1,050 research outputs found
B,V,I - photometry of 20 dwarf irregular galaxies within 10 Mpc
CCD - photometry is presented for 20 dIrr galaxies situated in the nearby
complexes CenA/M83, and CVnI as well as in the general field of the Local
Volume. We present integrated magnitudes of the galaxies in B,V,I - bands and
also surface brightness profiles to a median isophote mu_B ~ 28 mag /sq.arcsec.
The popular Sersic parameterization of surface brightness profiles generally
does a poor job of simultaneously fitting the inner cores and outer exponential
surface brightness fall-offs observed in many of our targets. The observed
sample is a part of a general project to image about 500 nearby (D < 10 Mpc)
dwarf galaxies in multiple bands.Comment: 3 figures, accepted to the MNRA
Spin-transfer mechanism of ferromagnetism in polymerized fullerenes: calculations
A mechanism of the high temperature ferromagnetism in polymerized fullerenes
is suggested. It is assumed that some of the C molecules in the crystal
become magnetically active due to spin and charge transfer from the
paramagnetic impurities (atoms or groups), such as hydrogen, fluorine, hydroxyl
group OH, amino group NH, or methyl group CH, dispersed in the
fullerene matrix. The exchange interaction between the spins localized on the
magnetically active fullerenes is evaluated using \textit{ab initio}
calculations. The nearest neighbour and next nearest neighbour exchange
interaction is found to be in the range eV, that is, high enough
to account for the room temperature ferromagnetism.Comment: typos corrected, 8 pages, 3 figures, LaTe
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