Yicheng Guo
A5071424985- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Gamma-ray bursts and supernovae
- Stellar, planetary, and galactic studies
- Astrophysics and Star Formation Studies
- Astrophysical Phenomena and Observations
- Scientific Research and Discoveries
- CCD and CMOS Imaging Sensors
- Adaptive optics and wavefront sensing
- Radio Astronomy Observations and Technology
- Astrophysics and Cosmic Phenomena
- Astronomical Observations and Instrumentation
- Cosmology and Gravitation Theories
- SARS-CoV-2 and COVID-19 Research
- Advanced Vision and Imaging
- Plant Water Relations and Carbon Dynamics
- Advanced Frequency and Time Standards
- Laser Material Processing Techniques
- Graphite, nuclear technology, radiation studies
- Geophysics and Sensor Technology
- Atomic and Subatomic Physics Research
- Viral gastroenteritis research and epidemiology
- Animal Virus Infections Studies
- Advancements in Battery Materials
- Leaf Properties and Growth Measurement
Aaron Diamond AIDS Research Center
2022-2025
Columbia University
2022-2025
University of Missouri
2018-2024
Army Medical University
2022-2024
Southwest Hospital
2022-2024
Tsinghua University
1999-2023
China University of Mining and Technology
2022-2023
Shenyang Agricultural University
2023
Beijing University of Technology
2019-2021
Jiangsu University
2019-2020
The Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey (CANDELS) is designed to document the first third of galactic evolution, over approximate redshift (z) range 8--1.5. It will image >250,000 distant galaxies using three separate cameras on Hubble Space Telescope, from mid-ultraviolet near-infrared, and find measure Type Ia supernovae at z>1.5 test their accuracy as standardizable candles for cosmology. Five premier multi-wavelength sky regions are selected, each with...
This paper describes the Hubble Space Telescope imaging data products and reduction procedures for Cosmic Assembly Near-IR Deep Extragalactic Legacy Survey (CANDELS). survey is designed to document evolution of galaxies black holes at $z\sim1.5-8$, study Type Ia SNe beyond $z>1.5$. Five premier multi-wavelength sky regions are selected, each with extensive multiwavelength observations. The primary CANDELS consist obtained in Wide Field Camera 3 / infrared channel (WFC3/IR) UVIS channel,...
We analyze the dependence of galaxy structure (size and Sersic index) mode star formation (\Sigma_SFR SFR_IR/SFR_UV) on position galaxies in SFR versus Mass diagram. Our sample comprises roughly 640000 at z~0.1, 130000 z~1, 36000 z~2. Structural measurements for all but z~0.1 were based HST imaging, SFRs are derived using a Herschel-calibrated ladder indicators. find that correlation between stellar population (i.e., 'Hubble sequence') is already place since least z~2.5. At epochs, typical...
We present a UV-to-mid infrared multi-wavelength catalog in the CANDELS/GOODS-S field, combining newly obtained CANDELS HST/WFC3 F105W, F125W, and F160W data with existing public data. The is based on source detection WFC3 band. mosaic includes from deep wide observations as well previous ERS HUDF09 programs. reaches 5$\sigma$ limiting depth (within an aperture of radius 0.17 arcsec) 27.4, 28.2, 29.7 AB for wide, deep, HUDF regions, respectively. contains 34930 sources representative 50%...
We present global structural parameter measurements of 109,533 unique, H_F160W-selected objects from the CANDELS multi-cycle treasury program. Sersic model fits for these are produced with GALFIT in all available near-infrared filters (H_F160W, J_F125W and, a subset, Y_F105W). The parameters best-fitting models (total magnitude, half-light radius, index, axis ratio, and position angle) made public, along newly constructed point spread functions each field filter. Random uncertainties...
We combine high-resolution HST/WFC3 images with multi-wavelength photometry to track the evolution of structure and activity massive (log(M*) > 10) galaxies at redshifts z = 1.4 - 3 in two fields Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey (CANDELS). detect compact, star-forming (cSFGs) whose number densities, masses, sizes, star formation rates qualify them as likely progenitors quiescent, (cQGs) 1.5 3. At 2 most cSFGs have specific star-formation (sSFR 10^-9 yr^-1) half...
Using HST/WFC3 imaging taken as part of the Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey (CANDELS), we examine role that major galaxy mergers play in triggering active galactic nuclei (AGN) activity at z~2. Our sample consists 72 moderate-luminosity (Lx ~ 1E42-1E44 erg/s) AGN 1.5<z<2.5 are selected using 4 Msec Chandra observations Field South, deepest X-ray to date. Employing visual classifications, have analyzed rest-frame optical morphologies host galaxies and compared...
We perform a detailed analysis of the resolved colors and stellar populations complete sample 323 star-forming galaxies at 0.5 < z 1.5, 326 1.5 2.5 in ERS CANDELS-Deep region GOODS-South. Galaxies were selected to be more massive than 10^10 Msun have specific star formation rates above 1/t_H. model 7-band optical ACS + near-IR WFC3 spectral energy distributions individual bins pixels, accounting simultaneously for galaxy-integrated photometric constraints available over longer wavelength...
We present the multiwavelength - ultraviolet to mid-infrared catalog of UKIDSS Ultra-Deep Survey (UDS) field observed as part Cosmic Assembly Near-infrared Deep Extragalactic Legacy (CANDELS). Based on publicly available data, includes: CANDELS data from Hubble Space Telescope (near-infrared WFC3 F125W and F160W visible ACS F606W F814W data), u-band CFHT/Megacam, B, V, Rc, i' z' band Subaru/Suprime-Cam, Y Ks VLT/HAWK-I, J, H K bands (Data Release 8), Spitzer/IRAC (3.6, 4.5 SEDS, 5.8 8.0um...
We measure new estimates for the galaxy stellar mass function and star formation rates samples of galaxies at z ∼ 4, 5, 6 7 using data in CANDELS GOODS South field. The deep near-infrared observations allow us to construct ≥ directly first time. estimate masses our sample by fitting observed spectral energy distributions with synthetic populations, including nebular line continuum emission. UV luminosity functions are consistent previous observations; however, we find that MUV-M* relation...
The galaxy stellar mass function (GSMF) at high-z provides key information on star-formation history and assembly in the young Universe. We aimed to use unique combination of deep optical/NIR/MIR imaging provided by HST, Spitzer VLT CANDELS-UDS, GOODS-South, HUDF fields determine GSMF over redshift range 3.5<z<7.5. utilised HST WFC3/IR NIR from CANDELS HUDF09, reaching H~27-28.5 a total area 369 arcmin2, with associated ACS optical data, IRAC SEDS programme, Y K-band Hawk-I images HUGS...
We present the public release of stellar mass catalogs for GOODS-S and UDS fields obtained using some deepest near-IR images available, achieved as part Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey project. combine effort from 10 different teams, who computed masses same photometry redshifts. Each team adopted their preferred fitting code, assumptions, priors, parameter grid. The combination results underlying isochrones reduces systematics associated with code other...
We present results from the Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey (CANDELS) photometric redshift methods investigation. In this investigation, eleven participants, each using a different combination of code, template spectral energy distributions (SEDs) and priors, are used to examine properties redshifts applied deep fields with broad-band multi-wavelength coverage. The photometry includes U-band through mid-infrared filters was derived TFIT method. Comparing...
Although giant clumps of stars are thought to be crucial galaxy formation and evolution, the most basic demographics still uncertain, mainly because definition has not been thoroughly discussed. In this paper, we carry out a study in star-forming galaxies at 0.5 < z 3, using our proposed physical that UV-bright discrete regions individually contribute more than 8% rest-frame UV light their galaxies. Clumps defined way significantly brighter H ii nearby large spiral galaxies, either or...
ABSTRACT We present galaxy stellar mass functions (GSMFs) at z = 4–8 from a rest-frame ultraviolet (UV) selected sample of ∼4500 galaxies, found via photometric redshifts over an area ∼280 arcmin 2 in the Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey (CANDELS)/Great Observatories Origins (GOODS) fields and Hubble Ultra Field. The deepest Spitzer /IRAC data to date relatively large volume allow us place better constraint both low- high-mass ends GSMFs compared previous...
We propose that the ultra-diffuse galaxy (UDG) population represents a set of satellite galaxies born in ∼1010−1011 M⊙ haloes, similar to field dwarfs, which suffer dramatic reduction surface brightness due tidal stripping and heating. This scenario is observationally motivated by radial alignment UDGs Coma as well significant dependence UDG abundance on cluster mass. As test this formation scenario, we apply semi-analytic model describing change stellar mass half-light radius dwarf...
Galaxy mergers are expected to have a significant role in the mass assembly of galaxies early Universe, but there very few observational constraints on merger history at $z>2$. We present first study galaxy major (mass ratios $>$ 1:4) mass-selected samples out $z\approx6$. Using all five fields HST/CANDELS survey and probabilistic pair count methodology that incorporates full photometric redshift posteriors corrections for stellar completeness, we measure pair-counts projected separations...
Excessive extracellular matrix deposition drives fibroblasts into a state of high mechanical stress, exacerbating pathological fibrosis and hypertrophic scar formation, leading to tissue dysfunction. This study reports minimally invasive convenient approach obtaining scarless using silk fibroin microneedle patch (SF MNs). We found that by tuning the MN size density only, biocompatible MNs significantly decreased elevation index in rabbit ear model increased ultimate tensile strength close...
Abstract We investigate the stellar populations for a sample of 161 massive, mainly quiescent galaxies at 〈 z obs 〉 = 0.8 with deep Keck/DEIMOS rest-frame optical spectroscopy (HALO7D survey). With fully Bayesian framework Prospector , we simultaneously fit spectroscopic and photometric data an advanced physical model (including nonparametric star formation histories, emission lines, variable dust attenuation law, active galactic nucleus emission), together uncertainty outlier model. show...
Abstract The study of galaxy evolution hinges on our ability to interpret multiwavelength observations in terms their physical properties. To do this, we rely spectral energy distribution (SED) models, which allow us infer parameters from spectrophotometric data. In recent years, thanks wide and deep multiwave band surveys, the volume high-quality data have significantly increased. Alongside increased data, algorithms performing SED fitting improved, including better modeling prescriptions,...
The recently dominant SARS-CoV-2 Omicron JN.1 has evolved into multiple sublineages, with recurrent spike mutations R346 T, F456L, and T572I, some of which exhibit growth advantages, such as KP.2 KP.3. We investigated these in JN.1, examining their individual combined effects on immune evasion, ACE2 receptor affinity, vitro infectivity. F456L increased resistance to neutralization by human sera, including those after breakthrough infections, RBD class-1 monoclonal antibodies, significantly...
Using the SDSS DR4 group catalogue of Yang et al. (2007), we investigate sizes, concentrations, colour gradients and surface brightness profiles central satellite galaxies. We compare galaxies at fixed stellar mass, in order to disentangle environmental from mass dependencies. Early late type are defined according concentration. find that have smaller radii larger concentrations than No such differences found for early-type also constructed our sample. late-type a lower redder colours show...
To automate source detection, two-dimensional light-profile Sersic modelling and catalogue compilation in large survey applications, we introduce a new code GALAPAGOS, Galaxy Analysis over Large Areas: Parameter Assessment by GALFITting Objects from SExtractor. Based on single setup, GALAPAGOS can process complete set of images. It detects sources the data, estimates local sky background, cuts postage stamp images for all sources, prepares object masks, performs fitting including neighbours...
We present a 0.4-8$\mu$m multi-wavelength photometric catalog in the Extended Groth Strip (EGS) field. This is built on Hubble Space Telescope (HST) WFC3 and ACS data from Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey (CANDELS), it incorporates existing HST All-wavelength strip International (AEGIS) 3D-HST program. The based detections F160W band reaching depth of F160W=26.62 AB (90% completeness, point-sources). It includes photometry for 41457 objects over an area $\approx...
We identify an abundant population of extreme emission-line galaxies (EELGs) at redshift z ∼ 1.7 in the Cosmic Assembly Near-IR Deep Extragalactic Legacy Survey imaging from Hubble Space Telescope/Wide Field Camera 3 (HST/WFC3). Sixty-nine EELG candidates are selected by large contribution exceptionally bright emission lines to their near-infrared broadband magnitudes. Supported spectroscopic confirmation strong [O iii] lines—with rest-frame equivalent widths ∼1000 Å—in four that have...