Search Publications
Detection of Hα emission from z > 3.5 submillimetre luminous galaxies with AKARI-FUHYU spectroscopy
Oyabu, Shinki; Smail, Ian; Pearson, Chris +9 more
We present tentative Hα emission line detections of four submillimetre-detected galaxies at z > 3.5: the radio galaxies 8C1909+722 and 4C60.07 at signal-to-noise ratios (SNRs) of 3.1 and 2.5, and two submillimetre-selected galaxies (SMGs) near the first of these at SNRs of 10.0 and 2.4, made with the AKARI space telescope as part of the Follow-…
Astrometric mock observations for determining the local dark matter density
Inoue, S.; Gouda, N.
Context. To determine the local dark matter density of the solar system is a classical problem in astronomy. Recently, a novel method of determining the local dark matter density from stellar distribution and vertical velocity dispersion profiles perpendicular to the Galactic plane was devised. This method has the advantage of abolishing conventio…
Study of the late nitrogen-sequence Galactic Wolf-Rayet star WR156. Spectropolarimetry and modeling
Afanasiev, V. L.; Panchuk, V. E.; Maryeva, O. V.
For the first time spectropolarimetric observations of Wolf-Rayet star WR156 (WN8h sub-class) were conducted. Medium resolution spectropolarimetric data in the range of 3500-7200 ÅÅ were obtained at 6-m BTA telescope of Special Astrophysical Observatory RAS (SAO RAS) using recently commissioned SCORPIO-2 spectrograph. These data show that the ligh…
X-ray view of four high-luminosity Swift/BAT AGN: Unveiling obscuration and reflection with Suzaku
Malaguti, G.; Mushotzky, R. F.; Koss, M. +2 more
Aims: A complete census of obscured active galactic nuclei (AGN) is necessary to reveal the history of the super massive black hole (SMBH) growth and galaxy evolution in the Universe given the complex feedback processes and the fact that much of this growth occurs in an obscured phase. In this context, hard X-ray surveys and dedicated follow-…
A photospheric metal line profile analysis of hot DA white dwarfs with circumstellar material
Barstow, M. A.; Welsh, B. Y.; Dickinson, N. J.
Some hot DA white dwarfs have circumstellar high ion absorption features in their spectra, in addition to those originating in the photosphere. In many cases, the line profiles of these absorbing components are unresolved. Given the importance of the atmospheric composition of white dwarfs to studies of stellar evolution, extra-solar planetary sys…
The vertical structure of the F ring of Saturn from ring-plane crossings
Nicholson, Philip D.; Scharringhausen, Britt R.
We present a photometric model of the rings of Saturn which includes the main rings and an F ring, inclined to the main rings, with a Gaussian vertical profile of optical depth. This model reproduces the asymmetry in brightness between the east and west ansae of the rings of Saturn that was observed by the Hubble Space Telescope (HST) within a few…
Current Sheet Regulation of Solar Near-relativistic Electron Injection Histories
Lario, D.; Vainio, R.; Dalla, S. +2 more
We present a sample of three large near-relativistic (>50 keV) electron events observed in 2001 by both the ACE and the Ulysses spacecraft, when Ulysses was at high-northern latitudes (>60°) and close to 2 AU. Despite the large latitudinal distance between the two spacecraft, electrons injected near the Sun reached both heliospheric location…
Coronal magnetic topology and the production of solar impulsive energetic electrons
Li, C.; Wang, X. Y.; Sun, L. P. +1 more
We investigate two candidate solar sources or active regions (ARs) in association with a solar impulsive energetic electron (SIEE) event on 2002 October 20. The solar particle release (SPR) times of SIEEs are derived by using their velocity dispersion with consideration of the instrumental effect. It is found that there are double electron injecti…
Multiwavelength studies of Markarian galaxies
Mickaelian, A. M.; Abrahamyan, H. V.; Paronyan, G. M. +1 more
Markarian galaxies are the result of the First Byurakan Survey (FBS) conducted in 1965-1980 by B.E. Markarian et al. The sample consists of 1515 UV-excess galaxies containing many active galaxies, both AGN and starburst (SB) galaxies that are interesting from the point of view of galaxy evolution and multiwavelength studies. Several catalogs of Ma…
Characteristics of the Taylor microscale in the solar wind/foreshock: magnetic field and electron velocity measurements
Fazakerley, A. N.; Gurgiolo, C.; Goldstein, M. L. +2 more
The Taylor microscale is one of the fundamental turbulence scales. Not easily estimated in the interplanetary medium employing single spacecraft data, it has generally been studied through two point correlations. In this paper we present an alternative, albeit mathematically equivalent, method for estimating the Taylor microscale (λT). …