Merger Rate of Equal‐Mass Spherical Galaxies
نویسندگان
چکیده
منابع مشابه
Merger Rate of Equal-Mass Spherical Galaxies
We present cross sections and reaction rates for merging to occur during encounters of equal-mass spherical galaxies. As an application, we determine the rate of galaxy merging in clusters of galaxies. We present results for two types of Plummer models (a full and a truncated one), two King models and the Hernquist model. Cross sections are determined on the basis of a large number (∼ 500) of s...
متن کاملNIR Luminosity Function of Galaxies in Close Major-Merger Pairs and Mass Dependence of Merger Rate
A sample of close major-merger pairs (projected separation 5 ≤ r ≤ 20h kpc, Ks band magnitude difference δKs ≤ 1 mag) is selected from the matched 2MASS-2dFGRS catalog of Cole et al. (2001). The pair primaries are brighter than Ks = 12.5 mag. After corrections for various biases, the comparison between counts in the paired galaxy sample and counts in the parent sample shows that for the local ‘...
متن کاملThe Dissipative Merger Progenitors of Elliptical Galaxies
We address the deviations of the scaling relations of elliptical galaxies from the expectations based on the virial theorem and homology, including the “tilt” of the “fundamental plane” and the steep decline of density with mass. We show that such tilts result from dissipative major mergers once the gas fraction available for dissipation declines with progenitor mass, and derive the scaling pro...
متن کاملOn the star-formation rate - brightest cluster relation: estimating the peak SFR in post-merger galaxies
We further the recent discussion on the relation between the star-formation rate (SFR) of a galaxy and the luminosity of its brightest star-cluster (SFR vs. M V ). We first show that the observed trend between SFR vs. M V is due to the brightest cluster in a galaxy being preferentially young (6 15 Myr for a constant SFR) and hence a good tracer of the current SFR, although we give notable excep...
متن کاملEvolution of the Merger Fraction of Galaxies in CDM Cosmologies
We use semi-analytical modelling of galaxy formation to study the redshift evolution of the galaxy merger fractions and merger rates in ΛCDM and quintessence (QCDM) cosmologies, their dependence on physical parameters such as the environment, the merger timescale, the way major mergers are defined, and the minimum mass of objects taken into account. We find that for a given final halo mass the ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 1997
ISSN: 0004-637X,1538-4357
DOI: 10.1086/304013