Search Publications
Quasars in the Galactic Anti-Center Area from LAMOST DR3
Zhang, Yong; Yuan, Hai-Bo; Huang, Yang +11 more
We present a sample of quasars discovered in an area near the Galactic Anti-Center covering 150^\circ ≤ l≤ 210^\circ and | b| ≤ 30^\circ , based on LAMOST Data Release 3 (DR3). This sample contains 151 spectroscopically confirmed quasars. Among them 80 are newly discovered with LAMOST. All these quasars are very bright, with i magnitudes peaking a…
Supra-galactic colour patterns in globular cluster systems
Forte, Juan C.
An analysis of globular cluster systems associated with galaxies included in the Virgo and Fornax Hubble Space Telescope-Advanced Camera Surveys reveals distinct (g - z) colour modulation patterns. These features appear on composite samples of globular clusters and, most evidently, in galaxies with absolute magnitudes Mg in the range fr…
Calibrating Column Density Tracers with Gamma-Ray Observations of the ρ Ophiuchi Molecular Cloud
Teachey, Alex; Abrahams, Ryan D.; Paglione, Timothy A. D.
Diffuse gamma-ray emission from interstellar clouds results largely from cosmic ray (CR) proton collisions with ambient gas, regardless of the gas state, temperature, or dust properties of the cloud. The interstellar medium is predominantly transparent to both CRs and gamma-rays, so GeV emission is a unique probe of the total gas column density. T…
Kinematics of the ionized and molecular gas in nearby luminous infrared interacting galaxies
Borlaff, Alejandro; Rosado, Margarita; Zaragoza-Cardiel, Javier +3 more
We have observed three luminous infrared galaxy systems which are pairs of interacting galaxies, with the Galaxy Hα Fabry-Perot system mounted on the 4.2 m William Herschel Telescope at the Roque de los Muchachos Observatory, and combined the observations with the Atacama Large Millimeter Array observations of these systems in CO emission to compa…
The structural, stratigraphic, and paleoenvironmental record exposed on the rim and walls of Iazu Crater, Mars
Arvidson, R. E.; Murchie, S. L.; Zanetti, M. +2 more
Iazu is a 6.8 km diameter crater located 25 km south of Endeavour Crater in Meridiani Planum, Mars. The asymmetrical ejecta deposit and crater shape demonstrate that Iazu was formed by the impact of a projectile moving from west to east at 20 to 30° above the horizontal. The crater rim and walls expose an 115 m thick section of intact banded brigh…
Long-term Longitudinal Recurrences of the Open Magnetic Flux Density in the Heliosphere
Dósa, M.; Erdős, G.
Open magnetic flux in the heliosphere is determined from the radial component of the magnetic field vector measured onboard interplanetary space probes. Previous Ulysses research has shown remarkable independence of the flux density from heliographic latitude, explained by super-radial expansion of plasma. Here we are investigating whether any lon…
Investigating the behaviour of neutral hydrogen Lyα spectral line width in polar coronal holes at solar minimum
Susino, R.; Antonucci, E.; Spadaro, D. +2 more
We investigate the behaviour of the H I Lyα spectral line widths measured by UVCS/SOHO in polar coronal holes at minimum of solar magnetic activity. The line widths are reported to significantly increase up to 3 R⊙, while above 3 R⊙ there is observational evidence of either nearly constant or slightly decreasing values. We ad…
Nanograin Density Outside Saturn’s A Ring
Persoon, A. M.; Johnson, Robert E.; Tseng, Wei-Ling +1 more
The observed disparity between the radial dependence of the ion and electron densities measured by the Cassini plasma (CAPS) and radio (RPWS) science instruments are used to show that the region between the outer edge of Saturn’s main rings and its tenuous G ring is permeated with small charged grains (nanograins). These grains emanate from the ed…
Temporal relations between magnetic bright points and the solar sunspot cycle
Van Doorsselaere, Tom; Utz, Dominik; Muller, Richard
The Sun shows a global magnetic field cycle traditionally best visible in the photosphere as a changing sunspot cycle featuring roughly an 11-year period. In addition we know that our host star also harbours small-scale magnetic fields often seen as strong concentrations of magnetic flux reaching kG field strengths. These features are situated in …
Exploring accretion disk physics and black hole growth with regular monitoring of ultrafast active galactic nucleus winds
Pounds, K.; Lobban, A.; Nixon, C.
Fifteen years of XMM-Newton observations have established that ultrafast highly ionized winds (UFOs) are common in radio-quiet active galactic nucleus (AGN). A simple theory of Eddington-limited accretion correctly predicts the typical velocity (∼0.1c) and high ionization of such winds, with observed flow energy capable of ejecting star-forming ga…