Search Publications
C+ distribution around S 1 in ρ Ophiuchi
Güsten, R.; Mookerjea, B.; Sandell, G. +2 more
We analyze a [C II] 158 µm map obtained with the L2 GREAT receiver on SOFIA of the reflection nebula illuminated by the early B star S 1 in the ρ Oph A cloud core. This data set has been complemented with maps of CO(3-2), 13CO(3-2), and C18O(3-2), observed as a part of the James Clerk Maxwell Telescope (JCMT) Gould Belt…
Infrared and X-ray study of the Galactic SNR G15.9+0.2
Klochkov, Dmitry; Sasaki, Manami; Santangelo, Andrea +2 more
G15.9+0.2 is a Galactic shell-type supernova remnant (SNR), which was detected in radio and has been confirmed in X-rays based on Chandra observations. An X-ray point source CXOUJ181852.0-150213 has been detected and suggested to be an associated neutron star. In a recent study, we have confirmed the source to be a central compact object (CCO). We…
On the Full-range β Dependence of Ion-scale Spectral Break in the Solar Wind Turbulence
He, Jiansen; Wang, Xin; Wang, Linghua +1 more
The power spectrum of magnetic fluctuations has a break at the high-frequency end of the inertial range. Beyond this break, the spectrum becomes steeper than the Kolmogorov law f -5/3. The break frequency was found to be associated with plasma beta (β). However, the full-range β dependence of the ion-scale spectral break has not been pr…
Investigations of the Mars Upper Atmosphere with ExoMars Trace Gas Orbiter
Montmessin, Franck; Clancy, R. T.; Korablev, Oleg +22 more
The Martian mesosphere and thermosphere, the region above about 60 km, is not the primary target of the ExoMars 2016 mission but its Trace Gas Orbiter (TGO) can explore it and address many interesting issues, either in-situ during the aerobraking period or remotely during the regular mission. In the aerobraking phase TGO peeks into thermospheric d…
FBQS J1644+2619: multiwavelength properties and its place in the class of γ-ray emitting Narrow Line Seyfert 1s
Larsson, J.; Piconcelli, E.; Falocco, S. +4 more
A small fraction of Narrow Line Seyfert 1s (NLSy1s) are observed to be γ-ray emitters. Understanding the properties of these sources is of interest since the majority of NLSy1s are very different from typical blazars. Here, we present a multifrequency analysis of FBQS J1644+2619, one of the most recently discovered γ-ray emitting NLSy1s. We analys…
Spectroscopic Orbits of Subsystems in Multiple Stars. IV. Double-lined Pairs
Tokovinin, Andrei
Spectroscopic orbits are computed for inner pairs in nine hierarchical multiple systems (HIP 19639, 60845, 75663, 76816, 78163, 78416, 80448, 84789, and HD 105080) and for one simple binary HIP 61840. All subsystems are double-lined, and their periods range from 2.27 to 30.4 days. Five spectroscopic binaries are twins with equal masses. Each hiera…
A Radio Frequency Study of the Accreting Millisecond X-ray Pulsar, IGR J16597-3704, in the Globular Cluster NGC 6256
Maccarone, T. J.; Altamirano, D.; Degenaar, N. +14 more
We present Karl G. Jansky Very Large Array radio frequency observations of the new accreting millisecond X-ray pulsar (AMXP), IGR J16597-3704, located in the globular cluster NGC 6256. With these data, we detect a radio counterpart to IGR J16597-3704, and determine an improved source position. Pairing our radio observations with quasi-simultaneous…
The Response of the Venusian Plasma Environment to the Passage of an ICME: Hybrid Simulation Results and Venus Express Observations
Coates, A. J.; Kallio, E.; Futaana, Y. +6 more
Owing to the heritage of previous missions such as the Pioneer Venus Orbiter and Venus Express, the typical global plasma environment of Venus is relatively well understood. On the other hand, this is not true for more extreme driving conditions such as during passages of interplanetary coronal mass ejections (ICMEs). One of the outstanding questi…
The simplest way to get a cluster’s parameters in the Gaia era (Dolidze 41)
Tadross, Ashraf Latif
The astro-photometric parameters of the open star cluster Dolidze 41, which is located in the constellation Cygnus, have been investigated using the Gaia DR2 large survey that is merged with the near infrared Two Micron All Sky Survey (2MASS) database. The radial density distribution (limited, core and tidal radii), color-magnitude diagrams, galac…
High-resolution SOFIA/EXES Spectroscopy of SO2 Gas in the Massive Young Stellar Object MonR2 IRS3: Implications for the Sulfur Budget
Montiel, Edward; Neufeld, David A.; Blake, Geoffrey A. +10 more
Sulfur has been observed to be severely depleted in dense clouds leading to uncertainty in the molecules that contain it and the chemistry behind their evolution. Here, we aim to shed light on the sulfur chemistry in young stellar objects (YSOs) by using high-resolution infrared spectroscopy of absorption by the ν 3 rovibrational band o…