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We study the correlation between galaxy structure and the quenching of star formation using a sample of SDSS central galaxies with stellar masses 9.75< log M_*/M_sun<11.25 and redshifts z<0.075. GALEX UV data are used to cleanly divide the…

宇宙学与河外天体物理 · 物理学 2015-06-17 Jerome J. Fang , S. M. Faber , David C. Koo , Avishai Dekel

While the star formation rates and morphologies of galaxies have long been known to correlate with their local environment, the process by which these correlations are generated is not well understood. Galaxy groups are thought to play an…

The study of morphology in galaxies offers a convenient and quantitative method to measure the shapes and characteristics of galaxy light distribution that reflect the evolutionary history. For AGN-host dwarf galaxies, however, there is a…

星系天体物理 · 物理学 2025-06-09 Jie Tian , Yinghe Zhao , Xiejin Li , Jinming Bai

The evolution of number density, size and intrinsic colour is determined for a volume-limited sample of visually classified early-type galaxies selected from the HST/ACS images of the GOODS North and South fields (version 2). The sample…

宇宙学与河外天体物理 · 物理学 2015-05-13 Ignacio Ferreras , Thorsten Lisker , Anna Pasquali , Sadegh Khochfar , Sugata Kaviraj

We use SDSS+\textit{GALEX}+Galaxy Zoo data to study the quenching of star formation in low-redshift galaxies. We show that the green valley between the blue cloud of star-forming galaxies and the red sequence of quiescent galaxies in the…

We have examined in detail the morphologies of seven z~1.5 passively evolving luminous red galaxies using high resolution HST NICMOS and ACS imaging data. Almost all of these galaxies appear to be relaxed systems, with smooth morphologies…

天体物理学 · 物理学 2008-11-07 Elizabeth J. McGrath , Alan Stockton , Gabriela Canalizo , Masanori Iye , Toshinori Maihara

Building galaxy merger trees from a state-of-the-art cosmological hydrodynamics simulation, Horizon-AGN, we perform a statistical study of how mergers and smooth accretion drive galaxy morphologic properties above $z > 1$. More…

Galaxy mergers play a crucial role in shaping the morphology, the star formation, and the mass growth of galaxies across cosmic time. While mergers have been extensively investigated in the local Universe, the evolution of their frequency…

Active galactic nuclei (AGN), particularly the most luminous AGN, are commonly assumed to be triggered through major mergers, however observational evidence for this scenario is mixed. To investigate any influence of galaxy mergers on AGN…

星系天体物理 · 物理学 2017-07-05 Tim Hewlett , Carolin Villforth , Vivienne Wild , Jairo Mendez-Abreu , Milena Pawlik , Kate Rowlands

The mass aggregation and merger histories of present-day distinct haloes selected from the cosmological Millennium Simulations I and II are mapped into stellar mass aggregation and galaxy merger histories of central galaxies by using…

宇宙学与河外天体物理 · 物理学 2015-06-17 Vladimir Avila-Reese , Jesus Zavala , Ivan Lacerna

Using deep infrared observations conducted with the MOIRCS on the Subaru Telescope in GOODS-N combined with public surveys in GOODS-S, we investigate the dependence on stellar mass, M_*, and galaxy type of the close pair fraction (5 kpc < r…

宇宙学与河外天体物理 · 物理学 2010-01-15 Kevin Bundy , Masataka Fukugita , Richard S. Ellis , Thomas A. Targett , Sirio Belli , Tadayuki Kodama

[abridged] New near-infrared surveys, using the HST, offer an unprecedented opportunity to study rest-frame optical galaxy morphologies at z>1 and to calibrate automated morphological parameters that will play a key role in classifying…

Galaxy mergers are believed to play a key role in transforming star-forming disk galaxies into quenched ellipticals. Most of our theoretical knowledge about such morphological transformations does, however, rely on idealised simulations…

星系天体物理 · 物理学 2017-07-20 Martin Sparre , Volker Springel

We present a model for the broad morphological distinction between the disk and spheroidal components of galaxies. Elaborating on the hierarchical clustering scheme of galaxy formation proposed by Cole et al., we assume that galaxies form…

天体物理学 · 物理学 2015-06-24 C. M. Baugh , S. Cole , C. S. Frenk

The evolution of our Universe is strongly influenced by the attractive force of gravity. A key aspect of this evolution, therefore, is the merging of galaxies. Here, we explore the role of mergers in shaping the properties of massive…

星系天体物理 · 物理学 2025-06-12 Sugata Kaviraj

We review recent evidence for a clear association between accretion onto supermassive black holes and star formation up to z~1 in the zCOSMOS survey. Star formation rates (SFRs) are determined from the [OII] emission-line strength and a…

宇宙学与河外天体物理 · 物理学 2015-05-14 John D. Silverman , zCOSMOS Collaboration , XMMCOSMOS Collaboration

We analyze the morphological properties of a large sample of 1503 70 micron selected galaxies in the COSMOS field spanning the redshift range 0.01<z< 3.5 with a median redshift of 0.5 and an infrared luminosity range of 10^8<L_IR<10^14L_sun…

Galaxies infalling into clusters undergo both star-formation quenching and morphological transformation due to environmental effects. We investigate these processes and their timescales using a local sample of 20,191 cluster and 11,674…

The evolution of low-mass galaxies is shaped by both internal processes and environmental factors, yet the role of environment and mergers in regulating their growth and star formation rates remains poorly understood, especially in the…

星系天体物理 · 物理学 2025-06-10 Mohammad Reza Shojaei , Saeed Tavasoli , Parsa Ghafour

Following the study of Darg et al. (2009; hereafter D09a) we explore the environments, optical colours, stellar masses, star formation and AGN activity in a sample of 3003 pairs of merging galaxies drawn from the SDSS using visual…