Dev R. Sadaula
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View article: The Response of Warm Absorbers to the Variations in the Ionizing Continuum in the Active Galaxy NGC 4051
The Response of Warm Absorbers to the Variations in the Ionizing Continuum in the Active Galaxy NGC 4051 Open
We present a time-resolved X-ray spectral analysis of the warm absorbers in the Seyfert galaxy NGC 4051, which has an active galactic nucleus (AGN), using observations from the Neutron Star Interior Composition Explorer (NICER). Despite NI…
View article: The response of warm absorbers to the variations in the ionizing continuum in the active galaxy NGC 4051
The response of warm absorbers to the variations in the ionizing continuum in the active galaxy NGC 4051 Open
We present a time-resolved X-ray spectral analysis of the warm absorbers in the Seyfert galaxy NGC 4051, which has an active galactic nucleus (AGN), using observations from the Neutron Star Interior Composition Explorer (NICER). Despite NI…
View article: Multiwavelength Observations of a Jet Launch in Real Time from the Post-changing-look Active Galaxy 1ES 1927+654
Multiwavelength Observations of a Jet Launch in Real Time from the Post-changing-look Active Galaxy 1ES 1927+654 Open
We present results from a high-cadence multiwavelength observational campaign of the enigmatic changing-look active galactic nucleus 1ES 1927+654 from 2022 May to 2024 April, coincident with an unprecedented radio flare (an increase in flu…
View article: Millihertz oscillations near the innermost orbit of a supermassive black hole
Millihertz oscillations near the innermost orbit of a supermassive black hole Open
View article: Multi-wavelength observations of a jet launch in real time from the post-changing-look Active Galaxy 1ES 1927+654
Multi-wavelength observations of a jet launch in real time from the post-changing-look Active Galaxy 1ES 1927+654 Open
We present results from a high cadence multi-wavelength observational campaign of the enigmatic changing look AGN 1ES 1927+654 from May 2022- April 2024, coincident with an unprecedented radio flare (an increase in flux by a factor of $\si…
View article: Millihertz Oscillations Near the Innermost Orbit of a Supermassive Black Hole
Millihertz Oscillations Near the Innermost Orbit of a Supermassive Black Hole Open
Recent discoveries from time-domain surveys are defying our expectations for how matter accretes onto supermassive black holes (SMBHs). The increased rate of short-timescale, repetitive events around SMBHs, including the newly-discovered q…
View article: Late-time Radio Brightening and Emergence of a Radio Jet in the Changing-look AGN 1ES 1927+654
Late-time Radio Brightening and Emergence of a Radio Jet in the Changing-look AGN 1ES 1927+654 Open
We present multifrequency (5–345 GHz) and multiresolution radio observations of 1ES 1927+654, widely considered one of the most unusual and extreme changing-look active galactic nuclei (CL-AGNs). The source was first designated a CL-AGN af…
View article: Late-time radio brightening and emergence of a radio jet in the changing-look AGN 1ES 1927+654
Late-time radio brightening and emergence of a radio jet in the changing-look AGN 1ES 1927+654 Open
We present multi-frequency (5-345 GHz) and multi-resolution radio observations of 1ES 1927+654, widely considered one of the most unusual and extreme changing-look active galactic nuclei (CL-AGN). The source was first designated a CL-AGN a…
View article: Time-dependent Photoionization Modeling of Warm Absorbers: High-resolution Spectra and Response to Flaring Light Curves
Time-dependent Photoionization Modeling of Warm Absorbers: High-resolution Spectra and Response to Flaring Light Curves Open
Time-dependent photoionization modeling of warm absorber (WA) outflows in active galactic nuclei can play an important role in understanding the interaction between WAs and the central black hole. The WA may be out of the equilibrium state…
View article: Time Dependent Photoionization Modeling of Warm Absorbers: High-Resolution Spectra and Response to Flaring Light Curves
Time Dependent Photoionization Modeling of Warm Absorbers: High-Resolution Spectra and Response to Flaring Light Curves Open
Time dependent photoionization modeling of warm absorber outflows in active galactic nuclei can play an important role in understanding the interaction between warm absorbers and the central black hole. The warm absorber may be out of the …
View article: Time-dependent Photoionization Modeling of Warm Absorbers in Active Galactic Nuclei
Time-dependent Photoionization Modeling of Warm Absorbers in Active Galactic Nuclei Open
Warm absorber spectra contain bound-bound and bound-free absorption features seen in the X-ray and UV spectra from many active galactic nuclei. The widths and centroid energies of these features indicate they occur in outflowing gas, and t…
View article: Time Dependent Photoionization Modeling of Warm Absorbers in Active Galactic Nuclei
Time Dependent Photoionization Modeling of Warm Absorbers in Active Galactic Nuclei Open
Warm absorber spectra contain bound-bound and bound-free absorption features seen in the X-ray and UV spectra from many active galactic nuclei (AGN). The widths and centroid energies of these features indicate they occur in outflowing gas,…