Astronomical Data Analysis Software and Systems X

Hanisch, R. J.; Jacoby, George H.

doi:10.1086/320803

Cited by 114 publications

(122 citation statements)

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“…To perform the X-ray spectral analysis in the energy range 0.3-10.0 keV , we have used version-12.12.0 (Arnaud 1996;Dorman & Arnaud 2001). In general, the X-ray spectrum of polars is explained by a soft blackbody-like emission component superimposed on a multi-temperature thermal plasma emission along with an absorption component.…”

Section: Optical and X-ray Spectroscopymentioning

confidence: 99%

Confirmation of two magnetic cataclysmic variables as polars: 1RXS J174320.1−042953 and YY Sex

Rawat

Pandey

Joshi

et al. 2023

Monthly Notices of the Royal Astronomical Society

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We present our analysis of new and archived observations of two candidate magnetic cataclysmic variables, namely 1RXS J174320.1-042953 and YY Sex. 1RXS J174320.1-042953 was observed in two distinctive high and low states where a phase shift was seen, which could be due to the changes in the shape, size, and (or) location of the accretion region. We find that its orbital X-ray modulations only persist in the soft (0.3-2.0 keV) energy band, which could be attributed to the photoelectric absorption in the accretion flow. The X-ray spectra exhibit a multi-temperature post-shock region where the hard X-rays are absorbed through a thick absorber with an equivalent hydrogen column of ∼7.5 × 1023 cm−2, which partially covers ∼56 per cent of the emission. No soft X-ray excess was found to be present; however, a soft X-ray emission with a blackbody temperature of ∼97 eV describes the spectra. Extensive TESS observations of YY Sex allow us to refine its orbital period to 1.5746 ± 0.0011 h. We did not find any signature of previously reported spin or beat periods in this system. Furthermore, our new polarimetric observations show clear circular polarization modulated on the orbital period only. Finally, both systems show strong Balmer and He II 4686 Å emission lines in the optical spectra, further indicative of their magnetic nature.

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Section: Optical and X-ray Spectroscopymentioning

confidence: 99%

Confirmation of two magnetic cataclysmic variables as polars: 1RXS J174320.1−042953 and YY Sex

Rawat

Pandey

Joshi

et al. 2023

Monthly Notices of the Royal Astronomical Society

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“…A systematic uncertainty of 2% was also introduced during the spectral fitting (Antia et al 2017;Sharma et al 2020). We used (Arnaud 1996) for the spectral fitting with the component tbabs to model interstellar neutral hydrogen absorption (Wilms et al 2000).…”

Section: Broadband Spectral Analysismentioning

confidence: 99%

AstroSat observation of the accreting millisecond X-ray pulsar SAX J1808.4–3658 during its 2019 outburst

Sharma

Sanna

Beri

2022

Monthly Notices of the Royal Astronomical Society

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We report on the analysis of the AstroSat dataset of the accreting millisecond X-ray pulsar SAX J1808.4-3658, obtained during its 2019 outburst. We found coherent pulsations at ∼401 Hz and an orbital solution consistent with previous studies. The 3–20 keV pulse profile can be well fitted with three harmonically related sinusoidal components with background-corrected fractional amplitude of $\sim 3.5 \%$, $\sim 1.2 \%$ and $\sim 0.37 \%$ for fundamental, second and third harmonic, respectively. Our energy-resolved pulse profile evolution study indicate a strong energy dependence. We also observed a soft lag in fundamental and hard lag during its harmonic. The broadband spectrum of SAX J1808.4-3658 can be well described with a combination of thermal emission component with kT ∼ 1 keV, a thermal Comptonization (Γ ∼ 1.67) from the hot corona and broad emission lines due to Fe.

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“…Astronomical data have certain characteristics, such as large amounts of data, real-time requirements [11], complicated calculation processes [12], heterogeneous calculation nodes [13], diverse storage models, various data access patterns [14], high expansibility, etc. High performance computing, distributed computing, parallel computing, uniform resource management, container technology and telescope observation control system technology are needed [15]. Current related technologies, such as Apache Hadoop, OpenMP, MPI, etc., all face various problems in processing astronomical data [16].…”

Section: Introductionmentioning

confidence: 99%

Data Processing Scheme Based on Blockchain

Xu²,

Huang

et al. 2020

Preprint

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In the white paper written on Bitcoin, a chain of blocks was proposed by Satoshi Nakamoto. Since then, blockchain has been rapidly developed. Blockchain is not only limited to the field of cryptocurrency but also has been extensively applied to the Internet of Things (IoT), supply chain finance, electronic evidence storage, data sharing, and e-government fields. Both the public chain and the alliance chain have been extensively developed. In the data processing field, blockchain has a particularly good application potential. The Square Kilometre Array (SKA) is a proposal consisting of a joint venture of more than ten countries, resulting in the world’s largest synthetic aperture radio telescope. In the SKA, the processing scale of the data is large, and it consists of several data processing nodes. The data will be processed in the cloud computing mode. Taking the SKA under consideration, this report proposes a data processing scheme based on blockchain for the anti-counterfeiting, anti-tampering and traceability of data. Furthermore, the authenticity and integrity of the data are assured. The primary aspects include data distribution, data operation and data sharing, which correspond to the data reception, data algorithm processing and result sharing of data operation in the SKA. With this process, the integrity, reliability and authenticity of the data are guaranteed. Additionally, smart contracts, homomorphic hashing, secure containers, aggregate signatures and one-way encrypted channels are implemented to ensure the intelligence, security and high performance of the process.

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Astronomical Data Analysis Software and Systems X

Cited by 114 publications

References 0 publications

Confirmation of two magnetic cataclysmic variables as polars: 1RXS J174320.1−042953 and YY Sex

Confirmation of two magnetic cataclysmic variables as polars: 1RXS J174320.1−042953 and YY Sex

AstroSat observation of the accreting millisecond X-ray pulsar SAX J1808.4–3658 during its 2019 outburst

Data Processing Scheme Based on Blockchain

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