Results 41 to 50 of about 737 (162)

Clustering and redshift-space distortions in QSO and galaxy surveys [PDF]

, 2006
In this thesis, we exploit the potential of existing QSO and galaxy surveys for investigating the nature of the large scale structure in the Universe. A detailed analysis of clustering and redshift- space distortions allows us to constrain cosmological ...
Cruz da Angela, José Antonio, José Antonio Cruz da Angela   +1 more
core  

The MUSE Hubble Ultra Deep Field Survey: III. Testing photometric redshifts to 30th magnitude [PDF]

, 2017
International audienceWe tested the performance of photometric redshifts for galaxies in the Hubble Ultra Deep field down to 30th magnitude. We compared photometric redshift estimates from three spectral fitting codes from the literature (EAZY, BPZ and ...
Boogaard, L.A., Wisotzki, L., Contini, T., Richard, J., M. Maseda, R. Pello, A. Verhamme, J. Chevallard, Marino, R. A., Kollatschny, W., Maseda, M.V., Schaye, J., R. Bacon, H. Inami, L. Wisotzki, Pello, R., L. Boogaard, Bacon, R., J. Richard, W. Kollatschny, J. Brinchmann, Marino, R.A., R. A. Marino, Maseda, M., Charlot, S., Verhamme, A., Boogaard, L., Carollo, M., Inami, H., S. Charlot, Chevallard, J., Brinchmann, J., T. Contini, N. Bouché, J. Schaye, Bouché, N., M. Carollo   +36 more
core   +2 more sources

A New Padé Approach to Modeling Wormholes in Dekel‐Zhao Dark Matter Halos

Annalen der Physik, Volume 538, Issue 3, March 2026.
A matter‐first Padé strategy is introduced to build traversable wormholes from prescribed dark‐matter halos. Rational Padé fits approximately the Dekel–Zhao density and are analytically integrated to obtain a shape function that exactly reproduces the intended matter content, avoiding spurious poles of geometry‐first schemes.
Jonathan Alves Rebouças, Francisco Tiago Barboza Sampaio, Francisco Bento Lustosa, Leonardo Tavares de Oliveira, C. R. Muniz   +4 more
wiley   +1 more source

Estimation of redshifts from early galaxies [Elektronisk resurs] [PDF]

, 2007
Dating early galaxies is a current technical, empirical and theoretical problem. Progress has been made recently calculating these dates using the observed redshift, z, alone.
Paul, Jan,, Smith, M.L.,, Öztaş, A.M.,
core  

The peculiar motions of early-type galaxies in two distant regions - II. The spectroscopic data [PDF]

, 1999
We present the spectroscopic data for the galaxies studied in the EFAR project, which is designed to measure the properties and peculiar motions of early-type galaxies in two distant regions.
David Burstein, Colless, Matthew, Colless, M, McMahan Jr., Robert K., Davies, Roger L., Baggley, Glenn, Robert K. McMahan, Burstein, D, Saglia, RP, Burstein, David, McMahan, RK, Matthew Colless, Wegner, Gary, Davies, Roger, Saglia, R. P., Baggley, G, Gary Wegner, Glenn Baggley, Wegner, C, R. P. Saglia, Roger L. Davies   +20 more
core   +5 more sources

Logarithmic and Strong Coupling Models in Weyl‐Type f(Q,T)$f(Q,T)$ Gravity

Annalen der Physik, Volume 538, Issue 1, January 2026.
This work explores Weyl‐type f(Q,T) gravity using recent observational datasets — CC, Pantheon+, Union 3.0, and DESI DR2. Through MCMC analysis of logarithmic and strong coupling models, the study reveals a transition from deceleration to acceleration, quintessence‐to‐phantom dynamics, and late‐time consistency with LCDM, offering a geometry‐driven ...
Rahul Bhagat, S. K. Tripathy, B. Mishra
wiley   +1 more source

Adsorption of Helium on Cationic or Anionic Tetracene and Pentacene

Small Structures, Volume 7, Issue 1, January 2026.
How does the arrangement of helium atoms that are adsorbed on tetracene or pentacene ions change with increasing coverage? When does the adsorption layer change from 1D to 2D, and to 3D? Is the transition abrupt? Are the helium atoms localized? Is the arrangement the same for cations and anions? What changes as the acene grows in length?
Miriam Kappe, Florent Calvo, Rasif William, Bilal Rasul, Masoomeh Mahmoodi‐Darian, Paul Scheier, Olof Echt   +6 more
wiley   +1 more source

Low-resolution VLT spectroscopy of GRBs 991216, 011211 and 021211 [PDF]

, 2006
Gamma rays: bursts, galaxies:, abundances, galaxies: distances and redshifts, galaxies: quasars: absorption ...
Watson, D., PALAZZI, E, Fruchter, A. S., Rol, E., Wijers, R.A.M.J., Vreeswijk, P. M., C. Kouveliotou (7590188), L. Kaper, KOUVELIOTOU, C, P. T. O'Brien, N. Masetti (7612289), L. Piro (7620851), P. Jakobsson (7590599), VREESWIJK, P. M, Fruchter, S., L. Kaper (7603490), J. P. U, JAKOBSSON, D. Watson, F, HJORTH, PIAN, E, Fynbo, J.P.U., E. Palazzi (7603466), P. T. O'Brien (7604567), A. Smette, L, FYNBO, P, WATSON, Fruchter, A.S., J. Hjorth (2463328), D. Watson (6553337), Jakobsson, P., O'Brien, P.T., Ledoux, C., ROL, E, FRUCHTER, A. S, F. Frontera, C. Ledoux (7613075), Hjorth, J., Frontera, F., P. T, LEDOUX, A. S. Fruchter, P. M. Vreeswijk (7601714), J, PIRO, D, O'BRIEN, N. Masetti, C. Kouveliotou, A. S. Fruchter (7590185), Kouveliotou, C., R. A. M. J. Wijers (7590200), A. Smette (7620935), E. Pian, MASETTI, N, C., E. Rol, E. Pian (7612277), J. Gorosabel (7603436), P. M. Vreeswijk, WIJERS, R. A. M. J, J, GOROSABEL, L. Piro, FRONTERA, Filippo, E. Palazzi, J. Hjorth, J. P. U. Fynbo (7603457), SMETTE, A, Palazzi, E., J. P. U. Fynbo, Masetti, N., P. Jakobsson, Smette, A., Piro, L., C. Ledoux, R. A. M. J. Wijers, Kaper, L., Gorosabel, J., KAPER, L, F. Frontera (7581629), J. Gorosabel, Pian, E., Vreeswijk, P.M., E. Rol (7601738), Fynbo, J., O'Brian, P. T.   +81 more
core   +1 more source

Two Micron‐Size Dark Dimensions

Fortschritte der Physik, Volume 73, Issue 8, August 2025.
Abstract Two extra dimensions of micron scale might simultaneously address the gauge and cosmological hierarchy problems. In this paper various observational bounds in scenarios with one and two large extra dimensions are examined, to see if they are compatible with the micron scale.
Luis A. Anchordoqui, Ignatios Antoniadis, Dieter Lüst   +2 more
wiley   +1 more source

Fast Transients at Cosmological Distances with the SKA [PDF]

, 2015
Impulsive radio bursts that are detectable across cosmological distances constitute extremely powerful probes of the ionized Inter-Galactic Medium (IGM), intergalactic magnetic fields, and the properties of space-time itself.
Rene Breton, Trott, Laura Spitler, Deller, A, Grainge, K., Cathryn Trott, Lorimer, D., Deller, A., Eran Oded Ofek, Hessels, J, Chatterjee, S, Duncan Lorimer, Lorimer, D, Stappers, B; id_orcid, McQuinn, M., Ben Stappers, Fender, R., Ramesh Bhat, Shami Chatterjee, Pietka, M, Law, C, Spitler, L., Grainge, Keith, Casey Law, Bhat, Ramesh, Trott, C, Macquart, J P, McQuinn, M, Bhat, R., Jean -Pierre Macquart, Evan Keane, Fender, R, Ofek, E O, Law, C., Stappers, B., Macquart, Jean-Pierre, Breton, R., Ofek, E., Hessels, J., Macquart, J., Trott, Cathryn, Keane, E, Keane, E., Pietka, M., Chatterjee, S., Malgorzata Pietka, Matthew McQuinn, Bhat, R, Breton, Rene; id_orcid, Spitler, L, K. Grainge, Adam Deller, Rob Fender, Jason Hessels   +53 more
core   +5 more sources