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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…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-18 Sara L. Ellison , David R. Patton , Luc Simard , Alan W. McConnachie , Ivan K. Baldry , J. Trevor Mendel

We study galaxy pair samples selected from the Sloan Digital Sky Survey (SDSS-DR7) and we perform an analysis of minor and major mergers with the aim of investigating the dependence of galaxy properties on interactions. We build a galaxy…

Cosmology and Nongalactic Astrophysics · Physics 2015-06-03 Diego G. Lambas , Sol Alonso , Valeria Mesa , Ana Laura O'Mill

We present the distribution of a statistical sample of nearby galaxies in the k-space (k1 ~ log M, k2 ~ log Ie, k3 ~ log M/L). Our study is based on near-IR (H-band: lambda = 1.65 micron) observations, for the first time comprising early-…

Astrophysics · Physics 2009-11-07 D. Pierini , G. Gavazzi , P. Franzetti , M. Scodeggio , A. Boselli

Low-ionization Broad Absorption Line QSOs (LoBALs) are suspected to be merging systems in which extreme, AGN-driven outflows have been triggered. Whether or not LoBALs are uniquely associated with mergers, however, has yet to be…

Astrophysics of Galaxies · Physics 2023-06-07 Mariana S. Lazarova , Gabriela Canalizo , Mark Lacy , Wyatt Behn , Kaitlyn Raub , Vardha N. Bennert , Duncan Farrah

We explore the stellar mass density and colour profiles of 118 low redshift, massive, central galaxies, selected to have assembled 90 percent of their stellar mass 6 Gyr ago, finding evidence of the minor merger activity expected to be the…

Astrophysics of Galaxies · Physics 2023-01-10 Thomas M. Jackson , Anna Pasquali , Francesco La Barbera , Surhud More , Eva K. Grebel

Star-forming galaxies have been found to follow a relatively tight relation between stellar mass ($M_{*}$) and star formation rate (SFR), dubbed the `star formation sequence'. A turnover in the sequence has been observed, where galaxies…

We study integrated characteristics of ~14000 low-redshift (0<z<1) compact star-forming galaxies (SFGs) selected from the Data Release 12 of the Sloan Digital Sky Survey. It is found that emission of these galaxies is dominated by strong…

Astrophysics of Galaxies · Physics 2023-05-03 Y. I. Izotov , N. G. Guseva , K. J. Fricke , C. Henkel

Evolution of galaxies in dense environments can be affected by close encounters with neighbouring galaxies and interactions with the intracluster medium. Dwarf galaxies (dGs) are important as their low mass makes them more susceptible to…

According to the $\Lambda$ cold dark matter model of galaxy formation, the hierarchical assembly process is scale-free and interactions between galaxies in all mass ranges are expected. The effects of interactions between dwarf galaxies on…

Astrophysics of Galaxies · Physics 2023-12-27 Smitha Subramanian , Chayan Mondal , Venu Kalari

We use pair and environmental classifications of ~ 211,000 star-forming galaxies from the Sloan Digital Sky Survey, along with a suite of merger simulations, to investigate the enhancement of star formation as a function of separation in…

Cosmology and Nongalactic Astrophysics · Physics 2015-06-15 David R. Patton , Paul Torrey , Sara L. Ellison , J. Trevor Mendel , Jillian M. Scudder

We study in simple terms the role of feedback in establishing the scaling relations of low-surface-brightness and dwarf galaxies with stellar masses in the range 6x10^5 <M*< 3x10^10 Msun. These galaxies, as measured from SDSS and in the…

Astrophysics · Physics 2009-11-07 Avishai Dekel , Joanna Woo

We carried out a statistical analysis of galaxy pairs in hydrodynamical Lambda-CDM simulations. We focused on the triggering of star formation by interactions and analysed the enhancement of star formation activity in terms of orbital…

Astrophysics · Physics 2016-08-30 M. Josefa Perez , Patricia B. Tissera , Diego G. Lambas , Cecilia Scannapieco

Late-type low surface brightness galaxies (LSBs) are faint disk galaxies with central maximum stellar surface densities below 100 Msun/pc^2. The currently favored scenario for their origin is that LSBs have formed in fast-rotating halos…

Astrophysics of Galaxies · Physics 2013-06-05 Ji-hoon Kim , Jounghun Lee

We present the results of our analysis of the frequencies of galaxies with tidal tails and M51-type galaxies in several deep fields of the Hubble Space Telescope (HDF-N, HDF-S, HUDF, GOODS, GEMS). In total, we have found about seven hundred…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-30 V. P. Reshetnikov , Y. H. Mohamed

We explore galaxy properties and their link with environment and clustering using a population of ~1000 galaxies formed in a high resolution hydrodynamic simulation of the Lambda CDM cosmology. At the redshift we concentrate on, z=1, the…

Astrophysics · Physics 2015-05-13 Rupert A. C. Croft , Tiziana Di Matteo , Volker Springel , Lars Hernquist

(abridged) We studied a large sample of ~14000 dwarf star-forming galaxies with strong emission lines selected from the Sloan Digital Sky Survey (SDSS) and distributed in the redshift range of z~0-0.6. We modelled spectral energy…

Cosmology and Nongalactic Astrophysics · Physics 2023-05-03 Y. I. Izotov , N. G. Guseva , K. J. Fricke , C. Henkel

We measure the strength, frequency, and timescale of tidally triggered star formation at redshift z=0.08-0.38 in a spectroscopically complete sample of galaxy pairs drawn from the magnitude-limited redshift survey of 9,825 Smithsonian…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-18 Deborah Freedman Woods , Margaret J. Geller , Michael J. Kurtz , Eduard Westra , Daniel G. Fabricant , Ian Dell'Antonio

We have searched for compact stellar structures within 17 tidal tails in 13 different interacting galaxies using F606W- and F814W- band images from the Wide Field Planetary Camera 2 (WFPC2) on the Hubble Space Telescope (HST). The sample of…

We measure spectral features of ~3500 K-selected galaxies at 0.5<z<2.0 from high quality medium-band photometry using a new technique. First, we divide the galaxy sample in 32 subsamples based on the similarities between the full spectral…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-27 Mariska Kriek , Pieter G. van Dokkum , Katherine E. Whitaker , Ivo Labbe , Marijn Franx , Gabriel B. Brammer