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Stellar X-ray Sources in the Rosette Nebula

Chinese Journal of Astronomy and Astrophysics 2004年第2期4卷 153-165页

作者： W.P.Chen P.S.Chiang J.Z.Li Institute of Astronomy National Central UniversityChung-Li 32054Taiwan National Astronomical Observatories Chinese Academy of SciencesBeijing 100012

We present optical photometric and spectroscopic studies of ROSAT X-ray stellar sources in the Rosette Nebula star-forming region. The brightest X-ray sources are either massive stars or active T Tauri stars associated with the open cluster NGC 2244, or are foreground stars. Some of the spectra of the young stars newly identified in the region are presented.

关键词： stars: early-type stars: pre-main sequence stars: formation hii regions

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A Survey and Statistics of Interstellar OH and H_2O Masers

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Chinese Journal of Astronomy and Astrophysics 2005年第2期5卷 175-183页

作者： Han-PingLiu J.R.Forster JinSun DepartmentofPhysics BeijingNormalUniversityBeijing100875 UniversityofCalifornia BerkeleyandHatCreekRadioObservatory42231BidwellRoadHatCreekCA96040 DepartmentofAstronomy BeijingNormalUniversityBeijing100875

We present a statistical analysis of a sky survey of interstellar H2O and OH masers. These masers can be classified into three categories: isolated H2O masers, isolated OH masers, and simple OH/H2O maser associations. The total number of sources in each category is of the same order of magnitude, and as an evolutionary phase they can maintain ~ 105 yr. An improved radiative pumping mechanism is proposed. This model avoids some of the deficiencies of previous radiative models, such as shortage of exciting photons. The statistical results obtained from the survey can be interpreted by the new mechanism together with the evolutionary model in which the gravitational force of the central stellar objects is responsible for the hii region.

关键词： surveys masers radiation mechanism: non-thermal hii regions

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Peering into the Milky Way by FAST:Ⅱ.Ionized gas in the inner Galactic disk revealed by the piggyback line observations of the FAST GPPS survey

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Science China(Physics,Mechanics & Astronomy) 2022年第12期65卷 18-38页

作者： LiGang Hou JinLin Han Tao Hong XuYang Gao Chen Wang National Astronomical Observatories Chinese Academy of SciencesBeijing 100101China School of Astronomy University of Chinese Academy of SciencesBeijing 100049China

As one of the major components of the interstellar medium,the ionized gas in our Milky Way,especially the low-density diffuse component,has not been extensively observed in the radio *** Galactic Plane Pulsar Snapshot(GPPS)survey covers the sky area within the Galactic latitude of±10°around the Galactic plane visible by the Five-hundred-meter Aperture Spherical radio Telescope(FAST),and the spectral line data are simultaneously recorded during the pulsar survey *** an integration time of 5 min for each beam,the GPPS survey project provides the most sensitive piggyback spectra for tens of radio recombination lines(RRLs)in the band of 1000-1500 MHz for Hnα,Henα,Cnα,as well as Hnβand Hnγ.We processed the spectral data of RRLs,and obtained a sensitive averaged HnαRRL map of a sky area of 88 square degrees in the inner Galaxy of 33°≤l≤55°and∣b∣≤2°*** final spectral data of the HnαRRLs have a spatial resolution of∼3′,a spectral resolution of 2.2 km s^(−1),and a typical spectral RMS noise of 0.25 mJy beam−1 or 6.3 mK in main-beam brightness *** FAST GPPS HnαRRL observations are sensitive down to an emission measure of about 200 cm^(−6) pc if a 3σdetection limit is *** new HnαRRL map shows complex structural features dominated by a number of hii regions and large extended diffuse ionized gas *** detect about 94%of the known hii regions and confirm 43 WISE hii regions in the observed sky *** large hii regions or star-forming complexes in the distant outer Galaxy are resolved in the map of Hnα*** RRL features of the diffuse ionized gas are *** addition,the GPPS piggyback spectral-line data also provide sensitive detection for other kinds of RRLs,such as the Henα,Cnα,Hnβ,and Hnγ*** RRL data products of the GPPS survey will be published and updated at http://***/MilkyWayFAST/.

关键词： surveys ISM hii regions radio lines

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