• J. Wang

      Articles written in Journal of Astrophysics and Astronomy

    • Multi-Wavelength Studies on H2O Maser Host Galaxies

      J. S. Zhang J. Wang

      More Details Abstract Fulltext PDF

      H2O maser emissions have been found in external galaxies for more than 30 years. Main sciences associated with extragalactic H2O masers can be summarized roughly into three parts: maser emission itself, AGN sciences and cosmology exploration. Our work in this field focusses on two projects: X-ray data analysis of individual maser source using X-ray penetrability to explore maser host obscured AGN; multi-wavelength statistical properties of the whole published H2O maser sample. Here their nuclear radio properties were investigated in detail, based on their 6-cm and 20-cm radio observation data. Comparing the radio properties between maser-detected sources and non-detected sources at similar distance scale, we find that: (1) maser host galaxies tend to have higher nuclear radio luminosity; (2) the spectral index of both samples is comparable (∼ 0.6), within the error ranges. In addition, for AGN-maser sources, the isotropic maser luminosity tends to increase with rising radio luminosity. Thus we propose the nuclear radio luminosity as one good indicator for searching AGN-masers in the future.

    • The Eddington Ratio of H2O Maser Host AGN

      Q. Guo J. S. Zhang J. Wang

      More Details Abstract Fulltext PDF

      The Eddington ratio 𝜆 was derived for the entire maser host AGN sample, based on the intrinsic X-ray luminosity, the X-ray bolometric correction 𝐶X and the mass of central black hole. Further the [O III] bolometric correction 𝐶[O III] was estimated for our sample. Possible relations were also investigated between the maser luminosity and the bolometric luminosity – the Eddington ratio.

    • Chandra and XMM–Newton Observations of H2O Maser Galaxy Mrk 266

      J. Wang J. S. Zhang J. H. Fan

      More Details Abstract Fulltext PDF

      For H2O megamaser galaxy Mrk 266, its Chandra and XMM–Newton data are analyzed here. It shows existence of two obscured nuclei (separation is ∼ 5''). Our preferred model, the high energy reflected model can fit the hard component of both nuclei spectra well.

    • Bolometric Luminosity Correction of H2O Maser AGNs

      Q. Guo J. S. Zhang J. Wang

      More Details Abstract Fulltext PDF

      For the H2O maser host AGN sample, we derived their bolometric luminosity corrections, based on their X-ray data and [O III] emission line luminosities. Our results for maser AGNs is comparable to that of non-maser AGNs.

    • Chandra and XMM–Newton Observations of H2O Maser Galaxy Mrk 348

      J. Wang J. S. Zhang Q. Guo

      More Details Abstract Fulltext PDF

      For H2O megamaser galaxy Mrk 348, Chandra and XMM–Newton data are analysed. The nuclear fitting results of XMM–Newton data suggest the possible existence of a heavily obscured AGN. But the nuclear spectrum extracted from Chandra cannot be well-fitted by the best fitting model for XMM–Newton. Further optimal fitting and discussions are needed.

    • Astronomy Education Project for Guangdong High Schools

      F. P. Pi K. Y. Guan J. Wang H. G. Wang Y. Liu J. H. Fan

      More Details Abstract Fulltext PDF

      Guangdong province is an active area in China for astronomy education and popularization. The current status and problems of astronomy education in high schools are reviewed. To tackle these problems, an astronomy education project for high school teachers and students was initiated by Guangzhou University in 2013. The purpose and key points of the projects are introduced in this paper.

  • Journal of Astrophysics and Astronomy | News

    • Continuous Article Publication

      Posted on January 27, 2016

      Since January 2016, the Journal of Astrophysics and Astronomy has moved to Continuous Article Publishing (CAP) mode. This means that each accepted article is being published immediately online with DOI and article citation ID with starting page number 1. Articles are also visible in Web of Science immediately. All these have helped shorten the publication time and have improved the visibility of the articles.

    • Editorial Note on Continuous Article Publication

      Posted on July 25, 2019

      Click here for Editorial Note on CAP Mode

© 2017-2019 Indian Academy of Sciences, Bengaluru.