Search Publications
Response of Hinode XRT to quiet Sun, active region and flare plasma
Mason, H. E.; Del Zanna, G.; O'Dwyer, B.
Aims: We examine the response of the Hinode X-Ray Telescope (XRT), using simultaneous observations with the Hinode Extreme-ultraviolet Imaging Spectrometer (EIS), for a flare, an active region and a quiet Sun region. We also examine the relative intensity calibration of EIS and XRT.
Methods: EIS differential emission measure distribution…
Astrometry of χ and H Persei Based on Processing of Digitized Plates of Archive of the Astronomical Institute of the Academy of Sciences of the Republic of Uzbekistan
Ehgamberdiev, Sh. A.; Muminov, M. M.; Yuldoshev, Q. X. +3 more
Work is done with Epson Expression 10000XL scanner of Astronomical Institute (AI) of the Academy of Sciences of Uzbekistan. The plates were exposed with the Normal astrograph (D/F = 330mm / 3467mm, M = 59.56"/mm). The digitization of plates with (16x16) cm in size was made with resolution of 1200 dpi (1px = 1.25"). Test research was done using pla…
Broad iron emission line and kilohertz quasi-periodic oscillations in the neutron star system 4U 1636-53
Hiemstra, Beike; Belloni, Tomaso; Méndez, Mariano +3 more
Both the broad iron (Fe) line and the frequency of the kilohertz quasi-periodic oscillations (kHz QPOs) in neutron star low-mass X-ray binaries (LMXBs) can potentially provide independent measures of the inner radius of the accretion disc. We use XMM-Newton and simultaneous Rossi X-ray Timing Explorer observations of the LMXB 4U 1636-53 to test th…
Herschel/PACS observations of the host galaxy of GRB 031203.
Page, M. J.; Symeonidis, M.; Schady, P. +6 more
We present Herschel/PACS observations of the nearby (z = 0.1055) dwarf galaxy that has hosted the long gamma-ray burst (LGRB) 031203. Using the PACS data, we have been able to place constraints on the dust temperature, dust mass, total infrared (IR) luminosity and IR-derived star formation rate (SFR) for this object. We find that the GRB host gala…
Multi-frequency study of DEM L299 in the Large Magellanic Cloud
Sasaki, Manami; Warth, Gabriele; Filipović, Miroslav D. +3 more
Aims: We have studied the H ii region
Methods: We performed a spectral analysis of archived XMM-Newton EPIC data and studied the morphology of
Chandra X-ray observation of the H ii region Gum 31 in the Carina nebula complex
Preibisch, T.; Ratzka, T.; Broos, P. +2 more
Context. Gum 31 is a prominent, but still rather poorly studied H ii region around the stellar cluster NGC 3324 at the northwestern periphery of the Carina nebula complex.
Aims: Our aim was to reveal and characterize the young stellar population in Gum 31. An X-ray survey is the only efficient way to identify young stars in this region with e…
How to distinguish between kink and sausage modes in flapping oscillations?
Kubyshkin, I. V.; Sergeev, V. A.; Semenov, V. S. +5 more
Flapping waves are most noticeable large-scale perturbations of the magnetotail current sheet, whose nature is still under discussion. They represent rather slow (an order of magnitude less than typical Alfven speed) waves propagating from the center of the sheet to its flanks with a typical speed of 20-60 km/s, amplitude of 1-2 Re and …
Absorption features in the quasar HS 1603 + 3820 II. Distance to the absorber obtained from photoionisation modelling
Różańska, A.; Hryniewicz, K.; Ebeling, H. +4 more
We present the photoionisation modelling of the intrinsic absorber in the bright quasar HS 1603 + 3820. We constructed the broad-band spectral energy distribution using the optical/UV/X-ray observations from different instruments as inputs for the photoionisation calculations. The spectra from the Keck telescope show extremely high CIV to HI ratio…
The innermost globular clusters of M87
Prieto, M. A.; Acosta-Pulido, J. A.; Fernández-Ontiveros, J. A. +1 more
We present a comprehensive multiwavelength photometric analysis of the innermost (∼3 × 3 kpc2) 110 globular clusters (GCs) of M87. Their spectral energy distributions (SEDs) were built taking advantage of new ground-based high-resolution near-infrared imaging aided by adaptive optics at the Very Large Telescope combined with Hubble Spac…
Weighing Neutrinos in f(R) Gravity in Light of BICEP2
Zhou, Xiao-Ying; He, Jian-Hua
We constrain the neutrino mass in f(R) gravity using the latest observations from the Planck, BAO and BICEP2 data. We find that the measurement on the B-modes can break the degeneracy between the massive neutrinos and the f(R) gravity. We find a non-zero value of the Compton wavelengths B0 at a 68% confidence level for the f(R) model in…