Search Publications
Investigating the Covering Fraction Distribution of Swift/BAT AGNs with X-Ray and Infrared Observations
Ricci, Claudio; Goulding, Andy D.; Bauer, Franz E. +13 more
We present an analysis of a sample of 69 local obscured Swift/Burst Alert Telescope active galactic nuclei (AGNs) with X-ray spectra from NuSTAR and infrared (IR) spectral energy distributions from Herschel and WISE. We combine this X-ray and IR phenomenological modeling and find a significant correlation between reflected hard X-ray emission and …
The Impact of Turbulent Solar Wind Fluctuations on Solar Orbiter Plasma Proton Measurements
Owen, C. J.; Nicolaou, G.; Verscharen, D. +1 more
Solar Orbiter will observe the Sun and the inner heliosphere to study the connections between solar activity, coronal structure, and the origin of the solar wind. The plasma instruments on board Solar Orbiter will determine the three-dimensional velocity distribution functions of the plasma ions and electrons with high time resolution. The analysi…
Powerful AGN jets and unbalanced cooling in the hot atmosphere of IC 4296
Mernier, F.; Fabian, A. C.; Sun, M. +13 more
We present new Karl G. Jansky Very Large Array (VLA, 1.5 GHz) radio data for the giant elliptical galaxy IC 4296, supported by archival radio, X-ray (Chandra, and XMM-Newton) and optical (SOAR, and HST) observations. The galaxy hosts powerful radio jets piercing through the inner hot X-ray emitting atmosphere, depositing most of the energy into th…
Evidence for Asymmetry in the Velocity Distribution of the Interstellar Neutral Helium Flow Observed by IBEX and Ulysses
Wood, Brian E.; Müller, Hans-Reinhard; Möbius, Eberhard
We use observations from the Interstellar Boundary Explorer (IBEX) and Ulysses to explore the possibility that the interstellar neutral helium flowing through the inner solar system possesses an intrinsic non-Maxwellian velocity distribution. In fitting the IBEX and Ulysses data, we experiment with both a kappa distribution and a bi-Maxwellian, in…
Subkiloparsec Imaging of Lyα Emission in a Low-mass, Highly Ionized, Gravitationally Lensed Galaxy at z = 1.84
Pettini, Max; Erb, Dawn K.; Brammer, Gabriel +3 more
Low-mass, low-metallicity galaxies at low to moderate (z ≲ 3) redshifts offer the best opportunity for detailed examination of the interplay between massive stars, ionizing radiation and gas in sources similar to those that likely reionized the universe. We present new narrowband Hubble Space Telescope observations of {Ly}α emission and the adjace…
Searching for cool and cooling X-ray emitting gas in 45 galaxy clusters and groups
Fabian, Andrew C.; Sanders, Jeremy S.; Pinto, Ciro +2 more
We present a spectral analysis of cool and cooling gas in 45 cool-core clusters and groups of galaxies obtained from Reflection Grating Spectrometer (RGS) XMM-Newton observations. The high-resolution spectra show Fe XVII emission in many clusters, which implies the existence of cooling flows. The cooling rates are measured between the bulk intracl…
Spectroscopic Follow-up of Discoveries from the NEOWISE Proper Motion Survey
Cushing, Michael C.; Kirkpatrick, J. Davy; Burgasser, Adam J. +2 more
We present low-resolution near-infrared spectra of discoveries from an all-sky proper motion search conducted using multi-epoch data from the Wide-field Infrared Survey Explorer. Using the data from NEOWISE, along with the AllWISE catalog, Schneider et al. conducted an all-sky proper motion survey to search for nearby objects with high proper moti…
Morphometric evidence of 3.6 Ga glacial valleys and glacial cirques in martian highlands: South of Terra Sabaea
Mercier, Denis; Costard, François; Bouley, Sylvain +2 more
The climate of early Mars remains unclear and the debate is topical. Recently, climatic models have suggested a cold climate during the Noachian/Early Hesperian on Mars, which goes against the wet and warm climate often put forward. The purpose of this study is to seek geomorphologic evidence of this early cold climate. To achieve this, a step-by-…
Searching for environmental effects on galaxy kinematics in groups and clusters at z ∼ 1 from the ORELSE survey
Shen, Lu; Kocevski, Dale D.; Tresse, Laurence +9 more
We present an investigation of the dependence of galaxy kinematics on the environment for a sample of 94 star-forming galaxies at z ∼ 0.9 from the ORELSE survey. ORELSE is a large photometric and spectroscopic campaign dedicated to mapping out and characterizing galaxy properties across a full range of environments in 15 fields containing large-sc…
Gamma-ray emitting narrow-line Seyfert 1 galaxies: Past, present, and future
Paliya, Vaidehi S.
This article reviews our current understanding about