Here we explore the disk-jet connection in the broad-line radio quasar 4C+74.26, utilizing the results of the multiwavelength monitoring of the source. The target is unique in that its radiative ...output at radio wavelengths is dominated by a moderately-beamed nuclear jet, at optical frequencies by the accretion disk, and in the hard X-ray range by the disk corona. Our analysis reveals a correlation (local and global significance of 96\% and 98\%, respectively) between the optical and radio bands, with the disk lagging behind the jet by \(250 \pm 42\) days. We discuss the possible explanation for this, speculating that the observed disk and the jet flux changes are generated by magnetic fluctuations originating within the innermost parts of a truncated disk, and that the lag is related to a delayed radiative response of the disk when compared with the propagation timescale of magnetic perturbations along relativistic outflow. This scenario is supported by the re-analysis of the NuSTAR data, modelled in terms of a relativistic reflection from the disk illuminated by the coronal emission, which returns the inner disk radius \(R_{\rm in}/R_{\rm ISCO} =35^{+40}_{-16}\). We discuss the global energetics in the system, arguing that while the accretion proceeds at the Eddington rate, with the accretion-related bolometric luminosity \(L_{\rm bol} \sim 9 \times 10^{46}\) erg s\(^{-1}\) \(\sim 0.2 L_{\rm Edd}\), the jet total kinetic energy \(L_\textrm{j} \sim 4 \times 10^{44}\) erg s\(^{-1}\), inferred from the dynamical modelling of the giant radio lobes in the source, constitutes only a small fraction of the available accretion power.
We report on the analysis of 34 years of photometric observations of the pulsating helium atmosphere white dwarf GD358. The complete data set includes archival data from 1982-2006, and 1195.2 hours ...of new observations from 2007- 2016. From this data set, we extract 15 frequencies representing g-mode pulsation modes, adding 4 modes to the 11 modes known previously. We present evidence that these 15 modes are ell = 1 modes, 13 of which belong to a consecutive sequence in radial overtone k. We perform a detailed asteroseismic analysis using models that include parameterized, complex carbon and oxygen core composition profiles to fit the periods. Recent spectroscopic analyses place GD358 near the red edge of the DBV instability strip, at 24,000 plus or minus 500 K and a log g of 7.8 plus or minus 0.08 dex. The surface gravity translates to a mass range of 0.455 to 0.540 solar masses. Our best fit model has a temperature of 23,650 K and a mass of 0.5706 solar masses. That is slightly more massive than suggested by most the recent spectroscopy. We find a pure helium layer mass of 10^-5.50, consistent with the result of previous studies and the outward diffusion of helium over time.
The experiment was conducted on sheep receiving NH4Cl infusions into v. mesentericta anterior. During first 3 h animals received ammonia in a dose of 13 mumol X min-1 X kg body wt.-1 and then next 3 ...h in a dose of 30 mumol X min-1 X kg body wt.-1. When ammonia was administered in smaller doses its concentration increased to 0.65 and 0.22 mmol/l in portal and peripheral blood, respectively. Simultaneous slight increase of ATP and marked of 2,3-diphosphoglycerate (2,3-DPG) was observed. These effects of moderate ammonia loading are probably caused by the rise of glucose utilization in erythrocytes. Ammonia given in a higher dose induced further rise of its concentration to 1.1 and 0.51 mmol/l in portal and peripheral blood, respectively. Such NH4Cl infusion caused a further rise of 2,3-DPG concentration connected with the drop of ATP level in ovine red blood cells. It seems that a decrease of ATP level was mainly the result of local high 2,3-DPG level which inhibits glycolytic enzymes.
Detection of periodicity in the broad-band non-thermal emission of blazars has so far been proven to be elusive. However, there are a number of scenarios which could lead to quasi-periodic variations ...in blazar light curves. For example, orbital or thermal/viscous period of accreting matter around central supermassive black holes could, in principle, be imprinted in the multi-wavelength emission of small-scale blazar jets, carrying as such crucial information about plasma conditions within the jet launching regions. In this paper, we present the results of our time series analysis of \(\sim 9.2\) year-long, and exceptionally well-sampled optical light curve of the BL Lac OJ 287. The study primarily uses the data from our own observations performed at the Mt. Suhora and Kraków Observatories in Poland, and at the Athens Observatory in Greece. Additionally, SMARTS observations were used to fill in some of the gaps in the data. The Lomb-Scargle Periodogram and the Weighted Wavelet Z-transform methods were employed to search for the possible QPOs in the resulting optical light curve of the source. Both the methods consistently yielded possible quasi-periodic signal around the periods of \(\sim 400\) and \(\sim 800\) days, the former one with a significance (over the underlying colored noise) of \(\geq 99\%\). A number of likely explanations for such are discussed, with a preference given to a modulation of the jet production efficiency by highly magnetized accretion disks. This supports the previous findings and the interpretation reported recently in the literature for OJ 287 and other blazar sources.
We investigated the inhibitory regulation of perceptual–motor processing streams in a task that switched between spatially compatible and incompatible stimulus–response mappings. Thirty male and ...female college‐aged participants performed a reaction time (RT) task in which the response was either spatially compatible or not depending on a cue immediately preceding the stimulus. The cue‐to‐stimulus interval (CI) was either 50 or 500 ms. Incompatible mapping yielded the typical slower responses than compatible mapping at 500 ms, but not at 50 ms. Changes in cardiac interbeat interval (IBI) and performance suggested that automatic responses to compatible stimuli were suppressed at 50 ms. Both performance and IBI changes as well as individual differences in these measures suggested a precue preparatory schema or set biased toward suppressing the compatible mapping. An alternate hypothesis of a cue‐induced suppression was questioned. The results illustrate the operation of different supervisory processes in the anticipatory and online control of action.
The studies concerned the influence of ammonia ion on fresh sheep erythrocytes incubated in a buffer containing glucose, sodium phosphate and adenosine. The addition of NH4Cl to the erythrocytes ...increased their glucose metabolism and elevated concentration of adenosine triphosphate and 2,3 dipophosphoglycrate. No significant changes in the content of erythrocyte methaemoglobin and glutathione were observed
The urinary excretion of orotic acid in diabetic rabbits Motyl, T. (Warsaw Agricultural University (Poland). Veterinary Faculty. Department of Animal Physiology); Debski, B
Journal of veterinary medicine. Series A,
03/1988, Letnik:
35, Številka:
3
Journal Article
