Search Publications
Far-infrared spectroscopic observations of the Galactic center region
Nakagawa, T.; Okada, Y.; Spaans, M. +2 more
Context: The Galactic center region is luminous in the far-infrared (FIR), but dominant sources of this luminosity are still controversial.
Aims: We investigate physical conditions of the diffuse interstellar medium in the Galactic center region by multi-line spectroscopy in the FIR.
Methods: We analyze the archival data of the Galactic ce…
Central Spiral Structure of Molecular Gas in Maffei 2
Kuno, Nario; Nakanishi, Kouichiro; Sorai, Kazuo +1 more
The distribution and kinematics of molecular gas in the central region of the barred spiral galaxy Maffei2 were investigated using a data set of 12CO(1-0),12CO(2-1), CS(2-1) lines, and 103GHz continuum. We found that the offset ridges along the kpc-scale bar continue to the central spiral structure embedded in a weak oval str…
Study of reconnection-associated multiscale fluctuations with Cluster and Double Star
Zhang, T. L.; Lucek, E.; RèMe, H. +8 more
The objective of the paper is to asses the specific spectral scaling properties of magnetic reconnection associated fluctuations/turbulence at the earthward and tailward outflow regions observed simultaneously by the Cluster and Double Star (TC-2) spacecraft on 26 September 2005. Systematic comparisons of spectral characteristics, including varian…
XMM-Newton temperature maps for five intermediate redshift clusters of galaxies
Durret, Florence; Lima Neto, Gastão B.
We have analyzed XMM-Newton archive data for five clusters of galaxies (redshifts 0.223 0.313) covering a wide range of dynamical states, from relaxed objects to clusters undergoing several mergers. We present here temperature maps of the X-ray gas together with a preliminary interpretation of the formation history of these clusters.
Enhanced p-Mode Absorption Seen Near the Sunspot Umbral Penumbral Boundary
Mathew, Shibu K.
We investigate p-mode absorption in a sunspot using SOHO/MDI high-resolution Doppler images. The Doppler power computed from a 3.5-hour data set is used for studying the absorption in a sunspot. The result shows an enhancement in absorption near the umbral - penumbral boundary of the sunspot. We attempt to relate the observed absorption with the m…
Advanced method to derive the IMF direction near Mars from cycloidal proton distributions
Kallio, E.; Fedorov, A.; Barabash, S. +7 more
In a previous paper, we showed a method for deriving the interplanetary magnetic field (IMF) orientation from the velocity distribution of ring-like distributed ions as measured by the Ion Mass Analyser (IMA) on board Mars Express (MEX). This method has been improved so that one can derive the IMF orientation from a very limited portion of the rin…
Physical and kinematical properties of the X-ray absorber in the broad absorption line quasar APM 08279+5255
Ramírez, J. M.
Context: We have re-analyzed the X-ray spectra of the gravitational lensed high-redshift BAL QSO APM 08279+5255, observed with the XMM-Newton and Chandra observatories. Previous studies (Hasinger et al. 2002, ApJ, 573, L77; Chartas et al. 2002, ApJ, 579, 169) detected unusual, highly-ionized iron absorption features, but differed in their interpre…
Post-hoc derivation of SOHO Michelson doppler imager flat fields
Potts, H. E.; Diver, D. A.
Context: The SOHO satellite now offers a unique perspective on the Sun as it is the only space-based instrument that can provide large, high-resolution data sets over an entire 11-year solar cycle. This unique property enables detailed studies of long-term variations in the Sun. One significant problem when looking for such changes is determining …
Probing the nature of IGR J16493-4348: spectral and temporal analysis of the 1-100 keV emission
de Rosa, A.; Hill, A. B.; Bird, A. J. +5 more
IGR J16493-4348 was one of the first new sources to be detected by the INTErnational Gamma-Ray Astrophysics Laboratory (INTEGRAL) γ-ray telescope in the 18-100 keV energy band. Based on spatial coincidence, the source was originally associated with the free radio pulsar PSR J1649-4349. Presented here are the results of 2.8 Ms of observations made …
The angular separation of the components of the Cepheid AWPer
Massa, D.; Evans, N. R.
The 6.4d classical Cepheid AWPer is a spectroscopic binary with a period of 40yr. Analysing the centroids of Hubble Space Telescope/Space Telescope Imaging Spectrograph (HST/STIS) spectra obtained in 2001 November, we have determined the angular separation of the binary system. Although we currently have spatially resolved data for a single epoch …