Publications (9)
Spitzer UltRa Faint SUrvey Program (SURFS UP) I: An Overview
MaruÅ¡a BradaÄ, Russell Ryan, Stefano Casertano +14
SURFSUP is a joint Spitzer and HST Exploration Science program using 10 galaxy clusters as cosmic telescopes to study z >~ 7 galaxies at intrinsically lower luminosities, enabled b…
Comparative Direct Analysis of Type Ia Supernova Spectra. III. Premaximum
David Branch, M. A. Troxel, David J. Jeffery +8
A comparative study of spectra of 21 Type Ia supernovae (SNe Ia) obtained about one week before maximum light, and 8 spectra obtained 11 or more days before maximum, is presented.…
Using the Bullet Cluster as a Gravitational Telescope to Study z~7 Lyman Break Galaxies
Nicholas Hall, Marusa Bradac, Anthony H. Gonzalez +7
We use imaging obtained with the Hubble Space Telescope Wide Field Camera 3 to search for z_850 dropouts at z~7 and J_110 dropouts at z~9 lensed by the Bullet Cluster. In total we…
Comparative Direct Analysis of Type Ia Supernova Spectra. II. Maximum Light
David Branch, Leeann Chau Dang, Nicholas Hall +7
A comparative study of near-maximum-light optical spectra of 24 Type Ia supernovae (SNe Ia) is presented. The spectra are quantified in two ways, and assigned to four groups. Seven…
Is Your Model Risk ALARP? Evaluating Prospective Safety-Critical Applications of Complex Models
Domenic Di Francesco, Alan Forrest, Fiona McGarry +2
The increasing availability of advanced computational modelling offers new opportunities to improve safety, efficacy, and emissions reductions. Application of complex models to sup…
Spectroscopic Confirmation of a z=6.740 Galaxy behind the Bullet Cluster
MaruÅ¡a BradaÄ, Eros Vanzella, Nicholas Hall +7
We present the first results of our spectroscopic follow-up of 6.5 < z < 10 candidate galaxies behind clusters of galaxies. We report the spectroscopic confirmation of an intrinsic…
Comparative Direct Analysis of Spectra of Type Ia Supernovae. I. SN 1994D
David Branch, E. Baron, Nicholas Hall +2
As the first step in a comprehensive, comparative, direct analysis of the spectra of Type Ia supernovae (SNe Ia), we use the parameterized supernova synthetic-spectrum code, SYNOW,…
A Comparative Study of Velocity Statistics of Hydrodynamic and Magnetohydrodynamic Turbulence
Nicholas Hall, G. Kowal, A. Lazarian +1
Turbulence in an incompressible fluid with and without a magnetic field as well as moderately compressible MHD turbulence are compared. For the magnetohydrodynamic (MHD) models the…
Improving the Calibration of Type Ia Supernovae Using Late-time Lightcurves
Yun Wang, Nicholas Hall
The use of Type Ia supernovae (SNe Ia) as cosmological standard candles is a key to solving the mystery of dark energy. Improving the calibration of SNe Ia increases their power as…