HST/STIS observations of the RW Aurigae bipolar jet: mapping the physical parameters close to the source

We present the results of new spectral diagnostic investigations applied to high-resolution long-slit spectra of the RW Aur bipolar jet obtained with HST/STIS. The spectra include the forbidden doublets [O I] 6300,6363 \AA, [S II] 6716,6731 \AA, and [N II] 6548, 6583 \AA that we utilized to determine electron density, electron temperature, hydrogen ionisation fraction, total hydrogen density, radial velocity and the mass outflow rate. We were able to extract the parameters as far as 3".9 in the red- and 2".1 in the blueshifted beam. The RW Aur jet appears to be the second densest outflow from a T Tauri star studied so far, but its other properties are quite similar to those found in other jets from young stars. The overall trend of the physical parameters along the first few arcseconds of the RW Aur jet is similar to that of HH 30 and DG Tau and this can reflect analogies in the mechanisms operating in that region, suggesting the same engine is accelerating the jets in the T Tauri stars with outflows. Our study of the RW Aur jet indicates for the first time that, despite the detected marked asymmetries in physical and kinematic properties between the two lobes, the mass outflow rates in the two lobes are similar. This appears to indicate that the central engine has constraining symmetries on both sides of the system, and that the observed asymmetries are probably due to different environmental conditions.Comment: 24 pages, 10 figures, accepted for publication in the Astronomy and Astrophysic

Search for direct production of charginos and neutralinos in events with three leptons and missing transverse momentum in √s = 7 TeV pp collisions with the ATLAS detector

A search for the direct production of charginos and neutralinos in final states with three electrons or muons and missing transverse momentum is presented. The analysis is based on 4.7 fb−1 of proton–proton collision data delivered by the Large Hadron Collider and recorded with the ATLAS detector. Observations are consistent with Standard Model expectations in three signal regions that are either depleted or enriched in Z-boson decays. Upper limits at 95% confidence level are set in R-parity conserving phenomenological minimal supersymmetric models and in simplified models, significantly extending previous results

Search for dark matter produced in association with a hadronically decaying vector boson in pp collisions at sqrt (s) = 13 TeV with the ATLAS detector

A search is presented for dark matter produced in association with a hadronically decaying W or Z boson using 3.2 fb−1 of pp collisions at View the MathML sources=13 TeV recorded by the ATLAS detector at the Large Hadron Collider. Events with a hadronic jet compatible with a W or Z boson and with large missing transverse momentum are analysed. The data are consistent with the Standard Model predictions and are interpreted in terms of both an effective field theory and a simplified model containing dark matter

Probabilistic functions and statistical equivalence of binary shift registers with random Markov input

We consider a binary non-autonomous shift register with a sequence of random variables connected into a simple homogeneous stationary Markov chain at the input. The expression is obtained for the probability function in the output sequence in the form of a fractional rational function, the arguments of which are the transition probabilities of the Markov chain. An equivalence relation arising in the case of the identical equality of the probability functions of the registers is described. The results known earlier for the case when the input sequence is a sequence of independent random variables are generalized. © 2020 Copyright for this paper by its authors. Use permitted under Creative Commons License Attribution 4.0 International (CC BY 4.0). CEUR Workshop Proceedings (CEUR-WS.org

On recognition of the shift register output function with a random input for a Markov model of an input sequence

The problem of recognizing the output function of a binary non-autonomous shift register is considered, the input of which receives a sequence of random variables connected in a simple homogeneous stationary Markov chain. The statistics of symbol frequencies in the output register sequence is used. The recognition problem is reduced to the form of integer minimization of the linear form module under linear constraints. The results are compared with the case when the input sequence is Bernoulli. © 2020 Copyright for this paper by its authors. Use permitted under Creative Commons License Attribution 4.0 International (CC BY 4.0). CEUR Workshop Proceedings (CEUR-WS.org

Polyhedra of finite state machines and their use in the identification problem

The possible sets of joint distribution of the word occurrence frequencies in the finite state machine input and output sequences are considered. A geometric description of such sets as convex polyhedra in a real unit cube of suitable dimension is proposed. A method has been developed for comparison of unknown and reference automata by the observed input and output sequence fragments. The method does not require installation to the fixed initial state. © Springer Nature Switzerland AG 2020

Search for dark matter in association with a Higgs boson decaying to b-quarks in pp collisions at root s=13 TeV with the ATLAS detector

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