197 citations · 1.7k across the 73 of their papers we have counts for
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The Evolution of the ACIS Contamination Layer on the Chandra X-ray Observatory from 2010 to 2026
Paul P. Plucinsky, Peter W. Ratzlaff, Akos Bogdan +1
The Chandra X-ray Observatory (CXO) was launched over 27 years ago and has been delivering spectacular science over the course of its mission. The Advanced CCD Imaging Spectrometer…
25 Years of Groundbreaking Discoveries with Chandra
Patrick Slane, Ákos Bogdán, David Pooley
The Chandra X-ray Observatory is a mainstay of modern observational astrophysics. With the highest angular resolution of any X-ray facility, its imaging and spectral capabilities i…
Active Galaxy Science with the Line Emission Mapper: The Case for High-Resolution Soft X-ray Spectroscopy
Kimberly A. Weaver, Jenna M. Cann, Ryan W. Pfeifle +11
This white paper discusses the breadth of science related to active galactic nuclei (AGN) and associated phenomena to be enabled by a mission with microcalorimeter energy resolutio…
X-Ray Bright Active Galactic Nuclei in Local Dwarf Galaxies: Insights from eROSITA
Andrea Sacchi, Akos Bogdan, Urmila Chadayammuri +1
Although supermassive black holes (SMBHs) reside in the heart of virtually every massive galaxy, it remains debated whether dwarf galaxies commonly host SMBHs. Because low-mass gal…
Mapping the Intracluster Medium in the Era of High-resolution X-ray Spectroscopy
Congyao Zhang, Irina Zhuravleva, Maxim Markevitch +24
High-resolution spectroscopy in soft X-rays will open a new window to map multiphase gas in galaxy clusters and probe physics of the intracluster medium (ICM), including chemical e…
Probing extreme black-hole outflows on short timescales via high spectral-resolution X-ray imagers
Ciro Pinto, James F. Steiner, Arash Bodaghee +7
We investigate outflows and the physics of super-Eddington versus sub-Eddington regimes in black hole systems. Our focus is on prospective science using next-generation high-resolu…
First Detection of an Over-Massive Black Hole Galaxy UHZ1: Evidence for Heavy Black Hole Seed Formation from Direct Collapse
Priyamvada Natarajan, Fabio Pacucci, Angelo Ricarte +3
The recent Chandra-JWST discovery of a quasar in the z = 10.1 galaxy UHZ1 reveals that accreting supermassive black holes (SMBHs) were already in place 470 million years after the…
Deep Chandra observations of X-ray point sources in M87
Luan Luan, Christine Jones, William R. Forman +6
We present a study of X-ray source populations in M87, the cD galaxy of the Virgo cluster, using 12 archival {\it Chandra} observations with a total exposure of 680 ks spanni…
Probing the hot X-ray gas in the narrow-line region of Mrk 3
Akos Bogdan, Ralph P. Kraft, Daniel A. Evans +2
We study the prototypical Seyfert 2 galaxy, Markarian 3, based on imaging and high-resolution spectroscopy observations taken by the Chandra X-ray Observatory. We construct a decon…
A Spectacular Bow Shock in the 11 keV Galaxy Cluster Around 3C 438
Deanna L. Emery, Akos Bogdan, Ralph P. Kraft +4
We present results of deep 153 ks Chandra observations of the hot, 11 keV, galaxy cluster associated with the radio galaxy 3C 438. By mapping the morphology of the hot gas and anal…
LMXB populations in galaxy outskirts: globular clusters and supernova kicks
Zhongli Zhang, Marat Gilfanov, Akos Bogdan
For the first time, we have systematically explored the population of discrete X-ray sources in the outskirts of early-type galaxies. Based on a broad sample of 20 galaxies observe…
The diverse hot gas content and dynamics of optically similar low-mass elliptical galaxies
Akos Bogdan, Laurence P. David, Christine Jones +2
The presence of hot X-ray emitting gas is ubiquitous in massive early-type galaxies. However, much less is known about the content and physical status of the hot X-ray gas in low-m…
Chandra observations of NGC4342, an optically faint, X-ray gas-rich early-type galaxy
Akos Bogdan, William R. Forman, Ralph P. Kraft +10
Chandra X-ray observations of NGC4342, a low stellar mass (M_K=-22.79 mag) early-type galaxy, show luminous, diffuse X-ray emission originating from hot gas with temperature of kT~…
Unresolved and diffuse components of X-ray emission and X/K luminosity ratios in nearby early-type and late-type galaxies
Akos Bogdan, Marat Gilfanov
We explore the nature of unresolved X-ray emission in a broad sample of galaxies of all morphological types based on archival Chandra data. After removing bright compact sources, w…
Chandra and ROSAT observations of Abell 194: detection of an X-ray cavity and mapping the dynamics of the cluster
Akos Bogdan, Ralph P. Kraft, William R. Forman +6
Based on Chandra and ROSAT observations, we investigated the nearby poor cluster Abell 194, which hosts two luminous radio galaxies, NGC547 (3C 40B) and NGC541 (3C 40A). We demonst…
Progenitors of type Ia supernovae in elliptical galaxies
Marat Gilfanov, Akos Bogdan
Although there is a nearly universal agreement that type Ia supernovae are associated with the thermonuclear disruption of a CO white dwarf, the exact nature of their progenitors i…