Search Publications
Early Super Soft Source Spectra in RS Oph
Ness, J. -U.
Recent Swift X-ray monitoring campaigns of novae have revealed extreme levels of variability during the early super-soft-source (SSS) phase. The first time this was observed was during the 2006 outburst of the recurrent nova RS Oph which was also extensively covered by grating observations with XMM-Newton and Chandra. I focus here on an XMM-Newton…
Is the O2(a1Δg) Venus nightglow emission controlled by solar activity?
Gérard, Jean-Claude; Soret, Lauriane
Several past studies showed that the O2(a1Δg) Venus nightglow emission at 1.27 µm is highly variable on a timescale of hours. We examine whether the intensity of this emission shows a more global trend linked to solar activity.
Suzaku observation of X-ray variability in soft state LMC X-1
Makishima, Kazuo; Tashiro, Makoto S.; Terada, Yukikatsu +3 more
This paper reports the results of Suzaku observation of the spectral variation of the black hole binary LMC X-1 in the soft state. The observation was carried out in 2009 from July 21 to 24. the obtained net count rate was ∼ 30 counts s-1 in the 0.5-50 keV band with ∼ 10% peak-to-peak flux variation. The time-averaged X-ray spectrum can…
Strong induction effects during the substorm on 27 August 2001
Wang, C.; Pu, Z.; Mishin, V. M. +2 more
We report on strong induction effects notably contributing to the cross polar cap potential drop and the energy balance during the growth and active phases of the substorm on 27 August 2001. The inductance of the magnetosphere is found to be crucial for the energy balance and electrical features of the magnetosphere in the course of the substorm. …
A CMB Gibbs Sampler for Localized Secondary Anisotropies
Bull, Philip; Ferreira, Pedro G.; Wehus, Ingunn K. +4 more
In addition to primary fluctuations, cosmic microwave background (CMB) temperature maps contain a wealth of additional information in the form of secondary anisotropies. However, secondary effects that can be identified with individual objects, such as the thermal and kinetic Sunyaev-Zel’dovich (TSZ-KSZ) effects due to galaxy clusters, are difficu…
Activity of Comet C/2006 W3 Christensen
Kossacki, Konrad J.; Szutowicz, Slawomira
Emission of volatiles for the long-period Comet C/2006 W3 Christensen was observed before perihelion from 3.7 AU through perihelion passage at 3.13 AU till 5.0 AU after perihelion. Coma is found to be strongly enriched in molecules more volatile than water. At heliocentric distances 3.13-3.7 AU activity of the comet was mostly driven by CO emissio…
The prospective search for highly ionized technetium in hot (pre-) white dwarfs
Rauch, T.; Werner, K.; Kruk, J. W. +1 more
The discovery of technetium (Tc) in the atmospheres of red giants by Merrill (1952, ApJ, 116, 21) constituted convincing proof that s-process nucleosynthesis is indeed occurring in evolved stars. In principle, Tc should still be present in the atmospheres of hot post-AGB stars and (pre-) white dwarfs although, due to radioactive decay, it should b…
Discovery of new X-ray sources near the unidentified gamma-ray source HESS J1841-055
Koyama, K.; Nobukawa, M.; Tsuru, T. G. +1 more
HESS J1841-055 is a diffuse unidentified gamma-ray source with the size of ∼1°.3 × 1°. No conclusive counterpart in other wavelengths has so far detected. To search for X-rays responsible for the TeV emission, the Suzaku observations were conducted, which covered a half region of the HESS source. In the soft band (0.5-2.0 keV), we discovered a dif…
Plasma draining and replenishing near a solar active region inferred from cross-correlation between radiation intensity and Doppler shift
Wang, Xin; Zhang, JingBo; He, JianSen +3 more
Using observations from the EUV Imaging Spectrometer (EIS) onboard Hinode, we exam the plasma dynamics around the edge of the active region 10977, possibly associated with the source of nascent slow/intermediate solar wind. The correlation between the temporal profiles of the radiation intensity and Doppler shift for each emission line are analyze…
A study on the mid-infrared sources that dramatically brightened
Matsunaga, Noriyuki; Nakada, Yoshikazu; Ita, Yoshifusa +5 more
We present results of near-infrared (NIR) photometric and spectroscopic observations of mid-infrared (MIR) sources that brightened dramatically. Using Infrared Astronomical Satellite (IRAS), AKARI, and Wide-field Infrared Survey Explorer (WISE) point source catalogs, we found that four sources (IRAS 19574+4941, V2494 Cyg, IRAS 22343+7501, and V583…