3 papers
astro-ph.GA2025
Brightness and colour variability in NLSy1s
Madhu Sudan, Hum Chand, Paul J. Wiita +1
The Zwicky Transient Facility (ZTF), with its extensive optical monitoring capabilities, has provided an unprecedented opportunity to study the long-term variability of active gala…
astro-ph.GA2025
On the incidence of weak and strong Mg II absorbers towards the Flat and Steep Spectrum Radio quasars
Ritish Kumar, Sapna Mishra, Hum Chand
The incidence rate of Mg II absorbers per unit redshift path (dN/dz) towards quasar sightlines has been used to probe the interaction between quasar jets and surrounding gas clouds…
astro-ph.GA2025
Weak-emission-line quasars: A new clue from their optical variability
Ritish Kumar, Gopal-Krishna, Hum Chand +1
Weak-emission-line QSOs (WLQs) are an enigmatic subclass of the QSO population, as their optical/UV spectra are marked by abnormally weak (or absent) emission lines. To obtain much…