Astrophysical Journal Supplement Series最新文献

{"title":"A Self-gravity Module for the PLUTO Code","authors":"Ankush Mandal, Dipanjan Mukherjee, Andrea Mignone","doi":"10.3847/1538-4365/aced0a","DOIUrl":"https://doi.org/10.3847/1538-4365/aced0a","url":null,"abstract":"Abstract We present a novel implementation of an iterative solver for the solution of Poisson’s equation in the PLUTO code for astrophysical fluid dynamics. Our solver relies on a relaxation method in which convergence is sought as the steady-state solution of a parabolic equation, whose time discretization is governed by the Runge–Kutta–Legendre (RKL) method. Our findings indicate that the RKL-based Poisson solver, which is both fully parallel and rapidly convergent, has the potential to serve as a practical alternative to conventional iterative solvers such as the Gauss–Seidel and successive overrelaxation methods. Additionally, it can mitigate some of the drawbacks of these traditional techniques. We incorporate our algorithm into a multigrid solver to provide a simple and efficient gravity solver that can be used to obtain the gravitational potentials in self-gravitational hydrodynamics. We test our implementation against a broad range of standard self-gravitating astrophysical problems designed to examine different aspects of the code. We demonstrate that the results match excellently with analytical predictions (when available), and the findings of similar previous studies.","PeriodicalId":8588,"journal":{"name":"Astrophysical Journal Supplement Series","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135304744","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"An XMM-Newton View of the Andromeda Galaxy as Explored in a Legacy Survey (New-ANGELS). I. The X-Ray Source Catalog","authors":"Rui Huang, Jiang-Tao Li, Wei Cui, Joel N. Bregman, Xiang-Dong Li, Gabriele Ponti, Zhijie Qu, Q. Daniel Wang, Yi Zhang","doi":"10.3847/1538-4365/ace4b8","DOIUrl":"https://doi.org/10.3847/1538-4365/ace4b8","url":null,"abstract":"Abstract We introduce the New-ANGELS program, an XMM-Newton survey of a ∼7.2 deg 2 area around M31, which aims to study the X-ray populations in the M31 disk and the X-ray-emitting hot gas in the inner halo of M31 up to 30 kpc. In this first paper, we report the catalog of 4506 detected X-ray sources and attempt to cross-identify or roughly classify them. We identify 352 single stars in the foreground, 35 globular clusters, and 27 supernova remnants associated with M31, as well as 62 active galactic nuclei, 59 galaxies, and one galaxy cluster in the background. We uniquely classify 236 foreground stars and 17 supersoft sources based on their X-ray colors. X-ray binaries (83 low-mass and one high-mass) are classified based on their X-ray colors and X-ray variabilities. The remaining X-ray sources either have too low signal-to-noise ratios to calculate their X-ray colors or do not have a unique classification, so are regarded as unclassified. The X-ray source catalog is published online. Studies of the X-ray source populations and the contribution of X-ray sources in the unresolved X-ray emissions based on this catalog will be published in companion papers.","PeriodicalId":8588,"journal":{"name":"Astrophysical Journal Supplement Series","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135737912","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A White Dwarf Search Model Based on a Deep Transfer-learning Method","authors":"Lei 磊 Tan 谈, Zhicun 志 存 Liu 柳, Feng 锋 Wang 王, Ying 盈 Mei 梅, Hui 辉 Deng 邓, Chao 超 Liu 刘","doi":"10.3847/1538-4365/ace77a","DOIUrl":"https://doi.org/10.3847/1538-4365/ace77a","url":null,"abstract":"Abstract White dwarfs represent the ultimate stage of evolution for over 97% of stars and play a crucial role in studies of the Milky Way’s structure and evolution. Recent years have witnessed significant progress in using deep-learning methods for identifying unique objects in large-scale data. In this paper, we present a model based on transfer learning for identifying white dwarfs. We constructed a data set using the spectra released by LAMOST DR9 and trained a convolutional neural network model. The model was then further trained using a transfer-learning approach for a binary classification model. Our final model is comprised of a seven-class classification model and a binary classification model. The testing set yielded an accuracy rate of 96.08%. Our proposed model successfully identifies 4314 of the 4479 white dwarfs published in previous papers. We applied this model to filter the 1,121,128 spectral data from the LAMOST DR9 V1 catalog. Subsequently, we obtained 6317 white dwarf candidates, of which 5014 were cross-validated and found to be known white dwarfs. We finally identified 489 new white dwarfs out of the remaining 1303 candidates, containing 377 DAs, 1 DB, 4 DZs, 1 magnetic WD, 101 DA+M binaries, and 1 DB+M binary. Our study also compared transfer-learning methods with non-transfer-learning methods, and the results show that transfer learning provides faster training speed and a higher accuracy rate. We provide the trained model and a corresponding usage program for subsequent studies.","PeriodicalId":8588,"journal":{"name":"Astrophysical Journal Supplement Series","volume":"131 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135249433","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Critically Evaluated Atomic Data for the Au iv Spectrum","authors":"Aashna Zainab, K. Haris, Sébastien Gamrath, Pascal Quinet, A. Tauheed","doi":"10.3847/1538-4365/acd117","DOIUrl":"https://doi.org/10.3847/1538-4365/acd117","url":null,"abstract":"Abstract A spectral investigation of triply ionized gold (Au iv ) has been carried out in the wavelength region of 500–2106 Å. The gold spectra were photographed at the National Institute of Standards and Technology, USA, on a 10.7 m normal incidence vacuum spectrograph (NIVS) using a sliding spark source as well as on a 3 m NIVS at the Antigonish laboratory in Canada with a triggered spark source. Our analysis is theoretically supported by the pseudorelativistic Hartree–Fock (HFR) formalism with a superposition of configuration interactions implemented in Cowan's suite of codes. Radiative transition parameters are also calculated using the HFR+CPOL (core polarization effects) model and the multiconfiguration Dirac–Hartree–Fock approach, and their comparisons are used to evaluate the transition rate data. All the previously reported levels of the 5 d 8 , 5 d 7 6 s , and 5 d 7 6 p configurations are confirmed, except one, and three are newly established. The missing 1 S 0 level of 5 d 8 is now established at 55,277.8 cm −1 . A total of 981 observed lines (E1 type), classified to 1031 transitions, including 133 newly identified, enabled us to optimize 139 energy levels. Several astrophysically important transitions, forbidden (M1- and E2-type) lines of 5 d 8 and 5 d 7 6 s , are provided with their Ritz wavelengths and radiative parameters. A critically evaluated set of energy levels, observed and Ritz wavelengths along with their uncertainties, transition rates, and uniformly scaled intensities of Au iv lines have been presented. Also, large-scale atomic data to compute the opacity of Au iv in the kilonova ejecta have been supplemented in this work.","PeriodicalId":8588,"journal":{"name":"Astrophysical Journal Supplement Series","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135364261","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evaluation of plasma vitamin E and development of proteinuria in hypertensive patients.","authors":"Panpan He, Huan Li, Yuanyuan Zhang, Yun Song, Chengzhang Liu, Lishun Liu, Binyan Wang, Huiyuan Guo, Xiaobin Wang, Yong Huo, Hao Zhang, Xiping Xu, Jing Nie, Xianhui Qin","doi":"10.2478/jtim-2023-0004","DOIUrl":"10.2478/jtim-2023-0004","url":null,"abstract":"<p><strong>Background: </strong>The prospective relationship between plasma vitamin E levels and proteinuria remains uncertain. We aimed to evaluate the association between baseline plasma vitamin E levels and the development of proteinuria and examine any possible effect modifiers in patients with hypertension.</p><p><strong>Methods: </strong>This was a post hoc analysis of the renal sub-study of the China Stroke Primary Prevention Trial (CSPPT). In total, 780 participants with vitamin E measurements and without proteinuria at baseline were included in the current study. The study outcome was the development of proteinuria, defined as a urine dipstick reading of a trace or ≥ 1+ at the exit visit.</p><p><strong>Results: </strong>During a median follow-up duration of 4.4 years, the development of proteinuria occurred in 93 (11.9%) participants. Overall, there was an inverse relationship between plasma vitamin E and the development of proteinuria (per standard deviation [SD] increment; odds ratio [OR]: 0.73, 95% confidence interval [CI]: 0.55-0.96). Consistently, when plasma vitamin E was assessed as quartiles, lower risk of proteinuria development was found in participants in quartiles 2-4 (≥ 7.3 μg/mL; OR: 0.57, 95% CI: 0.34-0.96) compared to those in quartile 1. None of the variables, including sex, age, and body mass index, significantly modified the association between vitamin E and proteinuria development.</p><p><strong>Conclusion: </strong>There was a significant inverse association between plasma vitamin E levels and the development of proteinuria in patients with hypertension. The results were consistent among participants with different baseline characteristics.</p>","PeriodicalId":8588,"journal":{"name":"Astrophysical Journal Supplement Series","volume":"77 1","pages":"78-85"},"PeriodicalIF":4.9,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10956724/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82659614","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Erratum: \"Inference of the Local Interstellar Spectra of Cosmic-Ray Nuclei <i>Z</i> ⩽ 28 with the GALPROP-HELMOD Framework\" (2020, ApJS, 250, 27).","authors":"M J Boschini,&nbsp;S Della Torre,&nbsp;M Gervasi,&nbsp;D Grandi,&nbsp;G Jóhannesson,&nbsp;G La Vacca,&nbsp;N Masi,&nbsp;I V Moskalenko,&nbsp;S Pensotti,&nbsp;T A Porter,&nbsp;L Quadrani,&nbsp;P G Rancoita,&nbsp;D Rozza,&nbsp;M Tacconi","doi":"10.3847/1538-4365/ac2518","DOIUrl":"https://doi.org/10.3847/1538-4365/ac2518","url":null,"abstract":"<p><p>[This corrects the article PMC8549769.].</p>","PeriodicalId":8588,"journal":{"name":"Astrophysical Journal Supplement Series","volume":"256 2","pages":""},"PeriodicalIF":8.7,"publicationDate":"2021-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8588013/pdf/nihms-1750425.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"39875773","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"SiO, ²⁹SiO, and ³⁰SiO emission from 67 oxygen-rich stars. A survey of 61 maser lines from 7 to 1 mm.","authors":"J R Rizzo, J Cernicharo, C Garoía-Miró","doi":"10.3847/1538-4365/abe469","DOIUrl":"10.3847/1538-4365/abe469","url":null,"abstract":"<p><p>Circumstellar environments of oxygen-rich stars are among the strongest SiO maser emitters. Physical processes such as collisions, infrared pumping and overlaps favors the inversion of level population and produce maser emission at different vibrational states. Despite numerous observational and theoretical efforts, we still do not have an unified picture including all the physical processes involved in the SiO maser emission. The aim of this work is to provide homogeneous data in a large sample of oxygen-rich stars. We present a survey of 67 oxygen-rich stars from 7 to 1 mm, in their rotational transitions from <i>J</i> = 1 → 0 to <i>J</i> = 5 → 4, for vibrational numbers <i>v</i> from 0 to 6 in the three main SiO isotopologues. We have used one of the 34 m NASA antennas at Robledo and the IRAM 30 m radio telescope. The first tentative detection of a <i>v</i> = 6 line is reported, as well as the detection of new maser lines. The highest vibrational levels seem confined to small volumes, presumably close to the stars. The <i>J</i> = 1 → 0, <i>v</i> = 2 line flux is greater than the corresponding <i>v</i> = 1 in almost half of the sample, which may confirm a predicted dependence on the pulsation cycle. This database is potentially useful in models which should consider most of the physical agents, time dependency, and mass-loss rates. As by-product, we report detections of 27 thermal rotational lines from other molecules, including isotopologues of SiS, H₂S, SO, SO₂, and NaCl.</p>","PeriodicalId":8588,"journal":{"name":"Astrophysical Journal Supplement Series","volume":"253 2","pages":""},"PeriodicalIF":8.7,"publicationDate":"2021-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7610587/pdf/EMS120887.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"25601444","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Inference of the Local Interstellar Spectra of Cosmic-Ray Nuclei <i>Z</i> ⩽ 28 with the GalProp-HelMod Framework.","authors":"M J Boschini,&nbsp;S Della Torre,&nbsp;M Gervasi,&nbsp;D Grandi,&nbsp;G Jóhannesson,&nbsp;G La Vacca,&nbsp;N Masi,&nbsp;I V Moskalenko,&nbsp;S Pensotti,&nbsp;T A Porter,&nbsp;L Quadrani,&nbsp;P G Rancoita,&nbsp;D Rozza,&nbsp;M Tacconi","doi":"10.3847/1538-4365/aba901","DOIUrl":"10.3847/1538-4365/aba901","url":null,"abstract":"<p><p>Composition and spectra of Galactic cosmic rays (CRs) are vital for studies of high-energy processes in a variety of environments and on different scales, for interpretation of <i>γ</i>-ray and microwave observations, for disentangling possible signatures of new phenomena, and for understanding of our local Galactic neighborhood. Since its launch, AMS-02 has delivered outstanding-quality measurements of the spectra of <math><mover><mi>p</mi> <mo>¯</mo></mover> </math> , <i>e</i> ^±, and nuclei: ₁H-₈O, ₁₀Ne, ₁₂Mg, ₁₄Si. These measurements resulted in a number of breakthroughs; however, spectra of heavier nuclei and especially low-abundance nuclei are not expected until later in the mission. Meanwhile, a comparison of published AMS-02 results with earlier data from HEAO-3-C2 indicates that HEAO-3-C2 data may be affected by undocumented systematic errors. Utilizing such data to compensate for the lack of AMS-02 measurements could result in significant errors. In this paper we show that <i>a fraction</i> of HEAO-3-C2 data <i>match</i> available AMS-02 measurements quite well and can be used together with Voyager 1 and ACE-CRIS data to make <i>predictions</i> for the local interstellar spectra (LIS) of nuclei that are not yet released by AMS-02. We are also updating our already-published LIS to provide a complete set from ₁H-₂₈Ni in the energy range from 1 MeV nucleon^-1 to ~100-500 TeV nucleon^-1, thus covering 8-9 orders of magnitude in energy. Our calculations employ the GalProp-HelMod framework, which has proved to be a reliable tool in deriving the LIS of CR <math><mover><mi>p</mi> <mo>¯</mo></mover> </math> , <i>e</i> ^-, and nuclei ₁H-₈O.</p>","PeriodicalId":8588,"journal":{"name":"Astrophysical Journal Supplement Series","volume":"250 2","pages":""},"PeriodicalIF":8.7,"publicationDate":"2020-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8549769/pdf/nihms-1742133.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"39824435","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Line Lists for the State of CS","authors":"Shilin Hou, Zhengxing Wei","doi":"10.3847/1538-4365/ab61ef","DOIUrl":"https://doi.org/10.3847/1538-4365/ab61ef","url":null,"abstract":"Rotation-vibrational line lists for eight isotopologues of carbon monosulphide (CS; 12C32S, 12C33S, 12C34S, 12C36S,13C32S, 13C33S,13C34S, and 13C36S) in their ground electronic state (X1Σ+) are calculated. An empirical potential function with the corrections of Born–Oppenheimer breakdown effects, which are determined by a direct potential fitting approach using over 4300 observed transition frequencies of 12C32S, 12C33S, 12C34S, and 13C32S, is used in line list calculations. The reproduced transition frequencies are within the observation uncertainties for the isotopologues with experimental data. The dipole moment functions are calculated using an ab initio method at a multireference configuration interaction method/cc-pv5z level with a large active space of electronic configuration. The dipole moment at equilibrium nuclear separation is almost identical to the experimental result. The calculated intensities agree excellently with the laboratory observations at 2573 K. The corresponding Einstein A coefficients and oscillator strengths are predicted. Partition functions for temperatures up to 7500 K have been calculated. The line lists can be used for spectroscopic measurements of CS in astronomical environments of various temperatures.","PeriodicalId":8588,"journal":{"name":"Astrophysical Journal Supplement Series","volume":"246 1","pages":""},"PeriodicalIF":8.7,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3847/1538-4365/ab61ef","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70000854","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Project profile: a multicenter study on breast cancer in young women in Latin America (PRECAMA study).","authors":"Isabelle Romieu, Carine Biessy, Gabriela Torres-Mejía, Angélica Ángeles-Llerenas, Gloria Inés Sánchez, Mauricio Borrero, Carlos Andrés Ossa, Carolina Porras, Ana Cecilia Rodríguez, Rebecca Ocampo, María Luisa Garmendia, Eva Bustamante, Magali Olivier, Peggy Porter, Sabina Rinaldi","doi":"10.21149/10466","DOIUrl":"10.21149/10466","url":null,"abstract":"<p><strong>Objective: </strong>To describe the rationale and the methodology of a multicenter project to study the etiology of breast cancer in young Latin American women.</p><p><strong>Materials and methods: </strong>The International Agency for Research on Cancer has established an international collaborative population-based case-control study in four countries in Latin America: Chile, Colombia, Costa Rica, and Mexico (the PRECAMA study). Standardized methodologies were developed to collect information on reproductive variables, lifestyle, anthropometry, diet, clinical and pathological data, and biological specimens. The study will be extended to other countries in the region.</p><p><strong>Conclusions: </strong>PRECAMA is unique in its multidisciplinary approach that combines genetics, genomics, and metabolomics with lifestyle factors. Then data generated through this project will be instrumental to identify major risk factors for molecular subtypes of breast cancer in young women, which will be important for pre- vention and targeted screening programs in Latin America.</p>","PeriodicalId":8588,"journal":{"name":"Astrophysical Journal Supplement Series","volume":"58 1","pages":"601-608"},"PeriodicalIF":2.3,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82627094","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}