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Your search keyword '"Werner, N."' showing total 9 results
Start Over Author "Werner, N." Journal space science reviews
9 results on '"Werner, N."'

2. Science with a Small Two-Band UV-Photometry Mission I: Mission Description and Follow-up Observations of Stellar Transients

Author

Werner, N., Řípa, J., Thöne, C., Münz, F., Kurfürst, P., Jelínek, M., Hroch, F., Benáček, J., Topinka, M., Lukes-Gerakopoulos, G., Zajaček, M., Labaj, M., Prišegen, M., Krtička, J., Merc, J., Pál, A., Pejcha, O., Dániel, V., Jon, J., Šošovička, R., Gromeš, J., Václavík, J., Steiger, L., Segiňák, J., Behar, E., Tarem, S., Salh, J., Reich, O., Ben-Ami, S., Barschke, M. F., Berge, D., Tohuvavohu, A., Sivanandam, S., Bulla, M., Popov, S., and Chang, Hsiang-Kuang

Published
2024
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7. Clusters of Galaxies: Beyond the Thermal View

Author

Kaastra, J. S., Bykov, A. M., Schindler, S., Bleeker, J. A. M., Borgani, S., Diaferio, A., Dolag, K., Durret, F., Nevalainen, J., Ohashi, T., Paerels, F. B. S., Petrosian, V., Rephaeli, Y., Richter, P., Schaye, J., and Werner, N.

Published
2008
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8. Hot Atmospheres, Cold Gas, AGN Feedback and the Evolution of Early Type Galaxies: A Topical Perspective.

Author

Werner, N., McNamara, B. R., Churazov, E., and Scannapieco, E.

Subjects
*ATMOSPHERE, *COLD gases, *MILKY Way, *X-ray spectra, *ACTIVE galactic nuclei
Abstract

Most galaxies comparable to or larger than the mass of the Milky Way host hot, X-ray emitting atmospheres, and many such galaxies are radio sources. Hot atmospheres and radio jets and lobes are the ingredients of radio-mechanical active galactic nucleus (AGN) feedback. While a consensus has emerged that such feedback suppresses cooling of hot cluster atmospheres, less attention has been paid to massive galaxies where similar mechanisms are at play. Observation indicates that the atmospheres of elliptical and S0 galaxies were accreted externally during the process of galaxy assembly and augmented significantly by stellar mass loss. Their atmospheres have entropy and cooling time profiles that are remarkably similar to those of central cluster galaxies. About half display filamentary or disky nebulae of cool and cold gas, much of which has likely cooled from the hot atmospheres. We review the observational and theoretical perspectives on thermal instabilities in galactic atmospheres and the evidence that AGN heating is able to roughly balance the atmospheric cooling. Such heating and cooling may be regulating star formation in all massive spheroids at late times. [ABSTRACT FROM AUTHOR]

Published
2019
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9. Clusters of Galaxies: Beyond the Thermal View

Author

Takaya Ohashi, Jelle Kaastra, F. Durret, Norbert Werner, Vahé Petrosian, Johan A. M. Bleeker, Yoel Rephaeli, Joop Schaye, Stefano Borgani, Jukka Nevalainen, Andrei M. Bykov, Sabine Schindler, Frits Paerels, Philipp Richter, Klaus Dolag, Antonaldo Diaferio, Kaastra, J. S., Bykov, A. M., Schindler, S., Bleeker, J. A. M., Borgani, Stefano, Diaferio, A., Dolag, K., Durret, F., Nevalainen, J., Ohashi, T., Paerels, F. B. S., Petrosian, V., Rephaeli, Y., Richter, P., Schaye, J., Werner, N., Astrophysics, and Dep Natuurkunde

Subjects
Structure formation, media_common.quotation_subject, Large-scale structure of universe, FOS: Physical sciences, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, clusters: general [Galaxies], 01 natural sciences, 0103 physical sciences, 010303 astronomy & astrophysics, galaxy clusters [X-rays], Galaxies: clusters: general, Intergalactic medium, X-rays: galaxy clusters, Astrophysics::Galaxy Astrophysics, media_common, Physics, Teamwork, 010308 nuclear & particles physics, Astrophysics (astro-ph), Astronomy, Subject (documents), Astronomy and Astrophysics, Thermal emission, Galaxy, Field (geography), Space and Planetary Science, Space Science
Abstract

We present the work of an international team at the International Space Science Institute (ISSI) in Bern that worked together to review the current observational and theoretical status of the non-virialised X-ray emission components in clusters of galaxies. The subject is important for the study of large-scale hierarchical structure formation and to shed light on the "missing baryon" problem. The topics of the team work include thermal emission and absorption from the warm-hot intergalactic medium, non-thermal X-ray emission in clusters of galaxies, physical processes and chemical enrichment of this medium and clusters of galaxies, and the relationship between all these processes. One of the main goals of the team is to write and discuss a series of review papers on this subject. These reviews are intended as introductory text and reference for scientists wishing to work actively in this field. The team consists of sixteen experts in observations, theory and numerical simulations., Comment: 6 pages, 1 figure, accepted for publication in Space Science Reviews, special issue "Clusters of galaxies: beyond the thermal view", Editor J.S. Kaastra, Chapter 1; work done by an international team at the International Space Science Institute (ISSI), Bern, organised by J.S. Kaastra, A.M. Bykov, S. Schindler & J.A.M. Bleeker

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