Search Publications
Comet 67P/Churyumov-Gerasimenko and Cometary Biology
Wickramasinghe, Chandra
The long-awaited rendezvous of ROSETTA with its target Comet 67P/Churyumov-Gerasimenko is expected at best to give indirect evidence for cometary panspermia and the presence of microorganisms in comets. Prodigious out gasing of water vapour observed at large heliocentric distances, low albedo and a terrain of alternating rough and smooth areas alr…
Long-term X-ray timing of the double pulsar PSR J0737-3039
Pellizzoni, A.; Egron, E.; Iacolina , M. N.
The relativistic double neutron star binary PSR
Unveiling the nature of an X-ray flare from 3XMM* J014528.9+610729: a candidate spiral galaxy
Pandey, J. C.; Bhatt, Himali; Bhattacharyya, Subir +1 more
We report an X-ray flare from 3XMM J014528.9+610729, serendipitously detected during the observation of the open star cluster NGC 663. The colour-colour space technique using optical and infrared data reveals the X-ray source as a candidate spiral galaxy. The flare shows fast rise and exponential decay shape with a ratio of the peak and the quiesc…
Method of ignoring the systematic variations of stellar parallaxes over the celestial sphere in a kinematic analysis of stellar proper motions
Tsvetkov, A. S.; Vityazev, V. V.
A method for determining the velocity field parameters free from the distortions due to the systematic variations of stellar parallaxes over the celestial sphere is proposed. The method is based on the approximation of parallaxes as a function of coordinates on the sphere using spherical harmonics and can be applied in those cases where the solar …
Old stellar systems in UV: resolved and integrated properties
Dalessandro, E.
The UV properties of old stellar populations have been subject of intense scrutiny from the late sixties, when the UV-upturn in early type galaxies was first discovered. Because of their proximity and relative simplicity, Galactic globular clusters (GGCs) are ideal local templates to understand how the integrated UV light is driven by hot stellar …
Chandra and XMM–Newton Observations of H2O Maser Galaxy Mrk 348
Wang, J.; Zhang, J. S.; Guo, Q.
For H 2O megamaser galaxy Mrk 348, Chandra and XMM–Newton data are analysed. The nuclear fitting results of XMM–Newton data suggest the possible existence of a heavily obscured AGN. But the nuclear spectrum extracted from Chandra cannot be well fitted by the best fitting model for XMM–Newton. Further optimal fitting and discussions are …
Determination of Reference Catalogs for Meridian Observations Using Statistical Method
Li, Z. Y.
The meridian observational data are useful for developing high-precision planetary ephemerides of the solar system. These historical data are provided by the jet propulsion laboratory (JPL) or the Institut De Mecanique Celeste Et De Calcul Des Ephemerides (IMCCE). However, we find that the reference systems (realized by the fundamental catalogs FK…
Correction to "Oxygen and hydrogen ion abundance in the near-Earth magnetosphere: Statistical results on the response to the geomagnetic and solar wind activity conditions"
Fränz, M.; Dandouras, I.; Daly, P. W. +4 more
Are Boltzmann plots of hydrogen Balmer lines a tool for identifying a subclass of S1 AGN?
Popović, L. Č.; La Mura, G.; Ciroi, S. +4 more
It is becoming clear that we can define two different types of nearby AGN belonging to the Seyfert 1 class (S1), on the basis of the match of the intensities of their Broad Balmer Lines (BBL) with the Boltzmann Plots (BP). These two types of S1 galaxies, that we call BP-S1 and NoBP-S1, are characterized, in first approximation, by Broad Line Regio…
Cassini High Rate Detector V14.0
Economou, T.; DiDonna, P.
The High Rate Detector (HRD) from the University of Chicago is an independent part of the CDA instrument on the Cassini Orbiter that measures the dust flux and particle mass distribution of dust particles hitting the HRD detectors. This data set includes all data from the HRD through December 31, 2013. Please refer to Srama et al. (2004) for a det…