scholarly journals Contribution of the first galaxies to the cosmic far-infrared/sub-millimeter background – I. Mean background level

2016 ◽  
Vol 465 (3) ◽  
pp. 3668-3679 ◽  
Author(s):  
María Emilia De Rossi ◽  
Volker Bromm
Keyword(s):  
Background Level ◽  
Far Infrared ◽  
First Galaxies

scholarly journals ALMA witnesses the assembly of first galaxies

2019 ◽  
Vol 15 (S352) ◽  
pp. 27-32
Author(s):  
Stefano Carniani
Keyword(s):  
Star Formation ◽  
Physical Properties ◽  
Rest Frame ◽  
Near Infrared ◽  
Far Infrared ◽  
Star Forming ◽  
Surrounding Environment ◽  
Infrared Surveys ◽  
Formation And Evolution ◽  
First Galaxies

AbstractCharacterising primeval galaxies entails the challenging goal of observing galaxies with modest star formation rates (SFR < 100 Mȯyr−1) and approaching the beginning of the reionisation epoch (z > 6). To date a large number of primeval galaxies have been identified thanks to deep near-infrared surveys. However, to further our understanding on the formation and evolution of such primeval objects, we must investigate their nature and physical properties through multi-band spectroscopic observations. Information on dust content, metallicity, interactions with the surrounding environment, and outflows can be obtained with ALMA observations of far-infrared (FIR) lines such as the [Cii] at 158 μm and [Oiii] at 88 μm. Here, we, thus, discuss the recent results unveiled by ALMA observations and present new [Cii] observations of BDF-3299, a star-forming galaxy at z = 7.1 showing a spatial and spectral offset between the rest-frame UV and the FIR lines emission.

scholarly journals Panchromatic study of the first galaxies with large ALMA programs

2019 ◽  
Vol 15 (S341) ◽  
pp. 12-16 ◽  
Author(s):  
A. Faisst ◽  
M. Béthermin ◽  
P. Capak ◽  
P. Cassata ◽  
O. Le Fèvre ◽  
...  
Keyword(s):  
Galaxy Formation ◽  
High Redshift ◽  
Optical Emission ◽  
Far Infrared ◽  
Photometric Redshifts ◽  
Galaxy Formation And Evolution ◽  
Major Player ◽  
Imaging And Spectroscopy ◽  
First Galaxies ◽  
Stellar Masses

AbstractThanks to deep optical to near-IR imaging and spectroscopy, significant progress is made in characterizing the rest-frame UV to optical properties of galaxies in the early universe (z > 4. Surveys with Hubble, Spitzer, and ground-based facilities (Keck, Subaru, and VLT) provide spectroscopic and photometric redshifts, measurements of the spatial structure, stellar masses, and optical emission lines for large samples of galaxies. Recently, the Atacama Large (Sub) Millimeter Array (ALMA) has become a major player in pushing studies of high redshift galaxies to far-infrared wavelengths, hence making panchromatic surveys over many orders of frequencies possible. While past studies focused mostly on bright sub-millimeter galaxies, the sensitivity of ALMA now enables surveys like ALPINE, which focuses on measuring the gas and dust properties of a large sample of normal main-sequence galaxies at z > 4. Combining observations across different wavelengths into a single, panchromatic picture of galaxy formation and evolution is currently and in the future an important focus of the astronomical community.

scholarly journals UV regulated star formation in high-redshift galaxies

2019 ◽  
Vol 490 (2) ◽  
pp. 2706-2716 ◽  
Author(s):  
Muhammad A Latif ◽  
Sadegh Khochfar
Keyword(s):  
Star Formation ◽  
Galaxy Formation ◽  
Background Radiation ◽  
High Redshift ◽  
Three Dimensional ◽  
Background Level ◽  
Reaction Rates ◽  
Big Bang ◽  
Dense Gas ◽  
First Galaxies

ABSTRACT The first galaxies forming a few hundred million years after the big bang are the key drivers of cosmic evolution and ideal laboratories to study theories of galaxy formation. We here study the role of UV radiation in suppressing star formation in primordial galaxies by destroying molecular hydrogen, the main coolant in primordial gas, and provide estimates of cold dense gas at the onset of star formation. To accomplish this goal, we perform three-dimensional cosmological simulations of minihaloes in different environments forming at z ∼ 25 by varying strength of background UV flux below the Lyman limit between 0.01–1000 in units of $\rm J_{21}=10^{-21}\, erg \,cm^{-2} \,s^{-1} \,Hz^{-1} \,sr^{-1}$. Particularly, we include photodetachment of $\rm H^-$, the self-shielding of $\rm H_2$, which both were neglected in previous studies and use updated reaction rates. Our results show that depending on the background level $\rm H_2$ formation is suppressed, delaying gravitational collapse until haloes reach the atomic cooling limit. We find that the formation of cold dense molecular gas and subsequently star formation gets delayed by 100–230 Myr depending on the level of the background radiation and the growth history of the dark matter haloes. The fraction of dense self-shielded gas is a strong function of the background flux and exponentially declines with the strength of incident UV flux above $\rm J_{21} \ge 1$. We find that taking into account $\rm H_2$ self-shielding is crucial for accurately estimating the amount of cold dense gas available for star formation.

scholarly journals Determination of the cosmic far-infrared background level with the ISOPHOT instrument

2009 ◽  
Vol 500 (2) ◽  
pp. 763-768 ◽  
Author(s):  
M. Juvela ◽  
K. Mattila ◽  
D. Lemke ◽  
U. Klaas ◽  
C. Leinert ◽  
...  
Keyword(s):  
Background Level ◽  
Far Infrared ◽  
Infrared Background

scholarly journals Redshift Horizon for Detecting the First Galaxies in Far-infrared Surveys

2019 ◽  
Vol 883 (2) ◽  
pp. 113 ◽  
Author(s):  
María Emilia De Rossi ◽  
Volker Bromm
Keyword(s):  
Far Infrared ◽  
Infrared Surveys ◽  
First Galaxies

Computer simulation of the far infrared collision induced absorption spectra of gaseous CO2

1998 ◽  
Vol 93 (6) ◽  
pp. 1007-1016 ◽  
Author(s):  
MARCIN GRUSZKA ◽  
ALEKSANDRA BORYSOW
Keyword(s):  
Computer Simulation ◽  
Absorption Spectra ◽  
Far Infrared ◽  
Induced Absorption

Far-Infrared Spectroscopy of Diffuse Interstellar Medium - Large Silicon Abundance and Effects of UV Radiation

2002 ◽  
Vol 4 ◽  
pp. 303-303
Author(s):  
T. Onaka ◽  
Y. Okada ◽  
M. Mizutani ◽  
Y. Doi ◽  
H. Shibai
Keyword(s):  
Infrared Spectroscopy ◽  
Interstellar Medium ◽  
Uv Radiation ◽  
Far Infrared ◽  
Far Infrared Spectroscopy

Far-infrared dust opacity and visible extinction

2002 ◽  
Vol 4 ◽  
pp. 291-291
Author(s):  
L. Cambrésy ◽  
F. Boulanger ◽  
G. Lagache ◽  
B. Stepnik
Keyword(s):  
Far Infrared

Far infrared study of the giant star forming complex W 51

2002 ◽  
Vol 4 ◽  
pp. 333-333
Author(s):  
S. K. Ghosh ◽  
D. K. Ojha ◽  
R. P. Verma
Keyword(s):  
Far Infrared ◽  
Infrared Study ◽  
Giant Star ◽  
Star Forming
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