Results 101 to 110 of about 497,560 (237)

Double trouble: Two spectroscopically confirmed low-mass quiescent galaxies at z > 5 in overdensities

Astronomy & Astrophysics
We present the discovery of two low-mass, high-redshift quiescent galaxies, GS-z5-Q1 and COS-z5-Q1, using JWST NIRSpec spectroscopy alongside NIRCam and MIRI photometry.
Baker William M., Ito Kei, Valentino Francesco, Zhu Pengpei, Scarpe Gianluca, Gottumukkala Rashmi, Hjorth Jens, Barrufet Laia, Langeroodi Danial   +8 more
doaj   +1 more source

Out There No One Has a Right to Die

Bioethics, EarlyView.
ABSTRACT The eventual goal of space exploration is to colonize exoplanets and their moons outside our solar system. This is a dangerous and immoral endeavour. The extraterrestrial life forms encountered would be hostile, vulnerable or both, and the descendants of the original pioneers would be involuntarily exposed to hazardous conditions and ...
Matti Häyry
wiley   +1 more source

A Glimpse of the Stellar Populations and Elemental Abundances of Gravitationally Lensed, Quiescent Galaxies at z ≳ 1 with Keck Deep Spectroscopy

The Astrophysical Journal, 2023
Gravitational lenses can magnify distant galaxies, allowing us to discover and characterize the stellar populations of intrinsically faint, quiescent galaxies that are otherwise extremely difficult to directly observe at high redshift from ground-based ...
Zhuyun Zhuang, Nicha Leethochawalit, Evan N. Kirby, J. W. Nightingale, Charles C. Steidel, Karl Glazebrook, Tania M. Barone, Hannah Skobe, Sarah M. Sweet, Themiya Nanayakkara, Rebecca J. Allen, Keerthi Vasan G. C., Tucker Jones, Glenn G. Kacprzak, Kim-Vy H. Tran, Colin Jacobs   +15 more
doaj   +1 more source

Which Came First: Supermassive Black Holes or Galaxies? Insights from JWST [PDF]

Astrophysical Journal Letters
Insights from JWST observations suggest that active galactic nuclei feedback evolved from a short-lived, high-redshift phase in which radiatively cooled turbulence and/or momentum-conserving outflows stimulated vigorous early star formation (“positive ...
Joseph Silk, M. Begelman, C. Norman, Adi Nusser, R. Wyse   +4 more
semanticscholar   +1 more source

Questions Should Have Answers

European Journal of Philosophy, EarlyView.
ABSTRACT Making sense of the world often requires one to come up with new ideas, including ideas one had previously been unable to think of. How and when should this be done? I propose and defend a norm of rationality linking wondering, belief, and abilities to conceive: one must not both wonder a question and reject all answers to it that one can ...
Michael Deigan
wiley   +1 more source

Galaxy Zoo: evidence for rapid, recent quenching within a population of AGN host galaxies [PDF]

Monthly Notices of the Royal Astronomical Society, 2016
We present a population study of the star formation history of 1244 Type 2 AGN host galaxies, compared to 6107 inactive galaxies. A Bayesian method is used to determine individual galaxy star formation histories, which are then collated to visualise the distribution for quenching and quenched galaxies within each population.
Smethurst, R. J., Lintott, C. J., Simmons, B. D., Schawinski, K., Bamford, S. P., Cardamone, C. N., Kruk, S. J., Masters, K. L., Urry, C. M., Willett, K. W., Wong, O. I.   +10 more
openaire   +6 more sources

Dwarf Galaxies in the TNG50 Field: connecting their Star-formation Rates with their Environments

The Open Journal of Astrophysics
The dwarf galaxies comparable to the LMC and SMC, with stellar masses $7.5
Joy Bhattacharyya, Annika H.G. Peter, Alexie Leauthaud   +2 more
doaj   +1 more source

A new population of recently quenched elliptical galaxies in the SDSS [PDF]

, 2013
We use the Sloan Digital Sky Survey to investigate the properties of massive elliptical galaxies in the local Universe (z\leq0.08) that have unusually blue optical colors.
D. H. Mcintosh, Cory R. Wagner, Andrew L. Cooper, E. Bell, D. Keres̆, F. V. D. Bosch, A. Gallazzi, T. Haines, Justin L. Mann, A. Pasquali, Allison M. Christian U. Missouri-Kansas City, U. Michigan, U. Diego, Yale University, Inaf - Arcetri, U. Heidelberg, M. I. O. Technology   +16 more
semanticscholar   +1 more source

Innovation Diffusion Among Case‐Based Decision‐Makers

Journal of Economics &Management Strategy, EarlyView.
ABSTRACT This paper analyzes a model of innovation diffusion with case‐based individuals a la Gilboa and Schmeidler, who decide whether to consume an incumbent or a new product based on their and their social neighbors' previous consumption experiences. I analyze how diffusion patterns change with individual characteristics, innovation characteristics,
Benson Tsz Kin Leung
wiley   +1 more source

On the Origin of Quenched but Gas-rich Regions at Kiloparsec Scales in Nearby Galaxies

The Astrophysical Journal
We use resolved spectroscopy from MaNGA to investigate the significance of both local and global properties of galaxies to the cessation of star formation at kpc scales.
Tao Jing, Cheng Li
doaj   +1 more source