Search Publications
Interacting Cosmic Rays with Molecular Clouds: A Bremsstrahlung Origin of Diffuse High-energy Emission from the Inner 2°×1° of the Galactic Center
Hewitt, J. W.; Nobukawa, M.; Tsuru, T. G. +8 more
The high-energy activity in the inner few degrees of the Galactic center is traced by diffuse radio, X-ray, and γ-ray emission. The physical relationship between different components of diffuse gas emitting at multiple wavelengths is a focus of this work. We first present radio continuum observations using the Green Bank Telescope and model the no…
SN 2009ip à la PESSTO: no evidence for core collapse yet
Zhou, George; Fraser, Morgan; Benetti, Stefano +35 more
We present ultraviolet, optical and near-infrared observations of the interacting transient SN 2009ip, covering the period from the start of the outburst in 2012 October until the end of the 2012 observing season. The transient reached a peak magnitude of MV = -17.7 mag, with a total integrated luminosity of 1.9 × 1049 erg ov…
Detection of a Noble Gas Molecular Ion, 36ArH+, in the Crab Nebula
Ivison, R. J.; Olofsson, G.; Krause, O. +9 more
Noble gas molecules have not hitherto been detected in space. From spectra obtained with the Herschel Space Observatory, we report the detection of emission in the 617.5- and 1234.6-gigahertz J = 1-0 and 2-1 rotational lines of 36ArH+ at several positions in the Crab Nebula, a supernova remnant known to contain both molecular…
Obtaining the CMB anomalies with a bounce from the contracting phase to inflation
Liu, Zhi-Guo; Guo, Zong-Kuan; Piao, Yun-Song
Recent Planck data show the anomalies of cosmic microwave background (CMB) fluctuations on large angular scales, which confirms the early observations by WMAP. We continue studying an inflationary model, in which before the slow-roll inflation the universe is in a contracting phase, and fit the model with the Planck data. We show that this model m…
An observed correlation between plume activity and tidal stresses on Enceladus
Sotin, C.; Brown, R. H.; Baines, K. H. +6 more
Saturn's moon Enceladus emits a plume of water vapour and micrometre-sized ice particles from a series of warm fissures located near its south pole. This geological activity could be powered or controlled by variations in the tidal stresses experienced by Enceladus as it moves around its slightly eccentric orbit. The specific mechanisms by which t…
The Lyman Alpha Reference Sample: Extended Lyman Alpha Halos Produced at Low Dust Content
Verhamme, Anne; Cannon, John M.; Hayes, Matthew +14 more
We report on new imaging observations of the Lyman alpha emission line (Lyα), performed with the Hubble Space Telescope, that comprise the backbone of the Lyman alpha Reference Sample. We present images of 14 starburst galaxies at redshifts 0.028 < z < 0.18 in continuum-subtracted Lyα, Hα, and the far ultraviolet continuum. We show that Lyα …
Cosmic Shear Results from the Deep Lens Survey. I. Joint Constraints on Ω M and σ8 with a Two-dimensional Analysis
Tyson, J. Anthony; Hilbert, Stefan; Schneider, Michael D. +3 more
We present a cosmic shear study from the Deep Lens Survey (DLS), a deep BVRz multi-band imaging survey of five 4 deg2 fields with two National Optical Astronomy Observatory (NOAO) 4 m telescopes at Kitt Peak and Cerro Tololo. For both telescopes, the change of the point-spread-function (PSF) shape across the focal plane is complicated, …
Extragalactic Millimeter-wave Point-source Catalog, Number Counts and Statistics from 771 deg2 of the SPT-SZ Survey
Béthermin, M.; Rest, A.; Chapman, S. +54 more
We present a point-source catalog from 771 deg2 of the South Pole Telescope Sunyaev-Zel'dovich survey at 95, 150, and 220 GHz. We detect 1545 sources above 4.5σ significance in at least one band. Based on their relative brightness between survey bands, we classify the sources into two populations, one dominated by synchrotron emission f…
Asteroid Belts in Debris Disk Twins: Vega and Fomalhaut
Hughes, A. Meredith; Wilner, David J.; Rieke, George H. +8 more
Vega and Fomalhaut are similar in terms of mass, ages, and global debris disk properties; therefore, they are often referred to as "debris disk twins." We present Spitzer 10-35 µm spectroscopic data centered at both stars and identify warm, unresolved excess emission in the close vicinity of Vega for the first time. The properties of the war…
Evolution of the Stellar-to-dark Matter Relation: Separating Star-forming and Passive Galaxies from z = 1 to 0
Leauthaud, Alexie; Massey, Richard; Rhodes, Jason +5 more
We use measurements of the stellar mass function, galaxy clustering, and galaxy-galaxy lensing within the COSMOS survey to constrain the stellar-to-halo mass relation (SHMR) of star forming and quiescent galaxies over the redshift range z = [0.2, 1.0]. For massive galaxies, M * >~ 1010.6 M ⊙, our results indicat…