scholarly journals The Ages of Elliptical Galaxies in a Merger Model

1996 ◽  
Vol 171 ◽  
pp. 265-273 ◽  
Author(s):  
G. Kauffmann
Keyword(s):  
Dark Matter ◽  
Star Formation ◽  
Early Phase ◽  
High Redshift ◽  
Elliptical Galaxies ◽  
Disk Galaxies ◽  
Dark Matter Halos ◽  
Formation History ◽  
History Of ◽  
Intense Star Formation

There have long been two competing views on the formation history of the ellipticals galaxies we see today. One is that most of the stars in present-day galactic bulges and ellipticals were produced during a relatively short, early phase of intense star formation at high redshift. The second view is that elliptical galaxies are relative latecomers, having been produced as the result of the merging of disk galaxies drawn together by gravity as their surrounding dark matter halos coalesced.

scholarly journals Dwarf Galaxies: From the Epoch of Peak Star Formation to the Epoch of Reionization

2018 ◽  
Vol 14 (S344) ◽  
pp. 429-436
Author(s):  
Hakim Atek
Keyword(s):  
Star Formation ◽  
Dwarf Galaxies ◽  
High Redshift ◽  
Great Part ◽  
Star Formation History ◽  
Dark Matter Halos ◽  
Galaxy Surveys ◽  
Formation History ◽  
History Of ◽  
Low Mass

AbstractDwarf galaxies represent the dominant population at high redshift and they most likely contributed in great part to star formation history of the Universe and cosmic reionization. The importance of dwarf galaxies at high redshift has been mostly recognized in the last decade due to large progress in observing facilities allowing deep galaxy surveys to identify low-mass galaxies. This population appear to have extreme emission lines and ionizing properties that challenge stellar population models. Star formation follows a stochastic process in these galaxies, which has important implication on the ionizing photon production and its escape fraction whose measurements are challenging for both simulations and observations. Outstanding questions include: what are the physical properties at the origin of such extreme properties? What are the smallest dark matter halos that host star formation? Are dwarf galaxies responsible for cosmic reionization?

scholarly journals Dissecting the Formation Histories of Galaxies with Stellar Populations Models

2009 ◽  
Vol 5 (S262) ◽  
pp. 153-163
Author(s):  
Ivo Labbé
Keyword(s):  
Star Formation ◽  
Current Knowledge ◽  
High Redshift ◽  
Local Environment ◽  
Stellar Populations ◽  
Current Data ◽  
Star Formation History ◽  
Spectral Energy ◽  
Formation History ◽  
History Of

AbstractHow did galaxies evolve from primordial fluctuations to the well-ordered but diverse population of disk and elliptical galaxies that we observe today? Stellar populations synthesis models have become a crucial tool in addressing this question by helping us to interpret the spectral energy distributions of present-day galaxies and their high redshift progenitors in terms of fundamental characteristics such as stellar mass and age. I will review our current knowledge on the evolution of stellar populations in early- and late type galaxies at z < 1 and the tantalizing – but incomplete – view of the stellar populations in galaxies at 1 < z < 3, during the global peak of star formation. Despite great progress, many fundamental questions remain: what processes trigger episodes of galaxy-scale star formation and what quenches them? To what degree does the star formation history of galaxies depend on the merger history, (halo) mass, or local environment? I will discuss some of the challenges posed in interpreting current data and what improved results might be expected from new observational facilities in the near- and more distant future.

scholarly journals The Galaxy UV Luminosity Function Before the Epoch of Reionization

2015 ◽  
Vol 11 (S319) ◽  
pp. 33-33 ◽  
Author(s):  
Charlotte A. Mason ◽  
Michele Trenti ◽  
Tommaso Treu
Keyword(s):  
Dark Matter ◽  
Star Formation ◽  
Degrees Of Freedom ◽  
Luminosity Function ◽  
High Redshift ◽  
Dark Matter Halos ◽  
Redshift Surveys ◽  
The Galaxy ◽  
Mass Dependent

AbstractWe present a model for the evolution of the galaxy ultraviolet (UV) luminosity function (LF) where star formation is linked to the assembly of dark matter halos under the assumption of a mass dependent, but redshift independent, efficiency. With a calibration at a single redshift, and no further degrees of freedom, our model captures the evolution of the UV LF over all available observations (0≲ z ≲ 10). We make predictions for reionization and future high-redshift surveys with JWST and WFIRST.

scholarly journals The star formation history of low-mass disk galaxies: A case study of NGC 300

2015 ◽  
Vol 585 ◽  
pp. A20 ◽  
Author(s):  
Xiaoyu Kang ◽  
Fenghui Zhang ◽  
Ruixiang Chang ◽  
Lang Wang ◽  
Liantao Cheng
Keyword(s):  
Star Formation ◽  
Star Formation History ◽  
Disk Galaxies ◽  
Formation History ◽  
History Of ◽  
Low Mass

scholarly journals Galaxy formation from dry and hydro simulations

2009 ◽  
Vol 5 (H15) ◽  
pp. 85-85
Author(s):  
Luca Ciotti
Keyword(s):  
Dark Matter ◽  
Galaxy Formation ◽  
Scaling Laws ◽  
High Redshift ◽  
Elliptical Galaxies ◽  
Dark Matter Halos ◽  
Galaxy Mergers ◽  
Lower Redshift

AbstractThe effects of dry and wet merging on the Scaling Laws (SLs) of elliptical galaxies (Es) are discussed. It is found that the SLs, possibly established at high redshift by the fast collapse of gas-rich and clumpy stellar distributions in preexisting dark matter halos following the cosmological SLs, are compatible with a (small) number of galaxy mergers at lower redshift.

scholarly journals THE STAR FORMATION HISTORY OF BCGs TOz= 1.8 FROM THE SpARCS/SWIRE SURVEY: EVIDENCE FOR SIGNIFICANT IN SITU STAR FORMATION AT HIGH REDSHIFT

2015 ◽  
Vol 814 (2) ◽  
pp. 96 ◽  
Author(s):  
Tracy M. A. Webb ◽  
Adam Muzzin ◽  
Allison Noble ◽  
Nina Bonaventura ◽  
James Geach ◽  
...  
Keyword(s):  
Star Formation ◽  
High Redshift ◽  
Star Formation History ◽  
Formation History ◽  
History Of

scholarly journals Recent star formation in high-redshift early-type galaxies: insights from the rest-frame UV

2007 ◽  
Vol 3 (S245) ◽  
pp. 195-200
Author(s):  
S. Kaviraj ◽  
S. K. Yi ◽  
E. Gawiser ◽  
P. G. van Dokkum ◽  
S. Khochfar ◽  
...  
Keyword(s):  
Star Formation ◽  
Rest Frame ◽  
Hubble Space Telescope ◽  
High Redshift ◽  
Star Formation History ◽  
Early Type ◽  
Formation History ◽  
History Of ◽  
Type Population ◽  
The Universe

AbstractWe combine deep UBV RIzJK photometry from the MUSYC survey with redshifts from the COMBO-17 survey to study the rest-frame ultraviolet (UV) properties of 674 high-redshift (0.5 < z < 1) early-type galaxies, drawn from the Extended Chandra Deep Field South (E-CDFS). Galaxy morphologies are determined through visual inspection of Hubble Space Telescope (HST) images taken from the GEMS survey. We harness the sensitivity of the UV to young (<1 Gyrs old) stars to quantify the recent star formation history of the early-type population. We find compelling evidence that early-types of all luminosities form stars over the lifetime of the Universe, although the bulk of their star formation is already complete at high redshift. Luminous (−23 < M(V) < −20.5) early-types form 10-15 percent of their mass after z = 1, while their less luminous (M(V) > −20.5) counterparts form 30-60 percent of their mass in the same redshift range.

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