The DOI matches its Crossref record; 3 of the 3 references it cites were found in a registry or an index.
MINOR MERGERS AND THE SIZE EVOLUTION OF ELLIPTICAL GALAXIES
Open accessAbstract
Using a high-resolution hydrodynamical cosmological simulation of the formation of a massive spheroidal galaxy we show that elliptical galaxies can be very compact and massive at high redshift in agreement with recent observations. Accretion of stripped infalling stellar material increases the size of the system with time and the central concentration is reduced by dynamical friction of the surviving stellar cores. In a specific case of a spheroidal galaxy with a final stellar mass of 1.5 × 10 11 M ☉ we find that the effective radius r e increases from 0.7 ± 0.2 kpc at z = 3 to r e = 2.4 ± 0.4 kpc at z = 0 with a concomitant decrease in the effective density of an order of magnitude and a decrease of the central velocity dispersion by approximately 20% over this time interval. A simple argument based on the virial theorem shows that during the accretion of weakly bound material (minor mergers) the radius can increase as the square of the mass in contrast to the usual linear rate of increase for major mergers. By undergoing minor mergers compact high-redshift spheroids can evolve into present-day systems with sizes and concentrations similar to observed local ellipticals. This indicates that minor mergers may be the main driver for the late evolution of sizes and densities of early-type galaxies.
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Cites
Spergel, D. N., Verde, L., Peiris, H. V., Komatsu, E., Nolta, M. R., Bennett, C. L., Halpern, M., Hinshaw, G., Jarosik, N., Kogut, A., et al. (2003) · The Astrophysical Journal Supplement Series · doi:10.1086/377226 · Cited by 10,976
The cosmological simulation code gadget-2
Springel, V. (2005) · Monthly Notices of the Royal Astronomical Society · doi:10.1111/j.1365-2966.2005.09655.x · Cited by 6,368
Galactic Dynamics: Second Edition
Binney, J., & Tremaine, S. (2008) · doi:10.1515/9781400828722 · Cited by 4,375 · cited 1×
“According to the virial theorem (Binney & Tremaine 2008) the total energy of the system is Ei = Ki + Wi = −Ki = 1 2 Wi = − 1 2 Mi〈v 2 i 〉 = − 1 2 GM2i rg,i .”
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Cited by
Galactic star formation and accretion histories from matching galaxies to dark matter haloes
Moster, B. P., Naab, T., & White, S. D. M. (2013) · Monthly Notices of the Royal Astronomical Society · doi:10.1093/mnras/sts261 · Cited by 1,431
Self-citationTheoretical Challenges in Galaxy Formation
Naab, T., & Ostriker, J. P. (2017) · Annual Review of Astronomy and Astrophysics · doi:10.1146/annurev-astro-081913-040019 · Cited by 722
Self-citationRodriguez-Gomez, V., Pillepich, A., Sales, L. V., Genel, S., Vogelsberger, M., Zhu, Q., Wellons, S., Nelson, D., Torrey, P., Springel, V., et al. (2016) · Monthly Notices of the Royal Astronomical Society · doi:10.1093/mnras/stw456 · Cited by 478
MORPHOLOGIES OF ∼190,000 GALAXIES AT z = 0–10 REVEALED WITH HST LEGACY DATA. I. SIZE EVOLUTION
Shibuya, T., Ouchi, M., & Harikane, Y. (2015) · The Astrophysical Journal Supplement Series · doi:10.1088/0067-0049/219/2/15 · Cited by 426
MODELING THE METALLICITY DISTRIBUTION OF GLOBULAR CLUSTERS
Muratov, A. L., & Gnedin, O. Y. (2010) · The Astrophysical Journal · doi:10.1088/0004-637x/718/2/1266 · Cited by 337
Metadata
- Authors
- Naab, T., Johansson, P. H., & Ostriker, J. P.
- Venue
- The Astrophysical Journal
- Publisher
- American Astronomical Society
- Published
- 2009-06-25
- Volume
- 699
- Issue
- 2
- Pages
- L178-L182
- ISSN
- 0004-637X (ISSN-L)
- 1538-4357
- OpenAlex
- W2025020969
- Cited by
- 979
- References
- 3
- FWCI
- 34.44
- Type
- journal article
- Language
- en
- Open access
- bronze
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- Naab, T., Johansson, P. H., & Ostriker, J. P. (2009). MINOR MERGERS AND THE SIZE EVOLUTION OF ELLIPTICAL GALAXIES. The Astrophysical Journal. https://doi.org/10.1088/0004-637x/699/2/l178
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Bibliographic data: Semantic Scholar, OpenAlex, Crossref.
Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).
Semantic Scholar’s data is described in: Kinney, R., et al. (2023). The Semantic Scholar Open Data Platform. arXiv:2301.10140.
