Search Publications
The environmental dependence of properties of galaxies around the RDCSJ0910+54 cluster at z = 1.1
Finoguenov, A.; Morokuma, T.; Tanaka, M. +6 more
We report on the environmental dependence of properties of galaxies around the RDCSJ0910+54 cluster at z=1.1. We obtained multi-band wide-field images of the cluster with Suprime-Cam and MOIRCS on Subaru and WFCAM on UKIRT. Also, an intensive spectroscopic campaign was carried out using LRIS on Keck and FOCAS on Subaru. We collected 161 spectra wi…
An occultation event in the nucleus of the planetary nebula M 2-29
Zijlstra, A. A.; Hajduk, M.; Gesicki, K.
Aims: Eclipses and occultations of post-AGB stars provide a powerful method of exploring the near-stellar environment, including close companions and circumstellar debris disks. Only six eclipsing systems and one dust-occultation system are currently known. New cases are important for our understanding of binary evolution during the AGB mass-loss …
The structure and dynamics of a bright point as seen with Hinode, SoHO and TRACE
Doyle, J. G.; Madjarska, M. S.; Maclean, R. C. +1 more
Context: Solar coronal bright points have been studied for more than three decades, but some fundamental questions about their formation and evolution still remain unanswered.
Aims: Our aim is to determine the plasma properties of a coronal bright point and compare its magnetic topology extrapolated from magnetogram data with its appearance in…
Where are the hot ion lines in classical T Tauri stars formed?
Schmitt, J. H. M. M.; Günther, H. M.
Context: Classical T Tauri stars (hereafter CTTS) show a plethora of in- and outflow signatures in a variety of wavelength bands.
Aims: In order to constrain gas velocities and temperatures, we analyse the emission in the hot ion lines.
Methods: We use all available archival FUSE spectra of CTTS to measure the widths, fluxes and shifts of …
Extended Red Emission and the evolution of carbonaceous nanograins in NGC 7023
Cuillandre, J. -C.; Joblin, C.; Thomas, J. +3 more
Context: Extended Red Emission (ERE) was recently attributed to the photo-luminescence of either doubly ionized Polycyclic Aromatic Hydrocarbons (PAH++), or charged PAH dimers ([PAH{2}] ^+).
Aims: We analysed the visible and mid-infrared (mid-IR) dust emission in the North-West and South photo-dissociation regions of the reflection …
A 1.3 cm wavelength radio flare from a deeply embedded source in the Orion BN/KL region
Menten, K. M.; Reid, M. J.; Forbrich, J.
Aims:Our aim was to measure and characterize the short-wavelength radio emission from young stellar objects (YSOs) in the Orion Nebula Cluster and the BN/KL star-forming region.
Methods: We used the NRAO Very Large Array at a wavelength of λ=1.3 cm and we studied archival X-ray, infrared, and radio data.
Results: During our observation, a …
The X-ray luminosity of solar-mass stars in the intermediate age open cluster NGC 752
Micela, G.; Favata, F.; Giardino, G. +1 more
Aims: While observational evidence shows that most of the decline in a star's X-ray activity occurs between the age of the Hyades (~ 8 × 108 yr) and that of the Sun, very little is known about the evolution of stellar activity between these ages. To gain information on the typical level of coronal activity at a star's intermediate age, …
A deep INTEGRAL hard X-ray survey of the 3C 273/Coma region
Paltani, S.; Walter, R.; Dwelly, T. +3 more
We present an analysis of the deepest hard X-ray survey to date of about 2500 deg2 performed by the IBIS instrument on board INTEGRAL in the 20-60 keV band, with a total exposure time of 4 Ms. We find 34 candidate sources, for which we try to find counterparts at other wavelengths. The ratio of Seyfert 1 to Seyfert 2 is significantly mo…
Intensity oscillations observed with Hinode near the south pole of the Sun: leakage of low frequency magneto-acoustic waves into the solar corona
Srivastava, A. K.; Dwivedi, B. N.; Zaqarashvili, T. V. +1 more
Aims: We study intensity oscillations in the solar chromosphere and corona, above a quiet-Sun magnetic network.
Methods: We analyse the time series of He II 256.32 Å, Fe XI 188.23 Å and Fe XII 195.12 Å spectral lines, observed close to the south pole, by the EUV Imaging Spectrometer (EIS), onboard Hinode. We use a standard wavelet tool, to pro…
Long-period oscillations in solar coronal bright points
Li, S.; Tian, H.; Xia, L. -D.
Aims: By analyzing TRACE (Transition Region and Coronal Explorer) data, we investigate intensity oscillations in coronal bright points (BPs) as well as the underlying chromosphere.
Methods: A Fourier analysis is applied to a sequence of images observed in the 195 Å and 1216 Å passbands of TRACE. We produce images of Fourier power in three diff…