scholarly journals A NEAR-INFRARED EXCESS IN THE CONTINUUM OF HIGH-REDSHIFT GALAXIES: A TRACER OF STAR FORMATION AND CIRCUMSTELLAR DISKS?

2009 ◽  
Vol 706 (2) ◽  
pp. 1020-1035 ◽  
Author(s):  
Erin Mentuch ◽  
Roberto G. Abraham ◽  
Karl Glazebrook ◽  
Patrick J. McCarthy ◽  
Haojing Yan ◽  
...  
Keyword(s):  
Star Formation ◽  
Near Infrared ◽  
High Redshift ◽  
Circumstellar Disks ◽  
Infrared Excess ◽  
High Redshift Galaxies ◽  
The Continuum ◽  
Redshift Galaxies

scholarly journals Stacking of Interferometric Data

2012 ◽  
Vol 8 (S295) ◽  
pp. 94-94
Author(s):  
Lukas Lindroos ◽  
Kirsten K. Knudsen
Keyword(s):  
Star Formation ◽  
Near Infrared ◽  
High Redshift ◽  
Simulated Data ◽  
High Redshift Galaxies ◽  
Infrared Surveys ◽  
Statistical Detection ◽  
Redshift Galaxies

AbstractRadio and mm observations play an important role in determining the star formation properties of high redshift galaxies. However, most galaxies at high redshift are too faint to be detected individually at these wavelengths. A way to study this population of galaxies is to use stacking. By averaging the emission of a large number of galaxies detected in optical or near infrared surveys, we can achieve statistical detection.We investigate methods for stacking data from interferometric surveys. Interferometry poses unique challenges in stacking due to the nature of imaging of this data. We have compared directly stacking the uv data with stacking of the imaged data, the latter being the typically used approach. Using simulated data, we find that uv-stacking may provide around 50% less noise and that image based stacking systematically loses around 10% of the flux.

scholarly journals Self-consistent proto-globular cluster formation in cosmological simulations of high-redshift galaxies

2020 ◽  
Vol 493 (3) ◽  
pp. 4315-4332 ◽  
Author(s):  
Xiangcheng Ma ◽  
Michael Y Grudić ◽  
Eliot Quataert ◽  
Philip F Hopkins ◽  
Claude-André Faucher-Giguère ◽  
...  
Keyword(s):  
High Pressure ◽  
Star Formation ◽  
High Redshift ◽  
Cluster Formation ◽  
Mass Function ◽  
Cosmological Simulations ◽  
High Redshift Galaxies ◽  
Cluster Mass ◽  
Formation Efficiency ◽  
Redshift Galaxies

ABSTRACT We report the formation of bound star clusters in a sample of high-resolution cosmological zoom-in simulations of z ≥ 5 galaxies from the Feedback In Realistic Environments project. We find that bound clusters preferentially form in high-pressure clouds with gas surface densities over $10^4\, \mathrm{ M}_{\odot }\, {\rm pc}^{-2}$, where the cloud-scale star formation efficiency is near unity and young stars born in these regions are gravitationally bound at birth. These high-pressure clouds are compressed by feedback-driven winds and/or collisions of smaller clouds/gas streams in highly gas-rich, turbulent environments. The newly formed clusters follow a power-law mass function of dN/dM ∼ M−2. The cluster formation efficiency is similar across galaxies with stellar masses of ∼107–$10^{10}\, \mathrm{ M}_{\odot }$ at z ≥ 5. The age spread of cluster stars is typically a few Myr and increases with cluster mass. The metallicity dispersion of cluster members is ∼0.08 dex in $\rm [Z/H]$ and does not depend on cluster mass significantly. Our findings support the scenario that present-day old globular clusters (GCs) were formed during relatively normal star formation in high-redshift galaxies. Simulations with a stricter/looser star formation model form a factor of a few more/fewer bound clusters per stellar mass formed, while the shape of the mass function is unchanged. Simulations with a lower local star formation efficiency form more stars in bound clusters. The simulated clusters are larger than observed GCs due to finite resolution. Our simulations are among the first cosmological simulations that form bound clusters self-consistently in a wide range of high-redshift galaxies.

scholarly journals MEASURING STAR FORMATION RATES AND FAR-INFRARED COLORS OF HIGH-REDSHIFT GALAXIES USING THE CO(7–6) AND [N II] 205 μ m LINES

2015 ◽  
Vol 802 (1) ◽  
pp. L11 ◽  
Author(s):  
Nanyao Lu ◽  
Yinghe Zhao ◽  
C. Kevin Xu ◽  
Yu Gao ◽  
Tanio Díaz-Santos ◽  
...  
Keyword(s):  
Star Formation ◽  
High Redshift ◽  
Far Infrared ◽  
High Redshift Galaxies ◽  
Redshift Galaxies

scholarly journals LOW-METALLICITY STAR FORMATION IN HIGH-REDSHIFT GALAXIES ATz∼ 8

2010 ◽  
Vol 724 (2) ◽  
pp. 1480-1490 ◽  
Author(s):  
Y. Taniguchi ◽  
Y. Shioya ◽  
J. R. Trump
Keyword(s):  
Star Formation ◽  
High Redshift ◽  
High Redshift Galaxies ◽  
Low Metallicity ◽  
Redshift Galaxies

scholarly journals Hα Observations of a Large Sample of Galaxies atz∼ 2: Implications for Star Formation in High‐Redshift Galaxies

2006 ◽  
Vol 647 (1) ◽  
pp. 128-139 ◽  
Author(s):  
Dawn K. Erb ◽  
Charles C. Steidel ◽  
Alice E. Shapley ◽  
Max Pettini ◽  
Naveen A. Reddy ◽  
...  
Keyword(s):  
Star Formation ◽  
High Redshift ◽  
High Redshift Galaxies ◽  
Large Sample ◽  
Redshift Galaxies

scholarly journals High-redshift galaxies in the Hubble Deep Field: colour selection and star formation history to z   4

1996 ◽  
Vol 283 (4) ◽  
pp. 1388-1404 ◽  
Author(s):  
P. Madau ◽  
H. C. Ferguson ◽  
M. E. Dickinson ◽  
M. Giavalisco ◽  
C. C. Steidel ◽  
...  
Keyword(s):  
Star Formation ◽  
High Redshift ◽  
Star Formation History ◽  
High Redshift Galaxies ◽  
Formation History ◽  
Hubble Deep Field ◽  
Redshift Galaxies

scholarly journals Local Analogs to High-redshift Galaxies. I. Characterization of Dust Emission and Star Formation History

2021 ◽  
Vol 921 (2) ◽  
pp. 130
Author(s):  
Skarleth M. Motiño Flores ◽  
Tommy Wiklind ◽  
Rafael T. Eufrasio
Keyword(s):  
Star Formation ◽  
Dwarf Galaxies ◽  
High Redshift ◽  
Spectral Energy Distribution ◽  
Star Formation History ◽  
Spectral Energy ◽  
High Redshift Galaxies ◽  
Star Formation Activity ◽  
Look Back ◽  
Redshift Galaxies

Abstract Star-forming dwarf galaxies have properties similar to those expected in high-redshift galaxies. Hence, these local galaxies may provide insights into the evolution of the first galaxies and the physical processes at work. We present a sample of 11 potential local analogs to high-z (LAHz) galaxies. The sample consists of blue compact dwarf galaxies, selected to have spectral energy distributions that fit galaxies at 1.5 < z < 4. We use SOFIA-HAWC+ observations combined with optical and near-infrared data to characterize the dust properties, star formation rate (SFR), and star formation histories (SFHs) of the sample of LAHz galaxies. We employ Bayesian analysis to characterize the dust using two-component blackbody models. Using the Lightning package, we fit the spectral energy distribution of the LAHz galaxies over the far-UV−far-infrared wavelength range and derive the SFH in five time steps up to a look-back time of 13.3 Gyr. Of the 11 LAHz candidates, six galaxies have SFH consistent with no star formation activity at look-back times beyond 1 Gyr. The remaining galaxies show residual levels of star formation at ages ≳1 Gyr, making them less suitable as local analogs. The six young galaxies stand out in our sample by having the lowest gas-phase metallicities. They are characterized by warmer dust, having the highest specific SFR and the highest gas mass fractions. The young age of these six galaxies suggests that merging is less important as a driver of the star formation activity. The six LAHz candidates are promising candidates for studies of the gasdynamics role in driving star formation.

scholarly journals Diffraction Limited Imaging of High Redshift Galaxies with Adaptive Optics

2001 ◽  
Vol 205 ◽  
pp. 455-456 ◽  
Author(s):  
R.I. Davies ◽  
M. Lehnert ◽  
A.J. Baker ◽  
S. Rabien
Keyword(s):  
Adaptive Optics ◽  
Near Infrared ◽  
High Redshift ◽  
Diffraction Limit ◽  
High Redshift Galaxies ◽  
Distant Galaxies ◽  
Imaging And Spectroscopy ◽  
Intermediate Redshift ◽  
Initial Results ◽  
Redshift Galaxies

The major cornerstone of future ground-based astronomy is imaging and spectroscopy at the diffraction limit using adaptive optics. To exploit the potential of current AO systems, we have begun a survey around bright stars to study intermediate redshift galaxies at high resolution. Using ALFA to reach the diffraction limit of the 3.5-m telescope at Calar Alto allows us to study the structure of distant galaxies in the near-infrared at scales of 100-150 pc for z=0.05 and at scales 1.0-1.5 kpc at z=1. In this contribution we present the initial results of this project, which hint at the exciting prospects possible with the resolution and sensitivity available using an AO camera on the 8-m class VLT.

Sign in / Sign up

Export Citation Format

Share Document