Search Publications
On the Binary Frequency of the Lowest Mass Members of the Pleiades with Hubble Space Telescope Wide Field Camera 3
Dupuy, Trent J.; Liu, Michael C.; Deacon, Niall R. +2 more
We present the results of a Hubble Space Telescope Wide Field Camera 3 (WFC3) imaging survey of 11 of the lowest mass brown dwarfs in the Pleiades known (25-40 MJup). These objects represent the predecessors to T dwarfs in the field. Using a semi-empirical binary point-spread function (PSF)-fitting technique, we are able to probe to 0.″…
The Quasar-LBG Two-point Angular Cross-correlation Function at z~4 in the COSMOS Field
Sanders, D. B.; Taniguchi, Y.; Salvato, M. +15 more
In order to investigate the origin of quasars, we estimate the bias factor for low-luminosity quasars at high redshift for the first time. In this study, we use the two-point angular cross-correlation function (CCF) for both low-luminosity quasars at -24\lt {M}1450\lt -22 and Lyman-break galaxies (LBGs). Our sample consists of both 25 l…
Systematic Variations in CO2/H2O Ice Abundance Ratios in Nearby Galaxies Found with AKARI Near-infrared Spectroscopy
Oyabu, S.; Onaka, T.; Kaneda, H. +4 more
We report CO2/H2O ice abundance ratios in seven nearby star-forming galaxies based on the AKARI near-infrared (2.5-5.0 µm) spectra. The CO2/H2O ice abundance ratios show clear variations between 0.05 and 0.2 with the averaged value of 0.14 ± 0.01. The previous study on M82 revealed that the CO…
Constraining the Baryon Fraction in the Warm Hot Intergalactic Medium at Low Redshifts with Planck Data
Atrio-Barandela, F.; Mücket, J. P.; Génova-Santos, R. +1 more
We cross-correlate foreground cleaned Planck Nominal cosmic microwave background (CMB) maps with two templates constructed from the Two-Micron All-Sky Redshift Survey of galaxies. The first template traces the large-scale filamentary distribution characteristic of the Warm-Hot Intergalactic Medium (WHIM) out to ∼ 90 {{h}-1} Mpc. The sec…
A Multiwavelength Study of Tadpole Galaxies in the Hubble Ultra Deep Field
Ravindranath, Swara; de Mello, Duilia; Gardner, Jonathan P. +6 more
Multiwavelength data are essential in order to provide a complete picture of galaxy evolution and to inform studies of galaxies’ morphological properties across cosmic time. Here we present the results of a multiwavelength investigation of the morphologies of “tadpole” galaxies at intermediate redshift (0.314 < z < 3.175) in the Hubble Ultra…
Simulating Deep Hubble Images with Semi-empirical Models of Galaxy Formation
White, Richard L.; Fall, S. Michael; Szalay, Alexander S. +1 more
We simulate deep images from the Hubble Space Telescope (HST) using semi-empirical models of galaxy formation with only a few basic assumptions and parameters. We project our simulations all the way to the observational domain, adding cosmological and instrumental effects to the images, and analyze them in the same way as real HST images ("forward…
A Multiwavelength Study of Three Hybrid Blazars
Marshall, H. L.; Kharb, P.; Lister, M. L. +3 more
We present multiwavelength imaging observations of PKS 1045-188, 8C 1849+670, and PKS 2216-038, three radio-loud active galactic nuclei from the MOJAVE-Chandra Sample that straddle the Fanaroff-Riley (FR) boundary between low- and high-power jets. These hybrid sources provide an excellent opportunity to study jet emission mechanisms and the influe…
Optical Detection of the Pictor A Jet and Tidal Tail: Evidence against an IC/CMB jet
Perlman, Eric S.; Urry, C. Megan; Lenc, Emil +6 more
New images of the FR II radio galaxy Pictor A from the Hubble Space Telescope reveal a previously undiscovered tidal tail, as well as a number of jet knots coinciding with a known X-ray and radio jet. The tidal tail is approximately 5″ wide (3 kpc projected), starting 18″ (12 kpc) from the center of Pictor A, and extends more than 90″ (60 kpc). Th…
Constraints on Spatial Variations in the Fine-structure Constant from Planck
Cooray, Asantha; Smidt, Joseph; O'Bryan, Jon +1 more
We use the cosmic microwave background (CMB) anisotropy data from Planck to constrain the spatial fluctuations of the fine-structure constant α at a redshift of 1100. We use a quadratic estimator to measure the four-point correlation function of the CMB temperature anisotropies and extract the angular power spectrum fine-structure constant spatial…
Multi-wavelength Analysis of the Galactic Supernova Remnant MSH 11-61A
Auchettl, Katie; Slane, Patrick; Foster, Adam R. +2 more
Due to its centrally bright X-ray morphology and limb brightened radio profile, MSH 11-61A (G290.1-0.8) is classified as a mixed morphology supernova remnant (SNR). H i and CO observations determined that the SNR is interacting with molecular clouds found toward the north and southwest regions of the remnant. In this paper we report on the detecti…