Search Publications
On two low harmonics of CMB correlation maps
Verkhodanov, O. V.; Naiden, Ya. V.; Keshelava, T. V.
We have analyzed two powerful correlation harmonics (ℓ = 3and ℓ = 6) found in the correlation of the ILC WMAP signal with the submillimeter and infrared range data from the FSC IRAS and Planck catalogs. The mode phases of thesemultipoles were computed. In the spots we have found in the harmonics, the source counts were made from the NVSS, FIRST, F…
A Precise Physical Orbit for the M-dwarf Binary Gliese 268
Queloz, D.; Ségransan, D.; Demory, B. -O. +11 more
We report high-precision interferometric and radial velocity (RV) observations of the M-dwarf binary Gl 268. Combining measurements conducted using the IOTA interferometer and the ELODIE and Harvard Center for Astrophysics RV instruments leads to a mass of 0.22596 ± 0.00084 M ⊙ for component A and 0.19230 ± 0.00071 M ⊙ for co…
Intermediate old star clusters in a young starburst: the case of NGC 5253
Gallagher, J.; Crnojević, D.; Harbeck, D.
We investigate the star cluster population in the outer parts of the starburst galaxy NGC 5253 using archive images taken with the Hubble Space Telescope's Advanced Camera for Surveys. Based on the F415W, F555W and F814W photometry ages and masses are estimated for bona fide star cluster candidates. We find three potentially massive (≥105
Electron pitch angle distribution during magnetic reconnection diffusion region observations in the Earth's magnetotail
Eastwood, J. P.; Taylor, M. G. G. T.; Borg, A. L.
The Earth's magnetosphere provides an excellent laboratory for magnetic reconnection research. In particular, the magnetotail current sheet that is formed between the interface of the similar Northern and Southern Hemispheres of the magnetotail provides a relatively stable symmetric reconnection configuration that can be used to study basic aspect…
A simulation approach of high-frequency electrostatic waves found in Saturn's magnetosphere
Koen, Etienne J.; Collier, Andrew B.; Maharaj, Shimul K.
Using a particle-in-cell simulation, the characteristics of electron plasma and electron acoustic waves are investigated in plasmas containing an ion and two electron components. The electron velocities are modeled by a combination of two κ distributions. The model applies to the extended plasma sheet region in Saturn's magnetosphere where the coo…
Inverse Compton Scattering Model for X-Ray Emission of the Gamma-Ray Binary LS 5039
Yamaguchi, M. S.; Takahara, F.
We propose a model for the gamma-ray binary LS 5039 in which the X-ray emission is due to the inverse Compton (IC) process instead of the synchrotron radiation. Although the synchrotron model has been discussed in previous studies, it requires a strong magnetic field which leads to a severe suppression of the TeV gamma-ray flux in conflict with H.…
The XMM-Newton slew view of IGRJ17361-4441: A transient in the globular cluster NGC 6388
Read, A. M.; Nucita, A. A.; De Paolis, F. +1 more
IGRJ17361-4441 is a hard transient recently observed by the INTEGRAL satellite. The source, close to the center of gravity of the globular cluster NGC 6388, quickly became the target of follow-up observations conducted by the Chandra, Swift/XRT and RXTE observatories. Here, we concentrate in particular on a set of observations conducted by the XMM…
Particle acceleration and gamma rays in solar flares: Recent observations and new modeling
Gan, W. Q.; Miroshnichenko, L. I.
Experiments on SMM, GAMMA, Yohkoh, GRANAT, Compton GRO, INTEGRAL, RHESSI and CORONAS-F satellites over the past three decades have provided copious data for fundamental research relating to particle acceleration, transport and energetics of flares and to the ambient abundance of the solar corona, chromosphere and photosphere. We summarize main res…
IGR J18179-1621: an obscured X-ray pulsar discovered by INTEGRAL
Ferrigno, C.; Bozzo, E.; Falanga, M. +2 more
We report on all the INTEGRAL and Swift data collected during the first outburst observed from IGR J18179-1621. The broad-band spectral analysis showed that the X-ray emission from the source is heavily absorbed (NH ≃ 1023 cm-2), and well-described by a flat power-law with a high energy rollover (cutoff energy 9-12…
The features of microwave solar radiation observed in the stage of formation and initial propagation of geoeffective coronal mass ejections
Sheiner, O. A.; Fridman, V. M.
We consider sporadic radio emission which precedes recording of geoeffective coronal mass ejections, using the data of broadband patrol observations of the Sun in the centimeter-, decimeter-, and meter-wave ranges in some periods of the XXIst-XXIIIrd solar-activity cycles. The total amount of used information instruments covers 339 events and incl…