We analyze a comprehensive set of mergers and acquisitions from SDC data from 1992 through 2009. We do not impose common restrictions such as excluding private bidders, small targets, or deals without a deal value. We show a broader scope of mergers and acquisitions activity than that implied in the literature, which generally oversamples larger deals involving public firms. Further, some of ou...

The annihilation rate of weakly interacting cold dark matter particles at the galactic center could be greatly enhanced by the growth of a density spike around the central supermassive black hole (SBH). Here we discuss the effects of hierarchical mergers on the central spike. Mergers between halos containing SBHs lead to the formation of SBH binaries which transfer energy to the dark matter par...

Nonthermal radiation is observed from clusters of galaxies in the radio, hard X-rays, and possibly in the soft X-ray/UV bands. While it is known that radiative processes related to nonthermal electrons are responsible for this radiation, the sites and nature of particle acceleration are not known. We investigate here the acceleration of protons and electrons in the shocks originated during merg...

Recently Taniguchi and Ohyama found that the higher CO to CO integrated intensity ratios at a transition J=1–0, R = I(CO)/I(CO) ∼ > 20, in a sample of starburst merging galaxies such as Arp 220 are mainly attributed to the depression of CO emission with respect to CO. Investigating the same sample of galaxies analyzed by Taniguchi & Ohyama, we find that there is a tight, almost linear correlati...

Mergers of equals are often considered simply symbolic. Whereas existing literature on the topic views equality as underscoring the importance of distributive justice, power, or identity, the role of culture remains relatively obscure. In this study, the authors explore equality as a dynamic construct associated with two major processes in mergers of equals: cultural clash and cultural construc...

Horizontal mergers may be approved if antitrust authorities believe that new entry would limit any anticompetitive effects. This argument (‘the potential entry defense’) has led to mergers being approved in concentrated markets in several industries, including airlines. However, entry will be both less likely and less able to constrain market power if the pre-merger entry process has already se...

Mergers and acquisitions have been studied extensively, the reasons for them and how well they perform, but the studies have often focused on large public companies. The goal of this study was to find out if the reasons for mergers are the same for small companies in the software industry, as they are for large companies, and how well these mergers perform. To answer these questions I studied a...

Mergers are a common phenomenon in hierarchical structure formation, especially for massive galaxies and clusters, but their importance for dwarf galaxies in the Local Group remains poorly understood. We investigate the frequency of major mergers between dwarf galaxies in the Local Group using the ELVIS suite of cosmological zoom-in dissipationless simulations of Milky Wayand M31-like host halo...

We present binary galaxy merger simulations with varying mass ratios and different progenitor morphologies. The simulations include mergers of gas-rich disks (Sp-Sp), of early-type galaxies and disks (E-Sp, mixed mergers), and mergers of early-type galaxies (E-E, dry mergers). We follow the dynamics of gas, stars and dark matter, and include radiative cooling, star formation and black hole (BH)...