First X-ray-based statistical tests for clumpy-torus models: eclipse events from 230 years of monitoring of Seyfert AGN
AG Markowitz, M Krumpe…�- Monthly Notices of the�…, 2014 - academic.oup.com
We present an analysis of multitime-scale variability in line-of-sight X-ray-absorbing gas as
a function of optical classification in a large sample of Seyfert active galactic nuclei (AGN) to …
a function of optical classification in a large sample of Seyfert active galactic nuclei (AGN) to …
[HTML][HTML] eROSITA detection of a cloud obscuration event in the Seyfert AGN EC 04570–5206
A Markowitz, M Krumpe, D Homan…�- Astronomy &�…, 2024 - aanda.org
Context. Recent years have seen broad observational support for the presence of a clumpy
component within the circumnuclear gas around supermassive black holes (SMBHs). In the X…
component within the circumnuclear gas around supermassive black holes (SMBHs). In the X…
[HTML][HTML] Deciphering the extreme X-ray variability of the nuclear transient eRASSt J045650. 3− 203750-A likely repeating partial tidal disruption event
… We obtained acceptable fits for X4 with both the M pbb (χ 2 /dof = 145.1/145) and M pdb (χ 2
… lower BH mass (eg M BH = 3 � 10 6 M ⊙ , the mass measured from the relation) is adopted. …
… lower BH mass (eg M BH = 3 � 10 6 M ⊙ , the mass measured from the relation) is adopted. …
The variable and non-variable x-ray absorbers in compton-thin type ii active galactic nuclei
S Laha, AG Markowitz, M Krumpe…�- The Astrophysical�…, 2020 - iopscience.iop.org
We have conducted an extensive X-ray spectral variability study of a sample of 20 Compton-thin
type II galaxies using broadband spectra from XMM-Newton, Chandra, and Suzaku. The …
type II galaxies using broadband spectra from XMM-Newton, Chandra, and Suzaku. The …
Chandra survey in the AKARI North Ecliptic Pole Deep Field – I. X-ray data, point-like source catalogue, sensitivity maps, and number counts
…, T Ishigaki, T Takagi, AG Markowitz…�- Monthly Notices of�…, 2015 - academic.oup.com
We present data products from the 300 ks Chandra survey in the AKARI North Ecliptic Pole
Deep Field. This field has a unique set of nine-band infrared photometry covering 2–24 μm …
Deep Field. This field has a unique set of nine-band infrared photometry covering 2–24 μm …
[HTML][HTML] A variable-density absorption event in NGC 3227 mapped with Suzaku and Swift
T Beuchert, AG Markowitz, F Krau�, G Miniutti…�- Astronomy &�…, 2015 - aanda.org
… We thank Mirko Krumpe and Robert Nikutta for reading the manuscript and giving very
helpful comments. We made use of ISIS functions provided by ECAP/Remeis observatory and …
helpful comments. We made use of ISIS functions provided by ECAP/Remeis observatory and …
A Transient “Changing-look” Active Galactic Nucleus Resolved on Month Timescales from First-year Sloan Digital Sky Survey V Data
…, D Homan, AM Koekemoer, M Krumpe…�- The Astrophysical�…, 2022 - iopscience.iop.org
We report the discovery of a new" changing-look" active galactic nucleus (CLAGN) event, in
the quasar SDSS J162829. 17+ 432948.5 at z= 0.2603, identified through repeat …
the quasar SDSS J162829. 17+ 432948.5 at z= 0.2603, identified through repeat …
Discovery of the luminous X-ray ignition eRASSt J234402. 9− 352640-I. Tidal disruption event or a rapid increase in accretion in an active galactic nucleus?
D Homan, M Krumpe, A Markowitz, T Saha…�- Astronomy &�…, 2023 - aanda.org
… are detected as separate objects, and we find m K = 14.38 for J234402 (observed in 1998). …
luminosity and therefore on M BH . Using the 2MASS value, we find M BH < 10 8.3 M ⊙ . In a …
luminosity and therefore on M BH . Using the 2MASS value, we find M BH < 10 8.3 M ⊙ . In a …
Inferring the morphology of AGN torus using X-ray spectra: a reliability study
T Saha, AG Markowitz, J Buchner�- Monthly Notices of the Royal�…, 2022 - academic.oup.com
Numerous X-ray spectral models have been developed to model emission reprocessed by
the torus of an active galactic nucleus (AGN), eg UXCLUMPY, CTORUS, and MYTORUS. …
the torus of an active galactic nucleus (AGN), eg UXCLUMPY, CTORUS, and MYTORUS. …
Multi-wavelength study of an X-ray flaring event and a variable soft X-ray excess in Seyfert galaxy detected with eROSITA
S Krishnan, AG Markowitz, M Krumpe…�- 42nd meeting of the�…, 2024 - ui.adsabs.harvard.edu
Active Galactic Nuclei (AGN) are powered by accretion of gas onto supermassive black
holes. There are open questions regarding how the X-ray corona, disk, and BLR evolve in …
holes. There are open questions regarding how the X-ray corona, disk, and BLR evolve in …