197 citations · 1.7k across the 73 of their papers we have counts for
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An X-ray-Emitting Proto-Cluster at Reveals Rapid Structure Growth
Akos Bogdan, Gerrit Schellenberger, Qiong Li +1
Galaxy clusters are the most massive gravitationally bound structures in the universe and serve as tracers of the assembly of large-scale structure. Studying their progenitors, pro…
Cosmology and Astrophysics with the Diffuse eRASS1 X-ray Angular Power Spectrum
Erwin T. Lau, Ákos Bogdán, Daisuke Nagai +2
The recent tension in the value of the cosmological parameter , which represents the amplitude of the matter density fluctuations of the universe, ha…
Painting baryons onto N-body simulations of galaxy clusters with image-to-image deep learning
Urmila Chadayammuri, Michelle Ntampaka, John ZuHone +2
Galaxy cluster mass functions are a function of cosmology, but mass is not a direct observable, and systematic errors abound in all its observable proxies. Mass-free inference can…
X-ray Absorption Lines in the Warm-Hot Intergalactic Medium: Probing Chandra observations with the CAMEL simulations
Amanda Butler Contreras, Erwin T. Lau, Benjamin D. Oppenheimer +5
Known as the "Missing Baryon Problem", about one-third of baryons in the local universe remain unaccounted for. The missing baryons are thought to reside in the warm-hot intergalac…
The X-ray Angular Power Spectrum of Extended Sources in the eROSITA Final Equatorial Depth Survey
Erwin T. Lau, Akos Bogdan, Urmila Chadayammuri +3
The eROSITA Final Equatorial Depth Survey (eFEDS), with a sky area of 140 square degrees with depth equivalent to the equatorial patch of the final eROSITA all-sky survey, represen…
The eROSITA view of the Abell 3391/95 field: The Northern Clump. The largest infalling structure in the longest known gas filament observed with eROSITA, XMM-Newton, and Chandra
Angie Veronica, Yuanyuan Su, Veronica Biffi +18
SRG/eROSITA PV observations revealed the A3391/95 cluster system and the Northern Clump (MCXC J0621.7-5242 galaxy cluster) are aligning along a cosmic filament in soft X-rays, simi…
Detection of the Missing Baryons toward the Sightline of H1821+643
Orsolya E. Kovacs, Akos Bogdan, Randall K. Smith +2
Based on constraints from Big Bang nucleosynthesis and the cosmic microwave background, the baryon content of the high-redshift Universe can be precisely determined. However, at lo…
The Double Galaxy Cluster Abell 2465 III. X-ray and Weak-lensing Observations
Gary A. Wegner, Keiichi Umetsu, Sandor M. Molnar +7
We report Chandra X-ray observations and optical weak-lensing measurements from Subaru/Suprime-Cam images of the double galaxy cluster Abell 2465 (z=0.245). The X-ray brightness da…
Binary Black Holes, Gas Sloshing, and Cold Fronts in the X-ray Halo Hosting 4C+37.11
Felipe Andrade-Santos, Akos Bogdan, Roger W. Romani +5
We analyzed deep ACIS-I exposures of the cluster-scale X-ray halo surrounding the radio source 4C+37.11. This remarkable system hosts the closest resolved pair of super-m…
Detection of a luminous hot X-ray corona around the massive spiral galaxy NGC266
Akos Bogdan, William R. Forman, Ralph P. Kraft +1
The presence of luminous hot X-ray coronae in the dark matter halos of massive spiral galaxies is a basic prediction of galaxy formation models. However, observational evidence for…
Hot X-ray coronae around massive spiral galaxies: a unique probe of structure formation models
Akos Bogdan, William R. Forman, Mark Vogelsberger +8
Luminous X-ray gas coronae in the dark matter halos of massive spiral galaxies are a fundamental prediction of structure formation models, yet only a few such coronae have been det…
Exploring the unusually high black hole-to-bulge mass ratios in NGC4342 and NGC4291: the asynchronous growth of bulges and black holes
Akos Bogdan, William R. Forman, Irina Zhuravleva +10
We study two nearby, early-type galaxies, NGC4342 and NGC4291, that host unusually massive black holes relative to their low stellar mass. The observed black hole-to-bulge mass rat…
An upper limit on the contribution of accreting white dwarfs to the type Ia supernova rate
Marat Gilfanov, Akos Bogdan
There is wide agreement that Type Ia supernovae (used as standard candles for cosmology) are associated with the thermonuclear explosions of white dwarf stars. The nuclear runaway…
Soft band X/K luminosity ratios for gas-poor early-type galaxies
Akos Bogdan, Marat Gilfanov
We aim to place upper limits on the combined X-ray emission from the population of steady nuclear-burning white dwarfs in galaxies. In the framework of the single-degenerate scenar…