A5036645065- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Radio Astronomy Observations and Technology
- Gamma-ray bursts and supernovae
- Stellar, planetary, and galactic studies
- Astrophysics and Cosmic Phenomena
- Astrophysics and Star Formation Studies
- Astrophysical Phenomena and Observations
- Astronomical Observations and Instrumentation
- Geophysics and Gravity Measurements
- Geological and Geophysical Studies
- Neurogenesis and neuroplasticity mechanisms
- Advanced Decision-Making Techniques
- Advanced Algorithms and Applications
- Neonatal Respiratory Health Research
- Neuroinflammation and Neurodegeneration Mechanisms
- interferon and immune responses
- Respiratory viral infections research
- Advanced Computational Techniques and Applications
- Ideological and Political Education
- Educational Reforms and Innovations
- Congenital Diaphragmatic Hernia Studies
- Education and Critical Thinking Development
- Pulsars and Gravitational Waves Research
National Astronomical Observatories
2013-2025
Chinese Academy of Sciences
2013-2025
Guizhou University
2023-2024
University of Chinese Academy of Sciences
2017-2024
Wuhan University
2011
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 neutral hydrogen atomic gas (HI) in universe. We present HiFAST (https://hifast.readthedocs.io), dedicated, modular, self-contained calibration imaging pipeline processing HI data of FAST. consists frequency-dependent noise diode calibration, baseline fitting, standing wave removal using an FFT-based method, flux density stray radiation...
<title>Abstract</title> Galaxy filaments, as quasi-linear and extensive features of galaxy distributions, are a crucial component the cosmic web. Cosmological simulations have predicted hierarchical nature to filaments. However, direct view small-scale filaments has been lacking validate this prediction. Here we report detection sub-galaxy-filament in Ursa Major cluster using atomic-hydrogen observations. This filament consists cold gas clumps various types galaxies, spanning length...
Abstract Based on a high-sensitivity H i survey using the Five-hundred-meter Aperture Spherical radio Telescope, we identified an isolated cloud with system velocity of ∼127.0 km s −1 , which is associated optical galaxy KK153 in space. The gas shows typical disk-galaxy structure. Using baryonic Tully–Fisher relation, obtained that distance to 2.0 <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:msubsup> <mml:mrow/> <mml:mrow> <mml:mo>−</mml:mo>...
Abstract We present high-sensitivity and large-scale atomic hydrogen (H i ) observations toward lenticular (S0) galaxy NGC 4111 using the Five-hundred-meter Aperture Spherical Radio Telescope. The column-density map shows that seven other different types of galaxies share a huge H gas complex. data also suggest is interacting with galaxies. Moreover, we identified rotating disk associated from Still, rotation direction has deviated its stellar by about 34 <mml:math...
Abstract We report the discovery of a possible accretion stream toward Milky Way–type galaxy M106 based on very deep H i imaging data with Five-hundred-meter Aperture Spherical radio Telescope (FAST). The extends for about 130 kpc in projection length and it is similar to Magellanic many respects. provide unambiguous evidence morphology, kinematics local star formation activity show that gas being accreted onto disk M106. Such long continuous flow provides unique opportunity probe...
We observed the classical interacting galaxy M51 with FAST and obtain high sensitivity HI image column density down to 3.8 $\times$ 10$^{18}$ cm$^{-2}$. In we can see a diffuse extended envelope around system several new tidal features. also get deeper look at M51b's probable gas, which has an approximated velocity range of 560 740 km s$^{-1}$ flux 7.5 Jy s$^{-1}$. Compared VLA image, observe more complete structures Southeast Tail, Northeast Cloud Northwest Plume, as well features Southwest...
ABSTRACT We report the discovery of a 100 kpc H i tail in merging galaxy pair NGC 4490/85 detected by Five-Hundred-meter Aperture Spherical radio Telescope (FAST). The tidal tails extended both south and north directions, they are much longer than that reported previously based on VLA interferometric maps. is surrounded large gas envelope, starburst low-metallicity dwarf MAPS 1231+42 found to be connected with indicating interaction trigged intense star formation it. Based fact metallicity...
Abstract Based on a new H i survey using the Five-hundred-meter Aperture Spherical radio Telescope (FAST), combined with Pan-STARRS1 images, we identified an isolated cloud without any optical counterpart, named FAST J0139+4328. The newly discovered appears to be typical disk galaxy since it has double-peak shape in global profile and S-like rotation structure velocity-position diagram. Moreover, this extremely low absolute magnitude ( M B > −10.0 mag) stellar mass (<6.9 ×10 5 ⊙ )....
As first data release of a pilot extragalactic HI survey with Five-hundred-meter Aperture Spherical radio Telescope (FAST),we extracted 544 extragalaxies from three-dimensional(3D) spectral to perform interactive searching and computing, yielding global parameters for these detections, extending redshift ranges 21cm line up z = 0.04 ,which covers part the sky region in right ascension(R.A. or $\alpha$) declination(Dec $\delta$) range $00^{\rm h} 47^{\rm m}< \rm R.A.(J2000)<23^{\rm h}22^{\rm...
Abstract Using the group crossing time t c as an age indicator for galaxy groups, we have investigated correlation between and spiral fraction, well neutral hydrogen gas fraction of groups. Our sample is selected from SDSS DR7 catalog, derived Galaxy Zoo morphological data set. We found that correlated with time. further cross-matched latest released ALFALFA 70% H i source catalog identified 172 groups survey whose total mass can be by summing up all sources within radius. For galaxies not...
UCHII G25.4NW is a bright IR source in the inner Galaxy region. New HI images from VLA Galactic Plane Survey (VGPS) show clear absorption features associated with region up to 95 km s$^{-1}$, and there not any other absorptions tangential velocity. It reveals that at near-side distance of 5.7 kpc, it located molecular ring Using new distance, bolometric luminosity estimated as $10^{5.6} L_{\odot}$, which corresponds an O6 star. contains 460 $M_{\odot}$ ionized gas. High-resolution $^{13}$CO...
Based on a new HI survey using the Five-hundred-meter Aperture Spherical radio Telescope (FAST), combined with Pan-STARRS1 images, we identified an isolated cloud without any optical counterpart, named FAST J0139+4328. The newly discovered appears to be typical disk galaxy since it has double-peak shape in global profile and S-like rotation structure velocity-position diagram. Moreover, this extremely low absolute magnitude (M_B>-10.0 mag) stellar mass (<6.9*10^5 Msun). Furthermore,...
The integrated HI emission from hierarchical structures such as groups and clusters of galaxies can be detected by FAST at intermediate redshifts. Here we propose to use study the evolution global content over cosmic time measuring their emissions. We Virgo Cluster an example estimate detection limit FAST, have estimated integration detect a type cluster different redshifts (from z = 0.1 1.5).We also employed semi-analytic model (SAM) simulate contents in galaxy clusters. Our simulations...
ABSTRACT We report on high-sensitivity neutral hydrogen observations toward the gas-rich interacting galaxies NGC 3395/3396 with Five-hundred-meter Aperture Spherical radio Telescope (FAST). Compared to previous carried out by Very Large Array (VLA) and Westerbork Synthesis Radio (WSRT), a more extended H i envelope around this system has been detected. The total gas mass of is estimated be 7.8 × 109 M$_\odot$. This value 2.7 times than that reported based VLA interferometric maps. Previous...
We report on high-sensitivity neutral hydrogen observations toward the gas-rich interacting galaxies NGC 3395/3396 with Five-hundred-meter Aperture Spherical radio Telescope (FAST). Compared to previous carried out by Very Large Array (VLA) and Westerbork Synthesis Radio (WSRT), a more extended HI envelope around this system has been detected. The total gas mass of is estimated be 7.8 x 109 M. This value 2.7 times than that reported based VLA interferometric maps. Previous found large tail...
ABSTRACT We used Five-hundred-meter Aperture Spherical radio Telescope (FAST) to conduct deep H i imaging of the entire M 106 group region, and have discovered a few new filaments clouds. Three clouds/filaments are found in region connecting DDO 120 NGC 4288, indicating an interaction between these two galaxies. The features this suggest that is probably origin stream extending from northern end 4288 106. This structure similar Small–Large Magellanic Cloud stream, but much longer, about 190...
We used FAST to conduct deep HI imaging of the entire M 106 group region, and have discovered a few new filaments clouds. Three clouds/filaments are found in region connecting DDO 120 NGC 4288, indicating an interaction between these two galaxies. The features this suggest that is probably origin stream extending from northern end 4288 106. This structure similar SMC-LMC stream, but much longer, about 190 kpc. Furthermore, based on distance measurements, we determined satellite galaxy...
In view of the uncertain relationship between faults and symptoms in water-steam system power plant, this paper proposed a fault diagnosis method based on credibility theory. A fuzzy model which is practical effective was constructed by describing issues knowledge representation, choice control mechanism construction algorithm. Simultaneously, order to diminish errors, new setting rule confidence for made closer experts' thinking.
We observed the classical interacting galaxy M51 with FAST and obtain high sensitivity HI image column density down to 3.8 $\times$ 10$^{18}$ cm$^{-2}$. In we can see a diffuse extended envelope around system several new tidal features. also get deeper look at M51b's probable gas, which has an approximated velocity range of 560 740 km s$^{-1}$ flux 7.5 Jy s$^{-1}$. Compared VLA image, observe more complete structures Southeast Tail, Northeast Cloud Northwest Plume, as well features Southwest...
We report the discovery of a 100 kpc HI tail in merging galaxy pair NGC 4490/85 detected by Five-Hundred-meter Aperture Spherical radio Telescope (FAST). The tidal tails extended both south and north directions, they are much longer than that reported previously based on VLA interferometric maps. is surrounded large gas envelope, starburst low metallicity dwarf MAPS 1231+42 found to be connected with indicating interaction trigged intense star formation it. Based fact one order magnitude...
ABSTRACT We present the results of our new H i observations for nearby galaxy NGC 4449 using Five-hundred-meter Aperture Spherical radio Telescope (FAST). More diffuse gas was detected by FAST compared with previous studies. The measured extent is more than ∼19 arcmin (20 kpc) larger that in Very Large Array map, and disc ∼22 times optical diameter 4449. total mass 3.07 $\times 10^9\, \rm M_{\odot }$, which agreement Effelsberg telescope. found one cloud from channel map superposition dwarf...
Based on the atomic-hydrogen (HI) observations using Five-hundred-meter Aperture Spherical radio Telescope (FAST), we present a detailed study of gas-rich massive S0 galaxy NGC 1023 in nearby group. The presence an HI extended warped disk indicates that this originated from spiral galaxy. data also suggest is interacting with four dwarf galaxies. In particular, one largest galaxies has fallen into gas 1023, forming rare bright-dark pair large clump. This clump shows signature but no optical...
Abstract Based on the atomic-hydrogen (H i ) observations using Five-hundred-meter Aperture Spherical radio Telescope, we present a detailed study of gas-rich massive S0 galaxy NGC 1023 in nearby group. The presence H extended warped disk indicates that this originated from spiral galaxy. data also suggest is interacting with four dwarf galaxies. In particular, one largest galaxies has fallen into gas 1023, forming rare bright–dark pair large clump. This clump shows signature but no optical...