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The galaxy size-luminosity and size-stellar mass relations are important constraints on the galactic baryon cycle of gas accretion, star formation, and feedback. There are conflicting claims in the literature regarding how environment…

星系天体物理 · 物理学 2026-01-14 Li-Wen Liao , Andrew Cooper

By means of galaxy evolutionary models, we explore the direct consequences of the LCDM cosmogony on the size evolution of galactic discs, avoiding intentionally the introduction of intermediate (uncertain) astrophysical processes. Based on…

宇宙学与河外天体物理 · 物理学 2015-05-13 C. Firmani , V. Avila-Reese

We examine the origins of the bimodality observed in the global properties of galaxies around a stellar mass of 3x10^10 M_sun by comparing the environmental dependencies of star-formation for the giant and dwarf galaxy populations. The…

天体物理学 · 物理学 2009-11-11 C. P. Haines , F. La Barbera , A. Mercurio , P. Merluzzi , G. Busarello

Galaxies with different morphological characteristics likely have different evolutionary histories, such that understanding the mechanisms that drive morphological change can provide valuable insights into the galaxy evolution process.…

星系天体物理 · 物理学 2025-08-15 L. J. M. Davies , J. Doan , S. Bellstedt , A. S. G. Robotham , S. Phillipps , C. Wolf , M. Meyer , M. Siudek , S. P. Driver

We examine the relation between galaxy properties and environment in the SDSS DR2, quantifying environment in terms of the mass of the host halo, which is obtained with a new iterative group finder. We find that galaxy type fractions scale…

天体物理学 · 物理学 2007-05-23 Simone M. Weinmann , Frank C. van den Bosch , Xiaohu Yang , H. J. Mo

Using multi-wavelength data, from UV-optical-near-mid IR, for $\sim$6000 galaxies in the local Universe, we study the dependence of star formation on the morphological T-types for massive galaxies ($\log M_*/M_\odot \geq 10$). We find that,…

星系天体物理 · 物理学 2017-08-16 Omkar Bait , Sudhanshu Barway , Yogesh Wadadekar

We study the environments of low- and high- excitation radio galaxies (LERGs and HERGs respectively) in the redshift range $0.01 < z < 0.4$, using a sample of 399 radio galaxies and environmental measurements from the Galaxy And Mass…

We explore the evolution of the stellar mass-size relation of galaxies of different morphological types and specifically bulge and disk components. We use a sample of $\sim35,000$ galaxies within a redshift range $0 < z < 1$, and stellar…

星系天体物理 · 物理学 2022-05-09 Abdolhosein Hashemizadeh

How do galaxy properties (such as stellar mass, luminosity, star formation rate, and morphology) and their evolution depend on the mass of their host dark matter halo? Using the Galaxy and Mass Assembly (GAMA) group catalogue, we address…

We explore properties of close galaxy pairs and merging systems selected from the SDSS-DR4 in different environments with the aim to assess the relative importance of the role of interactions over global environmental processes. For this…

宇宙学与河外天体物理 · 物理学 2015-05-13 Josefa Perez , Patricia Tissera , Nelson Padilla , M. Sol Alonso , Diego G. Lambas , .

We explore how the star formation and metal enrichment histories of present-day galaxies have been affected by environment combining stellar population parameter estimates and group environment characterization for SDSS DR7. We compare…

星系天体物理 · 物理学 2021-02-10 Anna R. Gallazzi , Anna Pasquali , Stefano Zibetti , Francesco La Barbera

We use a sample of close galaxy pairs selected from the Sloan Digital Sky Survey Data Release 4 (SDSS DR4) to investigate in what environments galaxy mergers occur and how the results of these mergers depend on differences in local galaxy…

宇宙学与河外天体物理 · 物理学 2015-05-18 Sara L. Ellison , David R. Patton , Luc Simard , Alan W. McConnachie , Ivan K. Baldry , J. Trevor Mendel

Using galaxies from the Sloan Digital Sky Survey Data Release 7 (SDSS DR7) along with haloes from the dark matter only constrained ELUCID (Exploring the Local Universe with the reConstructed Initial Density field) simulation, we examine the…

宇宙学与河外天体物理 · 物理学 2025-04-29 Youcai Zhang , Xiaohu Yang , Hong Guo , Peng Wang , Feng Shi

Aims. We aim to investigate if the environment (characterised by the host dark matter halo mass) plays any role in shaping the galaxy star formation main sequence (MS). Methods. The Galaxy and Mass Assembly project (GAMA) combines a…

We investigate the dependence of physical properties of galaxies brighter than M_r=-18.0 in the SDSS on environment, as measured by local density using an adaptive smoothing kernel. We find that variations of galaxy properties with…

天体物理学 · 物理学 2019-08-16 Changbom Park , Yun-Young Choi , Michael S. Vogeley , J. Richard Gott , Michael R. Blanton

The aim of this work is to study the effects of environment on the growth in size of galaxies. We examine the stellar mass-size relation for a sample of isolated galaxies interpreted as stellar systems where evolution has been mainly…

宇宙学与河外天体物理 · 物理学 2015-06-16 Mirian Fernández Lorenzo , Jack Sulentic , Lourdes Verdes-Montenegro , Maria del Carmen Argudo-Fernández

We predict the structure and dynamics of disc galaxies using galaxy evolution models within a hierarchical formation scenario The halo mass aggregation histories, for a Lambda CDM model, were generated and used to calculate the…

天体物理学 · 物理学 2008-11-26 C. Firmani , V. Avila-Reese

Recent work has identified a population of low-redshift E/S0 galaxies that lie on the blue sequence in color vs. stellar mass parameter space, where spiral galaxies typically reside. While high-mass blue-sequence E/S0s often resemble young…

宇宙学与河外天体物理 · 物理学 2014-11-20 L. H. Wei , S. J. Kannappan , S. N. Vogel , A. J. Baker

Massive Ultracompact Galaxies (MUGs) are common at z=2-3, but very rare in the nearby Universe. Simulations predict that the few surviving MUGs should reside in galaxy clusters, whose large relative velocities prevent them from merging,…

We study dust and associated molecular gas in 352 nearby early-type galaxies (ETGs) with prominent dust lanes. 65% of these `dusty ETGs' (D-ETGs) are morphologically disturbed, suggesting a merger origin. This is consistent with the D-ETGs…