Orbital Structure of Collisionless Merger Remnants: On the Origin of Photometric and Kinematic Properties of Elliptical and S0 Galaxies

Abstract

We present a detailed investigation of the relation between the orbital content of merger remnants and observable properties of elliptical and S0 galaxies. Our analysis is based on the statistical sample of collisionless mergers of disk galaxies with different mass ratios and orbital parameters, published by Naab & Burkert. We use the spectral method by Carpintero & Aguilar to determine the orbital content of every remnant and correlate it with its intrinsic shape, and its projected kinematic and photometric properties. We discuss the influence of the bulge component and varying pericenter distances. The two most abundant orbit classes are the minor axis tubes and the box orbits. Their ratio seems to determine the basic properties of a remnant. On average, the fraction of minor axis tubes increases by a factor of two from a merger mass ratio of 1:1 to 4:1, whereas the fraction of box orbits decreases by 10%. At a given mass the central velocity dispersion of a remnant scales with the ratio of minor axis tubes to box orbits. Interestingly, the division line between rotational supported systems and pressure supported objects, $(v_{maj}/{\sigma }_0{)}^{\ast }=0.7$, turns out to coincide with a box to minor axis tube ratio of unity. The observed $h_3$-$v/\sigma$ anti-correlation for ellipticals can not be reproduced by collisionless merger remnants. We propose that this can only be reconciled by an additional physical process that significantly reduces the box orbit content. Remnants which are dominated by minor axis tube orbits have predominantly disky projections. Boxy remnants have always a box to minor axis tube ratio larger than one. This study will enable to identify observed ellipticals that could have formed, in the collisionless limit, by gas-poor disk mergers.

arXiv commentrevised version, accepted for publication in MNRAS; 18 pages, 18 figures partly in colour

References in corpus (13)

• Statistical Properties of Collisionless Equal- and Unequal-Mass Merger Remnants of Disk Galaxies
• Dynamical Modeling of Velocity Profiles: The Dark Halo Around the Elliptical Galaxy NGC2434
• On the Formation of Boxy and Disky Elliptical Galaxies
• The line of sight velocity distributions of simulated merger remnants
• Kinematics of Ten Early-Type Galaxies from HST and Ground-Based Spectroscopy
• GRAPE-5: A Special-Purpose Computer for N-body Simulation
• Global Properties of Multiple Merger Remnants
• The Formation of Disks in Elliptical Galaxies
• The Distribution of Stellar Orbits in the Giant Elliptical Galaxy NGC 2320
• The kinematics of 3:1-merger remnants and the formation of low-luminosity elliptical galaxies
• Line-of-sight velocity distributions of low-luminosity elliptical galaxies
• Long-Lived Triaxiality in the Dynamically Old Elliptical Galaxy NGC 4365: A Limit on Chaos and Black Hole Mass
• A Phase-Space Approach to Collisionless Stellar Systems Using a Particle Method

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