Search Publications
Physical characterization of S169: a prototypical IR bubble associated with the massive star-forming region IRAS 12326-6245
Reynoso, E. M.; Cichowolski, S.; Bronfman, L. +5 more
Aims: With the aim of studying the physical properties of Galactic IR bubbles and to explore their impact in massive star formation, we present a study of the IR bubble S169, associated with the massive star forming region IRAS 12326-6245.
Methods: We used CO (2-1),13CO (2-1), C18O (2-1), HCN (3-2), and HCO+
Caldera Collapse and Volcanic Resurfacing in Arabia Terra Provide Hints of Vast Under-Recognized Early Martian Volcanism
Michalski, Joseph R.; Wright, Shawn P.; Chu, Yin Yau Yoyo +1 more
Arabia Terra is an ancient, geologically complex region of Mars. It is not typically described as volcanic because it lacks prominent, easily recognizable shield volcanoes. However, Arabia Terra contains flood lavas and widespread layered materials that might represent airfall pyroclastics from unknown sources. Here we explore the geology of some …
Variable X-Ray Emission of Comet 46P/Wirtanen
Bodewits, Dennis; Christian, Damian J.; Koutroumpa, Dimitra +3 more
In this paper, we present an analysis of X-ray and optical/ultraviolet (UV) data from the favorable (Δ ~ 0.077 au) 2018 apparition of comet 46P/Wirtanen. The comet was observed during three different epochs (before, during, and after perihelion) over a 1.5 month period using the X-Ray Telescope (XRT) and Ultraviolet and Optical Telescope (UVOT) in…
A source of gamma rays coincident with the shell of the supernova remnant CTB 80
Araya, M.; Herrera, C.
CTB 80 (G69.0+2.7) is a relatively old (50-80 kyr) supernova remnant (SNR) with a complex radio morphology showing three extended radio arms and a radio and X-ray nebula near the location of the pulsar PSR B1951+32. We report on a study of the GeV emission in the region of CTB 80 with Fermi-Large Area Telescope data. An extended source with a size…
Modeling of observations of the OH nightglow in the Venusian mesosphere
Bougher, S. W.; Parkinson, C. D.; Yung, Y. L. +4 more
Venus airglow emissions have been unambiguously detected in the wavelength ranges of 1.40-1.49 and 2.6-3.14 µm in limb observations by the Visible and Infrared Thermal Imaging Spectrometer (VIRTIS) onboard the Venus Express (VEx) spacecraft and are attributed to the OH(2-0) and OH(1-0) Meinel band transitions. The integrated (limb slant path…
The cold dust content of the nearby galaxies IC 5325, NGC 7496, NGC 7590, and NGC 7599
Crawford, T. M.; Vieira, J. D.; Ashby, M. L. N. +6 more
Star-forming galaxies are rich reservoirs of dust, both warm and cold. But the cold dust emission is faint alongside the relatively bright and ubiquitous warm dust emission. Recently, evidence for a very cold dust (VCD) component has also been revealed via millimetre/submillimetre (mm/sub-mm) photometry of some galaxies. This component, despite be…
Spatial Variation in Temperature and Density in the IC 63 PDR from H2 Spectroscopy
Karoly, Janik; Soam, Archana; Andersson, B. -G. +2 more
We have measured the gas temperature in the IC 63 photodissociation region (PDR) using the S(1) and S(5) pure rotation lines of molecular hydrogen with SOFIA/EXES. We divide the PDR into three regions for analysis based on the illumination from γ Cas: sunny, ridge, and shady. Constructing rotation diagrams for the different regions, we obtain temp…
Processes in the Current Disruption Region: From Turbulence to Dispersion Relation
Daly, P. W.; Lui, A. T. Y.; Kronberg, E. A. +2 more
Using measurements from Cluster II space mission, we compared the characteristics of the fluctuations of the magnetic field magnitude and the Bz component in the current disruption (CD) regions. We used fast Fourier transform, statistical, and wavelet analysis, and wave surveyor technique on the multispacecraft measurements. Among the obtained res…
Constraining Soft and Hard X-Ray Irradiation in Ultraluminous X-Ray Sources
Feng, Hua; Qiu, Yanli
Most ultraluminous X-ray sources (ULXs) are argued to be powered by supercritical accretion onto compact objects. One of the key questions regarding these objects is whether or not the hard X-rays are geometrically beamed toward the symmetric axis. We propose testing the scenario using disk irradiation to see how much the outer accretion disk sees…
The flare-activity of 2MASS J16111534-1757214 in the upper Scorpius association
Guenther, E. W.; Chaturvedi, P.; Muheki, P. +3 more
Flares are known to play an important role for the evolution of the atmospheres of young planets. In order to understand the evolution of planets, it is thus important to study the flare-activity of young stars. This is particularly the case for young M‑stars, because they are very active. We study photometrically and spectroscopically the highly …