Search Publications
Imaging the innermost circumstellar environment of the red supergiant WOH G64 in the Large Magellanic Cloud
van Loon, J. Th.; Weigelt, G.; Hofmann, K. -H. +3 more
Context. Significant mass loss in the red supergiant (RSG) phase has great influence on the evolution of massive stars and their final fate as supernovae. Aims. We present near-infrared interferometric imaging of the circumstellar environment of the dust-enshrouded RSG WOH G64 in the Large Magellanic Cloud. Methods. WOH G64 was observed with the G…
Zero-age horizontal branch models for -2.5 ≤ [Fe/H] ≤-0.5 and their implications for the apparent distance moduli of globular clusters
VandenBerg, Don A.
Grids of zero-age horizontal branch (ZAHB) models are presented, along with a suitable interpolation code, for -2.5 ≤ [Fe/H] ≤ -0.5, in steps of 0.2 dex, assuming Y = 0.25 and 0.29, [O/Fe] = +0.4 and +0.6, and [m/Fe] = +0.4 for all of the other α-elements. The HB populations of 37 globular clusters (GCs) are fitted to these ZAHBs to derive their a…
Proper motion of the radio jets in two blazars at redshift above 3
Paragi, Zsolt; Krezinger, Máté; Frey, Sándor +7 more
There is still a limited number of high-redshift (z > 3) active galactic nuclei (AGNs) whose jet kinematics have been studied with very long baseline interferometry (VLBI). Without a dedicated proper motion survey, regularly conducted astrometric VLBI observations of bright radio-emitting AGN with sensitive arrays can be utilized to follow chan…
Detection of open cluster members inside and beyond tidal radius by machine learning methods based on Gaia DR3
Noormohammadi, M.; Khakian Ghomi, M.; Javadi, A.
In our previous work, we introduced a method that combines two unsupervised algorithms: Density-based spatial clustering of applications with noise (DBSCAN) and Gaussian mixture model (GMM). We applied this method to 12 open clusters based on Gaia Early Data Release 3 (EDR3) data, demonstrating its effectiveness in identifying reliable cluster mem…
Multiwavelength and Multimessenger Counterparts of Fast Radio Bursts
Zhang, Bing
Fast radio bursts (FRBs) are brief, highly dispersed bursts detected in the radio band that originate from cosmological distances. The only such event detected in the Milky Way Galaxy, FRB 20200428D—which was associated with an X-ray burst emitted by a magnetar named SGR J1935+2154—revealed the first case of a multiwavelength counterpart of an FRB…
Host Galaxy and Nuclear Properties of IR-selected AGNs with and without Outflow Signatures
Li, Zi-Jian; Dai, Y. Sophia; Oio, Gabriel A. +1 more
Active galactic nucleus (AGN) driven outflows can have a significant impact on the evolution of the host galaxy. In this work, we compare the properties of galaxies that host AGNs with and without outflows. Our sample consists of 103 AGNs identified by mid-IR color–color selection and confirmed with optical spectroscopy at a redshift range of 0.3 …
First Direct Imaging of a Kelvin–Helmholtz Instability by PSP/WISPR
Vourlidas, Angelos; Stenborg, Guillermo; Howard, Russell A. +3 more
We present a comprehensive analysis aimed at proving the hypothesis that a train of small-scale features observed by the Wide-field Imager (WISPR) onboard the Parker Solar Probe (PSP) are the signature of a Kelvin–Helmholtz instability (KHI). These features were seen near the flank of a Coronal Mass Ejection (CME) wake between 7.5 R ⊙ a…
Polyphase tectonics on Mars: Insight from the Claritas Fossae
Tosi, Silvano; Balbi, Evandro; Ferretti, Gabriele +2 more
The Claritas Fossae (CF) is an elongated system of scarps and depressions >900 km long, representing the western boundary of the Thaumasia Region to the south of the Tharsis volcanic province. Although there is general agreement on the tectonic nature of such major physiographic feature, the processes that led to its formation are still debated…
The high-energy environment of the heavy sub-Earth GJ 367 b indicates likely complete evaporation of its atmosphere
Schmitt, J. H. M. M.; Robrade, J.; Schneider, P. C. +5 more
The planet GJ 367 b is a recently discovered high-density sub-Earth orbiting an M dwarf star. Its composition was modelled to be predominantly iron with a potential remainder of a hydrogen-helium envelope. Here we report an X-ray detection of this planet's host star for the first time, using data from the spectro-imaging X-ray telescope eROSITA on…
The HST Large Programme on ω Centauri. VI. The radial gradient of the stellar populations
Vesperini, E.; Scalco, M.; Bedin, L.
In this paper we present the analysis of Hubble Space Telescope (HST) observations of the globular cluster Omega Centauri. Our analysis combines data obtained in this work with previously published HST data from an earlier article of this series and encompasses a broad portion of the cluster's radial extension. Our findings reveal a significant ra…