Results 51 to 60 of about 346,903 (248)

The cosmic assembly of stellar haloes in massive Early-Type Galaxies [PDF]

Monthly Notices of the Royal Astronomical Society, 2017
Using the exquisite depth of the Hubble Ultra Deep Field (HUDF12 programme) dataset, we explore the ongoing assembly of the outermost regions of the most massive galaxies ($\rm M_{\rm stellar}\geq$ 5$\times$10$^{10}$ M$_{\odot}$) at $z \leq$ 1. The outskirts of massive objects, particularly Early-Types Galaxies (ETGs), are expected to suffer a dramatic
Buitrago, Fernando, Trujillo, Ignacio, Curtis-Lake, Emma, Montes, Mireia, Cooper, Andrew P., Bruce, Victoria A., Pérez-González, Pablo G., Cirasuolo, Michele   +7 more
openaire   +5 more sources

Revealing the Galaxy–Halo Connection through Machine Learning

The Astrophysical Journal, 2023
Understanding the connections between galaxy stellar mass, star formation rate, and dark matter halo mass represents a key goal of the theory of galaxy formation. Cosmological simulations that include hydrodynamics, physical treatments of star formation,
Ryan Hausen, Brant E. Robertson, Hanjue Zhu, Nickolay Y. Gnedin, Piero Madau, Evan E. Schneider, Bruno Villasenor, Nicole E. Drakos   +7 more
doaj   +1 more source

Stellar haloes in Milky Way mass galaxies: from the inner to the outer haloes [PDF]

Monthly Notices of the Royal Astronomical Society, 2014
We present a comprehensive study of the chemical properties of the stellar haloes of Milky-Way mass galaxies, analysing the transition between the inner to the outer haloes. We find the transition radius between the relative dominance of the inner-halo and outer-halo stellar populations to be ~15-20 kpc for most of our haloes, similar to that inferred ...
P. B. Tissera, T. C. Beers, D. Carollo, C. Scannapieco   +3 more
openaire   +2 more sources

Near‐Infrared Imaging of H2O2 in Plants With Nanosensors Under Environmentally Changing Conditions

Advanced Materials, EarlyView.
This paper reports a ratiometric nanosensor enabling robust, multivariate detection of stress signals (H2O2) in plants, with high resistance to light fluctuations and mechanical disturbances. Single‐walled carbon nanotubes serve as the sensor, Egyptian Blue nanosheets serve as a stable reference, and plant autofluorescence serves as a label‐free ...
Jiaqi Li, Bjoern F. Hill, Chen Ma, Juliana Gretz, Tanuja Kistwal, Janus A. C. Wartmann, Justus T. Metternich, Juan Pablo Giraldo, Sebastian Kruss   +8 more
wiley   +1 more source

The accreted stellar halo as a window on halo assembly in L* galaxies [PDF]

Monthly Notices of the Royal Astronomical Society: Letters, 2017
Abstract Theory and observations agree that the accreted stellar haloes (ASHs) of Milky Way-like galaxies display significant scatter. I take advantage of this stochasticity to invert the link between halo assembly history (HAH) and ASH, using mock ASHs corresponding to 750 ΛCDM HAHs, sharing a final virial mass of Mh(z = 0) = 1012.25M⊙.
openaire   +3 more sources

The stellar halo of the edge-on galaxy NGC 891 [PDF]

Monthly Notices of the Royal Astronomical Society, 2007
Using the Advanced Camera for Surveys on board the Hubble Space Telescope, we have resolved individual red giant branch stars in the outskirts of the edge-on galaxy NGC 891, down to ∼2 mag fainter than the tip of the red giant branch. The data set allows investigation of the stellar populations in the outer regions of an analogue galaxy to the Milky ...
M. Mouhcine, M. Rejkuba, R. Ibata
openaire   +1 more source

Statistical Predictions of the Accreted Stellar Halos around Milky Way-Like Galaxies

The Open Journal of Astrophysics
In the $Λ$CDM paradigm, stellar halos form through the accretion and disruption of satellite galaxies. We introduce new semi-analytic modeling within the SatGen framework to track the ex-situ stellar components of Milky Way--like galaxies across large ...
J. Sebastian Monzon, Frank C. van den Bosch, Martin P. Rey   +2 more
doaj   +1 more source

Continuum Robots in Surgery: From Engineering Design to Clinical Practice

Advanced Robotics Research, EarlyView.
The hyper‐redundant nature of continuum robot structures enables near‐infinite degrees of freedom leading to immense potential for medical applications. This review provides a historical background of continuum robots and novel ideas shaping their progress to current structural design, sensing technology, modeling techniques, and control methods.
Griffin Smith, Kaitlyn Clancy, Siwen Xie, Xiaochen Li, Sarah Khalife, Benjamin van der Woerd, Onaizah Onaizah   +6 more
wiley   +1 more source

Evolution of the Galaxy - Dark Matter Connection and the Assembly of Galaxies in Dark Matter Halos [PDF]

, 2012
We present a new model to describe the galaxy-dark matter connection across cosmic time, which unlike the popular subhalo abundance-matching technique is self-consistent in that it takes account of the facts that (1) subhalos are accreted at different ...
Han, Jiaxin, van den Bosch, Frank C., Mo, H. J., Zhang, Youcai, Yang, Xiaohu, Bosch, Frank C. van den   +5 more
core   +1 more source

Dwarf Galaxies Also Have Stellar Halos [PDF]

The Astrophysical Journal, 1996
We present evidence for the existence of an old stellar halo in the dwarf irregular galaxy WLM, an isolated member of the Local Group. The halo consists of population-II stars, with low metallicities and age $\geq 10^{10}$yr. The finding of a halo in a dwarf irregular galaxy argues for a generic mode of galaxy formation that requires a halo in the ...
Minniti, Dante, Zijlstra, Albert
openaire   +2 more sources