Search Publications
Nonthermal X-Rays from Supernova Remnant G330.2+1.0 and the Characteristics of its Central Compact Object
Pavlov, George G.; Kargaltsev, Oleg; Hughes, John P. +5 more
We present results from our X-ray data analysis of the supernova remnant (SNR) G330.2+1.0 and its central compact object (CCO), CXOU J160103.1-513353 (J1601 hereafter). Using our XMM-Newton and Chandra observations, we find that the X-ray spectrum of J1601 can be described by neutron star atmosphere models (T ∞ ~ 2.5-5.5 MK). Assuming t…
A Chandra View of NGC 3621: A Bulgeless Galaxy Hosting an AGN in Its Early Phase?
Eracleous, Michael; Satyapal, Shobita; Gliozzi, Mario +2 more
We report the detection of a weak X-ray point-source coincident with the nucleus of the bulgeless disk galaxy NGC 3621, recently discovered by Spitzer to display high-ionization mid-infrared lines typically associated with active galactic nucleus (AGN). These Chandra observations provide confirmation for the presence of an AGN in this galaxy, addi…
Chandra and XMM Observations of the Composite Supernova Remnant G327.1-1.1
Temim, Tea; Hughes, John P.; Slane, Patrick +2 more
We present new X-ray imaging and spectroscopy of a composite supernova remnant G327.1-1.1 using the Chandra and XMM-Newton X-ray observatories. G327.1-1.1 has an unusual morphology consisting of a symmetric radio shell and an off center nonthermal component that indicates the presence of a pulsar wind nebula (PWN). Radio observations show a narrow…
The optical counterparts of accreting millisecond X-ray pulsars during quiescence
Covino, S.; D'Avanzo, P.; Campana, S. +3 more
Context: Eight accreting millisecond X-ray pulsars (AMXPs) are known to date. Although these systems are well studied at high energies, very little information is available for their optical/NIR counterparts. Up to now, only two of them, SAX J1808.4-3658 and IGR J00291+5934, have a secure multi-band detection of their optical counterparts in quies…
Cool Subdwarf Investigations. II. Multiplicity
Henry, Todd J.; Mason, Brian D.; Jao, Wei-Chun +2 more
Cool subdwarfs of types K and M are the fainter counterparts of cool main-sequence dwarfs that dominate the Galactic population. In this paper, we present the results of an optical speckle survey of 62 confirmed cool subdwarf systems within 60 pc. We have resolved two new companions and confirmed two previously known companions with separations 0f…
Cloud features and zonal wind measurements of Saturn's atmosphere as observed by Cassini/VIMS
Brown, R. H.; Showman, A. P.; Choi, D. S.
We present an analysis of data about Saturn's atmosphere from Cassini's Visual and Infrared Mapping Spectrometer (VIMS), focusing on the meteorology of the features seen in the 5 µm spectral window. We present VIMS mosaics and discuss the morphology and general characteristics of the features backlit by Saturn's thermal emission. We have als…
The Solar Wind Charge-eXchange Contribution to the Local Soft X-ray Background. Model to Data Comparison in the 0.1-1.0 keV Band
Lallement, Rosine; Koutroumpa, Dimitra; Kharchenko, Vasili +1 more
The major sources of the Soft X-ray Background (SXRB), besides distinct structures as supernovae and superbubbles (e.g. Loop I), are: (i) an absorbed extragalactic emission following a power law, (ii) an absorbed thermal component (∼2×106 K) from the galactic disk and halo, (iii) an unabsorbed thermal component, supposedly at 106
Rain and dewdrops on titan based on in situ imaging
Karkoschka, Erich; Tomasko, Martin G.
The Descent Imager/Spectral Radiometer (DISR) of the Huygens probe was in an excellent position to view aspects of rain as it descended through Titan's atmosphere. Rain may play an important part of the methane cycle on Titan, similar to the water cycle on Earth, but rain has only been indirectly inferred in previous studies. DISR detected two dar…
Evidence for the Missing Baryons in the Angular Correlation of the Diffuse X-Ray Background
Gupta, A.; Galeazzi, M.; Ursino, E.
The amount of detected baryons in the local universe is at least a factor of 2 smaller than that measured at high redshift. It is believed that a significant fraction of the baryons in the current universe is "hiding" in a hot filamentary structure filling the intergalactic space, the warm-hot intergalactic medium (WHIM). We found evidence of the …
Analysis of three-spacecraft data using planar reciprocal vectors: methodological framework and spatial gradient estimation
Marghitu, O.; Albert, A.; Vogt, J.
In the context of ESA's Cluster mission, four-point array techniques are widely used to analyze space plasma phenomena such as shocks and discontinuities, waves and turbulence, and spatial gradients. Due to failures of single instruments on the Cluster spacecraft fleet, there is also need for array processing of three-point measurements. In this p…