Search Publications
High Energy Studies on the Non-Thermal Emissions from Cassiopeia A & Tycho
Hudaverdi, Murat; Bozkurt, Mustafa; Ergin, Tulun +1 more
Instrumental and Observational Artifacts in Quiet Sun Magnetic Flux Cancellation Functions
Pietarila, A.; Pietarila Graham, J.
Under the assumption that the photospheric quiet Sun magnetic field is turbulent, the cancellation function has previously been used to estimate the true, resolution-independent mean, unsigned vertical flux «|Bz|»true. We show that the presence of network elements, noise, and seeing complicate the measurement of accurate canc…
Laser ablation in a running hall effect thruster for space propulsion
Balika, L.; Focsa, C.; Gurlui, S. +4 more
Hall Effect Thrusters (HETs) are promising electric propulsion devices for the station-keeping of geostationary satellites (more than 120 in orbit to date). Moreover, they can offer a cost-effective solution for interplanetary journey, as proved by the recent ESA SMART-1 mission to the Moon. The main limiting factor of the HETs lifetime is the ero…
Detection and characterisation of the first Planck high-z candidates
Flores-Cacho, I.
With its unprecedented ability to scrutinise the sub-millimetre (sub-mm) to centimetre full sky, the Planck satellite is uniquely suited to search for the progenitors of clusters of galaxies. The forming massive halos at z ≳1-2 are expected to host massive galaxies with high star formation rates. Clustered in the growing potential well that is bei…
Preliminary results of the spectral analysis of Suzaku data of SW Ursae Majoris and BZ Ursae Majoris
Gök, F.; İkis Gün, G.; Karagül, A.
Herein, we present the preliminary results of the spectral analysis of the Suzaku data of SW Ursae Majoris (SW UMa) and BZ Ursae Majoris (BZ UMa) which were obtained in their quiescent states. The aim of this study was to analyse 0.5-6.0 keV energy range X-ray photons of the Suzaku satellite and to determine their emission mechanisms and the areas…
WBVR Standards in the Northern Sky. Analysis of Variability Using MZ Technique
Kroussanova, N. L.; Mironov, A. V.; Zakharov, A. I.
From our comparison of magnitudes of bright stars in the Hipparcos catalogue and in the Tien-Shan catalogue of WBVR magnitudes, we compiled a list of stars that could be candidate photometric standards in the northern sky. The selected stars were tested for variability using the MZ technique. The result is a list of 6484 stars recommended as stand…
Additional Newly Identified Star Clusters in M31
Krienke, O. Karl; Hodge, Paul W.
Using the HST archives, we have searched portions of the southern half and northwest quarter of the Andromeda Galaxy (M 31, NGC 224) for previously unrecognized star clusters. The result is a table of the characteristics of 71 newly identified star clusters. Most are moderately faint, low-mass clusters. Absolute magnitudes range from M(V) = -6.3 t…
Magnetic field topology of the plasma sheet boundary layer
Nakamura, R.; Baumjohann, W.; Teh, W. -L.
magnetic field topology of the plasma sheet boundary layer (PSBL) and its neighborhood is examined using a steady, two-dimensional (2-D), ideal MHD reconstruction method. We study four PSBL crossings, from the lobe toward the plasma sheet and back into the lobe, by the Cluster spacecraft in the Earth's magnetotail around (x, y, z) = (-17.3, 4.3, -…
X-ray and optical substructures of the DAFT/FADA survey clusters
Adami, C.; Durret, F.; Lima Neto, G. B. +1 more
We have undertaken the DAFT/FADA survey with the double aim of setting constraints on dark energy based on weak lensing tomography and of obtaining homogeneous and high quality data for a sample of 91 massive clusters in the redshift range 0.4-0.9 for which there were HST archive data. We have analysed the XMM-Newton data available for 42 of these…
Missing Lensed Images and the Galaxy Disk Mass in CXOCY J220132.8-320144
Schechter, Paul L.; Maza, José; Chen, Jacqueline +2 more
The CXOCY J220132.8-320144 system consists of an edge-on spiral galaxy lensing a background quasar into two bright images. Previous efforts to constrain the mass distribution in the galaxy have suggested that at least one additional image must be present. These extra images may be hidden behind the disk which features a prominent dust lane. We pre…