A5039249550- Astrophysics and Star Formation Studies
- Stellar, planetary, and galactic studies
- Molecular Spectroscopy and Structure
- Astronomy and Astrophysical Research
- Galaxies: Formation, Evolution, Phenomena
- Astro and Planetary Science
- Astronomical Observations and Instrumentation
- Atmospheric Ozone and Climate
- Gamma-ray bursts and supernovae
- Astrophysics and Cosmic Phenomena
- Advanced Combustion Engine Technologies
- Advanced Chemical Physics Studies
- Astrophysical Phenomena and Observations
- Radio Astronomy Observations and Technology
- Calibration and Measurement Techniques
- Solar and Space Plasma Dynamics
- Ionosphere and magnetosphere dynamics
- Spacecraft and Cryogenic Technologies
- Spectroscopy and Laser Applications
- Scientific Research and Discoveries
- Cosmology and Gravitation Theories
- Geophysics and Gravity Measurements
- Advanced Thermodynamic Systems and Engines
- Space Exploration and Technology
- Elasticity and Material Modeling
Max Planck Institute for Radio Astronomy
2015-2025
University of Chinese Academy of Sciences
2012-2024
Purple Mountain Observatory
2012-2024
Chinese Academy of Sciences
2012-2024
National Astronomical Observatories
2022-2024
Anhui University of Science and Technology
2024
Arcetri Astrophysical Observatory
2022
National University of Singapore
2016
UC Irvine Health
2012
Iowa State University
2010
The Milky Way Imaging Scroll Painting (MWISP) project is an unbiased Galactic plane CO survey for mapping regions of l=-10deg to +250deg and |b|<5.2deg with the 13.7 m telescope Purple Mountain Observatory. legacy aims observe 12CO, 13CO, C18O (J=1-0) lines simultaneously full sampling using nine-beam Superconducting SpectroScopic Array Receiver (SSAR) system instantaneous bandwidth 1 GHz. In this paper, completed 250 deg^2 data from l=+25.8deg +49.7deg are presented a grid spacing 30"...
Context. Isotope abundance ratios provide a powerful tool for tracing stellar nucleosynthesis, evaluating the composition of ejecta, and constraining chemical evolution Milky Way. Aims. We aim to measure 12 C/ 13 C, 32 S/ 34 S, 33 36 S isotope across Methods. With IRAM 30 meter telescope, we performed observations J = 2−1 transitions CS, C as well 3−2 CS toward large sample 110 high-mass star-forming regions. Results. measured with rare isotopologs thus avoiding significant saturation...
Surveys of the Milky Way at various wavelengths have changed our view star formation in Galaxy considerably recent years. In this paper we give an overview GLOSTAR survey, a new survey covering large parts (145 square degrees) northern Galactic plane using Karl G. Jansky Very Large Array (JVLA) frequency range 4-8 GHz and Effelsberg 100-m telescope. This provides for first time radio all angular scales down to 1.5 arcsecond, similar complementary near-IR mid-IR galactic surveys. We outline...
Hub-filament systems are suggested to be the birth cradles of high-mass stars and clusters. We apply FILFINDER algorithm integrated intensity maps 13CO (3-2) line identify filaments in G333 complex, extract velocity along filament skeleton from moment maps. Clear density fluctuations seen filaments, allowing us fit gradients around peaks. The fitted LAsMA data ALMA agree with each other over scales covered by observations ATOMS survey. Changes gradient scale indicate a ''funnel'' structure...
Studying accretion-driven episodic outbursts in YSOs is key to understanding the later stages of star and planet formation. FU Orionis-type objects form a YSO subclass, distinguished by rapid, multi-magnitude increases brightness at optical near-infrared wavelengths. These may significantly impact chemistry molecular composition around eruptive stars. However, no comprehensive millimeter-wavelength line survey exists for more evolved (Class II) sources, unlike coverage. We conducted first...
II ) sources, in contrast to wide-band coverages at optical and near-infrared wavelengths We carried out the first dedicated millimeter line survey toward low-mass young eruptive star classical FUor V1057 Cyg, which has highest observed peak accretion rate among FUors. This source is known have a molecular outflow, it associated with dense material. makes good candidate for search species. performed spectral of Cyg IRAM 30 m telescope from ∼72 ∼263,GHz (with spatial resolution between...
Understanding the chemistry of molecular clouds is pivotal to elucidate star formation and galaxy evolution. As one important ions, HCNH^+ plays an role in this chemistry. Yet, its behavior significance under extreme conditions, such as central zones (CMZs) external galaxies, are still largely unexplored. We aim reveal physical chemical properties CMZ starburst NGC 253 with multiple transitions shed light on molecule's conditions a starburst. employed line data including results for four...
The Earth’s magnetosheath is a vital source region of soft X-ray emissions generated by the solar wind charge exchange (SWCX) mechanism in geospace. Soft imaging provides valuable insights into overall morphology magnetosheath. Nevertheless, dynamic variations images during extreme space weather have not been comprehensively studied. Using global magnetohydrodynamic code, we simulated temporal magnetosphere on 10-11 May 2024, most intense geomagnetic storm Solar Cycle 25. entire event are...
Strong laser emission from hydrogen cyanide (HCN) at 805 and 891 GHz has been discovered towards carbon-rich (C-rich) asymptotic giant branch (AGB) stars. Both lines belong to the Coriolis-coupled system between (1,1^ 1e,0) (0,4^0,0) vibrational states, which extensively studied in early molecular spectroscopy laboratory. However, other this with frequencies above ∼900 GHz, are challenging observe ground-based telescopes, have remained unexplored astronomical contexts. We aim (1) search for...
The Earth's magnetosheath is a vital source region of soft X-ray emissions generated by the solar wind charge exchange (SWCX) mechanism in geospace. Soft imaging provides valuable insights into overall morphology magnetosheath. Nevertheless, dynamic variations images during extreme space weather have not been comprehensively studied. Using global magnetohydrodynamic code, we simulated temporal magnetosphere on 10-11 May 2024, most intense geomagnetic storm Solar Cycle 25. entire event are...
We derive molecular-gas-phase $^{12}$C/$^{13}$C isotope ratios for the central few 100 pc of three nearby starburst galaxies NGC 253, 1068, and 4945 making use $\lambda$ $\sim$ 3 mm $^{12}$CN $^{13}$CN $N$ = 1--0 lines in ALMA Band 3. The isotopic derived from these range 30 to 67 with an average 41.6 $\pm$ 0.2 24 62 38.3 0.4 6 44 16.9 0.3 4945. highest are determined some outskirts nuclear regions galaxies. lowest associated northeastern southwestern molecular peaks edge mapped region very...
The GLOSTAR survey will study the star formation in Galactic plane between $-2^{\circ}< \textit{l}< 85^{\circ}$ and $|b| < 1^{\circ}$ with unprecedented sensitivity both, flux density ($\sim$ 40 $μJy$ beam$^{-1}$) range of angular scales 1."5 to largest radio structures Galaxy). In this paper we present first results obtained from a continuum map 16 square degree sized region centered on $\textit{l} = 32^{\circ}$ $b 0^{\circ}$ ($28^{\circ} \textit{l} 36^{\circ}$ 1^{\circ}$). This...
Context. The properties of the population Galactic supernova remnants (SNRs) are essential to our understanding dynamics interstellar medium (ISM) in Milky Way. However, completeness catalog SNRs is expected be only ~30%, with on order 700 yet detected. Deep interferometric radio continuum surveys plane help rectifying this apparent deficiency by identifying low surface brightness and compact that have not been detected previous surveys. routinely confused H II regions, which can similar...
Class II methanol (CH$_{3}$OH) masers are amongst the clearest signposts of recent high-mass star formation (HMSF). A complete catalogue outlines distribution in Galaxy, number young star-forming cores, and physical conditions their environment. The Global View on Star Formation (GLOSTAR) survey, which is a blind survey radio regime 4$-$8 GHz, maps Galactic mid-plane continuum, 6.7 GHz line, 4.8 formaldehyde several recombination lines. We present analysis observations CH$_{3}$OH maser...
Abstract A significant excess of the stellar mass density at high redshift has been discovered from early data release James Webb Space Telescope (JWST), and it may require a star formation efficiency. However, this will lead to large number ionizing photons in epoch reionization (EoR), so that history be changed, which can arise tension with current EoR observations. Warm dark matter (WDM), via free streaming effect, suppress small-scale structure as well low-mass galaxies. This provides an...
Orion KL has served as a benchmark for spectral line searches throughout the (sub)millimeter regime. The main goal is to systematically study characteristics of in 1.3 cm band. We carried out survey (17.9 GHz 26.2 GHz) with Effelsberg-100 m telescope towards KL. find 261 lines, yielding an average density about 32 features per above 3$\sigma$. identified lines include 164 radio recombination (RRLs) and 97 molecular lines. A total 23 transitions from species known exist are detected first...
Context. IRC +10216 is the prototypical carbon star exhibiting an extended molecular circumstellar envelope. Its spectral properties are therefore template for entire class of objects.
Abstract We present a new large-scale (2° × 2°) simultaneous 12 CO, 13 and C 18 O ( J = 1–0) mapping of L1188 with the Purple Mountain Observatory 13.7 m telescope. Our observations have revealed that consists two nearly orthogonal filamentary molecular clouds at clearly separated velocities. Toward intersection showing large velocity spreads, we find several bridging features connecting in velocity, an open arc structure exhibits high excitation temperatures, enhanced CO emission, broad...
Studies of Galactic H II regions are crucial importance for studying star formation and the evolution interstellar medium. Gaining an insight into their physical characteristics contributes to a more comprehensive understanding these phenomena. The GLOSTAR project aims provide GLObal view on STAR in Milky Way by performing unbiased sensitive survey. This is achieved using extremely wideband (4–8 GHz) C -band receiver Karl G. Jansky Very Large Array Effelsberg 100 m telescope. Using radio...
NGC 4945 is one of the nearest ( D ≈ 3.8 Mpc; 1″ 19 pc) starburst galaxies. To investigate structure, dynamics, and composition dense nuclear gas this galaxy, ALMA band 3 λ 3−4 mm) observations were carried out with ≈2″ resolution. Three HCN two HCO + isotopologues, CS, C H 2 , SiO, HCO, CH measured. Spectral line imaging demonstrates presence a rotating disk projected size 10″ × 2″ reaching to galactocentric radius r 100 pc position angle PA = 45° ± 2°, inclination i 75° 2° an unresolved...
As part of the GLOSTAR survey we have used VLA in its B-configuration to observe Galactic plane between longitudes 28d and 36d latitudes from -1d +1d at C-band (4--8 GHz). To reduce contamination extended sources that are not well recovered by our coverage (u, v)-plane discarded short baselines sensitive emission on angular scales $<4"$. The resulting radio continuum images an resolution 1.0", sensitivity $\sim60 \mu$Jy~beam$^{-1}$; making it most covering a large area with this resolution....
Context. Cygnus X is one of the closest and most active high-mass star-forming regions in our Galaxy, making it best laboratories for studying massive star formation. Aims. We aim to investigate properties molecular gas structures on different linear scales with 4.8 GHz formaldehyde (H 2 CO) absorption line X. Methods. As part GLOSTAR Galactic plane survey, we performed large-scale (7º×3º) simultaneous H CO (1 1,0 –1 1,1 ) spectral radio continuum imaging observations toward at λ ~6 cm Karl...