Browsing by Subject "Astrophysics"
Now showing items 1-18 of 18
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2025-10-09Article
A Deep Dive into the NGC 741 Galaxy Group: Insights into a Spectacular Head-tail Radio Galaxy from VLA, MeerKAT, uGMRT, and LOFAR
(IOP Publishing, 01-01-2024)We present deep, wideband multifrequency radio observations (144 MHz−8 GHz) of the remarkable galaxy group NGC 741, which yield crucial insights into the interaction between the infalling head-tail radio galaxy (NGC 742) ... -
2025-10-08Article
A Nonparametric Reconstruction of the Hubble Parameter H(z) Based on Radial Basis Function Neural Networks
(IOP Publishing, 01-01-2024)Accurately measuring the Hubble parameter is vital for understanding the expansion history and properties of the Universe. In this paper, we propose a new method that supplements the covariance between redshift pairs to ... -
2025-10-08Article
A Novel Model for the MeV Emission Line in GRB 221009A
(IOP Publishing, 01-01-2024)Gamma-ray bursts (GRBs) have long been considered potential sources of ultrahigh-energy cosmic rays (UHECRs; with energy ≳10 ^18 eV). In this work, we propose a novel model generating MeV emission lines in GRBs, which can ... -
2025-10-08Article
A Protocluster of Massive Quiescent Galaxies at z = 4
(IOP Publishing, 01-01-2024)We report on discovery of a concentration of massive quiescent galaxies located at z = 4. The concentration is first identified using high-quality photometric redshifts based on deep, multiband data in Subaru/XMM-Newton ... -
2025-10-08Article
Accuracy Analysis for Shack–Hartmann Wave Front Sensing with Extended Sources
(IOP Publishing, 01-01-2024)Correlating the Shack–Hartmann wave front sensor (SH-WFS) with extended targets is widely used in solar adaptive optics systems. This paper aims to introduce a theoretical analysis that evaluates the accuracy of the SH-WFS ... -
2025-10-02Article
Asteroseismology of Triple-mode Radial δ Scuti Star: TIC 400562821
(IOP Publishing, 01-01-2024)We investigated the pulsating behavior of TIC 400562821 using high-precision observations from TESS. Fourier analysis of time-series data revealed three independent frequencies. The period ratios of F to F1 (0.774) and F ... -
2025-10-02Article
Constraints on Interacting Dark Energy Models from the DESI Baryon Acoustic Oscillation and DES Supernovae Data
(IOP Publishing, 01-01-2024)The recent results from the first-year baryon acoustic oscillations (BAO) data released by the Dark Energy Spectroscopic Instrument (DESI), combined with cosmic microwave background (CMB) and Type Ia supernova (SN) data, ... -
2025-10-08Article
Discovery of a Shock-compressed Magnetic Field in the Northwestern Rim of the Young Supernova Remnant RX J1713.7–3946 with X-Ray Polarimetry
(IOP Publishing, 01-01-2024)Supernova remnants (SNRs) provide insights into cosmic-ray acceleration and magnetic field dynamics at shock fronts. Recent X-ray polarimetric measurements by the Imaging X-ray Polarimetry Explorer (IXPE) have revealed ... -
2025-10-08Article
Disentangling the Black Hole Mass Spectrum with Photometric Microlensing Surveys
(IOP Publishing, 01-01-2024)From the formation mechanisms of stars and compact objects to nuclear physics, modern astronomy frequently leverages surveys to understand populations of objects to answer fundamental questions. The population of dark and ... -
2025-10-08Article
Efficient NIRCam Selection of Quiescent Galaxies at 3 < z < 6 in CEERS
(IOP Publishing, 01-01-2024)Substantial populations of massive quiescent galaxies at z ≥ 3 challenge our understanding of rapid galaxy growth and quenching over short timescales. In order to piece together this evolutionary puzzle, more statistical ... -
2025-10-02Article
Evidence of Extreme Ionization Conditions and Low Metallicity in GHZ2/GLASS-Z12 from a Combined Analysis of NIRSpec and MIRI Observations
(IOP Publishing, 01-01-2024)GHZ2/GLASS-z12, one of the most distant galaxies found in JWST observations, has been recently observed with both the NIRSpec and MIRI spectrographs, establishing a spectroscopic redshift z _spec = 12.34 and making it the ... -
2025-10-08Article
Experimental observation of violent relaxation
(Nature Portfolio, 01-06-2024)Abstract Structures in the Universe, ranging from globular clusters to entire galaxies, are not described by standard statistical mechanics at equilibrium. Instead, they are formed through a process of a very different ... -
2025-10-09Article
Identifying the Origin of Fast Radio Burst–Associated X-Ray Bursts with X-Ray Polarization
(IOP Publishing, 01-01-2024)The origin of an extraordinary X-ray burst (XRB) associated with a fast radio burst (FRB) such as FRB 20200428 is still unclear, though several models, such as the emission of a trapped fireball modified by resonant cyclotron ... -
2025-10-02Article
Long-term Simultaneous Monitoring Observations of SiO and H2O Masers toward the Mira Variable WX Serpentis
(IOP Publishing, 01-01-2024)We present the results from long-term simultaneous monitoring observations of SiO and H _2 O masers toward the Mira variable star WX Serpentis. This study has been conducted with 21 m single-dish radio telescopes of the ... -
2025-10-09Article
Origin and Full Characterization of the Secondary (Assembly) Halo Bias
(IOP Publishing, 01-01-2024)The clustering of dark matter halos depends not only on their mass, the so-called primary bias, but also on their internal properties, the so-called secondary bias. While the former effect is well understood within the ... -
2025-10-08Article
Rapid Generation of Kilonova Light Curves Using Conditional Variational Autoencoder
(IOP Publishing, 01-01-2024)The discovery of the optical counterpart, along with the gravitational waves (GWs) from GW170817, of the first binary neutron star merger has opened up a new era for multimessenger astrophysics. Combining the GW data with ... -
2025-10-08Article
The ALMA-QUARKS Survey: Detection of Two Extremely Dense Substructures in a Massive Prestellar Core
(IOP Publishing, 01-01-2024)Only a handful of massive starless core candidates have been discovered so far, but none of them have been fully confirmed. Within the MM1 clump in the filamentary infrared dark cloud G34.43+0.24 that was covered by the ... -
2025-10-09Article
The Detection of Possible Quasiperiodic Oscillations in the BL Lac 4FGL J2139.4−4235
(IOP Publishing, 01-01-2024)We present periodicity search analyses on the long-term γ -ray light curve of the BL Lacertae object 4FGL J2139.4−4235 observed by the Fermi Large Area Telescope, over a period of more than 15 yr, from 2008 August 4 to ...