Results 81 to 90 of about 194,444 (226)

Elliptical galaxies: fundamental relations, environmental effects and peculiar motions [PDF]

, 1993
This thesis investigates the reliability of the D - σ and D - Mg(_2) distance indicators for elliptical galaxies. In particular, we test whether these empirical correlations are affected by differences in the stellar populations of elliptical galaxies ...
Llorente, R.G, Llorente, Rafael Guzmán
core  

Can We Discover Physical Models Using Machine Learning? A Case Study of Galaxy Sizes

The Astrophysical Journal
We explore the ability of machine learning methods to discover underlying equations of physics by searching for the equations governing galaxy size in a semianalytic model. This case study allows us to evaluate the process as we know the ground truth. We
Festa Buçinca-Çupallari, Ariyeh H. Maller, Viviana Acquaviva, Austen Gabrielpillai, Rachel S. Somerville   +4 more
doaj   +1 more source

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

Astronomische Nachrichten, Volume 347, Issue 5, June 2026.
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

Radial Profiles of the Binary Fraction in Elliptical Galaxies

The Astrophysical Journal
The radial profile of the binary fraction may vary with environment and is of significant importance for studying the formation mechanisms of binary stars and their dynamical evolution within globular clusters and galaxies.
Xiejin Li, Fenghui Zhang, Yinghe Zhao, Cheng Li, Zhanwen Han, Yunkun Han, Xiaoyu Kang   +6 more
doaj   +1 more source

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

Astronomische Nachrichten, Volume 347, Issue 5, June 2026.
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

Cluster and field elliptical galaxies at [PDF]

, 2017
Aims. The aim of this work is twofold: first, to assess whether the population of elliptical galaxies in cluster at z ~ 1.3 differs from the population in the field and whether their intrinsic structure depends on the environment where they belong ...
P. Saracco, F. Ciocca, Ciocca, F., Marchesini, D., A. Gargiulo, D. Marchesini, SARACCO, Paolo, GARGIULO, ADRIANA   +7 more
core   +1 more source

Scheffrahnitermes ubuntu (Isoptera: Apicotermitinae), Description of a New Termite Using a Collaborative Approach to Address the Wallacean Shortfall

New Zealand Journal of Zoology, Volume 53, Issue 2, June 2026.
The study of Neotropical Apicotermitinae remains challenging due to the large number of undescribed taxa (Linnean shortfall) as well as the scarcity of distributional data (Wallacean shortfall). Despite recent efforts to reduce the first one, the second remains an even more significant challenge.
Camila C. Mellado, Giordano G. Messina, Antonio Carvalho, Danilo E. Oliveira, Rayssa Almeida‐Azevedo, Renato Almeida de Azevedo, Hélida F. Cunha, Emanuelly F. Lucena, Joice P. Constantini, Olga P. Pinzón‐Florián, Tiago F. Carrijo   +10 more
wiley   +1 more source

A unified linear intrinsic alignment model for elliptical and disc galaxies and the resulting ellipticity spectra

The Open Journal of Astrophysics
Alignments of disc galaxies were thought to result from tidal torquing, where tidal field of the cosmic large-scale structure exert torquing moments onto dark matter haloes, determining their angular momentum and ultimately the orientation of galactic ...
Basundhara Ghosh, Kai Nussbaumer, Eileen Sophie Giesel, Björn Malte Schäfer   +3 more
doaj   +1 more source

Black holes in red-sequence galaxies at z ∼ 0.7 − 2.5: Not a source of dark energy, but remnants of little red dots

Astronomy & Astrophysics
The nature of dark energy remains one of the most profound mysteries in modern cosmology. One intriguing proposal is that black holes (BHs) could be the astrophysical source of dark energy through a cosmological coupling mechanism, and strong evidence ...
Lei Lei, Wang Ze-Fan, Wang Yi-Ying, Feng Lei, Fan Yi-Zhong   +4 more
doaj   +1 more source

Surface Photometry of Spiral Galaxy NGC 5005 and Elliptical Galaxy NGC 4278

مجلة بغداد للعلوم, 2018
Two galaxies have been chosen, spiral galaxy NGC 5005 and elliptical galaxy NGC 4278 to study their photometric properties by using surface photometric techniques with griz-Filters. Observations are obtained from the Sloan Digital Sky Survey (SDSS).
Baghdad Science Journal
doaj   +1 more source