Search Publications
Empirical Absolute Magnitudes, Luminosities and Effective Temperatures of SPB Variables and the Problem of Variability Classification of Monoperiodic Stars
Molenda-Zakowicz, J.; Polubek, G.
We derive semi--empirical log L/Lodot for 27 stars classified as SPB on the basis of Hipparcos photometry and we plot these stars on the log Teff-log L/Lodot diagram. We confirm pulsations of HIP 63210 and HIP 108348 and show that luminosities and masses derived from photometry are of limited use for asteroseismolo…
The XMM-Newton/2dF survey - VII. Is there any X-ray absorption in optically selected QSOs?
Georgakakis, A.; Georgantopoulos, I.; Akylas, A.
We explore the X-ray properties of optically selected quasi-stellar objects (QSOs) spectroscopically identified in the course of the 2dF QSO survey (2QZ). Our main goal is to expand to higher redshifts, previous findings suggesting the presence of a fraction of X-ray obscured sources among the low-redshift, optically selected, broad line active ga…
Principal component analysis of International Ultraviolet Explorer galaxy spectra
Brosch, Noah; Formiggini, Liliana
We analyse the UV spectral energy distribution of a sample of normal galaxies listed in the International Ultraviolet Explorer (IUE) Newly Extracted Spectra (INES) Guide No. 2 - Normal Galaxies using a principal component analysis. The sample consists of the IUE short-wavelength (SW) spectra of the central regions of 118 galaxies, where the IUE ap…
Observational evidence of pitch angle isotropization by IMF waves
Bochsler, P.; Klecker, B.; Möbius, E. +4 more
A statistical analysis of interstellar He+ pickup ion measurements from SOHO/CTOF combined with magnetic field data from WIND/MFI enable quantitative study of wave-particle interactions in the inner heliosphere for the first time. Magnetic field vector measurements with a time resolution of 3 seconds are used to determine power spectrum…
A search for X-ray flashes with XMM-Newton
Law, Nicholas M.; Kulkarni, Shrinivas R.; Rutledge, Robert E.
We searched for X-ray flashes (XRFs) - which we defined as ~10-s duration transient X-ray events observable in the 0.4-15 keV passband - in fields observed using XMM-Newton with the EPIC/pn detector. While we find two non-Poissonian events, the astrophysical nature of the events is not confirmed in fully simultaneous observations with the EPIC/MOS…
Diagnostics of the Local Interstellar Medium using particles and UV radiation
Lallement, R.; Vallerga, J.; Raymond, J. R.
The chain of processes which govern trajectories and ionization of neutral particles from the circumsolar interstellar gas to the inner heliosphere can now be studied by combining several types of diagnostics: solar backscattered radiation (H and He), direct detection of neutral particles (He), detection of pickup ions of interstellar origin (H, H…
Assessing the galaxy population out to z ∼ 2 using the Hubble Deep Field South
Horellou, C.; Wiegert, T.; de Mello, D. F.
In this work we use the Hubble Deep Field South (HDF-S) version 2 images to assess the galaxy population out to z ∼ 2. We have used two methods of templates fitting of the spectral energy distributions to obtain photometric redshifts and classify the objects. The Bayesian photometric redshifts gave better results when compared with 54 spectroscopi…
Dynamics of the Globular Cluster NGC 6656 with WFPC2
Chen, Li; Chen, Ding; Wang, Jia-Ji
We have used the Hubble Space Telescope observations to measure proper motion of the globular cluster NGC 6656 (M22) with respect to the background bulge stars and its internal velocity dispersion profile. Based on the proper motion of the cluster, its space velocity (Pi,Theta,W) = (184+/-3, 209+/-14, 132+/-15) km s-1 and galactic orbit…
Multi-point Cluster Observations of VLF Risers Fallers and Hooks at and near the Plasmapause
Gurnett, D. A.; Balogh, A.; Pickett, J. S. +11 more
Temporal-spatial structure of magnetic merging at the magnetopause inferred from 557.7-nm all-sky images
Balogh, A.; Lester, M.; Scudder, J. +7 more
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