112 citations · 331 across the 16 of their papers we have counts for
10 papers · 1 filter
X-ray properties of massive compact relic galaxies
Orsolya E. Kovacs, Norbert Werner, Akos Bogdan +1
We present the X-ray analysis of seven local compact elliptical galaxies (cEGs), selected for their morphological resemblance to high-redshift red nuggets. As likely descendants of…
A candidate supermassive black hole in a gravitationally-lensed galaxy at
Orsolya E. Kovacs, Akos Bogdan, Priyamvada Natarajan +8
While supermassive black holes (BHs) are widely observed in the nearby and distant universe, their origin remains debated with two viable formation scenarios with light and heavy s…
Circumgalactic Medium on the Largest Scales: Detecting X-ray Absorption Lines with Large-Area Microcalorimeters
Akos Bogdan, Ildar Khabibullin, Orsolya Kovacs +22
The circumgalactic medium (CGM) plays a crucial role in galaxy evolution as it fuels star formation, retains metals ejected from the galaxies, and hosts gas flows in and out of gal…
Evidence for heavy seed origin of early supermassive black holes from a z~10 X-ray quasar
Akos Bogdan, Andy Goulding, Priyamvada Natarajan +9
Observations of quasars reveal that many supermassive black holes (BHs) were in place less than 700 million years after the Big Bang. However, the origin of the first BHs remains a…
Detection of a Superluminous Spiral Galaxy in the Heart of a Massive Galaxy Cluster
Akos Bogdan, Lorenzo Lovisari, Patrick Ogle +5
It is well established that brightest cluster galaxies (BCGs), residing in the center of galaxy clusters, are typically massive and quenched galaxies with cD or elliptical morpholo…
Exploring Gravitationally-Lensed X-ray AGN Behind the RELICS clusters
Akos Bogdan, Orsolya E. Kovacs, Christine Jones +5
Although observations of high-redshift quasars demonstrate that many supermassive black holes (BHs) reached large masses within one billion years after the Big Bang, the origin of…
Ultra-diffuse galaxies in the Coma cluster: Probing their origin and AGN occupation fraction
Orsolya E. Kovacs, Akos Bogdan, Rebecca E. A. Canning
Ultra-diffuse galaxies (UDGs) exhibit low surface brightness, but their optical extent is comparable to Milky Way-type galaxies. Due to their peculiar properties, it remains ambigu…
Constraining the dark matter halo mass of isolated low-surface-brightness galaxies
Orsolya E. Kovacs, Akos Bogdan, Rebecca E. A. Canning
Recent advancements in the imaging of low-surface-brightness objects revealed numerous ultra-diffuse galaxies in the local Universe. These peculiar objects are unusually extended a…
Expanding the Sample: The Relationship Between the Black Hole Mass of BCGs and the Total Mass of Galaxy Clusters
Frederika Phipps, Akos Bogdan, Lorenzo Lovisari +3
Supermassive Black Holes (BHs) residing in brightest cluster galaxies (BCGs) are overly massive when considering the local relationships between the BH mass and stellar bulge mass…
Detection of a Star Forming Galaxy in the Center of a Low-Mass Galaxy Cluster
Akos Bogdan, Lorenzo Lovisari, Orsolya E. Kovacs +4
Brightest Cluster Galaxies (BCGs) residing in the centers of galaxy clusters are typically quenched giant ellipticals. A recent study hinted that star-forming galaxies with large d…