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The AGORA High-resolution Galaxy Simulations Comparison Project IV: Halo and Galaxy Mass Assembly in a Cosmological Zoom-in Simulation at
Santi Roca-Fàbrega, Ji-hoon Kim, Joel R. Primack +25
In this fourth paper from the AGORA Collaboration, we study the evolution down to redshift and below of a set of cosmological zoom-in simulations of a Milky Way mass galaxy b…
Effects of feedback-free starburst galaxies on the 21-cm signal and reionization history
Sarah Libanore, Jordan Flitter, Ely D. Kovetz +2
Different star-formation models at Cosmic Dawn produce detectable signatures in the observables of upcoming 21-cm experiments. In this work, we consider the physical scenario of fe…
The Structure and Dynamics of Massive High- Cosmic-Web Filaments: Three Radial Zones in Filament Cross-Sections
Yue Samuel Lu, Nir Mandelker, S. Peng Oh +5
We analyse the internal structure and dynamics of cosmic-web filaments that connect massive high- haloes. Our analysis is based on a high-resolution AREPO cosmological simulatio…
Ly Blobs from Cold Streams Undergoing Kelvin-Helmholtz Instabilities
Nir Mandelker, Frank C. van den Bosch, Daisuke Nagai +3
We present an analytic toy model for the radiation produced by the interaction between the cold streams thought to feed massive halos at high redshift and their hot CGM. We begin b…
Reconstruction of the two-dimensional gravitational potential of galaxy clusters from X-ray and Sunyaev-Zel'dovich measurements
C. Tchernin, M. Bartelmann, K. Huber +8
The mass of galaxy clusters is not a direct observable, nonetheless it is commonly used to probe cosmological models. Based on the combination of all main cluster observables, that…
Distribution of streaming rates into high-redshift galaxies
Tobias Goerdt, Daniel Ceverino, Avishai Dekel +1
We study the accretion along streams from the cosmic web into high-redshift massive galaxies using three sets of AMR hydro-cosmological simulations. We find that the streams keep a…
An analytic solution for the minimal bathtub toy model: challenges in the star-formation history of high-z galaxies
Avishai Dekel, Nir Mandelker
We study the minimal ``bathtub" toy model as an analytic tool for capturing key processes of galaxy evolution and identifying robust successes and challenges in reproducing observa…
Observations of environmental quenching in groups in the 11 Gyr since z=2.5: different quenching for central and satellite galaxies
Tomer Tal, Avishai Dekel, Pascal Oesch +16
We present direct observational evidence for star formation quenching in galaxy groups in the redshift range 0<z<2.5. We utilize a large sample of nearly 6000 groups, selected by f…
Wet Disc Contraction to Galactic Blue Nuggets and Quenching to Red Nuggets
Avishai Dekel, Andreas Burkert
We study the origin of high-redshift, compact, quenched spheroids (red nuggets) through the dissipative shrinkage of gaseous discs into compact star-forming systems (blue nuggets).…
On the origin of the fundamental metallicity relation and the scatter in galaxy scaling relations
John C. Forbes, Mark R. Krumholz, Andreas Burkert +1
We present a simple toy model to understand what sets the scatter in star formation and metallicity of galaxies at fixed mass. The scatter ultimately arises from the intrinsic scat…
The Population of Giant Clumps in Simulated High-z Galaxies: In-situ and Ex-situ, Migration and Survival
Nir Mandelker, Avishai Dekel, Daniel Ceverino +3
We study the properties of giant clumps and their radial gradients in high- disc galaxies using AMR cosmological simulations. Our sample consists of 770 snapshots in the redshif…
A Rapidly Star-forming Galaxy 700 Million Years After the Big Bang at z=7.51
S. L. Finkelstein, C. Papovich, M. Dickinson +18
Out of several dozen z > 7 candidate galaxies observed spectroscopically, only five have been confirmed via Lyman-alpha emission, at z=7.008, 7.045, 7.109, 7.213 and 7.215. The sma…
The Progenitors of the Compact Early-Type Galaxies at High-Redshift
Christina C. Williams, Mauro Giavalisco, Paolo Cassata +19
We use GOODS and CANDELS images to identify progenitors of massive (log M > 10 Msun) compact "early-type" galaxies (ETGs) at z~1.6. Since merging and accretion increase the size of…
A Link Between Star Formation Quenching and Inner Stellar Mass Density in SDSS Central Galaxies
Jerome J. Fang, S. M. Faber, David C. Koo +1
We study the correlation between galaxy structure and the quenching of star formation using a sample of SDSS central galaxies with stellar masses 9.75< log M_*/M_sun<11.25 and reds…
Confronting Simulations of Optically Thick Gas in Massive Halos with Observations at z=2-3
Michele Fumagalli, Joseph F. Hennawi, J. Xavier Prochaska +4
Cosmological hydrodynamic simulations predict the physical state of baryons in the circumgalactic medium (CGM), which can be directly tested via quasar absorption line observations…
The long lives of giant clumps and the birth of outflows in gas-rich galaxies at high redshift
Frederic Bournaud, Valentin Perret, Florent Renaud +13
Star-forming disk galaxies at high redshift are often subject to violent disk instability, characterized by giant clumps whose fate is yet to be understood. The main question is wh…
Radiative feedback and the low efficiency of galaxy formation in low-mass haloes at high redshift
Daniel Ceverino, Anatoly Klypin, Elizabeth Klimek +4
Any successful model of galaxy formation needs to explain the low rate of star formation in the small progenitors of today's galaxies. This inefficiency is necessary for reproducin…
The Redshift and Mass Dependence on the Formation of The Hubble Sequence at z>1 from CANDELS/UDS
Alice Mortlock, Christopher J. Conselice, William G. Hartley +16
In this paper we present a detailed study of the structures and morphologies of a sample of 1188 massive galaxies with Mstar>10^10Msun between redshifts z=1-3 within the Ultra Deep…
Balance among gravitational instability, star formation, and accretion determines the structure and evolution of disk galaxies
John C. Forbes, Mark R. Krumholz, Andreas Burkert +1
Over the past 10 Gyr, star-forming galaxies have changed dramatically, from clumpy and gas rich, to rather quiescent stellar-dominated disks with specific star formation rates lowe…
CANDELS Observations of the Environmental Dependence of the Color-Mass-Morphology Relation at z = 1.6
Robert Bassett, Casey Papovich, Jennifer M. Lotz +16
We study the environmental dependence of color, stellar mass, and morphology by comparing galaxies in a forming cluster to those in the field at z = 1:6 with Hubble Space Telescope…
Structural Evolution of Early-type Galaxies to z=2.5 in CANDELS
Yu-Yen Chang, Arjen van der Wel, Hans-Walter Rix +18
Projected axis ratio measurements of 880 early-type galaxies at redshifts 1<z<2.5 selected from CANDELS are used to reconstruct and model their intrinsic shapes. The sample is sele…
Steady Outflows in Giant Clumps of High-z Disk Galaxies During Migration and Growth by Accretion
Avishai Dekel, Mark R. Krumholz
We predict the evolution of giant clumps undergoing star-driven outflows in high-z gravitationally unstable disk galaxies. We find that the mass loss is expected to occur through a…
Toy Models for Galaxy Formation versus Simulations
A. Dekel, A. Zolotov, D. Tweed +3
We describe simple useful toy models for key processes of galaxy formation in its most active phase, at z > 1, and test the approximate expressions against the typical behaviour in…
The Morphologies of Massive Galaxies at 1 < z < 3 in the CANDELS-UDS Field
V. A. Bruce, J. S. Dunlop, M. Cirasuolo +16
We have used high-resolution, HST WFC3/IR, near-infrared imaging to conduct a detailed bulge-disk decomposition of the morphologies of ~200 of the most massive (M_star > 10^11 M_so…