Results 91 to 100 of about 180,283 (246)

Handedness asymmetry of spiral galaxies with z<0.3 shows cosmic parity violation and a dipole axis

, 2012
A dataset of 126,501 spiral galaxies taken from Sloan Digital Sky Survey was used to analyze the large-scale galaxy handedness in different regions of the local universe.
Lintott, Lintott, Lior Shamir, Longo, Morhac, Otsu, Shamir, Shamir, Shamir, York   +9 more
core   +1 more source

Physical properties of very powerful FRII radio galaxies [PDF]

Astronomy & Astrophysics, 2008
Astronomy and Astrophysics ...
O'Dea, Christopher P., Daly, Ruth A., Kharb, Preeti, Freeman, Kenneth A., Baum, Stefi A.   +4 more
openaire   +2 more sources

Repeating Nuclear Transients From Repeating Partial Tidal Disruption Events

Astronomische Nachrichten, EarlyView.
ABSTRACT Extragalactic nuclear transients that exhibit repeating outbursts can be modeled as the repeated dynamical interaction between bound stars and supermassive black holes (SMBHs). A subset of these transients, with recurrence timescales of months‐to‐years, have been explained as accretion flares from the repeated tidal stripping of a star by an ...
Ananya Bandopadhyay, Eric R. Coughlin, Julia Fancher, C. J. Nixon, Dheeraj R. Pasham   +4 more
wiley   +1 more source

Quantum WDM fermions and gravitation determine the observed galaxy structures

, 2013
Quantum mechanics is necessary to compute galaxy structures at kpc scales and below. This is so because near the galaxy center, at scales below 10 - 100 pc, warm dark matter (WDM) quantum effects are important: observations show that the interparticle ...
de Vega, H. J., Destri, C., Sanchez, N. G.   +2 more
core   +3 more sources

Quantifying the Impact of Relativistic Precession on Tidal Disruption Event Light Curves

Astronomische Nachrichten, EarlyView.
ABSTRACT The tidal field of a black hole can turn a star into a gas stream whose orbit can precess, especially if the a black hole is rapidly spinning. In this work, we investigate the impact of precession on the light curves of tidal disruption events (TDE).
Diego Calderón, Ondřej Pejcha, Brian D. Metzger, Paul C. Duffell, Stephan Rosswog   +4 more
wiley   +1 more source

Sensitivity and Insensitivity of Galaxy Cluster Surveys to New Physics

, 2008
We study the implications and limitations of galaxy cluster surveys for constraining models of particle physics and gravity beyond the Standard Model. Flux limited cluster counts probe the history of large scale structure formation in the universe, and ...
, , Abbott T (Dark Energy Survey Collaboration), Abramo L R Batista R C Liberato L Rosenfeld R, Binney J, Blanchard A Douspis M, Borgani S Rosati P Tozzi P Norman C, Brian Glover, Burenin R A Vikhlinin A Hornstrup A Ebeling H Quintana H Mescheryakov A, Clowe D Bradac M Gonzalez A H Markevitch M Randall S W Jones C Zaritsky D, de Blok W J G, Dodelson S, Efstathiou G, Francis M R, Haiman Z, Jain B Zhang P, Jones L R Scharf C Ebeling H Perlman E Wegner G Malkan M Horner D, Joshua Erlich, Liberato L, Lima M Hu W, McKay T Allen S, Mewe R, Mirizzi A Raffelt G G Serpico P D, Mushotzky R F, Navarro J F, Neal Weiner, Oukbir J Blanchard A, Padmanabhan T, Reichart D E, Reiprich T H, Ruhl J E (The SPT Collaboration), Thomas P   +31 more
core   +1 more source

THE PHYSICS OF GALAXY FORMATION

The New Cosmology, 2005
The epoch of galaxy formation, occurring between one and six billion years after the Big Bang, was initiated by the collapse of over-dense regions of matter, resulting in extraordinary bursts of star formation, rapid growth of massive nuclear black holes, and the rapid structural evolution of the early universe.
openaire   +1 more source

Feasibility Study for Application of Digitized Henize Mt. Wilson Michigan Southern Sky Hα$$ \boldsymbol{\alpha} $$ Survey Low‐Dispersive Spectral Plates for Searches for Anomalous and Highly Redshifted Objects

Astronomische Nachrichten, EarlyView.
ABSTRACT The goal of this study is to confirm the feasibility of the use of digitized low dispersive MtWilson Michigan Southern Sky Hα$$ \alpha $$ survey astronomical photographic plates for modern astrophysical research. The detection of highly redshifted objects, such as early galaxies and quasars, is fundamental to understanding the universe's ...
Tauseef Ahmad Zafar, René Hudec, Marta Mara Merono Vidagany, Fehmi Mejri   +3 more
wiley   +1 more source

Hidden No More: Spotlight on Tidal Disruption Events in Active Galactic Nuclei

Astronomische Nachrichten, EarlyView.
ABSTRACT Tidal disruption events (TDEs) are typically discovered in previously quiescent galaxies. However, earlier studies have revealed a handful of TDEs occurring in pre‐existing active galactic nuclei (AGN). We discuss AT2019aalc, a promising TDE candidate in an AGN, and compare it to similar sources.
Patrik Milán Veres
wiley   +1 more source

Merger-tree-based Galaxy Matching: A Comparative Study across Different Resolutions

The Astrophysical Journal
We introduce a novel halo/galaxy matching technique between two cosmological simulations with different resolutions, which utilizes the positions and masses of halos along their subhalo merger tree. With this tool, we conduct a study of resolution biases
Minyong Jung, Ji-hoon Kim, Boon Kiat Oh, Sungwook E. Hong, Jaehyun Lee, Juhan Kim   +5 more
doaj   +1 more source