Search Publications
X-Ray Constraints on the Spectral Energy Distribution of the z = 5.18 Blazar SDSS J013127.34-032100.1
An, Hongjun; Romani, Roger W.
We report on X-ray measurements constraining the spectral energy distribution (SED) of the high-redshift z = 5.18 blazar SDSS J013127.34-032100.1 with new XMM-Newton and NuSTAR exposures. The blazar's X-ray spectrum is well fit by a power law with Γ = 1.9 and ${N}_{{\rm{H}}}=1.1\times {10}^{21}\,{\mathrm{cm}}^{-2}$ , or a broken power law with ${{…
A low-mass stellar companion to the young variable star RZ Psc
Henning, Thomas; Ménard, François; Kral, Quentin +10 more
RZ Psc is a young Sun-like star with a bright and warm infrared excess that is occasionally dimmed significantly by circumstellar dust structures. Optical depth arguments suggest that the dimming events do not probe a typical sightline through the circumstellar dust, and are instead caused by structures that appear above an optically thick mid-pla…
Dipolar and Kelvin-Stuart's cat's eyes vortices in magnetoplasmas with non-Maxwellian electron distribution
Masood, W.; Naeem, Ismat; Mirza, Arshad M.
Linear and nonlinear propagation characteristics of drift ion acoustic waves are analyzed in an inhomogeneous plasma comprising of warm ions having shear flow parallel to the magnetic field and electrons that are followed by a distribution which is dictated by spectral indices,
Structural insights into the mechanism of rhodopsin phosphodiesterase
Ikuta, Tatsuya; Shihoya, Wataru; Sugiura, Masahiro +9 more
Rhodopsin phosphodiesterase (Rh-PDE) is an enzyme rhodopsin belonging to a recently discovered class of microbial rhodopsins with light-dependent enzymatic activity. Rh-PDE consists of the N-terminal rhodopsin domain and C-terminal phosphodiesterase (PDE) domain, connected by 76-residue linker, and hydrolyzes both cAMP and cGMP in a light-dependen…
Infrared Color Separation between Thin-shelled Oxygen-rich and Carbon-rich AGB Stars
Sjouwerman, Loránt O.; Pihlström, Ylva M.; Lewis, Megan O. +1 more
We present 43 GHz VLA spectra for 51 AGB sources with the goal of verifying an infrared (IR) color cut intended to separate carbon-rich (C) and oxygen-rich (O) AGB sources throughout the Galaxy. The color cut is a simple line in the [Ks] - [A] versus [A] - [E] color-color diagram based on 2MASS and MSX photometry, and was originally der…
Luminous blue variable candidates in M31
Vinokurov, A.; Solovyeva, Y.; Bizyaev, D. +7 more
We study five luminous blue variable (LBV) candidates in the Andromeda galaxy and one more (MN112) in the Milky Way. We obtain the same-epoch near-infrared (NIR) and optical spectra on the 3.5-m telescope at the Apache Point Observatory and on the 6-m telescope of the SAO RAS. The candidates show typical LBV features in their spectra: broad and st…
A deep X-ray spectral imaging of the bow-shock pulsar wind nebula associated with PSR B1929+10
Takata, J.; Hui, C. Y.; Lin, L. C. C. +3 more
In this work, we study the X-ray bow-shock nebula powered by the mature pulsar PSR B1929+10 using data from XMM-Newton, with an effective exposure of ∼300 ks, offering the deepest investigation of this system thus far. We found the X-ray axial outflow extends as long as ∼8 arc minute behind the proper motion direction, which is a factor of two lon…
Estimates of Extragalactic Background and Confusion Noise Parameters for the Millimetron Telescope
Pilipenko, S. V.; Ermash, A. A.; Lukash, V. N.
The sensitivity of future far-infrared telescopes, such as Millimetron, will be limited by the confusion noise produced by distant galaxies. We have constructed a model of the cosmic infrared background whose main goal is to investigate the confusion noise parameters. The model is based on the publicly accessible eGALICS simulation. For each galax…
Tomography of cool giant and supergiant star atmospheres. III. Validation of the method on VLTI/AMBER observations of the Mira star S Ori
Anderson, Richard I.; Kravchenko, Kateryna; Chiavassa, Andrea +5 more
Context. Asymptotic giant branch (AGB) stars are characterized by substantial mass loss, however the mechanism behind it not yet fully understood. The knowledge of the structure and dynamics of AGB-star atmospheres is crucial to better understanding the mass loss. The recently established tomographic method, which relies on the design of spectral …
Distinct Accretion Modes of Cygnus X-1 Revealed from Hard X-Rays
Zdziarski, Andrzej A.; Lubiński, Piotr; Pooley, Guy +1 more
Thanks to recurrent observations of the black hole binary Cyg X-1 carried out over 15 years the INTEGRAL satellite has collected the largest data set in the hard X-ray band for this source. We have analyzed these data, complemented by data collected by other X-ray satellites and radio flux at 15 GHz. To characterize the spectral and variability pr…