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Optical identification of hard X-ray source IGRJ18257-0707
R. A. Burenin, I. F. Bikmaev, M. G. Revnivtsev +4
We present the results of the optical identification of hard X-ray source IGRJ18257-0707 trough the spectroscopic observations of its optical counterpart with RTT150 telescope. Acc…
Time-Dependent Corrections to the Ly-alpha Escape Probability During Cosmological Hydrogen Recombination
J. Chluba, R. A. Sunyaev
We consider the effects connected with the detailed radiative transfer during the epoch of cosmological recombination on the ionization history of our Universe. We focus on the esc…
Fine-structure infrared lines from the Cassiopeia A knots
D. Docenko, R. A. Sunyaev
Aims: Archival observations of infrared fine-structure lines of the young Galactic supernova remnant Cassiopeia A allow us to test existing models and determine the physical parame…
Carbon monoxide line emission as a CMB foreground: tomography of the star-forming universe with different spectral resolutions
Mattia Righi, Carlos Hernandez-Monteagudo, Rashid Sunyaev
The rotational lines of carbon monoxide and the fine structure lines of CII and of the most abundant metals, emitted during the epoch of enhanced star formation in the universe, ar…
Evolution of low-frequency features in the CMB spectrum due to stimulated Compton scattering and Doppler-broadening
J. Chluba, R. A. Sunyaev
We discuss a new solution of the Kompaneets-equation for physical situations in which low frequency photons, forming relatively narrow spectral details, are Compton scattered in an…
Optical and near-infrared recombination lines of oxygen ions from Cassiopeia A knots
D. Docenko, R. A. Sunyaev
Context. Fast-moving knots (FMK) in the Galactic supernova remnant Cassiopeia A consist mainly of metals and allow to study element production in supernovae and shock physics in gr…
Pre-recombinational energy release and narrow features in the CMB spectrum
J. Chluba, R. A. Sunyaev
Energy release in the early Universe (z<~ 2x10^6) should lead to some broad spectral distortion of the cosmic microwave background (CMB) radiation field, which can be characterized…
Width of X-ray lines in cooling flows
P. Rebusco, E. Churazov, R. A. Sunyaev +2
The dissipation of turbulent gas motions is one of the likely mechanisms that has been proposed to heat the intracluster medium (ICM) in the cores of clusters and groups of galaxie…
Lines in the cosmic microwave background spectrum from the epoch of cosmological helium recombination
J. A. Rubino-Martin, J. Chluba, R. A. Sunyaev
The main goal of this work is to calculate the contributions to the cosmological recombination spectrum due to bound-bound transitions of helium. We show that due to the presence o…
Broad Lyman-Alpha Emission from Supernova Remnants in Young Galaxies
Kevin Heng, Rashid Sunyaev
Charge transfer (or exchange) reactions between hydrogen atoms and protons in collisionless shocks of supernova remnants (SNRs) are a natural way of producing broad Balmer, Lyman a…
The Richness and Beauty of the Physics of Cosmological Recombination
R. A. Sunyaev, J. Chluba
The physical ingredients to describe the epoch of cosmological recombination are amazingly simple and well-understood. This fact allows us to take into account a very large variety…
The clustering of merging star-forming haloes: dust emission as high frequency arcminute CMB foreground
Mattia Righi, Carlos Hernandez-Monteagudo, Rashid Sunyaev
Future observations of CMB anisotropies will be able to probe high multipole regions of the angular power spectrum, corresponding to a resolution of a few arcminutes. Dust emission…
Is there a need and another way to measure the Cosmic Microwave Background temperature more accurately?
J. Chluba, R. A. Sunyaev
The recombination history of the Universe depends exponentially on the temperature, T_0, of the cosmic microwave background. Therefore tiny changes of T_0 are expected to lead to s…
Two-photon transitions in hydrogen and cosmological recombination
J. Chluba, R. A. Sunyaev
We study the two-photon process for the transitions ns --> 1s and nd --> 1s in hydrogen up to large n. For n<=20 we provide simple analytic fitting formulae to describe the non-res…
Cosmological hydrogen recombination: Lyn line feedback and continuum escape
J. Chluba, R. A. Sunyaev
We compute the corrections to the cosmological hydrogen recombination history due to delayed feedback of Lyman-series photons and the escape in the Lyman-continuum. The former proc…
Extensive multiband study of the X-ray rich GRB 050408. A likely off-axis event with an intense energy injection
A de Ugarte Postigo, T. A. Fatkhullin, G. Johannesson +40
Aims. Understand the shape and implications of the multiband light curve of GRB 050408, an X-ray rich (XRR) burst. Methods. We present a multiband optical light curve, covering the…
X-rays from cusps of compact remnants near galactic centres
Sergei Nayakshin, Rashid Sunyaev
Compact remnants -- stellar mass black holes and neutron stars formed in the inner few parsec of galactic centres are predicted to sink into the central parsec due to dynamical fri…
The double Compton emissivity in a mildly relativistic thermal plasma within the soft photon limit
J. Chluba, S. Yu. Sazonov, R. A. Sunyaev
We provide simple and accurate analytic approximations for the low frequency double Compton emission coefficient that are applicable in a broad range of physical situations up to m…
INTEGRAL Observations of SS433: Analysis of Precessional and Orbital X-ray Periodicities
A. M. Cherepashchuk, R. A. Sunyaev, E. V. Seifina +7
Hard X-ray INT observations of SS 433 carried out during 2003-2005 years with an analysis of precessional and orbital variability is presented. The width of X-ray eclipse in the 25…
Free-bound emission from cosmological hydrogen recombination
J. Chluba, R. A. Sunyaev
In this paper we compute the emission coming from the direct recombination of free electrons to a given shell (n>=2) during the epoch of cosmological hydrogen recombination. This c…
Earth X-ray albedo for cosmic X-ray background radiation in the 1--1000 keV band
E. Churazov, S. Sazonov, R. Sunyaev +1
We present calculations of the reflection of the cosmic X-ray background (CXB) by the Earth's atmosphere in the 1--1000 keV energy range. The calculations include Compton scatterin…
INTEGRAL observations of the cosmic X-ray background in the 5-100 keV range via occultation by the Earth
E. Churazov, R. Sunyaev, M. Revnivtsev +32
We study the spectrum of the cosmic X-ray background (CXB) in energy range 5-100 keV. Early in 2006 the INTEGRAL observatory performed a series of four 30ksec observations wi…
Cosmological hydrogen recombination: populations of the high level sub-states
J. Chluba, J. A. Rubino-Martin, R. A. Sunyaev
We present results for the spectral distortions of the Cosmic Microwave Background (CMB) arising due to bound-bound transitions during the epoch of cosmological hydrogen recombinat…
Lines in the Cosmic Microwave Background Spectrum from the Epoch of Cosmological Hydrogen Recombination
J. A. Rubino-Martin, J. Chluba, R. A. Sunyaev
We compute the spectral distortions of the Cosmic Microwave Background (CMB) arising during the epoch of cosmological hydrogen recombination within the standard cosmological (conco…