Results 81 to 90 of about 86,915 (297)

Tracing out the Northern Tidal Stream of the Sagittarius Dwarf Spheoridal Galaxy

, 2003
The main aim of this paper is to report two new detections of tidal debris in the northern stream of the Sagittarius dwarf galaxy located at 45 arcdeg and 55 arcdeg from the center of galaxy.
Antonio Aparicio, Arnold R., Bertelli G., David Martinez‐Delgado, Fux R., Gomez-Flechoso M. A., Ibata R., M. Angeles Gomez‐Flechoso, Ricardo Carrera, Sellwood J. A.   +9 more
core   +3 more sources

Observing the very low-surface brightness dwarfs in a deep field in the VIRGO cluster: constraints on Dark Matter scenarios [PDF]

, 2017
We report the discovery of 11 very faint (r< 23), low surface brightness ({\mu}_r< 27 mag/arcsec^2) dwarf galaxies in one deep field in the Virgo cluster, obtained by the prime focus cameras (LBC) at the Large Binocular Telescope (LBT).
Fontana, A., Giallongo, E., Grazian, A., Menci, N., Paris, D., Pentericci, L.   +5 more
core   +2 more sources

Photoswitching Conduction in Framework Materials

Advanced Functional Materials, EarlyView.
This mini‐review summarizes recent advances in state‐of‐the‐art proton and electron conduction in framework materials that can be remotely and reversibly switched on and off by light. It discusses the various photoswitching conduction mechanisms and the strategies employed to enhance photoswitched conductivity.
Helmy Pacheco Hernandez, Stefan Hecht, Wolfgang Wenzel, Lars Heinke, Mariana Kozlowska   +4 more
wiley   +1 more source

Darwin Tames an Andromeda Dwarf: Unraveling the Orbit of NGC 205 Using a Genetic Algorithm

, 2008
NGC 205, a close satellite of the M31 galaxy, is our nearest example of a dwarf elliptical galaxy. Photometric and kinematic observations suggest that NGC 205 is undergoing tidal distortion from its interaction with M31.
Bender F. D., G. Laughlin, Geehan J. J., K. M. Howley, K. V. Johnston, M. Geha, Miyamoto M., P. Guhathakurta, Pfleiderer J., R. M. Montgomery, Seguin P.   +10 more
core   +1 more source

Brightness of the Qianfan Satellites

Observed magnitudes of Qianfan spacecraft range from 4 when they are near zenith to 8 when low in the sky. Nearly all of the observations can be modeled with a nadir-facing flat antenna panel and the underside of a zenith-facing solar array, both with Lambertian reflectance properties.
Mallama, Anthony, Cole, Richard E., Dorreman, Bram, Harrington, Scott, James, Nick   +4 more
openaire   +2 more sources

Stoma‐Shell Nanoarchitecture for Enhanced Plasma Confinement Catalysis in Synthesis of Ethanol from CO2

Advanced Functional Materials, EarlyView.
High‐energy electron impact in plasma catalysis often causes excessive dissociation of active intermediates, limiting C2+ product selectivity. To address this challenge, a bio‐inspired stoma‐shell nanoarchitecture is designed to decouple electron impact from catalytic reaction zones.
Nan Zou, Zhiliang Dong, Tsun‐Kong Sham, Xiaonian Li, Ying Zheng, Ting Qiu   +5 more
wiley   +1 more source

Influence of the Earth on the background and the sensitivity of the GRM and ECLAIRs instruments aboard the Chinese-French mission SVOM

, 2012
SVOM (Space-based multi-band astronomical Variable Object Monitor) is a future Chinese-French satellite mission which is dedicated to Gamma-Ray Burst (GRB) studies.
A Moretti, B Cordier, Bertrand Cordier, Bobing Wu, D Band, DE Gruber, DL Band, DL Band, Donghua Zhao, E Churazov, G Ghirlanda, G Li, IG Usoskin, J Paul, Jiangtao Liu, Liming Song, M Ajello, O Godet, P Mandrou, P Sreekumar, Patrick Sizun, S Agostinelli, S Sazonov, Stéphane Schanne, Y Kaneko, Y-W Dong, Yongwei Dong   +26 more
core   +1 more source

The Dominance of Metal-Rich Streams in Stellar Halos: A Comparison Between Substructure in M31 and Lambda-CDM Models [PDF]

, 2009
Extensive photometric and spectroscopic surveys of the Andromeda galaxy (M31) have discovered tidal debris features throughout M31's stellar halo. We present stellar kinematics and metallicities in fields with identified substructure from our on-going ...
Font, Andreea S., Gilbert, Karoline M., Guhathakurta, Puragra, Johnston, Kathryn V.   +3 more
core   +2 more sources

IAU CPS Satellite Optical Brightness Recommendation: Rationale

Research Notes of the AAS
Abstract In this Note, we discuss the rationale behind the IAU CPS’s recommendation on satellite brightness for objects in low Earth orbit (LEO). Specifically, we clarify the reasoning behind the chosen altitude dependence and the limitations of this choice.
Aaron C. Boley, Richard Green, Meredith L. Rawls, Siegfried Eggl   +3 more
openaire   +1 more source

Infrared Nanocrystals for Space Application: Hardness to Irradiations

Advanced Functional Materials, EarlyView.
This article investigates infrared HgTe nanocrystals under X‐ray and ion irradiation, revealing remarkable radiation hardness. It uncovers distinct degradation mechanisms and shows that the nanomaterial outperforms integrated electronics. The results position colloidal nanocrystals as promising candidates for resilient space and harsh‐environment ...
Alexandre Neyret, Dario Mastrippolito, Bingbing Xia, Adrien Khalili, Maxime Lebreton, Giorgia Strobbia, Albin Colle, Marco Paye, Mariarosa Cavallo, Erwan Bossavit, Claire Abadie, Yoann Prado, Debora Pierucci, Victor Parahyba, Francois Coursaget, David Darson, Emrick Briand, Ian Vickridge, Stephane Demiguel, Sebastien Massenot, Jean‐Marc Belloir, Vincent Goiffon, Emmanuel Lhuillier   +22 more
wiley   +1 more source