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Full-Text Articles in Physical Sciences and Mathematics
Erasing Dark Matter Cusps In Cosmological Galactic Halos With Baryons, Emilio Romano-Diaz, Isaac Shlosman, Yehuda Hoffman, Clayton Heller
Erasing Dark Matter Cusps In Cosmological Galactic Halos With Baryons, Emilio Romano-Diaz, Isaac Shlosman, Yehuda Hoffman, Clayton Heller
Department of Physics and Astronomy Faculty Publications
We study the central dark matter (DM) cusp evolution in cosmologically grown galactic halos. Numerical models with and without baryons (baryons+DM, hereafter BDM model, and pure DM, PDM model, respectively) are advanced from identical initial conditions, obtained using the Constrained Realization method. The DM cusp properties are contrasted by a direct comparison of pure DM and baryonic models. We find a divergent evolution between the PDM and BDM models within the inner few × 10 kpc region. The PDM model forms an R−1 cusp as expected, while the DM in the BDM model forms a larger isothermal cusp R …
The Physical Scale Of The Far-Infrared Emission In The Most Luminous Submillimeter Galaxies, Jd Younger, Gg Fazio, Dj Wilner, Mln Ashby, R Blundell, Ma Gurwell, Js Huang, D Iono, Ab Peck, Gr Petitpas, Ks Scott, Gw Wilson, Min Yun
The Physical Scale Of The Far-Infrared Emission In The Most Luminous Submillimeter Galaxies, Jd Younger, Gg Fazio, Dj Wilner, Mln Ashby, R Blundell, Ma Gurwell, Js Huang, D Iono, Ab Peck, Gr Petitpas, Ks Scott, Gw Wilson, Min Yun
Astronomy Department Faculty Publication Series
We present high-resolution submillimeter interferometric imaging of two of the brightest high-redshift submillimeter galaxies known: GN 20 and AzTEC1 at 0.8'' and 0.3'' resolution, respectively. Our data—the highest resolution submillimeter imaging of high-redshift sources accomplished to date—were collected in three different array configurations: compact, extended, and very extended. We derive angular sizes of 0.6'' and 1.0'' for GN 20 and 0.3'' and 0.4'' for AzTEC1 from modeling their visibility functions as a Gaussian and an elliptical disk, respectively. Because both sources are B-band dropouts, they likely lie within a relatively narrow redshift window around z ~ 4, which indicates …
Star Formation Rates In Lyman Break Galaxies: Radio Stacking Of Lbgs In The Cosmos Field And The Sub-Mu Jy Radio Source Population, Cl Carilli, N Lee, P Capak, E Schinnerer, Ks Lee, H Mccraken, Min Yun, N Scoville, V Smolcic, M Giavalisco, A Datta, Y Taniguchi, Cm Urry
Star Formation Rates In Lyman Break Galaxies: Radio Stacking Of Lbgs In The Cosmos Field And The Sub-Mu Jy Radio Source Population, Cl Carilli, N Lee, P Capak, E Schinnerer, Ks Lee, H Mccraken, Min Yun, N Scoville, V Smolcic, M Giavalisco, A Datta, Y Taniguchi, Cm Urry
Astronomy Department Faculty Publication Series
We present an analysis of the radio properties of large samples of Lyman break galaxies (LBGs) at z ~ 3, 4, and 5 from the COSMOS field. The median stacking analysis yields a statistical detection of the z ~ 3 LBGs (U-band dropouts), with a 1.4 GHz flux density of 0.90 ± 0.21 μJy. The stacked emission is unresolved, with a size <1, or a physical size <8 kpc. The total star formation rate implied by this radio luminosity is 31 ± 7 M yr−1, based on the radio-FIR correlation in low-redshift star-forming galaxies. The star formation rate derived from a similar analysis of the UV luminosities is 17 M yr−1, without any correction for …