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Galaxies are not randomly distributed across the universe but showing different kinds of alignment on different scales. On small scales satellite galaxies have a tendency to distribute along the major axis of the central galaxy, with…

宇宙学与河外天体物理 · 物理学 2014-10-17 X. Kang , W. P. Lin , Y. O. Wang , A. Dutton , A. Macciò

We present a determination of the two-dimensional shape parameters of the blue and red globular cluster systems (GCSs) in a large number of elliptical galaxies and lenticular galaxies (early-type galaxies, called ETGs). We use a homogeneous…

宇宙学与河外天体物理 · 物理学 2015-06-16 Hong Soo Park , Myung Gyoon Lee

ABRIDGED: We study the evolution since z~1 of the rest-frame B luminosity function of the early-type galaxies (ETGs) in ~0.7 deg^2 in the COSMOS field. In order to identify ALL progenitors of local ETGs we construct the sample of high-z…

The evolution of the structural and kinematic properties of early-type galaxies (ETGs), their scaling relations, as well as their stellar metallicity and age contain precious information on the assembly history of these systems. We present…

We present a stacking analysis of the complete sample of Early Type Galaxies (ETGs) in the \textit{Chandra} COSMOS (C-COSMOS) survey, to explore the nature of the X-ray luminosity in the redshift and stellar luminosity ranges \(0<z<1.5\)…

星系天体物理 · 物理学 2017-03-22 A. Paggi , G. Fabbiano , F. Civano , S. Pellegrini , M. Elvis , D. -W. Kim

[Abridged]We present the morphological analysis based on HST-NICMOS observations in the F160W filter of a sample of 32 early-type galaxies (ETGs) at 1<z<2 with spectroscopic confirmation of their redshift and spectral type. We find that…

天体物理学 · 物理学 2009-11-13 P. Saracco , M. Longhetti , S. Andreon

[abridged] The mass-size relation of early-type galaxies (ETGs) has been largely studied in the last years to probe the mass assembly of the most massive objects in the Universe. In this paper, we focus on the mass-size relation of…

The formation sequence of bulges and disks in late-type galaxies (LTGs) remains debated. While some theories suggest bulges form before disks, others propose the reverse. To address this, we analyze a bulge+disk decomposition catalog from…

星系天体物理 · 物理学 2025-07-16 Wenxiao Xue , Yu Rong

Observations suggest that red central galaxies align closely with their group galaxies and the large-scale environment.This finding was also replicated in simulations, which added information about the alignment of the stars that form the…

宇宙学与河外天体物理 · 物理学 2024-07-31 Facundo Rodriguez , Manuel Merchán , M. Celeste Artale

In this Letter, we analyse the radial UV-optical color distributions in a sample of low redshift green valley (GV) galaxies, with the Galaxy Evolution Explorer (GALEX)+Sloan Digital Sky Survey (SDSS) images, to investigate how the residual…

星系天体物理 · 物理学 2015-06-22 Zhizheng Pan , Jinrong Li , Weipeng Lin , Jing Wang , Xu Kong

The early--type galaxy (ETG) mass--size relation has been largely studied to understand how these galaxies have assembled their mass. One key observational result of the last years is that massive galaxies increased their size by a factor…

宇宙学与河外天体物理 · 物理学 2015-06-12 Marc Huertas-Company , Francesco Shankar , Simona Mei , Mariangela Bernardi , J. A. L. Aguerri , Alan Meert , Vinu Vikram

We have derived colour gradients for a sample of 20 early-type galaxies (ETGs) at 1 < z_spec < 2 selected from the GOODS-South field. The sample includes both normal ETGs (13) having effective radii comparable to the mean radius of local…

宇宙学与河外天体物理 · 物理学 2015-05-20 A. Gargiulo , P. Saracco , M. Longhetti

Galaxies evolve within the intricate geometry of the cosmic web, yet the distinct roles of its primary components - nodes and filaments remain incompletely understood. Using the EAGLE cosmological hydrodynamical simulation, we investigate…

星系天体物理 · 物理学 2026-02-25 Suman Sarkar , Biswajit Pandey , Apashanka Das

We exploit multi-wavelength photometry of early-type galaxies (ETGs) in the COSMOS survey to demonstrate that the low-level star formation activity in the ETG population at intermediate redshift is likely to be driven by minor mergers.…

宇宙学与河外天体物理 · 物理学 2015-05-14 Sugata Kaviraj , Kok-Meng Tan , Richard S. Ellis , Joseph Silk

[ABRIDGED] We aim to provide a holistic view on the typical size and kinematic evolution of massive early-type galaxies (ETGs), that encompasses their high-$z$ star-forming progenitors, their high-$z$ quiescent counterparts, and their…

星系天体物理 · 物理学 2018-05-18 A. Lapi , L. Pantoni , L. Zanisi , J. Shi , C. Mancuso , M. Massardi , F. Shankar , A. Bressan , L. Danese

In the first of a series of forthcoming publications, we present a panchromatic catalog of 102 visually-selected early-type galaxies (ETGs) from observations in the Early Release Science (ERS) program with the Wide Field Camera 3 (WFC3) on…

We present a study of the nature of the blue early-type galaxies (BEGs) in the GOODS north and south fields using the GOODS HST/ACS archival data. Using visual inspection, we have selected 58 BEGs and 113 normal red early-type galaxies…

天体物理学 · 物理学 2008-11-26 Joon Hyeop Lee , Myung Gyoon Lee , Ho Seong Hwang

Using a sample of galaxy groups selected from the Sloan Digital Sky Survey Data Release 7 (SDSS DR7), we examine the alignment between the orientation of galaxies and their surrounding large scale structure in the context of the cosmic web.…

宇宙学与河外天体物理 · 物理学 2013-12-05 Youcai Zhang , Xiaohu Yang , Huiyuan Wang , Lei Wang , H. J. Mo , Frank C. van den Bosch

Giant radio galaxies (GRGs) represent the largest individual astrophysical structures, rivalling galaxy clusters in physical extent. Understanding how they attain such scales demands examining their large scale cosmic surroundings,…

星系天体物理 · 物理学 2026-02-18 Mousumi Mahato , Elmo Tempel , Shishir Sankhyayan , Pratik Dabhade , Kshitij Chavan

Emission line galaxies (ELGs) are now the preeminent tracers of large-scale structure at z>0.8 due to their high density and strong emission lines, which enable accurate redshift measurements. However, relatively little is known about ELG…

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