Zobrazeno 1 - 10
of 102
pro vyhledávání: '"Younger, Joshua D."'
Autor:
Hopkins, Philip F., Croton, Darren, Bundy, Kevin, Khochfar, Sadegh, Bosch, Frank van den, Somerville, Rachel S., Wetzel, Andrew, Keres, Dusan, Hernquist, Lars, Stewart, Kyle, Younger, Joshua D., Genel, Shy, Ma, Chung-Pei
Publikováno v:
Astrophysical Journal, 724:915-945, 2010
Different methodologies lead to order-of-magnitude variations in predicted galaxy merger rates. We examine and quantify the dominant uncertainties. Different halo merger rates and subhalo 'destruction' rates agree to within a factor ~2 given proper c
Externí odkaz:
http://arxiv.org/abs/1004.2708
Autor:
Younger, Joshua D., Hopkins, Philip F.
We present a physical model for origin of the cosmic diffuse infrared background (CDIRB). By utilizing the observed stellar mass function and its evolution as input to a semi-empirical model of galaxy formation, we isolate the physics driving diffuse
Externí odkaz:
http://arxiv.org/abs/1003.4733
Autor:
Hopkins, Philip F., Younger, Joshua D., Hayward, Christopher C., Narayanan, Desika, Hernquist, Lars
Publikováno v:
Mon.Not.Roy.Astron.Soc. 402:1693-1713, 2010
We use a novel method to predict the contribution of normal star-forming galaxies, merger-induced bursts, and obscured AGN, to IR luminosity functions (LFs) and global SFR densities. We use empirical halo occupation constraints to populate halos with
Externí odkaz:
http://arxiv.org/abs/0911.1131
Autor:
Narayanan, Desika, Dey, Arjun, Hayward, Christopher, Cox, Thomas J., Bussmann, R. Shane, Brodwin, Mark, Jonsson, Patrik, Hopkins, Philip, Groves, Brent, Younger, Joshua D., Hernquist, Lars
We present a physical model for the origin of z~2 Dust-Obscured Galaxies (DOGs), a class of high-redshift ULIRGs selected at 24 micron which are particularly optically faint (24/R>1000). By combining N-body/SPH simulations of high redshift galaxy evo
Externí odkaz:
http://arxiv.org/abs/0910.2234
Autor:
Hopkins, Philip F., Bundy, Kevin, Croton, Darren, Hernquist, Lars, Keres, Dusan, Khochfar, Sadegh, Stewart, Kyle, Wetzel, Andrew, Younger, Joshua D.
Publikováno v:
Astrophys.J.715:202-229,2010
We use a suite of semi-empirical models to predict galaxy merger rates and contributions to bulge growth as functions of merger mass, redshift, and mass ratio. The models use empirical halo occupation constraints to identify mergers, together with hi
Externí odkaz:
http://arxiv.org/abs/0906.5357
We present a model for the CO molecular line emission from high redshift Submillimeter Galaxies (SMGs). By combining hydrodynamic simulations of gas rich galaxy mergers with the polychromatic radiative transfer code, Sunrise, and the 3D non-LTE molec
Externí odkaz:
http://arxiv.org/abs/0905.2184
Autor:
Narayanan, Desika, Hayward, Christopher C., Cox, Thomas J., Hernquist, Lars, Jonsson, Patrik, Younger, Joshua D., Groves, Brent
We describe a model for the formation of \zsim 2 Submillimeter Galaxies (SMGs) which simultaneously accounts for both average and bright SMGs while providing a reasonable match to their mean observed spectral energy distributions (SEDs). By coupling
Externí odkaz:
http://arxiv.org/abs/0904.0004
Autor:
Younger, Joshua D., Fazio, Giovanni G., Wilner, David J., Ashby, Matthew L. N., Blundell, Raymond, Gurwell, Mark A., Huang, Jia-Sheng, Iono, Daisuke, Peck, Alison B., Petitpas, Glen R., Scott, Kimberly S., Wilson, Grant W., Yun, Min S.
We present high resolution submillimeter interferometric imaging of two of the brightest high-redshift submillimeter galaxies known: GN20 and AzTEC1 at 0.8 and 0.3 arcsec resolution respectively. Our data - the highest resolution submillimeter imagin
Externí odkaz:
http://arxiv.org/abs/0807.2243
The outer regions of disk galaxies show a drop-off in optical and Halpha emission, suggesting a star formation threshold radius, assumed to owe to a critical surface density below which star formation does not take place. Signs of filamentary star fo
Externí odkaz:
http://arxiv.org/abs/0807.1116
Publikováno v:
Astrophys.J. 688:757-769 (2008)
Previous models of galactic disk heating in interactions invoke restrictive assumptions not necessarily valid in modern LCDM contexts: that satellites and orbits are rigid and circular, with slow decay over many orbital times from dynamical friction.
Externí odkaz:
http://arxiv.org/abs/0806.2861