A5063485373- Galaxies: Formation, Evolution, Phenomena
- Astrophysics and Cosmic Phenomena
- Stellar, planetary, and galactic studies
- Astrophysical Phenomena and Observations
- Astrophysics and Star Formation Studies
- Gamma-ray bursts and supernovae
- Pulsars and Gravitational Waves Research
- Dark Matter and Cosmic Phenomena
- Astronomy and Astrophysical Research
- Neutrino Physics Research
- Cold Atom Physics and Bose-Einstein Condensates
- Geophysical and Geoelectrical Methods
- Radio Astronomy Observations and Technology
- Particle Accelerators and Free-Electron Lasers
- Advancements in Battery Materials
- Pediatric Urology and Nephrology Studies
- Astro and Planetary Science
- Wastewater Treatment and Nitrogen Removal
- Supercapacitor Materials and Fabrication
- Medical Imaging and Pathology Studies
- Medical Imaging Techniques and Applications
- Earthquake Detection and Analysis
- Quantum, superfluid, helium dynamics
- Cosmology and Gravitation Theories
- Urological Disorders and Treatments
Xiamen University
2023-2024
Nanjing University
2012-2023
University of Science and Technology Liaoning
2023
University of Alabama in Huntsville
2018-2022
Purple Mountain Observatory
2018-2022
University of Chinese Academy of Sciences
2021
University of Massachusetts Amherst
2015-2016
Previous studies have revealed a population of galaxies in galaxy clusters with ram pressure stripped (RPS) tails gas and embedded young stars. We observed 1.4 GHz continuum HI emission the Very Large Array its B-configuration two fields Coma cluster to study radio properties RPS galaxies. The best sensitivities are 6 8 $μ$Jy per 4'' beam respectively, which 4 3 times deeper than those previously published. Radio found 10 (8 new) out 20 galaxies, unambiguously revealing presence relativistic...
Abstract Recently, the High Altitude Water Cherenkov (HAWC) collaboration reported discovery of a TeV halo around Geminga pulsar. The emission is believed to originate from inverse Compton scattering pulsar-injected electrons/positrons off cosmic microwave background photons. During this time, these electrons should inevitably radiate X-ray photons via synchrotron radiation, providing useful constraint on magnetic field in halo. In work, we analyze data XMM-Newton and Chandra , obtain an...
Abstract Most galaxies follow a well-defined scaling relation between metallicity and stellar mass; however, some outliers at the low-mass end of observed galaxy population exhibit unusually high for their mass. Understanding how these objects get to be so metal-rich is vital understanding role feedback in formation. Using TNG50 simulation, we explore origins this phenomenon. We identify 227 metal-rich, compact systems (CSSs) that deviate significantly from relation. These CSSs are...
We have observed the late-type peculiar galaxy NGC 4424 during VESTIGE, a blind narrow-band Halpha[NII] imaging survey of Virgo cluster carried out with MegaCam at CFHT. The presence 110 kpc long HI tail in S direction indicates that this is undergoing ram pressure stripping event. deep image revealed low surface brightness ionised gas ~10 extending from centre to NW direction, opposite tail. Chandra and XMM X-rays data do not show any compact source nucleus nor an extended hot gas, while...
HESS J1809-193 is an extended TeV $\gamma$-ray source and the origin of its emission remains ambiguous. Pulsar wind nebula (PWN) PSR J1809-1917 laying inside a possible candidate. Powered by central pulsar, ultrarelativistic electrons in PWN can produce radio to X-ray through synchrotron inverse Compton (IC) scattering. To check whether this counterpart J1809-193, we analyzed Chandra radial intensity profile spectral index PWN. We then adopt one-zone isotropic diffusion model fit keV data....
Abstract Various observations are revealing the widespread occurrence of fast and powerful winds in active galactic nuclei (AGNs) that distinct from relativistic jets, likely launched accretion disks interacting strongly with gas their host galaxies. During interaction, strong shocks expected to form can accelerate nonthermal particles high energies. Such have been suggested be responsible for a large fraction observed extragalactic gamma-ray background (EGB) diffuse neutrino background, via...
We use a complete sample of 38 richest maxBCG clusters to study the ICM-galaxy scaling relations and halo mass selection properties algorithm, based on X-ray optical observations. The are selected from two largest bins richness in Planck stacking work with $N_{200} \geq 78$. analyze their Chandra XMM-Newton data derive ICM. then distribution $P(X|N)$, $X=T_X,\ L_X,\ Y_X$, $P(M|N)$ maxBCG. Compared previous works whole sample, significant fraction blended systems boosted is skewed into this...
We have initiated a program to study the baryon content and dynamic state of galaxy clusters. Here we present results primarily from XMM-Newton observations two optically-selected clusters, A1095 ($z \simeq 0.210$) A1926 0.136$). find that both them are actually cluster pairs at similar redshifts. characterize temperatures these individual clusters through X-ray spectral fits then estimate their gravitational masses. show rich set substructures, including large position offsets between...
We study the unresolved X-ray emission in three Local Group dwarf elliptical galaxies (NGC 147, NGC 185 and 205) using XMM-Newton observations, which most likely originates from a collection of weak sources, mainly cataclysmic variables coronally active binaries. Precise knowledge this stellar is crucial not only for understanding relevant astrophysics but also disentangling quantifying thermal diffuse hot gas nearby galaxies.We find that integrated emissivities individual ellipticals agree...
Multi-wavelength observations show that Abell 1367 (A1367) is a dynamically young cluster, with at least two subclusters merging along the SE-NW direction. With wide-field XMM-Newton mosaic of A1367, we discover previously unknown merger shock NW edge cluster. We estimate Mach number from density and temperature jumps as $M_{\rho}=1.21\pm0.08$ $M_T=1.60\pm0.07$, respectively. This region also corresponds to radio relic discovered VLA GBT, which could be produced by re-acceleration...
Recent studies have highlighted the potential significance of intracluster medium (ICM) clumping and its important implications for cluster cosmology baryon physics. Many ICM clumps can originate from infalling galaxies, as stripped interstellar (ISM) mixing into hot ICM. However, a direct connection between ISM has not been unambiguously established before. Here we present discovery first still only known isolated cloud (or orphan cloud, OC) detected in both X-rays H$\alpha$ nearby Abell...
We present the results of deep Chandra and XMM-Newton observations a complex merging galaxy cluster Abell 2256 (A2256) that hosts spectacular radio relic (RR). The temperature metallicity maps show clear evidence merger between western subcluster (SC) primary (PC). detect five X-ray surface brightness edges. Three them near center are cold fronts (CFs): CF1 is associated with infalling SC; CF2 located in east PC; CF3 to west PC core. other two edges at outskirts shock (SFs): SF1 RR NW has...
We present results from a deep (174 ks) Chandra observation of the FR-II radio galaxy 3C 220.1, central brightest cluster (BCG) $kT \sim$ 4 keV at $z=0.61$. The temperature hot medium drops $\sim5.9$ to $\sim3.9$ $\sim$ 35 kpc radius, while smaller radii may be substantially lower. active galactic nucleus (AGN) outshines whole in X-rays, with bolometric luminosity $2.0\times10^{46}$ erg s$^{-1}$ ($\sim10$% Eddington rate). system shows pair potential X-ray cavities $\sim35$ east and west...
•Nonthermal X-ray emission is discovered from the SNR G106.3+2.7•X-ray observations indicate a high velocity of shock in tail region, which expanding low-density hydrogen cavity•The enables acceleration PeV protons, are also needed to interpret multiwavelength spectrum region•SNR G106.3+2.7 likely long-sought source Galactic cosmic rays Supernova remnants (SNRs) have long been considered as one most promising sources rays. In paradigm, petaelectronvolt (PeV) proton may only be feasible at...
ABSTRACT Galaxy clusters grow primarily through the continuous accretion of group-scale haloes. Group galaxies experience preprocessing during their journey into clusters. A star-bursting compact group, Blue Infalling (BIG), is plunging nearby cluster A1367. Previous optical observations reveal rich tidal features in BIG members, and a long H α trail behind. Here, we report discovery projected ∼250 kpc X-ray tail behind using Chandra XMM–Newton observations. The total hot gas mass ∼7 × 1010...
When subhalos infall into galaxy clusters, their gas content is ram pressure stripped by the intracluster medium (ICM) and may turn cometary tails. We report discovery of two spectacular X-ray double tails in a single cluster, Z8338, revealed 70 ks Chandra observations. The brighter one, with an bolometric luminosity $3.9 \times 10^{42}{\rm\ erg\ s}^{-1}$, detached tail from host halo extended at least 250 kpc projection. head cool core front tip cold $\sim$ 30 away nucleus its former...
Abell 407 (A407) is a unique galaxy cluster hosting central compact group of nine galaxies (named as 'Zwicky's Nonet'; G1 - G9 in this work) within 30 kpc radius region. The core also hosts luminous radio active galactic nucleus (AGN), 4C 35.06 with helically twisted jets extending over 200 kpc. With 44 ks Chandra observation A407, we characterize the X-ray properties its intracluster medium (ICM) and galaxies. mean temperature A407 2.7 keV $M_{200}$ $1.9 \times 10^{14} {M_{\odot}}$. We...
We have initiated a programme to study the physical/dynamical state of gas in galaxy clusters and impact cluster environment on gaseous halos individual galaxies using X-ray imaging UV absorption line spectroscopy background QSOs. Here we report results from analysis Chandra XMM-Newton archival data five with such QSOs, one which has an spectrum. characterize gravitational masses dynamical states, as well hot intracluster medium (ICM) properties these clusters. Most are dynamically disturbed...
We report the detection of CO emission in recently discovered multiphase isolated gas cloud nearby galaxy cluster Abell 1367. The is located about 800 kpc projection from center and at a projected distance > 80 any galaxy. It first only known intra-cluster detected X-ray, H$\alpha$, emission. found total $2.2\times 10^8 M_\odot$ H$_2$ with IRAM 30-m telescope two regions, one associated peak H$\alpha$ another X-ray surrounded by weak filaments. velocity molecular offset underlying 100 km...
In this paper, we constrain the density of interstellar medium (ISM) around hadronic PeVatron candidate, supernova remnant (SNR) G106.3+2.7, based on X-ray and $\gamma$-ray observations. The purpose investigation is to understand influence gaseous environment SNR as a proton candidate. By modelling self-regulated propagation CRs injected from SNR, calculate emission via hadronuclear interactions with molecular cloud ISM, use measured flux ISM SNR. Our results support picture that expanding...
ABSTRACT In this paper, we constrain the density of interstellar medium (ISM) around hadronic PeVatron candidate, supernova remnant (SNR) G106.3+2.7, based on X-ray and γ-ray observations. The purpose investigation is to understand influence gaseous environment SNR as a proton candidate. By modelling self-regulated propagation cosmic rays (CRs) injected from SNR, calculate emission CRs via hadronuclear interactions with molecular cloud ISM, use measured flux ISM SNR. Our results support...
Pulsar halos (also termed 'TeV halo') are a new class of $\gamma$-ray sources in Galaxy, which manifest as extended emission around middle-age pulsars, discovered the Geminga pulsar, Monogem pulsar and PSR~J0622+3749 by HAWC LHAASO. A consensus has been reached that TeV comes from inverse Compton scattering escaping electrons/positrons PWN off soft background radiation field, while particle transport mechanism halo is still dispute. Currently, there mainly three interpretations, namely,...