A5100345217- Galaxies: Formation, Evolution, Phenomena
- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Conducting polymers and applications
- Perovskite Materials and Applications
- Organic Electronics and Photovoltaics
- Gamma-ray bursts and supernovae
- Astrophysics and Star Formation Studies
- Astronomical Observations and Instrumentation
- Infrared Target Detection Methodologies
- Adaptive optics and wavefront sensing
- Remote Sensing and LiDAR Applications
- Advanced Image Processing Techniques
- Organic Light-Emitting Diodes Research
- Calibration and Measurement Techniques
- Quantum Dots Synthesis And Properties
- Advanced Vision and Imaging
- Molecular Junctions and Nanostructures
- Mycobacterium research and diagnosis
- Protein Structure and Dynamics
- Quantum optics and atomic interactions
- Cold Atom Physics and Bose-Einstein Condensates
- Advanced Frequency and Time Standards
- Electron Spin Resonance Studies
- Bacterial Genetics and Biotechnology
University of Toronto
2020-2024
Canadian Institute for Theoretical Astrophysics
2021-2023
University of Science and Technology of China
2013-2020
CAS Key Laboratory of Urban Pollutant Conversion
2015-2019
Quantum (Australia)
2016-2018
Chinese Academy of Sciences
2016
Hefei National Center for Physical Sciences at Nanoscale
2015
An amphiphilic surfactant, oleamide, was applied to dope the PCBM electron transport layer (ETL) of inverted structure perovskite solar cells (ISPSCs), resulting in a dramatic efficiency enhancement. Under optimized oleamide doping ratio 5.0 wt %, power conversion CH3NH3PbIxCl3-x perovskite-based ISPSC device is enhanced from 10.05% 12.69%, and this primarily due increases both fill factor short-circuit current. According surface morphology study perovskite/PCBM bilayer film, improves...
Inorganic metal oxide, especially TiO2, has been commonly used as an electron transport layer (ETL) in regular-structure (n-i-p) planar heterojunction perovskite solar cells (PHJ-PSCs) but generally suffers from high recombination rate and incompatibility with low-temperature solution processability. Herein, by applying ionic liquid (IL, 1-ethyl-3-methylimidazolium hexafluorophosphate ([EMIM]PF6)) either a TiO2-modifying interlayer or independent ETL, we investigated systematically IL...
Abstract Diffuse Galactic cirrus, or diffuse light (DGL), can be a prominent component in the background of deep wide-field imaging surveys. The DGL provides unique insights into physical and radiative properties dust grains our Milky Way, it also serves as contaminant on images, obscuring detection sources such low surface brightness galaxies. However, is challenging to disentangle from other components night sky. In this paper, we present technique for photometric characterization cirrus...
Abstract We report the discovery and multiwavelength follow-up of LEDA 1313424 (“Bullseye”), a collisional ring galaxy (CRG) with nine readily identified rings—the most so far reported for CRG. These data shed new light on rapid, multiring phase CRG evolution. Using Hubble Space Telescope (HST) imaging, we identify measure structures, several which are “piled up” near center galaxy, while others extend to tens kiloparsecs scales. also faint patches emission at large radii (~70 kpc) in HST...
A new successive surface engineering method <italic>via</italic> a dual modification of TiO<sub>2</sub> compact layer by PC<sub>61</sub>BM and C<sub>60</sub>-ETA was developed, affording dramatic efficiency enhancement with suppressed-hysteresis current–voltage response.
Organometal halide CH3NH3PbI3 (MAPbI3) has been commonly used as the light absorber layer of perovskite solar cells (PSCs), and, especially, another element chlorine (Cl) often incorporated to assist crystallization film. However, in most cases, a predominant MAPbI3 phase with trace Cl- is obtained ultimately and role Cl involvement remains unclear. Herein, we develop low-cost facile method, named hydrochloric acid vapor annealing (HAVA) post-treatment, realize rapid conversion phase-pure...
We present a description of the Dragonfly Wide Field Survey (DWFS), deep photometric survey wide area sky. The DWFS covers 330 $\mathrm{deg}^2$ in equatorial GAMA fields and Stripe 82 SDSS $g$ $r$ bands. It is carried out with 48-lens Telephoto Array, telescope that optimized for detection low surface brightness emission. main goal to study dwarf galaxy population beyond Local Group. In this paper, we describe design show early results. reach $1\sigma$ depths $\mu_g\approx 31$ mag...
Two ultra diffuse galaxies in the same group, NGC1052-DF2 and NGC1052-DF4, have been found to little or no dark matter host unusually luminous globular cluster populations. Such low mass objects a group environment are easily disrupted expected show evidence of tidal distortions. In this work we present deep new imaging NGC1052 obtained with Dragonfly Telephoto Array, test hypothesis. We find that both strong position angle twists significantly more elongated at their outskirts than...
By using a facile one-pot nucleophilic addition reaction, we synthesized novel imidazole (IMZ)-functionalized fullerene (C60-IMZ), and applied it as third component of inverted ternary polymer solar cells (PSCs), leading to dramatic efficiency enhancement. According FT-IR, XPS spectroscopic characterizations, elemental analysis, the chemical structure C60-IMZ was determined with average IMZ number estimated be six. The lowest unoccupied molecular orbital (LUMO) level measured by cyclic...
Abstract We present the primary results from Dragonfly Edge-on Galaxies Survey, an exploration of stellar halos twelve nearby ( d < 25 Mpc) edge-on disk galaxies with Telephoto Array. The orientation these allows their to be explored minimal obscuration by or confusion much brighter light. in sample span a range masses 10 9.68 10.88 M ⊙ . confirm that wide halo mass fractions previously seen for Milky Way–mass is also found among less massive spiral galaxies. scatter fraction large, but...
We describe an empirical, self-contained method to isolate faint, large-scale emission in imaging data of low spatial resolution. Multi-resolution filtering (MRF) uses independent superior resolution and point source depth create a model for all compact high surface brightness objects the field. This is convolved with appropriate kernel subtracted from image. The halos bright stars are removed separate step artifacts masked. resulting image only contains extended fainter than pre-defined...
Abstract Uncertainty in the wide-angle point-spread function (PSF) at large angles (tens of arcseconds and beyond) is one dominant sources error a number important quantities observational astronomy. Examples include stellar mass shape galactic halos maximum extent starlight disks nearby galaxies. However, modeling PSF has long been challenge astronomical imaging. In this paper, we present self-consistent method to model images. Scattered light from multiple bright stars fitted...
The metallicity and its relationship with other galactic properties is a fundamental probe of the evolution galaxies. In this work, we select about 750,000 star-forming spatial pixels from 1122 blue galaxies in MaNGA survey to investigate global stellar mass - local surface density gas-phase ($M_*$ $\Sigma_*$ $Z$ ) relation. At fixed $M_*$, increases steeply increasing $\Sigma_*$. Similarly, at $\Sigma_*$, strongly $M_*$ low end, while trend becomes less obvious high end. We find be more...
Abstract The Dragonfly Telephoto Array employs a unique design to detect very large and diffuse galaxies that might be missed with conventional telescopes. Ultrawide Survey (DFUWS) is new wide-field survey will cover 10,000 deg 2 of the northern sky, it provides an ideal data set find these galaxies. From 3100 DFUWS data, we identified 11 large, low surface brightness as pilot sample for spectroscopic follow-up. These are largest in examined area appear smooth isolated, effective radii...
Abstract We present deep g - and r -band imaging of the well-known edge-on galaxy NGC 4565 (the “Needle Galaxy”), observed as part Dragonfly Edge-on Galaxies Survey. The 3 σ local surface brightness contrast limit on 10″ scales is 28.616 ± 0.005 mag arcsec −2 for image 28.936 image. trace galaxy’s starlight in narrow slice profiles spanning over 90 kpc along major axis (with bin sizes ranging from 1.7 × 0.5 to 7.8 kpc) brightnesses below 29 . confirm previously asymmetric disk truncation...
Abstract Unbiased sky background modeling is crucial for the analysis of deep wide-field images, but it remains a major challenge in low surface brightness astronomy. Traditional image processing algorithms are often designed to produce artificially flat backgrounds, erasing astrophysically meaningful structures. In this paper, we present three ideas that can be combined astronomical data preserve accurate representations sky: (1) Use all-sky infrared/submillimeter remove large-scale...
By using phosphorus pentoxide dissolved in methanol as a precursor, we modified graphene oxide (GO) <italic>via</italic> noncovalent phosphorylation for the first time, affording improved hole transport BHJ-PSC devices.
We investigate the spatially-resolved star formation main sequence in star-forming galaxies (SFGs) using Integral Field Spectroscopic (IFS) observations from Mapping Nearby Galaxies at Apache Point Observatory (MaNGA) survey. demonstrate that correlation between stellar mass surface density ($\Sigma_*$) and rate ($\Sigma_{\mathrm{SFR}}$) holds down to sub-galactic scale, leading Sub-Galactic Main Sequence (SGMS). By dividing into two populations based on their recent assembly modes, we find...
Previous findings show that massive ($> 10^{10} M_{sun}$) star-forming (SF) galaxies usually have an inside-out stellar mass assembly mode. In this paper, we for the first time selected a sample of 77 SF with outside-in mode (called targeted sample) from Mapping Nearby Galaxies at Apache Point Observatory (MaNGA) survey. For comparison, two control samples are constructed MaNGA matched in mass: 154 normal and 62 quiescent galaxies. contrast to galaxies, appear be more smooth-like...
Abstract Environmental effects are crucial to the understanding of evolution galaxies in dense environments, such as galaxy clusters. Using large field view SITELLE, unique imaging Fourier transform spectrograph at Canada–France–Hawaii Telescope, we able obtain 2D spectral information for a and complete sample cluster out infall region. We describe pipeline developed identify emission-line (ELGs) from datacube using cross-correlation techniques. present results based on spatial offsets...
Abstract Stellar-mass estimates of massive galaxies are susceptible to systematic errors in their photometry, due extended light profiles. In this study, we use data from the Dragonfly Wide Field Survey accurately measure total luminosities and colors nearby galaxies. The low surface brightness limits survey ( μ g ≈ 31 mag arcsec −2 on a 1′ scale) allow us implement method, based integrating 1D profile, that is minimally dependent any parameterization. We construct sample 1188 with <?CDATA...
We identify a $\sim$600 pc-wide region of active star formation located within tidal streamer M82 via $H\alpha$ emission ($F_{H\alpha}\sim 6.5\times10^{-14}$ erg s$^{-1}$ cm$^{-2}$), using pathfinder instrument based on the Dragonfly Telephoto Array. The object is kinematically decoupled from disk as confirmed Keck / LRIS spectroscopy, and spatially coincident with an overdensity HI molecular hydrogen "northern streamer" induced by passage M81 several hundred Myr ago. From data, we estimate...