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A weak lensing comparability study of galaxy mergers that host AGNs.
Courbin, F.; Harvey, D.
We compared the total mass density profiles of three different types of galaxies using weak gravitational lensing: (i) 29 galaxies that host quasars at bar{z}∼ 0.32 that are in a post-starburst quasar (PSQ) phase with high star formation indicating recent merger activity, (ii) 22 large elliptical galaxies from the Sloan Lens ACS Survey (SLACS) sam…
Archival Legacy Investigations of Circumstellar Environments (ALICE): Statistical assessment of point source detections
Perrin, Marshall D.; Pueyo, Laurent; Choquet, Élodie +5 more
The ALICE program, for Archival Legacy Investigation of Circumstellar Environment, is currently conducting a virtual survey of about 400 stars, by re-analyzing the HST-NICMOS coronagraphic archive with advanced post-processing techniques. We present here the strategy that we adopted to identify detections and potential candidates for follow-up obs…
Anisotropy-Guided Enantiomeric Enhancement in AlanineUsing Far-UV Circularly Polarized Light
Meinert, Cornelia; Cassam-Chenaï, Patrick; Jones, Nykola C. +3 more
All life on Earth is characterized by its asymmetry - both the genetic material and proteins are composed of homochiral monomers. Understanding how this molecular asymmetry initially arose is a key question related to the origins of life. Cometary ice simulations, l-enantiomeric enriched amino acids in meteorites and the detection of circularly po…
XMM-Newton Measurement of the Galactic Halo X-Ray Emission using a Compact Shadowing Cloud
Henley, David B.; Shelton, Robin L.; Stancil, Phillip C. +1 more
Observations of interstellar clouds that cast shadows in the soft X-ray background can be used to separate the background Galactic halo emission from the local emission due to solar wind charge exchange (SWCX) and/or the Local Bubble (LB). We present an XMM-Newton observation of a shadowing cloud, G225.60-66.40, that is sufficiently compact that t…
A complete radio study of SNR G15.4+0.1 from new GMRT observations
Surnis, M. P.; Castelletti, G.; Supan, L. +2 more
Aims: The supernova remnant (SNR) G15.4+0.1 is considered to be the possible counterpart of the γ-ray source HESS J1818-154. With the goal of getting a complete view of this remnant and understanding the nature of the γ-ray flux, we conducted a detailed radio study that includes the search for pulsations and a model of the broadband emission …
The Relationship Between Solar Coronal X-Ray Brightness and Active Region Magnetic Fields: A Study Using High-Resolution Hinode Observations
Hazra, Soumitra; Nandy, Dibyendu; Ravindra, B.
By using high-resolution observations of nearly co-temporal and co-spatial Solar Optical Telescope spectropolarimeter and X-Ray Telescope coronal X-ray data onboard Hinode, we revisit the problematic relationship between global magnetic quantities and coronal X-ray brightness. Co-aligned vector magnetogram and X-ray data were used for this study. …
Current-driven Langmuir oscillations and amplitude modulations—Another view on electron beam-plasma interaction
Sauer, K.; Sydora, R. D.
origin of Langmuir amplitude modulations and harmonic waves observed in the solar wind and in planetary foreshock regions is investigated in beam plasmas where the saturation process of the beam instability is accompanied with the formation of a plateau distribution. This saturated state represents a current which is shown to drive homogeneous ele…
The dayside magnetopause location during radial interplanetary magnetic field periods: Cluster observation and model comparison
Wang, H.; Shue, J. -H.; Huang, T. +2 more
The present work has investigated the midlatitudinal magnetopause locations under radial interplanetary field (RIMF) conditions. Among 262 (256) earthward (sunward) RIMF events from years of 2001 to 2009, Cluster satellites have crossed the magnetopause 22(12) times, with 10 (7) events occurring at midlatitudes. The observed midlatitudinal magneto…
MLS110213:022733+130617: a new eclipsing polar above the period gap
Costa, J. E. R.; Oliveira, A. S.; Rodrigues, C. V. +4 more
This study confirms MLS110213:022733+130617 as a new eclipsing polar. We performed optical spectroscopic, polarimetric and photometric follow-up of this variable source identified by the Catalina Real Time Transient Survey. Using the mid-eclipse times, we estimated an orbital period of 3.787 h, which is above the orbital period gap of the cataclys…
A statistical study of the low-altitude ionospheric magnetic fields over the north pole of Venus
Luhmann, J. G.; Russell, C. T.; Zhang, T. L. +3 more
Examination of Venus Express (VEX) low-altitude ionospheric magnetic field measurements during solar minimum has revealed the presence of strong magnetic fields at low altitudes over the north pole of Venus. A total of 77 events with strong magnetic fields as VEX crossed the northern polar region were identified between July 2008 and October 2009.…