Search Publications
Digging for Relics of the Past: The Ancient and Obscured Bulge Globular Cluster NGC 6256
Dalessandro, E.; Salaris, M.; Saracino, S. +5 more
We used a set of moderately deep and high-resolution optical observations obtained with the Hubble Space Telescope to investigate the properties of the stellar population in the heavily obscured bulge globular cluster (GC) NGC 6256. The analysis of the color-magnitude diagram (CMD) revealed a stellar population with an extended blue horizontal bra…
SOFIA/HAWC+ Traces the Magnetic Fields in NGC 1068
Staguhn, Johannes; Ward-Thompson, Derek; Dowell, C. Darren +22 more
We report the first detection of galactic spiral structure by means of thermal emission from magnetically aligned dust grains. Our 89 µm polarimetric imaging of NGC 1068 with the High-resolution Airborne Wideband Camera/Polarimeter (HAWC+) on NASAs Stratospheric Observatory for Infrared Astronomy (SOFIA) also sheds light on magnetic field st…
The Mean Magnetic Field Strength of CI Tau
Johns-Krull, Christopher M.; Lee, Jae-Joon; Prato, L. +4 more
We present a blind comparison of two methods to measure the mean surface magnetic field strength of the classical T Tauri star CI Tau based on Zeeman broadening of sensitive spectral lines. Our approach takes advantage of the greater Zeeman broadening at near-infrared compared to optical wavelengths. We analyze a high signal-to-noise, high spectra…
TauREx3 PhaseCurve: A 1.5D Model for Phase-curve Description
Changeat, Q.; Al-Refaie, A.
In recent years, retrieval analysis of exoplanet atmospheres have been very successful, providing deep insights on the composition and the temperature structure of these worlds via transit and eclipse methods. Analysis of spectral phase-curve observations, which in theory provide even more information, are still limited to a few planets. In the ne…
Space Velocity and Time Span of Jets in Planetary Nebulae
Guerrero, Martín A.; Ortiz, Roberto; Suzett Rechy-García, Jackeline
Fast highly collimated outflows, including bipolar knots, jetlike features, and point-symmetric filaments or strings of knots, are common in planetary nebulae (PNe). These features, generally known as jets, are thought to play an active role in the nebular shaping immediately before or while fast stellar winds and D-type ionization fronts shock an…
Connecting 3D Evolution of Coronal Mass Ejections to Their Source Regions
Pant, Vaibhav; Banerjee, Dipankar; Patel, Ritesh +1 more
Since coronal mass ejections (CMEs) are the major drivers of space weather, it is crucial to study their evolution starting from the inner corona. In this work we use graduated cylindrical shell model to study the 3D evolution of 59 CMEs in the inner (<3 R⊙) and outer (>3 R⊙) corona using observations from COR-1 and COR…
Deep XMM-Newton Observations Reveal the Origin of Recombining Plasma in the Supernova Remnant W44
Seta, Masumichi; Yamaguchi, Hiroya; Uchida, Hiroyuki +8 more
Recent X-ray studies have revealed overionized recombining plasmas in a dozen mixed-morphology (MM) supernova remnants (SNRs). However, the physical process of the overionization has not yet been fully understood. Here we report on spatially resolved spectroscopy of X-ray emission from W44, one of the overionized MM SNRs, using XMM-Newton data fro…
Star-forming Sites IC 446 and IC 447: An Outcome of End-dominated Collapse of Monoceros R1 Filament
Dewangan, L. K.; Ojha, D. K.; Pirogov, L. E. +1 more
We present an analysis of multiwavelength observations of Monoceros R1 (Mon R1) complex (at d ∼760 pc). An elongated filament (length ∼14 pc, mass ∼1465 M⊙) is investigated in the complex, which is the most prominent structure in the Herschel column density map. An analysis of the FUGIN 12CO(1-0) and 13CO(1-0) line…
CME-induced Thermodynamic Changes in the Corona as Inferred from Fe XI and Fe XIV Emission Observations during the 2017 August 21 Total Solar Eclipse
Druckmüller, Miloslav; Ding, Adalbert; Boe, Benjamin +3 more
We present the first remote sensing observations of the impact from a Coronal Mass Ejection (CME) on the thermodynamic properties of the solar corona between 1 and 3 R⊙. Measurements of the Fe XI (789.2 nm) and Fe XIV (530.3 nm) emission were acquired with identical narrow-bandpass imagers at three observing sites during the 2017 August…
First Observation of a Type II Solar Radio Burst Transitioning between a Stationary and Drifting State
Kontar, Eduard P.; Chrysaphi, Nicolina; Reid, Hamish A. S.
Standing shocks are believed to be responsible for stationary Type II solar radio bursts, whereas drifting Type II bursts are excited by moving shocks often related to coronal mass ejections (CMEs). Observations of either stationary or drifting Type II bursts are common, but a transition between the two states has not yet been reported. Here, we p…