Search Publications
A comparison of anisotropic statistical properties of CMB maps based on the WMAP and planck space mission data
Verkhodanov, O. V.; Naiden, Ya. V.
We compare the anisotropic properties of the cosmic microwave background (CMB) maps constructed based on the data of NASA's WMAP (9th year of observations) and ESA's Planck (2015 release) space missions. In our analysis, we use two two-dimensional estimators of the scatter of the signal on a sphere, which amount to algorithms of mapping the ratio …
Foreshock ions observed behind the Martian bow shock
Coates, A. J.; Lundin, R.; Yamauchi, M. +4 more
The Mars Express Analyzer of Space Plasmas and Energetic Atoms experiment contains ion and electron instruments for conducting plasma measurements. On January 23, 2012, during in-bound travel of Mars Express in the southern hemisphere of Mars from its dawn side toward periapsis at dusk, the plasma instruments measured foreshock-like ion beams exte…
Coronal O VI emission observed with UVCS/SOHO during solar flares: Comparison with soft X-ray observations
Raymond, J. C.; Giordano, S.; Mancuso, S.
In this work, we derive the O VI 1032 Å luminosity profiles of 58 flares, during their impulsive phase, based on off-limb measurements by the Ultraviolet Coronagraph Spectrometer (UVCS) aboard the SOlar and Heliospheric Observatory (SOHO). The O VI luminosities from the transition region plasma (here defined as the region with temperatures 5.0 ≤ l…
2D photochemical model for forbidden oxygen line emission for comet 1P/Halley
Gunell, H.; Rubin, M.; De Keyser, J. +8 more
We present here a 2D model of photochemistry for computing the production and loss mechanisms of the O(1S) and O(1D) states, which are responsible for the emission lines at 577.7, 630, and 636.4 nm, in case of the comet 1P/Halley. The presence of O2 within cometary atmospheres, measured by the in situ Rosetta and G…
Dynamical structure of the multiple stellar system HD164492
González, J. F.; Veramendi, M. E.
HD 164492 is a Trapezium-like stellar system with one O-type and several early B-type components immersed in an active star forming region (M20). The relevance of this system has increased after the recent discovery that one of its visual components, HD 164492C, is a spectroscopic triple with a remarkable magnetic field. As a complement of those s…
Kinematic properties of the dual AGN system J0038+4128 based on long-slit spectroscopy
Huang, Yang; Liu, Xiao-Wei; Bai, Jin-Ming +2 more
The study of kiloparsec-scale dual active galactic nuclei (AGN) provides important clues for understanding the co-evolution between host galaxies and their central supermassive black holes undergoing a merging process. We present long-slit spectroscopy of J0038+4128, a kiloparsec-scale dual AGN candidate, discovered recently by Huang et al., using…
AMiBA: Cluster Sunyaev-Zel’dovich Effect Observations with the Expanded 13-element Array
Koch, Patrick M.; Umetsu, Keiichi; Ho, Paul T. P. +35 more
The Yuan-Tseh Lee Array for Microwave Background Anisotropy (AMiBA) is a co-planar interferometer array operating at a wavelength of 3 mm to measure the Sunyaev-Zel’dovich effect (SZE) of galaxy clusters at arcminute scales. The first phase of operation—with a compact 7-element array with 0.6 m antennas (AMiBA-7)—observed six clusters at angular s…
The Swift AGN and Cluster Survey. II. Cluster Confirmation with SDSS Data
Bregman, Joel N.; Kochanek, Christopher S.; Dai, Xinyu +1 more
We study 203 (of 442) Swift AGN and Cluster Survey extended X-ray sources located in the SDSS DR8 footprint to search for galaxy over-densities in three-dimensional space using SDSS galaxy photometric redshifts and positions near the Swift cluster candidates. We find 104 Swift clusters with a >3σ galaxy over-density. The remaining targets are p…
Fast inversion of Zeeman line profiles using central moments. II. Stokes V moments and determination of vector magnetic fields
Bommier, V.; Mein, P.; Mein, N. +2 more
Context. In the case of unresolved solar structures or stray light contamination, inversion techniques using four Stokes parameters of Zeeman profiles cannot disentangle the combined contributions of magnetic and nonmagnetic areas to the observed Stokes I.
Aims: In the framework of a two-component model atmosphere with filling factor f, we pr…
A new investigation of the possible X-ray counterparts of the magnetar candidate AX J1845-0258
Pintore, Fabio; Mereghetti, Sandro
AX J1845-0258 is a transient X-ray pulsar, with spin period of 6.97 s, discovered with the ASCA satellite in 1993. Its soft spectrum and the possible association with a supernova remnant suggest that AX J1845-0258 might be a magnetar, but this has not been confirmed yet. A possible counterpart one order of magnitude fainter, AX J184453-025640, has…