Search Publications
Observations of the γ-ray pulsar J1932+1916 in X-rays
Shternin, P.; Zyuzin, D.; Danilenko, A. +2 more
We present the analysis of the archival Suzaku and Swift X-ray observations of the young γ-ray pulsar J1932+1916 field. The data revealed a point-like object at the γ-ray position of the pulsar and diffuse X-ray emission around it. Spectra of the point-like source and diffuse emission are well-described by absorbed power-law models with spectral p…
On a correlation among azimuthal velocities and the flyby anomaly sign
Acedo, L.; Bel, Ll.
Data of six flybys, those of Galileo I, Galileo II, NEAR, Cassini, Rosetta, and Messenger were reported by Anderson et al. (2008). Four of them: Galileo I, NEAR, Rosetta, and Messenger gain Newtonian energy during the flyby transfer, while Galileo II and Cassini lose energy. In both cases this is a surprising anomaly since Newtonian forces origina…
Optical spectroscopy of candidates for quasars at 3 < z < 5.5 from the XMM-newton X-ray survey. A distant X-ray quasar at z = 5.08
Sazonov, S. Yu.; Eselevich, M. V.; Khorunzhev, G. A. +2 more
We present the results of optical spectroscopy for 19 quasar candidates at photometric redshifts z phot ≳ 3, 18 of which enter into the Khorunzhev et al. (2016) catalog (K16). This is a catalog of quasar candidates and known type 1 quasars selected among the X-ray sources of the 3XMM-DR4 catalog of the XMM-Newton serendipitous survey. W…
The nature of X-ray spectral variability in MCG-6-30-15
Papadakis, I. E.; Kammoun, E. S.
The flux-flux plot (FFP) method can provide model-independent clues regarding the X-ray variability of active galactic nuclei. To use it properly, the bin size of the light curves should be as short as possible, provided the average counts in the light-curve bins are larger than ∼200. We apply the FFP method, performed in 2013, to the simultaneous…
Multiple X-ray bursts and the model of a spreading layer of accreting matter over the neutron star surface
Grebenev, S. A.; Chelovekov, I. V.
We report the detection of series of close type I X-ray bursts consisting of two or three events with a recurrence time much shorter than the characteristic (at the observed mean accretion rate) time of matter accumulation needed for a thermonuclear explosion to be initiated on the neutron star surface during the JEM-X/INTEGRAL observations of sev…
Vertical Thermospheric Density Profiles From EUV Solar Occultations Made by PROBA2 LYRA for Solar Cycle 24
Dominique, M.; Eparvier, F. G.; Thiemann, E. M. B. +1 more
A new data set of summed neutral N2 and O number density profiles, spanning altitudes between 150 and 400 km, and observed during Northern Winter from 2010 to 2016 is presented. The neutral density profiles are derived from solar occultation measurements made by the 0.1-20 nm Zr channel on the Large Yield Radiometer (LYRA) instrument on…
Search for HBr and bromine photochemistry on Venus
Krasnopolsky, Vladimir A.; Belyaev, Denis A.
HBr (1-0) R2 2605.8/6.2 cm-1, the strongest line of the strongest band of HBr, was observed when searching for this species on Venus. The observation was conducted using the NASA IRTF and a high-resolution long-slit spectrograph CSHELL with resolving power of 4 × 104. 101 spectra of Venus were analyzed, and the retrieved HBr …
Initial In-flight Results: The Total Solar Irradiance Monitor on the FY-3C Satellite, an Instrument with a Pointing System
Wang, Hongrui; Li, Huiduan; Qi, Jin +1 more
The total solar irradiance (TSI) has been recorded daily since October 2013 by the Total Solar Irradiance Monitor (TSIM) onboard the FY-3C satellite, which is mainly designed for Earth observation. The TSIM has a pointing system to perform solar tracking using a sun sensor. The TSI is measured by two electrical substitution radiometers with tracea…
Orbital variations and outbursts of the unusual variable star V1129 Centauri
Bruch, Albert
The variable star V1129 Cen is classified in the GCVS as being of β Lyr type. Unusual for such stars, it exhibits outbursts roughly once a year, lasting for ∼ 40 days. For this reason, a relationship to the dwarf novae has been suspected. Here, for the first time a detailed analysis of the light curve of the system is presented. Based on observati…
Frequency fluctuations in the solar corona investigated with radio sounding experiments on the spacecraft ROSETTA and MARS EXPRESS in 2010/2011
Pätzold, M.; Bird, M. K.; Efimov, A. I. +3 more
Coronal radio-sounding experiments were carried out using two-way coherent dual-frequency carrier signals of the ESA spacecraft ROSETTA in 2010 and MARS EXPRESS in 2010/2011. Differential frequency measurements recorded at both NASA and ESA tracking stations (sample rate: 1 Hz) are analyzed in this paper. Spectral analysis of the S-band, X-band, a…