8 papers
Radiative filtering unifies broad-line phenomenology in active galactic nuclei
Mohammad Hassan Naddaf
Broad emission lines (BELs) are a defining feature of active galactic nuclei (AGNs), yet they weaken or disappear in both very low- and very high-accretion systems. These regimes a…
Radiation-pressure instability is an artifact of constant- closure. Implications for AGN disk tensions
M. H. Naddaf, M. Ghasemnezhad, H. Ghanbarnejad +2
The standard -disk formalism parametrizes turbulent angular momentum transport through a dimensionless coefficient , assumed to be spatially and thermodynamically invariant…
HALO II: Constraining Hubble constant through continuum delay fitting of Fairall 9
Amit Kumar Mandal, Francisco Pozo Nuñez, Vikram Kumar Jaiswal +28
The Hubble tension remains one of the most significant unresolved problems in modern cosmology. A key question is whether it may arise from underestimated systematic uncertainties…
HALO I: Photometric continuum reverberation mapping of Fairall 9
Amit Kumar Mandal, Francisco Pozo Nuñez, Vikram Kumar Jaiswal +23
We investigate the origin of inter-band continuum time delays in active galactic nuclei (AGNs) to study the structure and properties of their accretion disks. We aim to measure the…
Quasar Main Sequence unfolded by 2.5D FRADO (Natural expression of Eddington ratio, black hole mass, and inclination)
M. H. Naddaf, M. L. MartÃnez-Aldama, P. Marziani +2
The quasar main sequence (QMS), characterized by the Eigenvector 1 (EV1), serves as a unifying framework for classifying type-1 active galactic nuclei (AGNs) based on their diverse…
H line shape and radius-luminosity relation in 2.5D FRADO
M. H. Naddaf, M. L. Martinez-Aldama, D. Hutsemekers +2
Galaxies with active galactic nuclei (AGN) exhibit broad emission lines as a key spectral feature. The shape of emission-line profiles depends on the complex dynamics of discrete c…