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A Gemini-NIFS view of the merger remnant NGC 34
Pastoriza, M. G.; Storchi-Bergmann, T.; Ricci, T. V. +8 more
The merger remnant NGC 34 is a local luminous infrared galaxy (LIRG) hosting a nuclear starburst and a hard X-ray source associated with a putative, obscured Seyfert 2 nucleus. In this work, we use adaptive optics assisted near-infrared (NIR) integral field unit observations of this galaxy to map the distribution and kinematics of the ionized and …
The sharpest ultraviolet view of the star formation in an extreme environment of the nearest Jellyfish Galaxy IC 3418
Hota, Ananda; Devaraj, Ashish; Pradhan, Ananta C. +11 more
We present the far ultraviolet (FUV) imaging of the nearest Jellyfish or Fireball galaxy IC3418/VCC 1217, in the Virgo cluster of galaxies, using Ultraviolet Imaging Telescope (UVIT) onboard the AstroSat satellite. The young star formation observed here in the 17 kpc long turbulent wake of IC3418, due to ram pressure stripping of cold gas surround…
Solar EUV-Enhancement and Thermospheric Disturbances
Briand, C.; Doerksen, K.; Deleflie, F.
The increase of energetic electromagnetic flux during solar flares and particle precipitation during geomagnetic activity are among the most important sources of neutral density disturbances to the Earth's thermosphere. However, disentangling the role of X and EUV radiation during solar flares is difficult due to the rarity of sufficiently isolate…
Mapping Milky Way Halo Substructure Using Stars in the Extended Blue Tail of the Horizontal Branch
Newberg, Heidi Jo; Gryncewicz, Robert; Martin, Charles +2 more
Although blue horizontal branch (BHB) stars are commonly used to trace halo substructure, the stars bluer than (g - r) < -0.3 are ignored owing to the difficulty in determining their absolute magnitudes. The blue extension of the horizontal branch (HBX) includes BHB tail stars and extreme horizontal branch (EHB) stars. We present a method for i…
A Comparison of Sparse and Non-sparse Techniques for Electric-Field Inversion from Normal-Component Magnetograms
Yeates, Anthony R.; Mackay, Duncan H.
An important element of 3D data-driven simulations of solar magnetic fields is the determination of the horizontal electric field at the solar photosphere. This electric field is used to drive the 3D simulations and inject energy and helicity into the solar corona. One outstanding problem is the localisation of the horizontal electric field such t…
Orbital evolution of the BepiColombo Mercury Planetary Orbiter (MPO) in the gravity field of Mercury
Oberst, Jürgen; Hussmann, Hauke; Stark, Alexander +2 more
We assessed the impact of the uncertainties in the gravity field harmonic coefficients of Mercury on the orbital evolution of the Mercury Planetary Orbiter (MPO), part of the European-Japanese BepiColombo mission. We used in our simulations the most recent estimation of the gravity field model of Mercury determined from radio tracking data of the …
Radio Proper Motions of the Energetic Pulsar PSR J1813-1749
Rodríguez, Luis F.; Dzib, Sergio A.
PSR J1813-1749 has peculiarities that make it a very interesting object of study. It is one of the most energetic and the most scattered pulsars known. It is associated with HESS J1813-178, one of the brightest and most compact TeV sources in the sky. Recently, Ho et al. used archival X-ray Chandra observations separated by more than 10 yr and det…
New insights into the WR nebula M1-67 with SITELLE
Drissen, Laurent; St-Louis, Nicole; Sévigny, Marcel +1 more
We present a detailed study of M1-67, a well-known nebula around the population I Wolf-Rayet star WR 124 (WNh 8), based on datacubes obtained with the imaging Fourier transform spectrometer SITELLE at the Canada-France-Hawaii Telescope. This allowed us to reconstruct detailed emission-line ratio maps that highlight clear orthogonal features from a…
The Robustness of Synthetic Observations in Producing Observed Core Properties: Predictions for the TolTEC Clouds to Cores Legacy Survey
Wilson, G.; Gutermuth, R.; Pokhrel, R. +3 more
We use hydrodynamical simulations of star-forming gas with stellar feedback and sink particles-proxies for young stellar objects (YSOs)-to produce and analyze synthetic 1.1 mm continuum observations at different distances (150-1000 pc) and ages (0.49-1.27 Myr). We characterize how the inferred core properties, including mass, size, and clustering …
Solar Wind—Magnetosphere Coupling During Radial Interplanetary Magnetic Field Conditions: Simultaneous Multi-Point Observations
Escoubet, C. P.; Lavraud, B.; Fear, R. C. +12 more
In-situ spacecraft missions are powerful assets to study processes that occur in space plasmas. One of their main limitations, however, is extrapolating such local measurements to the global scales of the system. To overcome this problem at least partially, multi-point measurements can be used. There are several multi-spacecraft missions currently…