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A search for periodicities from a ULX in the LINER galaxy NGC 4736
Balman, Solen; Akyuz, Aysun; Avdan, Hasan +1 more
We report our findings on a new quasi-periodic oscillation (QPO) and a long period from the ultraluminous X-ray source (ULX) X-2 in nearby galaxy NGC 4736 based on the Chandra and XMM-Newton archival data. To examine the timing properties, power density spectra of the source have been obtained using Fast Fourier Transform. Also the spectral parame…
Radar investigations of Apollinaris Mons on Mars: Exploring the origin of the fan deposits
El-Maarry, M. R.; Heggy, E.; Dohm, J. M.
Apollinaris Mons is an isolated volcano on Mars straddling the boundary between the southern highlands and the northern plains. One of its most distinctive features is its massive fan-shaped deposit that extends from a breach on its summit to distances of more than 150 km and drapes its entire southern flank. The composition and formation mechanis…
Surface current balance and thermoelectric whistler wings at airless astrophysical bodies: Cassini at Rhea
Khurana, K. K.; Waite, J. H.; Teolis, B. D. +1 more
Sharp magnetic perturbations found by the Cassini spacecraft at the edge of the Rhea flux tube are consistent with field-aligned flux tube currents. The current system results from the difference of ion and electron gyroradii and the requirement to balance currents on the sharp Rhea surface. Differential-type hybrid codes that solve for ion veloci…
The Impact of Coronagraphs
St. Cyr, O. C.; Davila, J. M.; Fleck, B.
Given the grandeur of a total solar eclipse, it is likely that prehistoric humans marveled at the Sun's corona. Artificially rejecting light from the solar disk to see the million times fainter corona is a significant challenge, so it is not surprising that efforts to reproduce an eclipse were not successful until relatively recently.
XMM-Newton and Chandra X-ray follow-up observations of the VHE gamma-ray source HESS J1507-622
Tibolla, O.; Kaufmann, S.; Kosack, K.
Context. The discovery of the unique source HESS J1507-622 in the very high energy (VHE) range (100 GeV-100 TeV) opened new possibilities to study the parent population of ultra-relativistic particles found in astrophysical sources and underlined the possibility of new scenarios/mechanisms crucial for understanding the underlying astrophysical pro…
Two-dimensional spectral estimators of statistical anisotropy and search for the isolated directions in Planck mission data
Verkhodanov, O. V.; Naiden, Ya. V.
We describe a method for the analysis of homogeneity of the microwave background maps based on the behavior of the angular power spectrum C(ℓ) and parity parameter P. The estimator is built using the dispersion variation of the power spectrum of the background signal hemisphere and allows to visualize the statistical anisotropy as a new map which …
Long-Term Vibration Monitoring Onboard Mars Express Mission
Scaccabarozzi, Diego; Saggin, Bortolino; Comolli, Lorenzo
Aspects of magnetosphere-ionosphere coupling in sawtooth substorms: a case study
Farrugia, C. J.; Sandholt, P. E.
In a case study we report on repetitive substorm activity during storm time which was excited during Earth passage of an interplanetary coronal mass ejection (ICME) on 18 August 2003. Applying a combination of magnetosphere and ground observations during a favourable multi-spacecraft configuration in the plasma sheet (GOES-10 at geostationary alti…
Resolving the shocked gas in HH 54 with Herschel. CO line mapping at high spatial and spectral resolution
Olofsson, G.; Liseau, R.; Benedettini, M. +11 more
Context. The HH 54 shock is a Herbig-Haro object, located in the nearby Chamaeleon II cloud. Observed CO line profiles are due to a complex distribution in density, temperature, velocity, and geometry.
Aims: Resolving the HH 54 shock wave in the far-infrared (FIR) cooling lines of CO constrain the kinematics, morphology, and physical conditio…
High-Resolution Optical Spectroscopy of the R Coronae Borealis Star V532 Ophiuchi at Maximum Light
Lambert, David L.; Kameswara Rao, N.; Hema, B. P. +1 more
Not Available
Based on observations obtained with the Harlan J. Smith Telescope of McDonald Observatory of the University of Texas at Austin.