Galaxy Mass Assembly with VLT & HST and lessons for E-ELT/MOSAIC

Abstract

The fraction of distant disks and mergers is still debated, while 3D-spectroscopy is revolutionizing the field. However its limited spatial resolution imposes a complimentary HST imagery and a robust analysis procedure. When applied to observations of IMAGES galaxies at z=0.4-0.8, it reveals that half of the spiral progenitors were in a merger phase, 6 billion year ago. The excellent correspondence between methodologically-based classifications of morphologies and kinematics definitively probes a violent origin of disk galaxies as proposed by Hammer et al. (2005). Examination of nearby galaxy outskirts reveals fossil imprints of such ancient merger events, under the form of well organized stellar streams. Perhaps our neighbor, M31, is the best illustration of an ancient merger, which modeling in 2010 leads to predict the gigantic plane of satellites discovered by Ibata et al. (2013). There are still a lot of discoveries to be done until the ELT era, which will open an avenue for detailed and accurate 3D-spectroscopy of galaxies from the earliest epochs to the present.

Invited Review at the IAU Symposium No. 309, 2014 "Galaxies in 3D across the Universe", B. L. Ziegler, F. Combes, H. Dannerbauer, M. Verdugo, Eds; 8 pages, 3 Figures

References in corpus (17)

• Star Formation in AEGIS Field Galaxies since z=1.1 : The Dominance of Gradually Declining Star Formation, and the Main Sequence of Star-Forming Galaxies
• A Vast Thin Plane of Co-rotating Dwarf Galaxies Orbiting the Andromeda Galaxy
• A fitting formula for the merger timescale of galaxies in hierarchical clustering
• Kinemetry of SINS High-Redshift Star-Forming Galaxies: Distinguishing Rotating Disks from Major Mergers
• The ghost of a dwarf galaxy: fossils of the hierarchical formation of the nearby spiral galaxy NGC 5907
• Evolution of the Luminosity Function, Star Formation Rate, Morphology and Size of Star-forming Galaxies Selected at Rest-frame 1500A and 2800A
• IMAGES-III: The evolution of the Near-Infrared Tully-Fisher relation over the last 6 Gyr
• Cold Molecular Gas in Merger Remnants: I. Formation of Molecular Gas Disks
• The Radical Consequences of Realistic Satellite Orbits for the Heating and Implied Merger Histories of Galactic Disks
• IMAGES I. Strong evolution of galaxy kinematics since z=1
• Reproducing properties of MW dSphs as descendants of DM-free TDGs
• The Extended Star Formation History of the Andromeda Spheroid at Twenty One Kiloparsecs on the Minor Axis
• The angular momentum of baryons and dark matter halos revisited
• A giant bar induced by a merger event at z=0.4?
• Loops formed by tidal tails as fossil records of a major merger
• A decrease of the gas exchanges between galaxies and the IGM, from 12 to 6 billion years ago
• The main sequence of star-forming galaxies at z~0.6: reinstating major mergers