A5087260405- Galaxies: Formation, Evolution, Phenomena
- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Smoking Behavior and Cessation
- Adaptive optics and wavefront sensing
- Protein Structure and Dynamics
- Gamma-ray bursts and supernovae
- Simulation Techniques and Applications
- Scientific Research and Discoveries
- Scientific Computing and Data Management
- Astrophysics and Star Formation Studies
- Astrophysical Phenomena and Observations
- Advanced Image Processing Techniques
- Statistical Methods in Clinical Trials
- Advanced Statistical Methods and Models
- Semantic Web and Ontologies
- RNA and protein synthesis mechanisms
- Health Systems, Economic Evaluations, Quality of Life
- Lipid Membrane Structure and Behavior
- Cardiovascular Health and Risk Factors
- Astro and Planetary Science
- Air Quality and Health Impacts
- Impact of Light on Environment and Health
- Bacteriophages and microbial interactions
- Plant Water Relations and Carbon Dynamics
Princeton University
2022-2024
Peking University
2016-2023
Center for Interdisciplinary Studies
2023
Beijing University of Chinese Medicine
2023
China University of Mining and Technology
2023
Kavli Institute for Theoretical Sciences
2021-2022
Yale University
2022
Weatherford College
2022
Abstract It has been shown that ultra-diffuse galaxies (UDGs) have higher specific frequencies of globular clusters, on average, than other dwarf with similar luminosities. The UDG NGC 5846-UDG1 is among the most extreme examples cluster–rich found so far. Here we present new Hubble Space Telescope observations and analysis this galaxy its cluster system. We find hosts 54 ± 9 three to four times more any previously known a luminosity reported in previous studies. With L V ,gal ≈ 6 × 10 7 ⊙ (...
Isolated dwarf galaxies usually exhibit robust star formation but satellite are often devoid of young stars, even in Milky Way-mass groups. Dwarf thus offer an important laboratory the environmental processes that cease formation. We explore balance quiescent and star-forming (quenched fractions) for a sample ~400 around 30 Local Volume hosts from Exploration VolumE Satellites (ELVES) Survey. present quenched fractions as function stellar mass, projected radius, host halo to conclude...
ABSTRACT The Merian survey is mapping ∼ 850 deg2 of the Hyper Suprime-Cam Strategic Survey Program (HSC-SSP) wide layer with two medium-band filters on 4-m Victor M. Blanco telescope at Cerro Tololo Inter-American Observatory, goal carrying first high signal-to-noise (S/N) measurements weak gravitational lensing around dwarf galaxies. This paper presents design filter set: N708 (λc = 7080 Å, Δλ 275 Å) and N540 5400 210 Å). central wavelengths widths were designed to detect $\rm H\alpha$...
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...
The outer light (stellar halos) of massive galaxies has recently emerged as a possible low scatter tracer dark matter halo mass. To test the robustness measurements across different data sets, we compare surface brightness profiles using four independent sets: Hyper Suprime-Cam survey (HSC), Dark Energy Camera Legacy Survey (DECaLS), Sloan Digital Sky (SDSS), and Dragonfly Wide Field (Dragonfly). We use customized pipelines for HSC DECaLS to achieve better sky background subtraction. For at...
Abstract Large diffuse galaxies are hard to find, but understanding the environments where they live, their numbers, and ultimately origins, is of intense interest importance for galaxy formation evolution. Using Subaru’s Hyper Suprime-Cam Strategic Survey Program, we perform a systematic search low surface brightness present novel effective methods detecting modeling them. As case study, surveyed 922 Milky Way analogs in nearby Universe (0.01 < z 0.04) built large sample satellite that...
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...
Abstract We present the statistical redshift distribution of a large sample low-surface-brightness (LSB) galaxies identified in first 200 deg 2 Hyper Suprime-Cam Strategic Survey Program. Through cross-correlation with NASA–SDSS Atlas, we find that majority objects lie within z < 0.15 or ∼500 Mpc, yielding mass range M * ≈ 10 7 −10 9 ⊙ and size r eff, g 1−8 kpc. peak distance 100 corresponding mostly to ∼10 fall on known mass–size relation. There is also tail out 0.15, comprising more...
Abstract We present PopSED , a framework for the population-level inference of galaxy properties from photometric data. Unlike traditional approach first analyzing individual galaxies and then combining results to determine physical entire population, we directly make population distribution objective. train normalizing flows approximate by minimizing Wasserstein distance between synthetic photometry observed validate our method using mock observations apply it GAMA survey. reliably recovers...
Abstract The causative pathogen of coronavirus disease 2019 (COVID‐19), severe acute respiratory syndrome 2 (SARS‐CoV‐2), is an enveloped virus assembled by a lipid envelope and multiple structural proteins. In this study, integrating experimental data, modeling, as well coarse‐grained all‐atom molecular dynamics simulations, we constructed multiscale models SARS‐CoV‐2. Our 500‐ns simulation the intact virion allowed us to investigate dynamic behavior membrane‐embedded proteins surrounding...
The rapid development of deep learning-based methods has considerably advanced the field protein structure prediction. accuracy predicting 3D structures simple proteins is comparable to that experimentally determined structures, providing broad possibilities for structure-based biological studies. Another critical question whether and how multistate can be predicted from a given sequence. In this study, analysis tens two-state demonstrated contact map predictions contain structural...
Abstract The cold interstellar medium (ISM) as the raw material for star formation is critical to understanding galaxy evolution. It generally understood that galaxies stop making stars when, in one way or another, they run out of gas. However, here we provide evidence central spiral remain rich atomic gas even if their rate (SFR) and molecular fraction have dropped significantly compared “normal” star-forming same mass. Since H i sensitive external processes, investigate using a combined...
Abstract It is well known that almost all isolated dwarf galaxies are actively forming stars. We report the discovery of dw1322m2053 (nicknamed Hedgehog), an quiescent galaxy at a distance 2.40 ± 0.15 Mpc with stellar mass M ⋆ ≈ 10 5.8 ⊙ . The measured using surface brightness fluctuations both Legacy Surveys and deep Magellan/IMACS imaging data. Hedgehog 1.7 from nearest group, Centaurus A, has no neighboring within 1 Mpc, making it one most this mass. red optical color early-type...
Abstract Recent observations have reignited interest in a population of dwarf galaxies that are large and diffuse for their mass, often called ultra-diffuse (UDGs). However, the origin evolution these mass–size outliers role environment still unclear. Using exquisitely deep wide Hyper Suprime-Cam Strategic Survey images, we search ultra-puffy (UPGs), defined as being 1.5 σ larger than average size around Milky Way–like galaxies. We present sizes radial distributions derive quenched fraction...
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...
The Merian survey is mapping $\sim$ 850 degrees$^2$ of the Hyper Suprime-Cam Strategic Survey Program (HSC-SSP) wide layer with two medium-band filters on 4-meter Victor M. Blanco telescope at Cerro Tololo Inter-American Observatory, goal carrying first high signal-to-noise (S/N) measurements weak gravitational lensing around dwarf galaxies. This paper presents design filter set: N708 ($\lambda_c = 7080 \unicode{x212B}$, $\Delta\lambda 275\unicode{x212B}$) and N540 5400\unicode{x212B}$,...
Since reconciliation was first described more than 20 years ago, a large number of postconflict behaviors have been observed among females in many polygynous primate species. However, few studies conducted males, perhaps due to the rarity with which they maintain friendly relationships one another and their aggressive competition for resources. Although this is true Sichuan snub-nosed monkeys Rhinopithecus roxellana represent potential exception as male cooperation has known occur. In study,...
Abstract The causative pathogen of Coronavirus disease 2019 (COVID-19), severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), is an enveloped virus assembled by a lipid envelope and multiple structural proteins. In this study, integrating experimental data, modeling, coarse-grained molecular dynamics simulations, we constructed multiscale models SARS-CoV-2. Our 500-ns simulation the intact virion allowed us to investigate dynamic behavior membrane-embedded proteins surrounding...
Abstract Black hole feedback has been widely implemented as the key recipe to quench star formation in massive galaxies modern semianalytic models and hydrodynamical simulations. As theoretical details surrounding accretion of black holes continue be refined, various have across simulations, with notable differences their outcomes. Yet, most these simulations successfully reproduced some observations, such stellar mass function rate density local universe. We use recent observation change...
Protoplanetary disks are the sites of vigorous hydrodynamic processes, such as accretion and outflows, ultimately establish conditions for formation planets. The properties disk outflows often inferred through analysis forbidden emission lines. These lines contain multiple overlapping components, tracing different regions with processes that excite them: a high-velocity component (tracing jet), broad low-velocity inner wind), narrow outer wind). They also heavily contaminated by background...