Search Publications
Observations of the nightside venusian hydrogen corona with SPICAV/VEX
Bertaux, J. -L.; Chaufray, J. -Y.; Leblanc, F. +2 more
Observations of the venusian hydrogen corona on the nightside (8 PM local time) have been performed with SPICAV instrument on board Venus Express from 12 to 15 October 2011. These observations were associated with interplanetary observations obtained at apoapsis to subtract the interplanetary contribution. The observed brightness variation with al…
Persistent Near-Surface Flow Structures from Local Helioseismology
van Driel-Gesztelyi, L.; Harra, L.; Baker, D. +3 more
Near-surface flows measured by the ring-diagram technique of local helioseismology show structures that persist over multiple rotations. We examine these phenomena using data from the Global Oscillation Network Group (GONG) and the Helioseismic and Magnetic Imager (HMI) and show that a correlation analysis of the structures can be used to estimate…
Small-scale magnetic and velocity inhomogeneities in a sunspot light bridge
Louis, Rohan E.
High resolution spectro-polarimetric observations of a sunspot light bridge by Hinode, reveal small-scale inhomogeneities in the magnetic field and velocity. These inhomogeneities arise as a consequence of a weak, secondary lobe in the Stokes V profile which have a polarity opposite that of the sunspot and very large (>5 km s-1) Dopp…
Halo Coronal Mass Ejections and Their Relation to DH Type-II Radio Bursts
Shanmugaraju, A.; Bendict Lawrance, M.
A set of 88 halo CMEs observed by the Solar and Heliospheric Observatory/Large Angle Solar Coronagraph (SOHO/LASCO) during the period 2005 to 2010 is considered to study the relationship of these halo CMEs with Type-II radio bursts in the deca-hectametric (DH) wavelength range observed by Wind/(Plasma and Radio Waves: WAVES). Among the 88 events, …
Morphology and structure of BzK-selected galaxies at z ∼ 2 in the CANDELS-COSMOS field
Kong, Xu; Chen, Yang; Fang, Guan-Wen +1 more
Utilizing a BzK-selection technique, we obtain 14550 star-forming galaxies (sBzKs) and 1763 passive galaxies (pBzKs) at z ∼ 2 from the K-selected (KAB < 22.5) catalog in the COSMOS/UltraVISTA field. The differential number counts of sBzKs and pBzKs are consistent with the results from the literature. Compared to the observed results,…
JEM-X/INTEGRAL X-ray survey of the galactic center region
Grebenev, S. A.; Mereminskiy, I. A.
An X-ray survey of the Galactic center region with a radius of ~20° has been performed using the data obtained with the JEM-X telescope onboard the INTEGRAL observatory over ~10 years of observations (2003-2013). The exposure at the field center directly toward the Galactic center has reached 4.8 Ms. We have constructed sky maps in the 5-10 and 10…
Constraints on the combined models with R 2 ‑ q f ( R )
Geng, Chao-Qiang; Lee, Chung-Chi; Lin, Shan
We investigate the observational constraints on the modified gravity, which combines the
Lifetimes and Oscillator Strengths for Ultraviolet Transitions in Singly Ionized Lead
Federman, S. R.; Ritchey, A. M.; Irving, R. E. +5 more
We present the results of lifetime measurements made using beam-foil techniques on levels of astrophysical interest in Pb ii producing lines at 1203.6 Å (6s6p2 {}2{D}3/2) and 1433.9 Å (6{s}26d {}2{D}3/2). We also report the first detection of the Pb ii λ 1203 line in the interstella…
The XMM deep survey in the CDF-S. VIII. X-ray properties of the two brightest sources
Brandt, W. N.; Vignali, C.; Gilli, R. +7 more
We present results from the deep XMM-Newton observations of the two brightest X-ray sources in the Chandra Deep Field South (CDFS), PID 203 (z = 0.544) and PID 319 (z = 0.742). The long exposure of 2.5 Ms over a 10 year period (net 4 yr with a 6 yr gap) makes it possible to obtain high quality X-ray spectra of these two Type I AGN with X-ray lumin…
Broad-band X-ray spectra of anomalous X-ray pulsars and soft γ-ray repeaters: pulsars in a weak-accretion regime?
Zezas, A.; Trümper, J. E.; Kylafis, N. D.
We present the results from the analysis of the broad-band X-ray spectra of five anomalous X-ray pulsars (AXPs) and soft γ-ray repeaters (SGRs). We fit their Suzaku and INTEGRAL spectra with models appropriate for the X-ray emission from the accretion flow on to a pulsar. We find that their X-ray spectra can be well described with this model. In p…