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According to the database from the first paper, we select 180 pairs with dV < 800 km/s and Dp < 60 kpc containing Markarian (MRK) galaxies. We study the dependence of galaxies integral parameters, star-formation (SF) and active galactic…

Cosmology and Nongalactic Astrophysics · Physics 2014-08-26 T. A. Nazaryan , A. R. Petrosian , A. A. Hakobyan , B. J. McLean , D. Kunth

[abridged] While observations of Local Group galaxies show a very simple, local star formation law in which the star formation rate per unit area in each patch of a galaxy scales linearly with the molecular gas surface density, recent…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-30 Mark R. Krumholz , Avishai Dekel , Christopher F. McKee

Galaxy mergers can change the rate at which stars are formed. We can trace when these changes occur in simulations of galaxy mergers. However, for observed galaxies we do not know how the star formation rate (SFR) evolves along the merger…

Astrophysics of Galaxies · Physics 2026-01-14 W. J. Pearson , L. Wang , V. Rodriguez-Gomez , B. Margalef-Bentabol , L. E. Suelves

We exploit the first public data release of VIPERS to investigate environmental effects in galaxy evolution between $z\sim0.5$ and $0.9$. The large number of spectroscopic redshifts over an area of about $10\,\mathrm{deg}^2$ provides a…

The process of galaxy evolution over cosmic time is not yet fully understood, since there is a debate on the impact of galaxy collisions on the star formation and metallicity. The local environment of the galaxy mergers could also have a…

Astrophysics of Galaxies · Physics 2025-09-12 Bendeguz Koncz , Istvan Horvath , András Péter Joó , Andreas Burkert , L. Viktor Tóth

The star formation rate density (SFRD) is an important tool in galaxy evolution that allows us to identify at which cosmic time galaxies are more efficient at forming stars. For low-mass star-forming galaxies, the SFRD as a function of…

Astrophysics of Galaxies · Physics 2025-04-07 G. G. Murrell , I. K. Baldry

Recent work has shown that the star formation-density relation -- in which galaxies with low star formation rates are preferentially found in dense environments -- is still in place at z~1, but the situation becomes less clear at higher…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-27 Ryan F. Quadri , Rik J. Williams , Marijn Franx , Hendrik Hildebrandt

Studies by Lada (2010) and Heiderman (2010) have suggested that star formation mostly occurs above a threshold in gas surface density Sigma of Sigma_c = 120 Msun pc^{-2} (A_K = 0.8). Heiderman infer a threshold by combining low-mass…

Astrophysics of Galaxies · Physics 2015-06-12 Andreas Burkert , Lee Hartmann

We investigate the two-halo galactic conformity effect for central galaxies, which is the spatial correlation of the star formation activities for central galaxies to several Mpcs, by studying the dependence of the star formation activities…

Astrophysics of Galaxies · Physics 2023-07-24 Kai Wang , Yingjie Peng , Yangyao Chen

We investigate the variation of current star formation in galaxies as a function of distance along three supercluster filaments, each joining pairs of rich clusters, in the Pisces-Cetus supercluster, which is part of the 2dFGRS. We find…

Astrophysics · Physics 2008-11-26 Scott C. Porter , Somak Raychaudhury

Galaxy-galaxy interactions are predicted to cause gas inflows leading to enhanced nuclear star formation. In this paper we test the further prediction that the gas inflows lead to enhanced accretion onto the central supermassive black hole,…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-30 Sara L. Ellison , David R. Patton , J. Trevor Mendel , Jillian M. Scudder

We investigate the enhancement of star formation efficiency in galaxy interactions and mergers, by numerical simulations of several hundred galaxy collisions. All morphological types along the Hubble sequence are considered in the initial…

Astrophysics · Physics 2009-11-13 P. Di Matteo , F. Combes , A. -L. Melchior , B. Semelin

Galaxy interaction and merging have clear effects on the systems involved. We find an increase in the star formation rate (SFR), potential ignition of active galactic nuclei (AGN) and significant morphology changes. However, at what stage…

The Star formation rate (SFR) is a crucial parameter to investigate galaxy evolution. At low redshift the cosmic SFR density declines smoothly, and massive active galaxies become passive, reducing their star formation activity. This implies…

We study the effects of galaxy environment on the evolution of the stellar-mass function (SMF) over 0.2 < z < 2.0 using the FourStar Galaxy Evolution (ZFOURGE) survey and NEWFIRM Medium-Band Survey (NMBS) down to the stellar-mass…

In order to assess whether the environment has a significant effect on galaxy sizes, we compare the mass--size relations of cluster and field galaxies in the $0.4 < z < 0.8$ redshift range from the ESO Distant Cluster Survey (EDisCS) using…

The environment is known to affect the formation and evolution of galaxies considerably best visible through the well-known morphology-density relationship. In this paper we study the effect of environment on the evolution of early-type…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-14 Daniel Thomas , Claudia Maraston , Kevin Schawinski , Marc Sarzi , Joseph Silk

We present measurements of the specific star-formation rate (SSFR)-stellar mass relation for star-forming galaxies. Our deep spectroscopic samples are based on the Redshift One LDSS3 Emission line Survey, ROLES, and European Southern…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-27 David G. Gilbank , Richard G. Bower , Karl Glazebrook , Michael L. Balogh , I. K. Baldry , G. T. Davies , G. K. T. Hau , I. H. Li , P. McCarthy , M. Sawicki

We measure the bivariate luminosity function (BLF) of galaxy pairs and use it to probe and characterize the galaxy-galaxy interaction between pair members. The galaxy pair sample is selected from the main galaxy sample of Sloan Digital Sky…

Astrophysics of Galaxies · Physics 2019-08-07 Shuai Feng , Shi-Yin Shen , Fang-Ting Yuan , A-Li Luo , Jian-Nan Zhang , Meng-Xin Wang , Xia Wang , Yin-Bi Li , Wen Hou , Yan-Xin Guo , Fang Zuo

To study the role of environment in galaxy evolution, we reconstruct the underlying density field of galaxies based on COSMOS2020 (The Farmer catalog) and provide the density catalog for a magnitude limited ($K_{s}<24.5$) sample of $\sim…