Results 61 to 70 of about 509,719 (323)
Tracing primordial black holes in nonsingular bouncing cosmology
Physics Letters B, 2017 We in this paper investigate the formation and evolution of primordial black holes (PBHs) in nonsingular bouncing cosmologies. We discuss the formation of PBH in the contracting phase and calculate the PBH abundance as a function of the sound speed and ...
Jie-Wen Chen +3 more
doaj +1 more source
Frontiers in Astronomy and Space Sciences, 2022 Nearly all intragroup (IGL) and intracluster light (ICL) comes from stars that are not bound to any single galaxy but were formed in galaxies and later unbound from them.
Magda Arnaboldi, Ortwin Gerhard
doaj +1 more source
Counterrotation in Galaxies [PDF]
Symposium - International Astronomical Union, 1999 The phenomenon of counterrotation is observed when two galaxy components have their angular momenta projected antiparallel onto the sky. It follows that if the two components rotate around the same axis, the counter-rotation is intrinsic. On the contrary the counterrotation is only apparent if the rotation axes are misaligned and the line-of-sight lies
BERTOLA, FRANCESCO +1 more
openaire +5 more sources
Galaxy-galaxy-galaxy lensing: Third-order correlations between the galaxy and mass distributions in the Universe [PDF]
Schneider P., & Watts P., 2005, A&A 432, 3, 783, 2005 Galaxy-galaxy lensing (GGL) measures the 2-point cross-correlation between galaxies and mass in the Universe. In this work we seek to generalise this effect by considering the third-order correlations between galaxies and mass: galaxy-galaxy-galaxy lensing.
arxiv +1 more source
Al-Mustansiriyah Journal of Science, 2019 This work aims to use the color distribution of galaxies to differentiate between blue and red galaxies. The photometric data of 300000 galaxies at redshift of z = 0 – 0.15 were collected from the Sloan Digital Sky Survey (SDSS).
Hareth Saad Mahdi
doaj +1 more source
Galaxy Halo Masses from Galaxy‐Galaxy Lensing
The Astrophysical Journal, 2001 We present measurements of the extended dark halo profiles of bright early type galaxies at redshifts 0.1 to 0.9 obtained via galaxy-galaxy lensing analysis of images taken at the CFHT using the UH8K CCD mosaic camera. Six half degree fields were observed for a total of 2 hours each in I and V, resulting in catalogs containing ~20 000 galaxies per ...
Gerard A. Luppino +4 more
openaire +3 more sources
Quenched Galaxies in Clusters of Galaxies and Their Outskirts [PDF]
Astrophysical Bulletin, 2020 Based on the SDSS data, the properties of galaxies with quenched star formation (QGs) within the "splashback"-radius of galaxy clusters $R_{\rm sp}$ and beyond it have been studied.
F. G. Kopylova, Alexander I. Kopylov
openaire +3 more sources
Abundance diagnosis of E+A (post-starburst) galaxies [PDF]
Mon.Not.Roy.Astron.Soc.377:1222-1228,2007, 2007 E+A galaxies are characterized as a galaxy with strong Balmer absorption lines but without any [OII] or H$\alpha$ emission lines. The existence of strong Balmer absorption lines means that E+A galaxies have experienced a starburst within the last $<$1-1.5 gigayear.
arxiv +1 more source
THE AVERAGE STAR FORMATION HISTORIES OF GALAXIES IN DARK MATTER HALOS FROM z = 0–8 [PDF]
, 2012 We present a robust method to constrain average galaxy star formation rates (SFRs), star formation histories (SFHs), and the intracluster light (ICL) as a function of halo mass.
P. Behroozi, Risa Wechsler, C. Conroy
semanticscholar +1 more source
Analysis of the escape in systems with four exit channels
Mathematical Methods in the Applied Sciences, Volume 46, Issue 1, Page 1032-1044, 15 January 2023., 2023 In this paper, we have performed a numerical investigation of the escape of a particle from two different dynamical systems with the same number of exit channels. We have chosen specific values of the parameters of the systems so that the openings of the potential well in both systems are approximately of the same size.
Juan F. Navarro +2 more
wiley +1 more source