Results 41 to 50 of about 228,395 (174)

Understanding the Results of Galaxy-Galaxy Lensing using Galaxy-Mass Correlation in Numerical Simulations [PDF]

Mon.Not.Roy.Astron.Soc. 339 (2003) 387, 2002
McKay et al. (2002) have recently used measurements of weak galaxy-galaxy lensing in the Sloan Digital Sky Survey to estimate the cross correlation between galaxies and the projected dark matter density field. They derive a relation between aperture mass within a radius of $260\kpch$, $M_{260}$, and lens galaxy luminosity, that does not depend on ...
arxiv   +1 more source

The Effect of Seductive Details on Knowledge Retention in Physics Videos: A Mixed Methods Study

Journal of Research in Science Teaching, EarlyView.
ABSTRACT Research reports that interesting but irrelevant information, seductive details, in teaching material can impede learning. In science education, the inclusion of historical narratives in lessons to promote interest has been recommended but may hinder learning.
Richard Brock, Liam Cini O'Dwyer, Ben Rogers   +2 more
wiley   +1 more source

Multi-wavelength Observations of Dusty Star Formation at Low and High Redshift

, 2000
This paper examines what can be learned about high-redshift star formation from the small fraction of high-redshift galaxies' luminosities that is emitted at accessible wavelengths.
Acosta-Pulido J. A., Aussel H., Blain A. W., Calzetti D., Charles C. Steidel, Hughes D. H., Kells W., Klaas U., Kurt L. Adelberger, Lawrence A., Madau P., Oakes D., Rifatto A., Rigopoulou D., Sanders D. B., Steidel C. C.   +15 more
core   +2 more sources

The near-infrared luminosity function of cluster galaxies beyond redshift one [PDF]

, 2006
We determined the K band luminosity function (LF) of cluster galaxies at redshift z~1.2, using near-infrared images of three X-ray luminous clusters at z=1.11,1.24,1.27.
Adami, Adami, Andreon, Andreon, Andreon, Andreon, Bahcall, Bahcall, Balogh, Balogh, Bardeen, Barger, Benítez, Bertin, Blakeslee, Blanton, Bruzual, C. Lidman, Carlberg, Carlberg, Cash, Cimatti, Cirimele, Cole, Coleman, Colless, Cowie, David, Davis, De Lucia, De Propris, De Propris, De Propris, Demarco, Dressler, Drory, Drory, Ellis, Ettori, Fontana, Franx, Franx, Garilli, Gavazzi, Gehrels, Giavalisco, Girardi, Girardi, Glazebrook, Hoekstra, Hoekstra, Holden, Holden, Holden, Hradecky, Huang, Jørgensen, Kajisawa, Kauffmann, Kauffmann, Kauffmann, Kinney, Kneib, Kodama, Kodama, Kodama, Labbé, Lidman, Lin, Lin, M. Nonino, Marinoni, Massarotti, McCarthy, Mullis, Mullis, Nagamine, Nakata, Nakata, P. E. Eisenhardt, P. Rosati, Postman, Pozzetti, R. Demarco, Reiprich, Rines, Rines, Rosati, Rosati, Rosati, S. A. Stanford, S. Ettori, S. Toft, Sanderson, Saracco, Schaeffer, Schechter, Stanford, Stanford, Stanford, Stanford, Thomas, Toft, Toft, Tran, Trentham, Trentham, Tully, V. Mainieri, V. Strazzullo, van der Wel, van Dokkum, van Dokkum, van Dokkum, van Dokkum, van Dokkum, Williams   +116 more
core   +1 more source

Simulating High-redshift Galaxies: Enhancing UV Luminosity with Star Formation Efficiency and a Top-heavy IMF

The Astrophysical Journal
Recent findings from photometric and spectroscopic JWST surveys have identified examples of high-redshift galaxies at z  ≳ 10. These high- z galaxies appear to form much earlier and exhibit greater UV luminosity than predicted by theoretical work.
Tae Bong Jeong, Myoungwon Jeon, Hyunmi Song, Volker Bromm   +3 more
doaj   +1 more source

An Empirical Consistent Redshift Bias: A Possible Direct Observation of Zwicky’s TL Theory

Particles
Recent advancements have shown tensions between observations and our current understanding of the Universe. Such observations may include the H0 tension and massive galaxies at high redshift that are older than traditional galaxy formation models have ...
Lior Shamir
doaj   +1 more source

Strong [O iii] λ5007 Compact Galaxies Identified from SDSS DR16 and Their Scaling Relations

The Astronomical Journal, 2023
Green-pea galaxies are a special class of star-forming compact galaxies with strong [O iii ] λ 5007 and considered as analogs of high-redshift Ly α -emitting galaxies and potential sources for cosmic reionization.
Weiyu Ding, Hu Zou, Xu Kong, Yulong Gao, Fujia Li, Hongxin Zhang, Jiali Wang, Jie Song, Jipeng Sui, Jundan Nie, Suijian Xue, Weijian Guo, Yao Yao, Zhimin Zhou   +13 more
doaj   +1 more source

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

swPHoToNs: Toward trillion‐body‐scale cosmological N‐body simulations on Sunway TaihuLight supercomputer

Engineering Reports, Volume 7, Issue 3, March 2025.
We present the details of implementing a highly efficient and scalable Cosmological N‐body simulation framework on the heterogeneous many‐core supercomputer Sunway TaihuLight. We manage to conduct cosmological simulations which contain up to 1.6 trillion particles, obtaining a sustained performance of 56.3 PFlops with a weak‐scaling parallel efficiency
Zhao Liu, Qiao Wang, Xiaojing Lv, Xu Liu, Hongsong Meng, Guanghui Zhu, Liang Gao, Haohuan Fu, Guangwen Yang   +8 more
wiley   +1 more source

A Group of Red, Ly-alpha Emitting, High Redshift Galaxies

, 1997
We have discovered two new high redshift (z=2.38) galaxies, near the previously known z=2.38 galaxy 2139-4434 B1 (Francis et al. 1996). All three galaxies are strong Ly-alpha emitters, and have much redder continuum colors (I-K about 5) than other ...
Anthony C. Danks, Bithell M., Bruce E. Woodgate, Francis P. J., Paul J. Francis   +4 more
core   +1 more source