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Observation of HⅠaround three Satellite Galaxies of M31 with FAST:AndromedaⅡ,NGC 205,and NGC 185
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作者 Ziming liu Jie Wang +6 位作者 Yingjie Jing Chen Xu Tiantian Liang Qingze Chen zerui liu Zhipeng Hou Yougang Wang 《Research in Astronomy and Astrophysics》 SCIE CAS CSCD 2024年第8期52-59,共8页
With the exceptional sensitivity of the Five-hundred-meter Aperture Spherical radio Telescope,we conducted observations of the neutral hydrogen(HⅠ)in the circumgalactic medium of Andromeda’s(M31)satellite galaxies,s... With the exceptional sensitivity of the Five-hundred-meter Aperture Spherical radio Telescope,we conducted observations of the neutral hydrogen(HⅠ)in the circumgalactic medium of Andromeda’s(M31)satellite galaxies,specifically AndromedaⅡ,NGC 205,and NGC 185.Initially,three drift scans were executed for these satellites,with a detection limit of 4×10^(18)cm^(-2)(approximately 1.88×10^(3)M_Θof HⅠmass),followed by a more in-depth scan of a specific region.We discovered a C-shaped HⅠarc structure sharing a position and line-of-sight velocity similar to a stellar ring structure around AndromedaⅡ,hinting at a potential connection with AndromedaⅡ.In the context of NGC 205,we identified two mass concentrations in the northeast direction,which could be indicative of tidal streams resulting from the interaction between this galaxy and M31.These new lumps discovered could be very helpful in solving the missing interstellar medium problem for NGC 205.Observations regarding NGC 185are consistent with previous studies,and we did not detect any additional HⅠmaterial around this galaxy.These observational results enhance our understanding of the evolution of these satellite galaxies and provide insight into their historical interactions with the galaxy M31. 展开更多
关键词 ISM structure-(Galaxy)local interstellar matter-galaxies interactions-galaxies ISM-(galaxies)Local Group-radio lines ISM-radio lines GALAXIES
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HiFAST:An HIdata calibration and imaging pipeline for FAST
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作者 Yingjie Jing Jie Wang +30 位作者 Chen Xu Ziming liu Qingze Chen Tiantian Liang Jinlong Xu Yixian Cao Jing Wang Huijie Hu Chuan-Peng Zhang Qi Guo Liang Gao Mei Ai Hengqian Gan Xuyang Gao Jinlin Han Ligang Hou Zhipeng Hou Peng Jiang Xu Kong Fujia Li zerui liu Li Shao Hengxing Pan Jun Pan Lei Qian Jinghai Sun Ningyu Tang Qingliang Yang Bo Zhang Zhiyu Zhang Ming Zhu 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS CSCD 2024年第5期182-199,共18页
The Five-hundred-meter Aperture Spherical radio Telescope(FAST)has the largest aperture and a 19-beam L-band receiver,making it powerful for investigating the neutral hydrogen atomic gas(HI)in the universe.We present ... The Five-hundred-meter Aperture Spherical radio Telescope(FAST)has the largest aperture and a 19-beam L-band receiver,making it powerful for investigating the neutral hydrogen atomic gas(HI)in the universe.We present HiFAST(https://hifast.readthedocs.io),a dedicated,modular,and self-contained calibration and imaging pipeline for processing the H?data of FAST.The pipeline consists of frequency-dependent noise diode calibration,baseline fitting,standing wave removal using an FFT-based method,flux density calibration,stray radiation correction,and gridding to produce data cubes.These modules can be combined as needed to process the data from most FAST observation modes:tracking,drift scanning,On-The-Fly mapping,and most of their variants.With HiFAST,the root-mean-square(RMS)noises of the calibrated spectra from all 19 beams were only slightly(~5%)higher than the theoretical expectation.The results for the extended source M33 and the point sources are consistent with the results from Arecibo.The moment maps(0,1 and 2)of M33 agree well with the results from the Arecibo Galaxy Environment Survey(AGES)with a fractional difference of less than 10%.For a common sample of 221 sources with signal-to-noise ratio S/N>10 from the Arecibo Legacy Fast ALFA(ALFALFA)survey,the mean value of fractional difference in the integrated flux density,Sint,between the two datasets is approximately 0.005%,with a dispersion of 15.4%.Further checks on the integrated flux density of 23 sources with seven observations indicate that the variance in the flux density of the source with luminous objects(Sint>2.5 Jy km s-1)is less than 5%.Our tests suggest that the FAST telescope,with the efficient,precise,and user-friendly pipeline HiFAST,will yield numerous significant scientific findings in the investigation of the H?in the universe. 展开更多
关键词 FRACTIONAL LUMINOUS CORRECTION
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具有超高灵敏度、宽工作范围、低检测限的3D气凝胶可穿戴压力传感器用于语音识别和生理信号监测 被引量:1
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作者 尚成硕 何翔天 +9 位作者 李晓迪 刘泽瑞 宋玉祥 张玉林 李旭 鲁勇 丁小康 刘婷 张纪才 徐福建 《Science China Materials》 SCIE EI CAS CSCD 2023年第5期1911-1922,共12页
随着智能电子设备的快速发展,对同时具有超高灵敏度、宽工作范围、低检测限的可穿戴压力传感器的需求越来越大.本文开发了一种基于超轻(29.5 mg cm^(-3))和弹性的3D壳聚糖/MXene(CS/MXene)复合气凝胶的压阻式压力传感器.由于CS和MXene... 随着智能电子设备的快速发展,对同时具有超高灵敏度、宽工作范围、低检测限的可穿戴压力传感器的需求越来越大.本文开发了一种基于超轻(29.5 mg cm^(-3))和弹性的3D壳聚糖/MXene(CS/MXene)复合气凝胶的压阻式压力传感器.由于CS和MXene之间的强静电吸引力,具有良好机械性能的CS/MXene气凝胶只需一步冷冻干燥即可获得,无需额外的化学处理.CS/MXene复合气凝胶压力传感器在小压力区(<1 kPa)和大压力区(1-20 kPa)的灵敏度分别为709.38和252.37 kPa^(-1).在此压力范围下,其灵敏度是目前报道的同类型气凝胶压力传感器的最高值.此外,该传感器具有快速的响应时间(<120 ms)、1.4 Pa的超低检测限以及10,000次循环后几乎无衰减的良好稳定性.以上出色的性能不仅使得该传感器可用于检测肢体活动和空间压力分布等较大幅度的压力信号,而且还能准确检测脉搏、语音等微小压力信号.这种多功能的柔性压力传感器极大地拓宽了可穿戴电子器件在语音识别、健康监测和人机交互等诸多领域的应用范围. 展开更多
关键词 wearable electronics CS/MXene aerogel piezoresistive pressure sensor voice recognition health monitoring
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