Results 51 to 60 of about 54,429 (269)

Abundance Ratios in Dwarf Elliptical Galaxies [PDF]

Proceedings of the International Astronomical Union, 2016
AbstractThe aim of this study is to determine abundance ratios and star formation histories (SFH) of dwarf ellipticals in the nearby Virgo cluster. We perform a stellar population analysis of 39 dEs and study them using index-index and scaling relations. We find an unusual behaviour where [Na/Fe] is under-abundant w.r.t.
Sen, Seyda, Peletier, Reynier F., Toloba, Elisa, Mentz, Jaco J.   +3 more
openaire   +4 more sources

A Photometric Study of Giant Ellipticals and Their Stellar Halos With VST

Galaxies, 2017
Observations of diffuse starlight in the outskirts of galaxies are thought to be a fundamental source of constraints on the cosmological context of galaxy assembly in the Λ CDM model.
Marilena Spavone, Massimo Capaccioli, Nicola R. Napolitano, Enrichetta Iodice, Aniello Grado, Luca Limatola, Andrew P. Cooper, Michele Cantiello, Duncan A. Forbes, Maurizio Paolillo, Pietro Schipani   +10 more
doaj   +1 more source

Survey on AI‐Enabled Computer Vision Technologies and Applications for Space Robotic Missions

Journal of Field Robotics, EarlyView.
ABSTRACT This survey provides a comprehensive overview of recent advancements and challenges in Artificial Intelligence (AI)‐enabled computer vision (CV) techniques for space robotic missions, spanning critical phases such as Entry, Descent, and Landing (EDL), orbital operations, and planetary surface exploration.
Maciej Quoos, Steven Kay, Julia Wajoras, Robert Field, Evridiki V. Ntagiou, Fakher Mohammad, Yang Gao   +6 more
wiley   +1 more source

Abundance ratios in dwarf elliptical galaxies [PDF]

Monthly Notices of the Royal Astronomical Society, 2017
We determine abundance ratios of 37 dwarf ellipticals (dEs) in the nearby Virgo cluster. This sample is representative of the early-type population of galaxies in the absolute magnitude range -19.0 < Mr < -16.0. We analyze their absorption line-strength indices by means of index-index diagrams and scaling relations and use the stellar population ...
Şen, Ş., Peletier, R. F., Boselli, A., den Brok, M., Falcón-Barroso, J., Hensler, G., Janz, J., Laurikainen, E., Lisker, T., Mentz, J. J., Paudel, S., Salo, H., Sybilska, A., Toloba, E., van de Ven, G., Vazdekis, A., Yesilyaprak, C.   +16 more
openaire   +9 more sources

Detection of a Star Forming Galaxy in the Center of a Low-Mass Galaxy Cluster

, 2018
Brightest Cluster Galaxies (BCGs) residing in the centers of galaxy clusters are typically quenched giant ellipticals. A recent study hinted that star-forming galaxies with large disks, so-called superluminous spirals and lenticulars, are the BCGs of a ...
Andrade-Santos, Felipe, Bogdan, Akos, Forman, William R., Jones, Christine, Kovacs, Orsolya E., Kraft, Ralph P., Lovisari, Lorenzo   +6 more
core   +1 more source

On the Origin of Density Cusps in Elliptical Galaxies [PDF]

, 1998
We investigated the dynamical reaction of the central region of galaxies to a falling massive black hole by N-body simulations. As the initial galaxy model, we used an isothermal King model and placed a massive black hole at around the half-mass radius ...
Junichiro Makino, Makino J., Taro Nakano
core   +3 more sources

Improving Cycle Life and Capacity Retention in PVMPO‖Li Dual‐Ion Lithium‐Organic Batteries Using an EC‐Free and FEC Additive Containing Electrolyte

Small Methods, EarlyView.
The major bottleneck of PVMPO‐based positive electrodes is electrode degradation during extended cycling with EC‐containing electrolytes. This issue is mitigated by using EC‐free electrolytes with FEC additives, which exhibit reduced interfacial resistance, fewer surface cracks, improved capacity retention, and suppressed electrode degradation, thereby
Sathiya Priya Panjalingam, Somayeh Ahadi, Jakob Michael Hesper, Uta Rodehorst, Sascha Nowak, Birgit Esser, Martin Winter, Peter Bieker   +7 more
wiley   +1 more source

The size evolution of elliptical galaxies [PDF]

Monthly Notices of the Royal Astronomical Society, 2014
11 pages, 8 figures, 1 table, submitted to ...
Xie, L., Guo, Q., Cooper, A. P., Frenk, C. S., Li, R., Gao, L.   +5 more
openaire   +3 more sources

Hubble Space Telescope Imaging of the CFRS and LDSS Redshift Surveys---III. Field elliptical galaxies at 0.2 < z < 1.0

, 1999
Surface photometry has been performed on a sample of 46 field elliptical galaxies. These galaxies are described well by a deVaucouleurs R^{1/4} profile. The sample was selected from the combined Canada-France and LDSS redshift surveys and spans the range
Aragon-Salamanca, Barger, Barnes, Barrientos, Baugh, Bender, Bender, Bower, Brinchmann, Courteau, D. Crampton, David Schade, de Vaucouleurs, Dressler, Driver, Ellis, Ellis, Forbes, Franceschini, François Hammer, Guzman, Hammer, Hau, Im, Jarle Brinchmann, Jorgensen, K. Glazebrook, Kauffman, Kauffmann, Kauffmann, Kelson, L. Tresse, Larson, Le Fèvre, Lilly, Marzke, Matthew Colless, Menanteau, Mobasher, Negroponte, O. Le Fèvre, Pahre, Pahre, Patton, Press, R. Abraham, R. S. Ellis, S. J. Lilly, Scalo, Schade, Schade, Schade, Silva, Silva, Stanford, Tom Broadhurst, Totani, van der Kruit, van Dokkum, van Dokkum, White   +60 more
core   +2 more sources

Spaceborne and spaceborn: Physiological aspects of pregnancy and birth during interplanetary flight

Experimental Physiology, EarlyView.
Abstract Crewed interplanetary return missions that are on the planning horizon will take years, more than enough time for initiation and completion of a pregnancy. Pregnancy is viewed as a sequence of processes – fertilization, blastocyst formation, implantation, gastrulation, placentation, organogenesis, gross morphogenesis, birth and neonatal ...
Arun V. Holden
wiley   +1 more source