Narrow-Line Seyfert 1 (NLS1) galaxies exhibit narrow permitted Hβ lines (FWHM < 2000 km/s) and strong Fe II multiplets with low black hole (BH) masses (< $10^8$M⊙) and high Eddington ratios. The BH masses and predominantly disk-like hosts suggest that NLS1s are early-stage Active Galactic Nuclei (AGN). They host the lowest mass super massive BHs that can launch relativistic jets and offer...
AC-coupled Low Gain Avalanche Diodes (AC-LGADs) are a silicon detector technology capable of simultaneous micrometer-scale position resolution and picosecond-level timing, making them attractive for 4D particle tracking in high-energy physics. The spatial performance of AC-LGADs is strongly influenced by lateral charge spreading within the n-type resistive surface layer, yet systematic studies...
With the Large Hadron Collider program drawing toward its conclusion in the mid 2040s, CERN’s proposed Future Circular Collider (FCC) represents the next era of high-energy physics. The IDEA detector concept, proposed for the FCC’s electron-positron stage (FCC-ee), employs dual-readout fiber calorimetry to achieve the precision energy measurements required for this program. Texas Tech’s High...
Narrow-line Seyfert 1 galaxies (NLS1s) are a class of active galactic nuclei (AGN) long believed to be radio-silent and incapable of producing relativistic jets; however, recent studies have shown otherwise. The Fermi Large Area Telescope (LAT) made a groundbreaking discovery by detecting gamma-ray emission from the NLS1 source PMN J0948+0022, providing clear evidence that some of these...
Accretion disks surrounding supermassive black holes cannot be spatially resolved, but studying their X-ray and UV/optical variability over time enables us to probe the accretion disk physics. A major uncertainty, however, is whether multiple physical processes operating on different timescales contribute to the observed variability. To investigate this, we use simultaneous NICER X-ray and...
Strongly coupled hidden sectors predict a family of dark matter particles
which reside in the dark sector. They can be generalized into two broad
groups: stable dark hadrons, which do not interact with baryonic
matter and hence cannot be detected, and unstable dark hadrons,
which decay back to Standard Model particles and therefore can be
reconstructed. Here, we introduce DRAGON...
Controlling the phase and polarization of infrared light is essential for wavefront shaping and polarization conversion, yet achieving such control across the mid- and far-infrared (MIR–FIR) remains challenging: natural anisotropic optical materials are scarce in this range, and lossy plasmon polaritons alone offer limited control at longer infrared wavelengths. Here, we demonstrate infrared...
In this study we looked at eight narrow-line Seyfert 1 (NLS1) galaxies in $J-$ and $Ks-$ bands. The data was gathered with the FourStar instrument of the 6.5 m Magellan Baade telescope at the Las Campanas Observatory (Chile). The purpose of this study is to identify the host galaxy morphologies of each source by using GALFIT. So far, we have modeled four sources using GALFIT and continue...
Abstract
Weyl semimetals require the breaking of either time-reversal symmetry or inversion symmetry (or both). PrAlGe is a noncentrosymmetric material whose crystal structure lacks inversion symmetry and is widely considered to exhibit a ferromagnetic ground state that additionally breaks time-reversal symmetry. This additional breaking of time-reversal symmetry is expected to modify the...
