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Large-scale fluctuations in the number density of galaxies in independent surveys of deep fields
Baryshev, Yu. V.; Shirokov, S. I.; Lovyagin, N. Yu. +1 more
New arguments supporting the reality of large-scale fluctuations in the density of the visible matter in deep galaxy surveys are presented. A statistical analysis of the radial distributions of galaxies in the COSMOS and HDF-N deep fields is presented. Independent spectral and photometric surveys exist for each field, carried out in different wave…
Statistical Analysis of Periodic Oscillations in LASCO Coronal Mass Ejection Speeds
Shanmugaraju, A.; Gopalswamy, N.; Michalek, G. +2 more
A large set of coronal mass ejections (CMEs, 3463) has been selected to study their periodic oscillations in speed in the Solar and Heliospheric Observatory (SOHO) mission's Large Angle and Spectrometric Coronagraph (LASCO) field of view. These events, reported in the SOHO/LASCO catalog in the period of time 1996 - 2004, were selected based on hav…
Linking the structural properties of galaxies and their star formation histories with STAGES
Bell, Eric F.; Wolf, Christian; Aragón-Salamanca, Alfonso +5 more
We study the links between star formation history and structure for a large mass-selected galaxy sample at 0.05 ≤ zphot ≤ 0.30. The galaxies inhabit a very broad range of environments, from cluster cores to the field. Using Hubble Space Telescope (HST) images, we quantify their structure following Hoyos et al., and divide them into dist…
Is the Stellar System WR 11 a Gamma-Ray Source?
Benaglia, Paula
Many early-type stars are in systems; some of them have been indicated as putative high-energy emitters. The radiation would be produced at the region where two stellar winds collide. Compelling evidence of such emission was found only for the colliding-wind binary (CWB) Eta Car, which was associated to a GeV source. Very recently, the closest CWB…
The XMM spectral catalog of SDSS optically selected Seyfert 2 galaxies
Jiménez-Andrade, E. F.; Ranalli, P.; Georgantopoulos, I. +6 more
We present an X-ray spectroscopic study of optically selected (SDSS) Seyfert 2 (Sy2) galaxies. The goal is to study the obscuration of Sy2 galaxies beyond the local universe, using good quality X-ray spectra in combination with high S/N optical spectra for their robust classification. We analyzed all available XMM-Newton archival observations of n…
Milne-Eddington inversion for unresolved magnetic structures in the quiet Sun photosphere
Bommier, Véronique
This paper is first devoted to present our method for modeling unresolved magnetic structures in the Milne-Eddington inversion of spectropolarimetric data. The related definitions and other approaches and different used inversion algorithms are recalled for comparison. In a second part, we apply our method to quiet Sun data outside active regions.…
Some new aspects of the transient ionization layer of comet Siding Spring origin in the Martian upper atmosphere
Venkateswara Rao, N.; Rao, S. V. B.; ManasaMohana, P. +1 more
The close encounter of comet Siding Spring with Mars resulted in the formation of a dense transient ionization layer in the Martian upper atmosphere at altitudes between 80 and 120 km. Instruments on three spacecraft orbiting Mars detected the presence of this layer, as reported in previous publications. In this study, we reanalyzed the ionograms …
The spatially resolved correlation between [NII] 205 µm line emission and the 24 µm continuum in nearby galaxies
Ibar, E.; De Looze, I.; Cormier, D. +12 more
A correlation between the 24 µm continuum and the [Nii] 205 µm line emission may arise if both quantities trace the star formation activity on spatially-resolved scales within a galaxy, yet has so far only been observed in the nearby edge-on spiral galaxy NGC 891. We therefore assess whether the [Nii] 205-24 µm emission correlati…
Gaia
Cacciari, C.; Pancino, E.; Bellazzini, M.
A review of the Gaia mission and its science performance after one year of operations will be presented, and the contribution to reconstructing the history of the Milky Way will be outlined.
Radial profiles of the Phoebe ring: A vast debris disk around Saturn
Hamilton, Douglas P.; Hedman, Matthew M.; Burns, Joseph A. +2 more
We present observations at optical wavelengths with the Cassini Spacecraft's Imaging Science System of the Phoebe ring, a vast debris disk around Saturn that seems to be collisionally generated by its irregular satellites. The analysis reveals a radial profile from 80-260 Saturn radii (RS) that changes behavior interior to ≈110RS