A5076214679- Galaxies: Formation, Evolution, Phenomena
- Astrophysics and Cosmic Phenomena
- Astrophysical Phenomena and Observations
- Astronomical Observations and Instrumentation
- Astronomy and Astrophysical Research
- Gamma-ray bursts and supernovae
- Pulsars and Gravitational Waves Research
- Manufacturing Process and Optimization
- Dark Matter and Cosmic Phenomena
- 3D Shape Modeling and Analysis
- Astrophysics and Star Formation Studies
- Advanced Measurement and Metrology Techniques
- Radio Astronomy Observations and Technology
- Stellar, planetary, and galactic studies
- Cosmology and Gravitation Theories
- Market Dynamics and Volatility
- Financial Risk and Volatility Modeling
- Complex Systems and Time Series Analysis
Max Planck Institute for Extraterrestrial Physics
2005-2024
Brera Astronomical Observatory
2023
Nanjing University
2018-2022
Max Planck Society
2005
We aim at characterizing the hot phase of Circum-Galactic Medium in a large sample galaxies. stack X-ray events from SRG/eROSITA eFEDS survey around central galaxies GAMA 9hr field to construct radially projected soft luminosity profiles as function their stellar mass and specific star formation rate. consider samples quiescent (star-forming) range $2\times 10^{10}$ -- $10^{12}$ M$_\odot$ ($3\times 10^9$ $6\times10^{11}$ M$_\odot$). For galaxies, are clearly extended throughout available...
Context . Massive black holes (MBHs) are typically hosted in the centres of massive galaxies but they appear to become rarer lower mass galaxies, where nuclear star clusters (NSCs) frequently instead. The transition region, both an MBH and NSC can co-exist, has been poorly studied date only a few dozen known host them. One avenue for detecting new with is look accretion signatures MBHs. Aims Here, we use SRG/eROSITA all-sky survey eRASS:4 data search X-ray accreting MBHs NSCs, while also...
We apply a stacking technique to gain enough statistics detect the hot CGM around galaxies. use X-ray data from first four SRG/eROSITA all-sky surveys (eRASS:4). discuss how satellite galaxies could bias and carefully build central galaxy samples based on SDSS spectroscopic survey halo-based group finder algorithm isolated sample ninth release of DESI Legacy (LS DR9, photometric). mask detected point sources model emission unresolved active galactic nuclei (AGN) binaries (XRB) obtain CGM....
Aims. Understanding how the properties of galaxies relate to hot circum-galactic medium (CGM) around them can constrain galaxy evolution models. We aim measure scaling relations between X-ray luminosity CGM and fundamental (stellar mass halo mass) a galaxy. Methods. measured based on surface brightness profiles central samples from Spectrum Roentgen Gamma (SRG)/eROSITA all-sky survey data. related galaxies’ stellar mass, we compared observed self-similar model intrinsic (i.e., not...
Context. The circumgalactic medium (CGM) provides the material needed for galaxy formation and influences evolution. hot ( T > 10 6 K ) CGM is poorly detected around galaxies with stellar masses M * lower than 3 × 11 ⊙ due to low surface brightness. Aims. We aim detect X-ray emission from Milky Way-mass (MW-mass, log( / = 10.5 − 11.0) M31-mass (log( 11.0 11.25) galaxies, in addition measuring brightness profile of CGM. Methods. applied a stacking technique gain enough statistics used data...
The hot phase of the circumgalactic medium (CGM) allows us to probe inflow and outflow gas responsible for dictating evolution a galaxy's structure. Studying CGM sheds light on physical properties baryons, which is crucial inform constrain simulation models. With recent advances in observational measurements probing X-rays thermal Sunyaev-Zeldovich (tSZ), we have new avenue widening our knowledge physics feedback. In this paper, use TNG300 hydrodynamical simulations build fully...
Context. eROSITA will deliver an unprecedented volume of X-ray survey observations, 20 − 30 times more sensitive than ROSAT in the soft band (0.5 2.0 keV) and for first time imaging hard (2 10 keV). The final observed catalogue sources include galaxy clusters groups along with obscured unobscured (active galactic nuclei) AGNs. This calls a powerful theoretical effort to mitigate potential systematics biases that may influence data analysis. Aims. We investigate detection technique selection...
The SRG/eROSITA All-Sky Surveys (eRASSs) combine the advantages of complete sky coverage and energy resolution provided by charge couple device offer most holistic detailed view diffuse soft X-ray background (SXRB) to date. first eRASS (eRASS1) was completed at solar minimum, when wind exchange emission minimal, providing clearest SXRB. We aim extract spatial spectral information from each constituent SXRB in western Galactic hemisphere, focusing on local hot bubble (LHB). extracted analysed...
The eROSITA will deliver an unprecedented volume of X-ray survey observations, 20-30 times more sensitive than ROSAT in the soft band (0.5-2 keV) and for first time imaging hard (2-10 including galaxy clusters groups along with obscured unobscured AGNs. This calls a powerful theoretical effort to control systematics biases that may affect data analysis. We investigate detection technique selection effects group AGN populations mock at depth eRASS:4. create $30\times 30$ deg$^{2}$ observation...
A Chandra follow-up observation of an X-ray-luminous galaxy cluster with a compact appearance, RXC J1504.1-0248, discovered in our REFLEX Cluster Survey, reveals object one the most prominent cooling cores. β-model fit to X-ray surface brightness profile gives core radius ~30 h kpc, which is much smaller than ~140 kpc. As consequence, more 70% high luminosity Lbol = 4.3 × 1045 ergs s-1 this radiated inside radius. simple modeling morphology leads formal mass deposition rate within classical...
Abstract Recently, gamma-ray halos of a few degree extension have been detected around two middle-aged pulsars, namely, Geminga and PSR B0656+14, by the High Altitude Water Cherenkov observatory (HAWC). The radiation arises from relativistic electrons that escape pulsar wind nebula diffuse in surrounding medium. diffusion coefficient is found to be significantly lower than average value Galactic disk. If so, given typical transverse velocity 300–500 km s −1 for pulsar, its displacement could...
This study examines the average X-ray properties of massive halos at z< 0.2, covering largest halo mass range to date, from Milky Way-like clusters. The analysis is based on stacking in eFEDS area GAMA galaxy group sample, validated with synthetic data that mimic observed eROSITA and optical using Magneticum lightcones. Stacking was conducted bins tested for AGN binary contamination, systematics proxy, uncertainties centers. provides surface brightness profiles six bins, spanning systems...
The detection of extended TeV $\gamma$-ray emission (dubbed "TeV halos") from Geminga and Monogem pulsars by HAWC collaboration implies that the halo-like morphologies around middle-aged may be common. $\gamma$-rays above 10 are thought to arise inverse Compton (IC) scattering relativistic electrons/positrons in pulsar halos off cosmic microwave background photons. In meanwhile, these electrons positrons can produce X-ray synchrotron interstellar magnetic field, resulting a diffuse band...
Abstract We introduce the New-ANGELS program, an XMM-Newton survey of a ∼7.2 deg 2 area around M31, which aims to study X-ray populations in M31 disk and X-ray-emitting hot gas inner halo up 30 kpc. In this first paper, we report catalog 4506 detected sources attempt cross-identify or roughly classify them. identify 352 single stars foreground, 35 globular clusters, 27 supernova remnants associated with as well 62 active galactic nuclei, 59 galaxies, one galaxy cluster background. uniquely...
It has been found that there is a quasi-linear scaling relationship between the gamma-ray luminosity in GeV energies and total infrared of star-forming galaxies, i.e. $L_{\gamma}\propto L_{\rm IR}^{\alpha}$ with $\alpha\simeq 1$. However, origin this linear slope not well understood. Although extreme starburst galaxies can be regarded as calorimeters for hadronic cosmic ray interaction thus may hold, it case low star-formation-rate (SFR) majority rays these are expected to escape. We...
One of the biggest mysteries in modern cosmology and galaxy formation is hideout "missing baryons". The leading theory predicts that a huge amount baryons resides around galaxies extending out to their virial radii form diffuse hot gas $10^6-10^7\,$K, which also known as major component circumgalactic medium (CGM). Studies by various groups via different techniques, however, have not reached consensus on role CGM accounting for missing baryons, with estimated contribution ranging from minor...
The hot phase of the circumgalactic medium (CGM) allows us to probe inflow and outflow gas within a galaxy, which is responsible for dictating evolution galaxy. Studying CGM sheds light on better understanding physics, crucial inform constrain simulation models. With recent advances in observational measurements probing X-rays tSZ, we have new avenue widening our knowledge physics feedback by exploiting information from current/future observations. In this paper, use TNG300 hydrodynamical...
Understanding how the hot circum-galactic medium (CGM) properties relate to galaxy's can constrain galaxy evolution models. We aim measure scaling relations between X-ray luminosity of CGM and fundamental a galaxy, i.e., its stellar mass halo mass. calculate based on surface brightness profiles central samples measured in Zhang et al. (2024a, submitted) from Spectrum Roentgen Gamma (SRG)/eROSITA all-sky survey data. galaxies' compare observed TNG, EAGLE, SIMBA simulations. The correlates...
Abstract High-energy cosmic rays (CRs) can be accelerated in the relativistic jets of active galactic nuclei (AGNs) powered by supermassive black holes. The baryon loading efficiency onto CR baryons from accreting holes is poorly constrained observations so far. In this paper, we suggest that γ -ray emission galaxy clusters used to study factor AGN jets, since CRs injected are completely confined and sufficiently interact with intracluster medium via a hadronic process, producing diffuse...
Recent studies have demonstrated that the emission from circumgalactic medium of Milky Way displays a relatively high degree patchiness on angular scales $\sim10^\circ$. Taking advantage Spectrum Roentgen Gamma eROSITA Final Equatorial Depth Survey (eFEDS), we aim to constrain any variation in soft X-ray surface brightness going sub-degree hundred square degrees. We observe modulations about $60$% several degrees and decreasing for higher energies. The observed is stable over period two...