Search Publications
Blasts and shocks in the disc of NGC 4258
Battaner, E.; Mediavilla, E.; Castillo-Morales, A. +1 more
We present integral field spectroscopic observations of the central region of the active galaxy NGC 4258 obtained with the fibre IFU system INTEGRAL. We have been able to detect cold neutral gas by means of the interstellar NaD doublet absorption and to trace its distribution and kinematics with respect to the underlying disc. The neutral gas is b…
The dense and asymmetric central star wind of the young PN He 2-138
Prinja, R. K.; Urbaneja, M. A.; Massa, D. L. +1 more
We present optical European Southern Observatory time series and UV archival (Far Ultraviolet Spectroscopic Explorer (FUSE), Hubble Space Telescope, International Ultraviolet Explorer) spectroscopy of the H-rich central star of He 2-138. Our study targets the central star wind in a very young planetary nebula, and explores physical conditions that…
Frequency-resolved spectroscopy of XB1323-619 using XMM-Newton data: detection of a reflection region in the disc
Balman, Ş.
We present the frequency-resolved energy spectra (FRS) of the low-mass X-ray binary dipper XB1323-619 during persistent emission in four different frequency bands using an archival XMM-Newton observation. FRS method helps to probe the inner zones of an accretion disc. XB1323-619 is an Atoll source and a type-I burster. We find that the FRS is well…
Soft X-ray emission from the inner disc of M33
Warwick, R. S.; Owen, R. A.
We present a study, based on archival XMM-Newton observations, of the extended X-ray emission associated with the inner disc of M33. After the exclusion of point sources with LX > 2 × 1035ergs-1 (0.3-6 keV), we investigate both the morphology and spectrum of the residual X-ray emission, comprising the integrated…
A far-infrared survey at the North Galactic Pole - I. Nearby star-forming galaxies and effect of confused sources on source counts
Kotilainen, Jari K.; Juvela, Mika; Mattila, Kalevi +3 more
We present follow-up observations of the far-infrared (FIR) sources at 90, 150 and 180 µm detected as part of the ISOPHOT EBL project, which has recently measured the absolute surface brightness of the cosmic infrared background (CIRB) radiation for the first time independently from COBE data. We have observed the fields at the North Galacti…
Emission lines of FeXI in the 257-407Å wavelength region observed in solar spectra from EIS/Hinode and SERTS
Mathioudakis, M.; Keenan, F. P.; Davila, J. M. +5 more
Theoretical emission-line ratios involving FeXI transitions in the 257-407Å wavelength range are derived using fully relativistic calculations of radiative rates and electron impact excitation cross-sections. These are subsequently compared with both long wavelength channel Extreme-Ultraviolet Imaging Spectrometer (EIS) spectra from the Hinode sat…
Erratum: Adiabatic chaos in the Prometheus-Pandora system
Shevchenko, Ivan I.
Wave angular momentum and the evolution of planetary rings
Dranikov, I. L.; Fridman, A. M.
A theory is proposed that provides angular momentum conservation through the acoustic drift mechanism for gap and ringlet formation in planetary rings. In this context, a new variant of drift mechanism is found, which is dominant if the collision frequency is of the order of the orbital frequency or less. An angular pseudo-momentum equation is der…