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On the regularity of the covariance matrix of a discretized scalar field on the sphere
Barreiro, R. B.; Herranz, D.; Martínez-González, E. +2 more
We present a comprehensive study of the regularity of the covariance matrix of a discretized field on the sphere. In a particular situation, the rank of the matrix depends on the number of pixels, the number of spherical harmonics, the symmetries of the pixelization scheme and the presence of a mask. Taking into account the above mentioned compone…
Dawn-Dusk Asymmetries at the Terrestrial Magnetopause
Hasegawa, H.; Haaland, S. E.; Maes, L. +1 more
Investigation on M-class Flare-Associated Coronal Mass Ejections with and Without DH Type II Radio Bursts
Shanmugaraju, A.; Selvarani, G.; Lawrance, M. Bendict +1 more
We perform a statistical analysis on 157 M-class soft X-ray flares observed during 1997 - 2014 with and without deca-hectometric (DH) type II radio bursts aiming at the reasons for the non-occurrence of DH type II bursts in certain events. All the selected events are associated with halo Coronal Mass Ejections (CMEs) detected by the Solar and Heli…
Robust Cross-correlation-based Measurement of Clump Sizes in Galaxies
Glazebrook, Karl; Obreschkow, Danail; Abraham, Roberto G. +4 more
Stars form in molecular complexes that are visible as giant clouds (∼ {10}5-6 {M}⊙ ) in nearby galaxies and as giant clumps (∼ {10}8-9 {M}⊙ ) in galaxies at redshifts z≈ 1-3. Theoretical inferences on the origin and evolution of these complexes often require robust measurements of their characteristic si…
High-resolution Near-infrared Observations of a Small Cluster Associated with a Bright-rimmed Cloud in W5
Kusune, Takayoshi; Watanabe, Makoto; Sugitani, Koji +4 more
We carried out near-infrared (IR) observations to examine star formation toward the bright-rimmed cloud SFO 12, of which the main exciting star is O7V star in W5-W. We found a small young stellar object (YSO) cluster of six members embedded in the head of SFO 12 facing its exciting star, aligned along the UV radiation incident direction from the e…
The Appearance of Non-Spherical Systems. Application to LMXB
Różańska, A.; Madej, J.; Bełdycki, B. +2 more
We study the appearance of the neutron star-accretion disk system as seen by a distant observer in the UV/X-ray domain. The observed intensity spectra are computed assuming non-spherical geometry of the whole system, in which outgoing spectrum is not represented by the flux spectrum, the latter being valid for spherically symmetric objects. Intens…
Dynamic Deuterium Enrichment in Cometary Water via Eley-Rideal Reactions
Yao, Yunxi; Giapis, Konstantinos P.
The deuterium-to-hydrogen ratio (D/H) in water found in the coma of Jupiter family comet (JFC) 67P/Churyumov-Gerasimenko was reported to be (5.3 ± 0.7) × 10-4, the highest among comets and three times the value for other JFCs with an ocean-like ratio. This discrepancy suggests the diverse origins of JFCs and clouds the issue of the orig…
Evolution of clusters and cosmology
Arnaud, M.
Recent Sunyaev-Zeldovich (SZ) surveys (ACT, Planck, SPT) have provided new cluster catalogs, very significantly expanding the coverage of the mass-redshift plane, while XMM-Newton surveys are pushing cluster detection to lower masses, up to z ∼ 1 and beyond. Cosmological analysis of the new cluster samples, particularly that of the largest Planck …
A strategy for an accurate estimation of the basal permittivity in the Martian North Polar Layered Deposits
Lauro, S. E.; Gennarelli, G.; Pettinelli, E. +4 more
This paper deals with the investigation of the Mars subsurface by means of data collected by the Mars Advanced Radar for Subsurface and Ionosphere Sounding working at few megahertz frequencies. A data processing strategy, which combines a simple inversion model and an accurate procedure for data selection is presented. This strategy permits to mit…
Long-term Study of the Double Pulsar J0737-3039 with XMM-Newton: Spectral Analysis
Iacolina, M. N.; Pellizzoni, A.; Egron, E. +4 more
We present a long-term spectral monitoring of the unique double pulsar binary PSR J0737-3039 corresponding to two “Large Programs” performed by XMM-Newton in 2006 and 2011. Spectral variability of pulsar emission in soft X-rays is not evident over 5 years, despite the significant relativistic spin precession in the considered time span (∼ 25^\circ…