Radio studies of galaxy formation: Dense Gas History of the Universe
Chris Carilli,Fabian Walter,Dominik A. Riechers,Ran Wang,Emanuele Daddi,Jeff Wagg,Frank Bertoldi,Karl M. Menten +7 more
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In this paper, the authors summarize the techniques of radio astronomy to perform these studies, then review the progress on radio studies of galaxy formation, and consider the possibility of tracing out the dense gas history of the Universe and perform initial, admittedly gross, calculations.Abstract:
Line and continuum studies at centimeter through submillimeter wavelengths address probe deep into the earliest, most active and dust obscured phases of galaxy formation, and reveal the molecular and cool atomic gas. We summarize the techniques of radio astronomy to perform these studies, then review the progress on radio studies of galaxy formation. The dominant work over the last decade has focused on massive, luminous starburst galaxies (submm galaxies and AGN host galaxies). The far infrared luminosities are ~ 1e13 Lsun, implying star formation rates, SFR > 1e3 Msun/year. Molecular gas reservoirs are found with masses: M(H_2) > 1e10 (alpha/0.8}) Msun. The CO excitation in these luminous systems is much higher than in low redshift spiral galaxies. Imaging of the gas distribution and dynamics suggests strongly interacting and merging galaxies, indicating gravitationally induced, short duration (~ 1e7 year) starbursts. These systems correspond to a major star formation episode in massive galaxies in proto-clusters at intermediate to high redshift. Recently, radio observations have probed the more typical star forming galaxy population (SFR ~ 100 Msun/year), during the peak epoch of Universal star formation (z ~ 1.5 to 2.5). These observations reveal massive gas reservoirs without hyper-starbursts, and show that active star formation occurs over a wide range in galaxy stellar mass. The conditions in this gas are comparable to those found in the Milky Way disk. A key result is that the peak epoch of star formation in the Universe also corresponds to an epoch when the baryon content of star forming galaxies was dominated by molecular gas, not stars. We consider the possibility of tracing out the dense gas history of the Universe, and perform initial, admittedly gross, calculations. ABRIDGEDread more
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References
More filters
Journal ArticleDOI
Star formation in galaxies along the hubble sequence
TL;DR: In this article, the authors focus on the broad patterns in the star formation properties of galaxies along the Hubble sequence and their implications for understanding galaxy evolution and the physical processes that drive the evolution.
Journal ArticleDOI
Interstellar dust grains
TL;DR: In this article, the authors survey the observed properties of interstellar dust grains: the wavelength-dependent extinction of starlight, including absorption features, from UV to infrared; optical luminescence; and optical luminance.
Journal ArticleDOI
Ultraluminous infrared galaxies and the origin of quasars
David B. Sanders,B. T. Soifer,J. H. Elias,Barry F. Madore,Keith Matthews,G. Neugebauer,Nick Scoville +6 more
TL;DR: In this article, ground-based observations of a complete sample of 10 of these infrared galaxies suggest that they represent the initial dust-enshrouded stages of quasars, and a second group of ultraluminous objects selected on the basis of warm infrared colors are found to be preferentially Seyfert galaxies.
Journal ArticleDOI
High-redshift galaxies in the hubble deep field : colour selection and star formation history to z 4
Piero Madau,Henry C. Ferguson,Mark Dickinson,Mauro Giavalisco,Charles C. Steidel,Andrew S. Fruchter +5 more
TL;DR: In this paper, a sample of star-forming galaxies at 2 ≲z ≲ 4.5 was constructed from the Hubble Deep Field (HDF) images, which is 3 times higher than the local value but still 4 times lower than the rate observed at z ≈ 1.75.
Journal ArticleDOI
Atlas of quasar energy distributions
Martin Elvis,Belinda Jane Wilkes,Jonathan C. McDowell,Richard F. Green,Jill Bechtold,Steven P. Willner,M. S. Oey,M. S. Oey,Elisha Polomski,Elisha Polomski,Roc Cutri +10 more
TL;DR: In this article, the spectral energy distributions (SEDs) of normal, nonblazar, quasars over the whole available range (radio to 10 keV X-rays) of the electromagnetic spectrum are presented.