Investigating the merger origin of Early-Type Galaxies using ultra-deep optical images
P. -A. Duc, J. -C. Cuillandre, K. Alatalo, L. Blitz, M. Bois, F. Bournaud, M. Bureau, M. Cappellari, P. Cote, R. L. Davies, T. A. Davis, P. T. de Zeeuw, E. Emse… 展开作者
P. -A. Duc, J. -C. Cuillandre, K. Alatalo, L. Blitz, M. Bois, F. Bournaud, M. Bureau, M. Cappellari, P. Cote, R. L. Davies, T. A. Davis, P. T. de Zeeuw, E. Emsellem, L. Ferrarese, E. Ferriere, S. Gwyn, S. Khochfar, D. Krajnovic, H. Kuntschner, P. -Y. Lablanche, L. MacArthur, R. M. McDermid, L. Michel-Dansac, R. Morganti, T. Naab, T. Oosterloo, M. Sarzi, N. Scott, P. Serra, A. Weijmans, L. M. Young
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4 pages, 3 figures, proceedings of the IAU Symposium 277, tracing the ancestry of galaxies
The mass assembly of galaxies leaves various imprints on their surroundings, such as shells, streams and tidal tails. The frequency and properties of these fine structures depend on the mechanism driving the mass assembly: e.g. a monolithic collapse, rapid cold-gas accretion followed by violent disk instabilities, minor mergers or major dry / wet mergers. Therefore, by studying the outskirts of galaxies, one can learn about their main formation mechanism. I present here our on-going work to characterize the outskirts of Early-Type Galaxies (ETGs), which are powerful probes at low redshift of the hierarchical mass assembly of galaxies. This work relies on ultra-deep optical images obtained at CFHT with the wide-field of view MegaCam camera of field and cluster ETGs obtained as part of the Atlas-3D and NGVS projects. State of the art numerical simulations are used to interpret the data. The images reveal a wealth of unknown faint structures at levels as faint as 29 mag arcsec-2 in the g-band. Initial results for two galaxies are presented here.
Investigating the formation channel of GW231123: Population III stars or hierarchical mergers?
Sapienza, Università di Roma（罗马大学）；Tor Vergata, Università di Roma（罗马第二大学）；INAF/Osservatorio Astronomico di Roma（罗马天文台）；INFN, Sezione di Roma I（罗马第一国家核物理研究所）；Johns Hopkins University（约翰斯·霍普金斯大学）；Max-Planck-Institut für Astronomie（马克斯·普朗克天文学研究所）
Galactic Winds across the Gas-Rich Merger Sequence II. Lyman Alpha Emission and Highly Ionized O VI and N V Outflows in Ultraluminous Infrared Galaxies
Ultra-High-Energy Particle Production in Binary Mergers Endowed with Magnetic Fields
Universidade Federal do Paraná (UFPR)（巴拉那联邦大学）；Universidade Federal da Integração Latino-Americana（拉丁美洲一体化联邦大学）；Universidade Federal de São Carlos (UFSCar)（圣卡洛斯联邦大学）；Universidade Estadual de Londrina (UEL)（隆德里纳州立大学）；Universidade Tecnológica Federal do Paraná (UTFPR)（巴拉那联邦技术大学）；Federal University of Espírito Santo（圣埃斯皮里图联邦大学）
