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Oscillatory Response of the Solar Chromosphere to a Strong Downflow Event above a Sunspot
Chae, Jongchul; Song, Donguk; Madjarska, Maria S. +3 more
We report three-minute oscillations in the solar chromosphere driven by a strong downflow event in a sunspot. We used the Fast Imaging Solar Spectrograph of the 1.6 m New Solar Telescope and the Interface Region Imaging Spectrograph (IRIS). The strong downflow event is identified in the chromospheric and transition region lines above the sunspot u…
Disc colours in field and cluster spiral galaxies at 0.5 ≲z ≲ 0.8
Aragón-Salamanca, Alfonso; Zaritsky, Dennis; Jablonka, Pascale +9 more
We present a detailed study of the colours of late-type galaxy discs for ten of the EDisCS galaxy clusters with 0.5 ≲ z ≲ 0.8. Our cluster sample contains 172 spiral galaxies, and our control sample is composed of 96 field disc galaxies. We deconvolved their ground-based V and I images obtained with FORS2 at the VLT with initial spatial resolution…
High-resolution mapping of dust via extinction in the M31 bulge
Lauer, Tod R.; Wang, Q. D.; Dalcanton, Julianne J. +5 more
We map the dust distribution in the central 180 arcsec (∼680 pc) region of the M31 bulge, based on HST WFC3 and ACS observations in ten bands from near-ultraviolet (2700 Å) to near-infrared (1.5 µm). This large wavelength coverage gives us great leverage to detect not only dense dusty clumps, but also diffuse dusty molecular gas. We fit a pi…
A multi-scale magnetotail reconnection event at Saturn and associated flows: Cassini/UVIS observations
Jackman, C. M.; Mitchell, D. G.; Jia, X. +6 more
We present high-resolution Cassini/UVIS (Ultraviolet Imaging Spectrograph) observations of Saturn's aurora during May 2013 (DOY 140-141). The observations reveal an enhanced auroral activity in the midnight-dawn quadrant in an extended local time sector (∼02 to 05 LT), which rotates with an average velocity of ∼45% of rigid corotation. The auroral…
Gaia reference frame amid quasar variability and proper motion patterns in the data
Lindegren, L.; Hobbs, D.; Bachchan, R. K.
Context. Gaia's very accurate astrometric measurements will allow the optical realisation of the International Celestial Reference System to be improved by a few orders of magnitude. Several sets of quasars are used to define a kinematically stable non-rotating reference frame with the barycentre of the solar system as its origin. Gaia will also o…
Interrupted Eruption of Large Quiescent Filament Associated with a Halo CME
Filippov, Boris; Chandra, Ramesh; Gosain, S. +1 more
We analyze the observations of an eruptive quiescent filament associated with a halo Coronal Mass Ejection (CME). We use observations from the Atmospheric Imaging Assembly (AIA) instrument onboard the Solar Dynamics Observatory (SDO), Solar and Heliospheric Observatory (SOHO)/Large Angle and Spectrometric Coronagraph (LASCO), and the Solar Terrest…
The Stellar Mass Fundamental Plane and Compact Quiescent Galaxies at z < 0.6
Hwang, Ho Seong; Geller, Margaret J.; Damjanov, Ivana +2 more
We examine the evolution of the relation between stellar mass surface density, velocity dispersion, and half-light radius—the stellar mass fundamental plane (MFP)—for quiescent galaxies at z < 0.6. We measure the local relation from galaxies in the Sloan Digital Sky Survey and the intermediate redshift relation from ∼500 quiescent galaxies with…
The structure and evolution of a forming galaxy cluster at z = 1.62
Hartley, W. G.; Conselice, C. J.; Almaini, O. +4 more
We present a comprehensive picture of the Cl 0218.3-0510 protocluster at z = 1.623 across 10 comoving Mpc. Using filters that tightly bracket the Balmer and 4000 Å breaks of the protocluster galaxies we obtain precise photometric redshifts resulting in a protocluster galaxy sample that is 89 ± 5 per cent complete and has a contamination of only 12…
The radial speed-expansion speed relation for Earth-directed CMEs
Gopalswamy, N.; Yashiro, S.; Mäkelä, P.
Earth-directed coronal mass ejections (CMEs) are the main drivers of major geomagnetic storms. Therefore, a good estimate of the disturbance arrival time at Earth is required for space weather predictions. The STEREO and SOHO spacecraft were viewing the Sun in near quadrature during January 2010 to September 2012, providing a unique opportunity to…
The XXL Survey. XII. Optical spectroscopy of X-ray-selected clusters and the frequency of AGN in superclusters
Altieri, B.; Valtchanov, I.; Pierre, M. +13 more
Context. This article belongs to the first series of XXL publications. It presents multifibre spectroscopic observations of three 0.55 deg2 fields in the XXL Survey, which were selected on the basis of their high density of X-ray-detected clusters. The observations were obtained with the AutoFib2+WYFFOS (AF2) wide-field fibre spectrogra…