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We present the VIMOS Spectroscopic Survey of a Supercluster in the COSMOS field (VIS3COS) at z~0.84. We use VIMOS high-resolution spectra (GG475 filter) to spectroscopically select 490 galaxies in and around the super-structure and an…

With the aim of understanding the effect of the environment on the star formation history and morphological transformation of galaxies, we present a detailed analysis of the colour, morphology and internal structure of cluster and field…

Can N-body simulations reliably determine the structural properties of dark matter halos? Focussing on a Virgo-sized galaxy cluster, we increase the resolution of current ``high resolution simulations'' by almost an order of magnitude to…

天体物理学 · 物理学 2008-11-26 Sebastiano Ghigna , Ben Moore , Fabio Governato , George Lake , Tom Quinn , Joachim Stadel

The HRS is a complete volume-limited sample of nearby objects including Virgo cluster and isolated objects. Using a recent compilation of HI and CO data we study the effects of the cluster on the molecular gas content of spiral galaxies. We…

星系天体物理 · 物理学 2015-06-18 A. Boselli , L. Cortese , M. Boquien , S. Boissier , B. Catinella , G. Gavazzi , C. Lagos , A. Saintonge

We study the present-day rotational velocity ($V_{rot}$) and velocity dispersion (${\sigma}$) profiles of the globular cluster (GC) systems in a sample of 50 lenticular (S0) galaxies from the E-MOSAICS galaxy formation simulations. We find…

Using a sample of BzK-selected galaxies at z~2 identified from the CFHT/WIRCAM near-infrared survey of GOODS-North, we discuss the relation between star formation rate (SFR), specific star formation rate (SSFR), and stellar mass (M_{*}),…

We present results of our 1.4 GHz image stacking analysis of mass-selected galaxies in the COSMOS field. From the resulting median radio continuum flux density we have determined the evolution of the average star formation rate (SFR) of…

宇宙学与河外天体物理 · 物理学 2011-02-09 Alexander Karim , Eva Schinnerer , the VLA-COSMOS , COSMOS collaborations

We measure the star formation efficiency (SFE), the star formation rate per unit gas, in 23 nearby galaxies and compare it to expectations from proposed star formation laws and thresholds. We use HI maps from THINGS and derive H2 maps from…

We study the population of backsplash galaxies at $z=0$ in the outskirts of massive, isolated clusters of galaxies taken from the MDPL2-SAG semi-analytic catalogue. We consider four types of backsplash galaxies according to whether they are…

Galaxies arrive on the red sequences of clusters at high redshift ($z>1$) once their star formation is quenched and evolve passively thereafter. However, we have previously found that cluster red sequence galaxies (CRSGs) undergo…

星系天体物理 · 物理学 2016-09-07 Roberto De Propris , Malcolm Bremer , Steve Phillipps

We constrain the mass distribution in nearby, star-forming galaxies with the Star Formation Reference Survey (SFRS), a galaxy sample constructed to be representative of all known combinations of star formation rate (SFR), dust temperature,…

Quiescent galaxies are predominantly observed in local galaxy clusters. However, the fraction of quiescent galaxies in high-redshift clusters significantly varies among different clusters. In this study, we present the results of an…

星系天体物理 · 物理学 2024-08-15 Seong-Kook Lee , Changbom Park , Juhan Kim , Jaehyun Lee , Brad K. Gibson , Yonghwi Kim , C. Gareth Few

Powerful jets and outflows are launched from the protostellar disks around newborn stars. These outflows carry enough mass and momentum to transform the structure of their parent molecular cloud and to potentially control star formation…

太阳与恒星天体物理 · 物理学 2014-07-30 Christoph Federrath , Martin Schrön , Robi Banerjee , Ralf S. Klessen

Semi-analytical models of galaxy formation can be used to predict the evolution of the number density of early-type galaxies as a function of the circular velocity at the virial radius, v_{c,vir}. Gravitational lensing probability and…

天体物理学 · 物理学 2009-11-11 Kyu-Hyun Chae , Shude Mao , Xi Kang

We present a sample of 1899 galaxies with a close companion taken from the SDSS DR7. The galaxy pairs are selected to have velocity differences < 300 km/s, projected separations (rp) < 80 kpc/h, mass ratios between 0.1 and 10, and robust…

宇宙学与河外天体物理 · 物理学 2015-06-05 Jillian M. Scudder , Sara L. Ellison , Paul Torrey , David R. Patton , J. Trevor Mendel

We investigate star formation at very early evolutionary phases in five massive clouds in the inner 500 pc of the Galaxy, the Central Molecular Zone. Using interferometer observations of H$_2$O masers and ultra-compact H II regions, we find…

We present the star formation rate (SFR) and starburst fraction (SBF) for a sample of field galaxies from the ICBS intermediate-redshift cluster survey. We use [O II] and Spitzer 24 micron fluxes to measure SFRs, and 24 micron fluxes and…

宇宙学与河外天体物理 · 物理学 2012-08-27 Alan Dressler , Augustus Oemler, , Michael G. Gladders , Lei Bai , Jane R. Rigby , Bianca M. Poggianti

Estimates of the integrated (SFR) and specific (sSFR) rates of star formation are given for 181 galaxies of later Sc, Scd, and Sd types seen almost face-on. Their SFRs were determined from FUV fluxes in the GALEX survey. The median values…

星系天体物理 · 物理学 2020-06-17 V. E. Karachentseva , I. D. Karachentsev , O. G. Kashibadze

We explore the possible effect of cluster environments on the structure and star formation histories of galaxies by analysing the projected phase-space (PPS) of intermediate-redshift cluster (0.4<z<0.8). HST I-band imaging data from the ESO…

We explore 7.5 billion years of evolution in the star formation activity of massive ($M_{\star}>10^{10.1}\,M_{\odot}$) cluster galaxies using a sample of 25 clusters over $0.15<z<1$ from the Cluster Lensing And Supernova survey with Hubble…

星系天体物理 · 物理学 2017-01-04 Cory R. Wagner , Stephane Courteau , Mark Brodwin , S. A. Stanford , Gregory F. Snyder , Daniel Stern