and eclipsing, the high-mass X-ray binary Vela X-1 offers a unique opportunity to study accretion onto a neutron star from clumpy winds of O/B stars and to disentangle the complex accretion geometry of these systems. In Chandra-HETGS spectrosc
Externí odkaz:
http://arxiv.org/abs/1711.06743