Results 41 to 50 of about 300,638 (255)

New Near-infrared Period–Luminosity–Metallicity Relations for Galactic RR Lyrae Stars Based on Gaia EDR3 Parallaxes

The Astrophysical Journal, 2023
We present new period–luminosity and period–luminosity–metallicity relations for Galactic RR Lyrae stars based on a sample of 28 pulsators located at distances of up to 1.5 kpc from the Sun.
Bartłomiej Zgirski, Grzegorz Pietrzyński, Marek Górski, Wolfgang Gieren, Piotr Wielgórski, Paulina Karczmarek, Gergely Hajdu, Megan Lewis, Rolf Chini, Dariusz Graczyk, Mikołaj Kałuszyński, Weronika Narloch, Bogumił Pilecki, Gonzalo Rojas García, Ksenia Suchomska, Mónica Taormina   +15 more
doaj   +1 more source

AGN-Host Galaxy Connection: Morphology and Colours of X-ray Selected AGN at z < 2 [PDF]

, 2012
The connection between AGN and their host galaxies has been widely studied over recent years, showing it to be of great importance for providing answers to some fundamental questions related with AGN fueling mechanisms, their formation and evolution ...
A. Bongiovanni, A. Ederoclite, A. M. Pérez García, Abraham, Abraham, Adams, Alexander, Alonso-Herrero, Aretxaga, Baldry, Barcons, Barger, Barnes, Bershady, Bertin, Blanton, Blanton, Bolzonella, Brusa, Caccianiga, Calzetti, Cardamone, Cepa, Cepa, Choi, Ciotti, Ciotti, Cirasuolo, Cisternas, Civano, Conselice, Cox, Croton, Davies, Davis, De Ruiter, Della Ceca, Di Matteo, Dickey, Dwelly, E. Alfaro, Feldmann, Fernández Lorenzo, Ferrarese, Fiore, Furusawa, Gabor, Gebhardt, Georgakakis, Georgakakis, Georgakakis, Governato, Graham, Graham, Griffith, Grogin, H. Castañeda, Hasinger, Hasinger, Hasinger, Heckman, Hewett, Hickox, Ho, Hodgkin, Hopkins, Hopkins, Hopkins, Hopkins, Hopkins, Hopkins, Huertas-Company, Huertas-Company, J. Cepa, J. Gallego, J. I. González-Serrano, J. J. González, Kauffmann, Kauffmann, Kent, Kormendy, Kormendy, Lara-López, Lawrence, Lotz, M. A. Lara-López, M. Fernández Lorenzo, M. Huertas-Company, M. Pović, M. Sánchez-Portal, Magorrian, Mainieri, Mainieri, Marconi, Mateos, McLure, Melbourne, Mortier, Mukai, Nandra, Peng, Peng, Pierce, Pierce, Polletta, Pović, Pović, Reach, Robertson, Schawinski, Schawinski, Schawinski, Scoville, Shin, Silverman, Silverman, Simpson, Somerville, Springel, Springel, Steffen, Strüder, Surace, Sutherland, Sánchez, Tasca, Taylor, Treister, Tully, Turner, Ueda, Warren, Weiner, Wild, Wolf, Wolf, Wolf, Xue, Younes   +138 more
core   +6 more sources

Uncovering the Origin of Efficiency Roll‐Off in TADF OLEDs

Advanced Functional Materials, EarlyView.
OLEDs based on thermally activated delayed fluorescent (TADF) materials often suffer from a severe drop in efficiency at high brightness levels. This work presents a technique to uncover the source of this efficiency drop, and quantifies the exciton‐exciton and exciton‐polaron annihilation processes responsible for efficiency losses in our TADF OLEDs ...
Liam G. King, Kou Yoshida, Arvydas Ruseckas, Ifor D. W. Samuel   +3 more
wiley   +1 more source

Constraints on dark matter annihilation from the Event Horizon Telescope observations of M87*

Journal of High Energy Physics, 2022
The fast developments of radio astronomy open a new window to explore the properties of Dark Matter (DM). The recent direct imaging of the supermassive black hole (SMBH) at the center of M87 radio galaxy by the Event Horizon Telescope (EHT) collaboration
Guan-Wen Yuan, Zhan-Fang Chen, Zhao-Qiang Shen, Wen-Qing Guo, Ran Ding, Xiaoyuan Huang, Qiang Yuan   +6 more
doaj   +1 more source

Halide‐Dependent Photoluminescence and Heavy‐Atom Effects in Low‐Melting Organic–Inorganic Manganese Halides

Advanced Functional Materials, EarlyView.
Two pyridinium‐based ionic liquid templated hybrid manganese halides, (C4Py)2[MnCl4] and (C4Py)2[MnBr4], display similar bulk structures but show significantly different photoluminescence behaviors due to the bromine heavy‐atom effect. Their stable local Mn environments remain intact even in the molten state, allowing applications such as luminescence ...
Biswajit Bhattacharyya, Christian Balischewski, Jiyong Kim, Tiago Duarte, Lianshe Fu, Rute A.S. Ferreira, Alkit Beqiraj, Iuliia Mikulska, Diego Gianolio, Eric Sperlich, Felix Stete, Wouter Koopman, Christina Günter, Katlen Brennenstuhl, Daniel Van Opdenbosch, Cordt Zollfrank, Armin Wedel, Beth J. Murray, Małgorzata Swadźba‐Kwaśny, Tillmann Klamroth, Michael U. Kumke, Verónica de Zea Bermudez, Andreas Taubert   +22 more
wiley   +1 more source

Southern Hemisphere automated supernova search [PDF]

, 1995
The Perth Astronomy Research Group has developed an automated supernova search program, using the 61 cm Perth–Lowell reflecting telescope at Perth Observatory in Western Australia, equipped with a CCD camera.
Blair, D.G., Burman, R., Koch, R., Lynch, M.J., Martin, R., Verveer, A., Williams, A.J.   +6 more
core   +2 more sources

Chirality and Organization of Adsorbates Modify Surface Phonon Dynamics

Advanced Functional Materials, EarlyView.
Chirality and molecular organization are shown to influence surface phonon dynamics in gold films. Time‐resolved Joule heating measurements reveal that ordered homochiral monolayers increase the Debye temperature and disordered layers reduce it, while ordered racemic controls have no effect.
Meital Ozeri, Eugenia Pyurbeeva, Shira Yochelis, Jonas Fransson, Ronnie Kosloff, Oded Millo, Yossi Paltiel   +6 more
wiley   +1 more source

Results of the Photometric LSST Astronomical Time-series Classification Challenge (PLAsTiCC)

The Astrophysical Journal Supplement Series, 2023
Next-generation surveys like the Legacy Survey of Space and Time (LSST) on the Vera C. Rubin Observatory (Rubin) will generate orders of magnitude more discoveries of transients and variable stars than previous surveys.
R. Hložek, A. I. Malz, K. A. Ponder, M. Dai, G. Narayan, E. E. O. Ishida, T. Allam Jr, A. Bahmanyar, X. Bi, R. Biswas, K. Boone, S. Chen, N. Du, A. Erdem, L. Galbany, A. Garreta, S. W. Jha, D. O. Jones, R. Kessler, M. Lin, J. Liu, M. Lochner, A. A. Mahabal, K. S. Mandel, P. Margolis, J. R. Martínez-Galarza, J. D. McEwen, D. Muthukrishna, Y. Nakatsuka, T. Noumi, T. Oya, H. V. Peiris, C. M. Peters, J. F. Puget, C. N. Setzer, Siddhartha, S. Stefanov, T. Xie, L. Yan, K.-H. Yeh, W. Zuo   +40 more
doaj   +1 more source

Orbital Geometry‐Governed Response of Pressure‐Tunable Quantum Defects in hBN

Advanced Functional Materials, EarlyView.
Defects in hBN act as ultrasensitive quantum manometers when the energy of the intradefect optical transitions is modified by lattice compression. The orbital geometry of the electron wave functions governs how electron hopping and Coulomb interactions react uniquely to the reduction of the van der Waals gap and in‐plane compression, leading to robust ...
Magdalena Grzeszczyk, Danis I. Badrtdinov, Kenji Watanabe, Takashi Taniguchi, Cyrus E. Dreyer, Malte Rösner, Maciej Koperski   +6 more
wiley   +1 more source

Scientific photography and astronomy: Technology applied to understanding the universe

Mètode Science Studies Journal: Annual Review
In 1925, Edwin Hubble took the first step towards increasing the size of the known universe by several orders of magnitude using the precarious photographic methods available at the time: glass plates and photosensitive emulsions.
Fernando Abalos Vazquez, Javier Ábalos
doaj   +1 more source