Search Publications
On the Robustness of z = 0-1 Galaxy Size Measurements through Model and Non-parametric Fits
Franx, Marijn; Williams, Rik J.; Mosleh, Moein
We present the size-stellar mass relations of nearby (z = 0.01-0.02) Sloan Digital Sky Survey galaxies, for samples selected by color, morphology, Sérsic index n, and specific star formation rate. Several commonly employed size measurement techniques are used, including single Sérsic fits, two-component Sérsic models, and a non-parametric method. …
Hemispheric Asymmetries of Solar Photospheric Magnetism: Radiative, Particulate, and Heliospheric Impacts
Cirtain, Jonathan W.; McIntosh, Scott W.; Leamon, Robert J. +7 more
Among many other measurable quantities, the summer of 2009 saw a considerable low in the radiative output of the Sun that was temporally coincident with the largest cosmic-ray flux ever measured at 1 AU. Combining measurements and observations made by the Solar and Heliospheric Observatory (SOHO) and Solar Dynamics Observatory (SDO) spacecraft we …
An Ab Initio Model for Cosmic-ray Modulation
Burger, R. A.; Engelbrecht, N. E.
A proper understanding of the effects of turbulence on the diffusion and drift of cosmic rays (CRs) is of vital importance for a better understanding of CR modulation in the heliosphere. This study presents an ab initio model for CR modulation, incorporating for the first time the results yielded by a two-component turbulence transport model. This…
The Excitation of HCN and HCO+ in the Galactic Center Circumnuclear Disk
Morris, M. R.; Mills, E. A. C.; Güsten, R. +1 more
We present new observations of HCN and HCO+ in the circumnuclear disk (CND) of the Galaxy, which we obtained with the Atacama Pathfinder Experiment telescope. We mapped emission in rotational lines of HCN J = 3-2, 4-3, and 8-7, as well as of HCO+ J = 3-2, 4-3, and 9-8. We also present spectra of H13CN J = 3-2 and 4…
Turbulent Dynamics in Solar Flare Sheet Structures Measured with Local Correlation Tracking
McKenzie, D. E.
High-resolution observations of the Sun's corona in extreme ultraviolet and soft X-rays have revealed a new world of complexity in the sheet-like structures connecting coronal mass ejections (CMEs) to the post-eruption flare arcades. This article presents initial findings from an exploration of dynamic flows in two flares observed with Hinode/XRT …
PS1-10afx at z = 1.388: Pan-STARRS1 Discovery of a New Type of Superluminous Supernova
Price, P. A.; Berger, E.; Challis, P. +32 more
We present the Pan-STARRS1 discovery of PS1-10afx, a unique hydrogen-deficient superluminous supernova (SLSN) at redshift z = 1.388. The light curve peaked at z P1 = 21.7 mag, making PS1-10afx comparable to the most luminous known SNe, with Mu = -22.3 mag. Our extensive optical and near-infrared observations indicate that the…
A Tentative Detection of an Emission Line at 1.6 µm for the z ~ 12 Candidate UDFj-39546284
van Dokkum, Pieter G.; Franx, Marijn; Illingworth, Garth D. +5 more
We present deep WFC3 grism observations of the candidate z ~ 12 galaxy UDFj-39546284 in the Hubble Space Telescope (HST) Ultra Deep Field (UDF), by combining spectroscopic data from the 3D-HST and CANDELS surveys. The total exposure time is 40.5 ks and the spectrum covers 1.10 < λ < 1.65 µm. We search for faint emission lines by cross-…
Hubble Space Telescope ACS Imaging of the GOALS Sample: Quantitative Structural Properties of Nearby Luminous Infrared Galaxies with L IR > 1011.4 L ⊙
Sanders, D. B.; Kim, D. -C.; Surace, J. A. +11 more
A Hubble Space Telescope/Advanced Camera for Surveys study of the structural properties of 85 luminous and ultraluminous (L IR > 1011.4 L ⊙) infrared galaxies (LIRGs and ULIRGs) in the Great Observatories All-sky LIRG Survey (GOALS) sample is presented. Two-dimensional GALFIT analysis has been performed on F814W…
Active Galactic Nucleus Feedback at z ~ 2 and the Mutual Evolution of Active and Inactive Galaxies
Cimatti, A.; Daddi, E.; Rodighiero, G. +7 more
The relationship between galaxies of intermediate stellar mass and moderate luminosity active galactic nuclei (AGNs) at 1 < z < 3 is investigated with a Galaxy Mass Assembly ultra-deep Spectroscopic Survey (GMASS) sample complemented with public data in the GOODS-South field. Using X-ray data, hidden AGNs are identified in unsuspected star-f…
The Nature of Filamentary Cold Gas in the Core of the Virgo Cluster
Simionescu, A.; von der Linden, A.; Fabian, A. C. +10 more
We present a multi-wavelength study of the emission-line nebulae located ~38'' (3 kpc in projection) southeast of the nucleus of M87, the central dominant galaxy of the Virgo Cluster. We report the detection of far-infrared (FIR) [C II] line emission at 158 µm from the nebulae using observations made with the Herschel Photodetector Array Cam…