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Probing Asymmetric Structures in the Outskirts of Galaxies
Zheng, Xian Zhong; Wen, Zhang Zheng; An, Fang Xia
Upcoming large imaging surveys will allow detailed studies of the structure and morphology of galaxies aimed at addressing how galaxies form and evolve. Computational approaches are needed to characterize their morphologies over large samples. We introduce an automatic method to quantify the outer structure of galaxies. The key to our approach is …
A blowout numerical model for the supernova remnant G352.7-0.1
Velázquez, P. F.; Esquivel, A.; Giacani, E. +1 more
We present 3D hydrodynamical simulations of the Galactic supernova remnant G352.7-0.1. This remnant is peculiar for having a shell-like inner ring structure and an outer arc in radio observations. In our model, the supernova explosion producing the remnant occurs inside and near the border of a spherical cloud with a density higher than that of th…
Multi-frequency Observations of a Superbubble in the LMC: The Case of LHA 120-N 70
Haberl, F.; Filipović, M. D.; Maggi, P. +8 more
We present a detailed study of new Australia Telescope Compact Array and XMM-Newton observations of LHA 120-N 70 (hereafter N 70), a spherically shaped object in the Large Magellanic Cloud, classified as a superbubble. Both archival and new observations were used to produce high quality radio continuum, X-ray, and optical images. The radio spectra…
The spectroscopic evolution of the recurrent nova T Pyxidis during its 2011 outburst. III. The ultraviolet development from iron curtain through the post-X-ray turnoff
Sion, E. M.; Shore, S. N.; Mason, E. +3 more
We continue the analysis of the multiwavelength evolution of the recurrent nova T Pyx during its 2011 outburst, focussing on the spectral development on the 1150-3000 Å region. This extraordinary data set presents the longest temporal baseline high resolution view of the ultraviolet for any nova to date (classical or recurrent). The observations c…
Transmission and conversion of magnetoacoustic waves on the magnetic canopy in a quiet Sun region
Tziotziou, K.; Tsiropoula, G.; Kontogiannis, I.
Context. We present evidence for the conversion and transmission of wave modes on the magnetic flux tubes that constitute mottles and form the magnetic canopy in a quiet Sun region.
Aims: Our aim is to highlight the details and the key parameters of the mechanism that produces power halos and magnetic shadows around the magnetic network obser…
A 33 Yr Constancy of the X-Ray Coronae of AR Lac and Eclipse Diagnosis of Scale Height
Drake, Jeremy J.; Huenemoerder, David P.; Ratzlaff, Peter +3 more
Extensive X-ray and EUV photometric observations of the eclipsing RS CVn system AR Lac were obtained over the years 1997-2013 with the Chandra X-Ray Observatory Extreme-Ultraviolet Explorer (EUVE). During primary eclipse, High Resolution Camera count rates decrease by ~40%. A similar minimum is seen during one primary eclipse observed by EUVE but …
Ionized gas discs in elliptical and S0 galaxies at z < 1
Aragón-Salamanca, Alfonso; Zaritsky, Dennis; Kuntschner, Harald +7 more
We analyse the extended, ionized-gas emission of 24 early-type galaxies (ETGs) at 0 < z < 1 from the ESO Distant Cluster Survey (EDisCS). We discuss different possible sources of ionization and favour star formation as the main cause of the observed emission. 10 galaxies have disturbed gas kinematics, while 14 have rotating gas discs. In add…
Bright Debris Disk Candidates Detected with the AKARI/Far-infrared Surveyor
Jiang, Peng; Wang, Tinggui; Liu, Qiong
We cross-correlate the Hipparcos main-sequence star catalog with the AKARI/FIS catalog and identify 136 stars (at >90% reliability) with far-infrared detections in at least one band. After rejecting 57 stars classified as young stellar objects, Be stars and other type stars with known dust disks or with potential contaminations, and 4 stars wit…
Accretion-Inhibited Star Formation in the Warm Molecular Disk of the Green-valley Elliptical Galaxy NGC 3226?
Duc, P. -A.; Armus, L.; Appleton, P. N. +7 more
We present archival Spitzer photometry and spectroscopy and Herschel photometry of the peculiar "Green Valley" elliptical galaxy NGC 3226. The galaxy, which contains a low-luminosity active galactic nucleus (AGN), forms a pair with NGC 3227 and is shown to lie in a complex web of stellar and H I filaments. Imaging at 8 and 16 µm reveals a cu…
A model of the spatial and size distribution of Enceladus' dust plume
Kriegel, Hendrik; Motschmann, Uwe; Schmidt, Jürgen +5 more
The structure of Enceladus' south polar plume of charged dust is studied by simulations of the dust grain dynamics. The model considers the Lorentz force and charging of the grains by the plasma environment within the plume. Simulated dust plumes are investigated by applying 10 selected sets of dust parameters that include variations of the grain …