Zobrazeno 1 - 10
of 718
pro vyhledávání: '"Leutenegger, M"'
Autor:
Das, B., Petit, V., Nazé, Y., Corcoran, M. F., Cohen, D. H., Biswas, A., Chandra, P., David-Uraz, A., Leutenegger, M. A., Neiner, C., Pablo, H., Paunzen, E., Shultz, M. E., ud-Doula, A., Wade, G. A.
We report detailed X-ray observations of the unique binary system $\epsilon$ Lupi, the only known short-period binary consisting of two magnetic early-type stars. The components have comparably strong, but anti-aligned magnetic fields. The orbital an
Externí odkaz:
http://arxiv.org/abs/2304.12882
We present XMM-Newton Reflection Grating Spectrometer observations of pairs of X-ray emission line profiles from the O star ζ Pup that originate from the same He-like ion. The two profiles in each pair have different shapes and cannot both be consis
Externí odkaz:
http://opus.kobv.de/ubp/volltexte/2008/1808/
By quantitatively fitting simple emission line profile models that include both atomic opacity and porosity to the Chandra X-ray spectrum of ζ Pup, we are able to explore the trade-offs between reduced mass-loss rates and wind porosity. We find that
Externí odkaz:
http://opus.kobv.de/ubp/volltexte/2008/1811/
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:
Leutenegger, M. A., Eckart, M. E., Moseley, S. J., Rohrbach, S. O., Black, J. K., Chiao, M. P., Kelley, R. L., Kilbourne, C. A., Porter, F. S.
X-ray calorimeters routinely achieve very high spectral resolution, typically a few eV full width at half maximum (FWHM). Measurements of calorimeter line shapes are usually dominated by the natural linewidth of most laboratory calibration sources. T
Externí odkaz:
http://arxiv.org/abs/2008.06161
Publikováno v:
A&A 644, C1 (2020)
In high mass X-ray binaries (HMXBs), an accreting compact object orbits a high mass star which loses mass through a dense and inhomogeneous wind. Using the compact object as an X-ray backlight, the time variability of the absorbing column density in
Externí odkaz:
http://arxiv.org/abs/2006.16216
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
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:
Simionescu, A., Nakashima, S., Yamaguchi, H., Matsushita, K., Mernier, F., Werner, N., Tamura, T., Nomoto, K., de Plaa, J., Leung, S. -C., Bamba, A., Bulbul, E., Eckart, M. E., Ezoe, Y., Fabian, A. C., Fukazawa, Y., Gu, L., Ichinohe, Y., Ishigaki, M. N., Kaastra, J. S., Kilbourne, C., Kitayama, T., Leutenegger, M., Loewenstein, M., Maeda, Y., Miller, E. D., Mushotzky, R. F., Noda, H., Pinto, C., Porter, F. S., Safi-Harb, S., Sato, K., Takahashi, T., Ueda, S., Zha, S.
High-resolution spectroscopy of the core of the Perseus Cluster of galaxies, using the $Hitomi$ satellite above 2 keV and the $XMM$-$Newton$ Reflection Grating Spectrometer at lower energies, provides reliable constraints on the abundances of O, Ne,
Externí odkaz:
http://arxiv.org/abs/1806.00932
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