Results 31 to 40 of about 56,835 (159)

„Es wäre mir unmöglich nur ein halbes Jahr so zu leben wie er“: Encke, Humboldt und was wir schon immer über die neue Berliner Sternwarte wissen wollten

HiN - Alexander von Humboldt im Netz. Internationale Zeitschrift für Humboldt-Studien, 2013
Kein Abstract vorhanden.
Eberhard Knobloch
doaj   +1 more source

Hierarchical Star Formation in Nearby LEGUS Galaxies [PDF]

, 2014
Hierarchical structure in ultraviolet images of 12 late-type LEGUS galaxies is studied by determining the numbers and fluxes of nested regions as a function of size from ~1 to ~200 pc, and the number as a function of flux.
Adamo, Angela, Aloisi, Alessandra, Andrews, Jennifer, Annibali, Francesca, Bright, Stacey N., Calzetti, Daniela, Cignoni, Michele, Elmegreen, Bruce G., Elmegreen, Debra Meloy, Evans, Aaron S., Gallagher III, John S., Gouliermis, Dimitrios A., Grebel, Eva K., Hunter, Deidre A., Johnson, Kelsey, Kim, Hwi, Lee, Janice, Sabbi, Elena, Smith, Linda, Thilker, David, Tosi, Monica, Ubeda, Leonardo   +21 more
core   +2 more sources

The Tenth International Workshop on MULTIFREQUENCY BEHAVIOUR OF HIGH ENERGY COSMIC SOURCES Palermo, Italy, 2013

Acta Polytechnica CTU Proceedings, 2014
Organizing Institutions:Istituto di Astrofisica e Planetologia Spaziali IAPS-INAF, Roma, ItalyDpt de Cargas Utiles y Ciencias del Espacio, DCUCE-INTA Madrid, SpainE.O. Hulburt Center for Space Research, HCA-NRL, Washington D.C., USAMax-Planck Institut fr
Editorial, Foreword
doaj   +1 more source

225 Jahre UV‐Strahlung – Die Rekonstruktion des Ritter‐Experiments (1801) für Schule und Hochschule

CHEMKON, EarlyView.
Am 22. Februar 1801 gelang Johann Wilhelm Ritter in Jena der experimentelle Nachweis einer unsichtbaren Strahlung jenseits des violetten Bereichs des sichtbaren Spektrums. Als Indikator nutzte er die photochemische Schwärzung von Hornsilber (Silberchlorid) und erbrachte damit erstmals einen indirekten experimentellen Nachweis der ultravioletten ...
Tom Wagner, Holger Cartarius, Timo Mappes   +2 more
wiley   +1 more source

Interferometric Detection of Planets/Gaps in Protoplanetary Disks [PDF]

, 2002
We investigate the possibility to find evidence for planets in circumstellar disks by infrared and submillimeter interferometry. Hydrodynamical simulations of a circumstellar disk around a solar-type star with an embedded planet of 1 Jupiter mass are ...
Gueth, F., Henning, Th., Kley, W., Wolf, S.   +3 more
core   +1 more source

Three-dimensional Continuum Radiative Transfer Images of a Molecular Cloud Core Evolution

, 2004
We analyze a three-dimensional smoothed particle hydrodynamics simulation of an evolving and later collapsing pre-stellar core. Using a three-dimensional continuum radiative transfer program, we generate images at 7 micron, 15 micron, 175 micron, and 1.3
A. Bacmann, A. Burkert, Alves J., Andre P., B. Lang, Bacmann A., Bate M. R., Burkert A., J. Steinacker, Krumholz M. R., Th. Henning, Ward-Thompson D.   +11 more
core   +1 more source

Tycho Brahe's 1572 supernova as a standard type Ia explosion revealed from its light echo spectrum [PDF]

, 2008
Type Ia supernovae (SNe Ia) are thermonuclear explosions of white dwarf stars in close binary systems. They play an important role as cosmological distance indicators and have led to the discovery of the accelerated expansion of the Universe.
A Decourchelle, A Filippenko, A Filippenko, A Filippenko, A Rest, A Rest, AG Riess, B Schaefer, D Branch, D Kasen, H Völk, JB Doggett, K Nomoto, Ken’ichi Nomoto, L Wang, M Tanaka, Masaomi Tanaka, Miwa Goto, MM Phillips, O Krause, O Krause, Oliver Krause, P Nugent, P Ruiz-Lapuente, P Ruiz-Lapuente, PA Mazzali, S Mattila, S Perlmutter, S van den Bergh, Stephan Birkmann, T Brahe, Takashi Hattori, Tomonori Usuda, W Baade, W Hillebrandt, WB Sparks   +35 more
core   +1 more source

Fully Kinetic Simulations of Ion‐Acoustic Waves in Asymmetric Reconnection With Cold Ions

Geophysical Research Letters, Volume 53, Issue 5, 16 March 2026.
Abstract In collisionless plasma, ion‐acoustic wave (IAW) is an important candidate for enhancing resistivity and viscosity, yet their presence and role in magnetic reconnection remain poorly understood. Here, we employ 2.5‐D particle‐in‐cell simulations to investigate IAWs in asymmetric magnetopause reconnection involving a cold ion population ...
Liangjin Song, Meng Zhou, Liang Wang, Zhihong Zhong, Xinmin Li, Chuanfei Dong, Chuanpeng Hou, Rongxin Tang, Yongyuan Yi, Xiaohua Deng   +9 more
wiley   +1 more source

Pulse-to-pulse variability of bright accreting pulsars

, 2011
In addition to coherent pulsation, many accreting neutron stars exhibit flaring activity and strong aperiodic variability on time scales similar to or shorter than their pulsation period.
Klochkov, D., Rothschild, R. E., Santangelo, A., Staubert, R.   +3 more
core   +1 more source

Discovery and Initial Investigation of a New Low Surface Brightness Planetary Nebula Candidate at High Galactic Latitude

Astronomische Nachrichten, Volume 347, Issue 3, March 2026.
ABSTRACT Planetary nebulae represent a late evolutionary phase of low‐ to intermediate‐mass stars. In this article, we present the serendipitous discovery of a previously unknown, faint potential Galactic planetary nebula (PN) in the constellation Camelopardalis, identified during a survey‐inspection, aiming at the detection of dwarf companions of the ...
W. E. Celnik, P. Köchling, S. Kotov, J. Kozok, Y. Galata, L. Magrini, A. Moiseev, M. Nischang, C. Reese, P. Remmel, P. Riepe, T. Zilch, K. Werner   +12 more
wiley   +1 more source