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PROPERTIES AND SPECTRAL BEHAVIOUR OF CLUSTER RADIO HALOS
L. FERETTI,G. BRUNETTI,G. GIOVANNINI,N. KASSIM,E. ORRU,G. SETTI 한국천문학회 2004 Journal of The Korean Astronomical Society Vol.37 No.5
Several arguments have been presented in the literature to support the connection between radiohalos and cluster mergers. The spectral index distributions of the halos in A665 and A2163 provide anew strong conrmation of this connection, i.e. of the fact that the cluster merger plays an importantrole in the energy supply to the radio halos. Features of the spectral index (attening and patches)are indication of a complex shape of the radiating electron spectrum, and are therefore in support ofelectron reacceleration models. Regions of atter spectrum are found to be related to the recent merger.In the undisturbed cluster regions, instead, the spectrum steepens with the distance from the clustercenter. The plot of the integrated spectral index of a sample of halos versus the cluster temperatureindicates that clusters at higher temperature tend to host halos with atter spectra. This correlationprovides further evidence of the connection between radio emission and cluster mergers.
The magnetic instability of Yb<sub>2</sub>Pd<sub>2</sub>(In,Sn) in a non-Fermi liquid environment
Bauer, E,Hilscher, G,Michor, H,Paul, Ch,Aoki, Y,Sato, H,Adroja, D T,Park, J-G,Bonville, P,Godart, C,Sereni, J,Giovannini, M,Saccone, A IOP Pub 2005 Journal of physics, an Institute of Physics journa Vol.17 No.11
<P>Various concentrations of the solid solution Yb<SUB>2</SUB>Pd<SUB>2</SUB>In<SUB>1−<I>x</I></SUB>Sn<SUB><I>x</I></SUB> ranging from <I>x</I> = 0 to 1 with the tetragonal Mo<SUB>2</SUB>FeB<SUB>2</SUB>-type structure were prepared and their physical properties were studied by means of bulk and spectroscopic measurements as a function of temperature, pressure and magnetic fields. Results deduced from these studies indicate a slight variation of the valency of the Yb ions, from <img SRC='http://ej.iop.org/images/0953-8984/17/11/032/cm192308ieqn1.gif' ALIGN='MIDDLE' ALT='\nu \approx 2.9 '/> for both border compounds to &ngr; = 3 at <I>x</I> = 0.6. This variation gives rise to the appearance of long range magnetic order in a narrow concentration region around <I>x</I> = 0.6, while both border compounds remain non-magnetic. The outstanding concentration dependence for the ordered regime may be indicative of two quantum critical points, a novel feature not yet observed in Yb compounds. </P>
Discovery of off-axis jet structure of TeV blazar Mrk 501 with mm-VLBI
Koyama, S.,Kino, M.,Giroletti, M.,Doi, A.,Giovannini, G.,Orienti, M.,Hada, K.,Ros, E.,Niinuma, K.,Nagai, H.,Savolainen, T.,Krichbaum, T. P.,Pé,rez-Torres, M. Á,. Springer-Verlag 2016 Astronomy and astrophysics Vol.586 No.-
Redaelli, M.,Kepler, S. O.,Costa, J. E. S.,Winget, D. E.,Handler, G.,Castanheira, B. G.,Kanaan, A.,Fraga, L.,Henrique, P.,Giovannini, O.,Provencal, J. L.,Shipman, H. L.,Dalessio, J.,Thompson, S. E.,Mu Blackwell Publishing Ltd 2011 Monthly notices of the Royal Astronomical Society Vol.415 No.2
<P><B>ABSTRACT</B></P><P>PG 1351+489 is one of the 20 DBVs – pulsating helium‐atmosphere white dwarf stars – known and has the simplest power spectrum for this class of star, making it a good candidate to study cooling rates. We report accurate period determinations for the main peak at 489.334 48 s and two other normal modes using data from the Whole Earth Telescope (WET) observations of 1995 and 2009. In 2009, we detected a new pulsation mode and the main pulsation mode exhibited substantial change in its amplitude compared to all previous observations. We were able to estimate the star's rotation period, of 8.9 h, and discuss a possible determination of the rate of period change of (2.0 ± 0.9) × 10<SUP>−13</SUP> s s <SUP>−1</SUP>, the first such estimate for a DBV.</P>