Athena Engholm

ORCID: 0000-0001-6970-7782
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About
Contact & Profiles
Research Areas
  • Galaxies: Formation, Evolution, Phenomena
  • Cosmology and Gravitation Theories
  • Adaptive optics and wavefront sensing
  • Radio Astronomy Observations and Technology
  • Black Holes and Theoretical Physics
  • Pulsars and Gravitational Waves Research
  • Astronomy and Astrophysical Research
  • Computational Physics and Python Applications
  • Astrophysical Phenomena and Observations

University of Hawaiʻi at Mānoa
2023-2024

University of Hawaii System
2024

Abstract Coupling of black hole mass to the cosmic expansion has been suggested as a possible path understanding dark energy content Universe. We test this hypothesis by comparing supermassive (SMBH) density at z = 0 total accreted in active galactic nuclei (AGN) since 6, constrain how much SMBH can arise from cosmologically coupled growth, opposed growth accretion. Using an estimate local ≈1.0 × 10 6 M ⊙ Mpc −1 , radiative accretion efficiency, η range 0.05 < 0.3, and observed AGN...

10.3847/2041-8213/ad1b5f article EN cc-by The Astrophysical Journal Letters 2024-01-24

The assembly of supermassive black hole (SMBH) mass ($M_{\bullet}$) and stellar ($M_{*}$) in galaxies can be studied via the redshift evolution $M_{\bullet}-M_{*}$ relation, but ways which selection bias physical channels affect this are uncertain. To address this, we compare relation for local massive ($M_{*}>10^{10.5}$M$_{\odot}$) quiescent early-type (ETGs) to that ETGs hosting active galactic nuclei (AGN) at $z\sim0.8$. restrictions on galaxy type limit may connect two relations. For...

10.48550/arxiv.2501.17227 preprint EN arXiv (Cornell University) 2025-01-28

Abstract The assembly of supermassive black hole (SMBH) mass ( M • ) and stellar * in galaxies can be studied via the redshift evolution – relation, but ways which selection bias physical channels affect this are uncertain. To address this, we compare relation for local massive &gt; 10 10.5 ⊙ quiescent early-type (ETGs) to that ETGs hosting active galactic nuclei (AGN) at z ∼ 0.8. restrictions on galaxy type limit may connect two relations. For sample find <mml:math...

10.3847/1538-4357/adb0c7 article EN cc-by The Astrophysical Journal 2025-02-27

Coupling of black hole mass to the cosmic expansion has been suggested as a possible path understanding dark energy content Universe. We test this hypothesis by comparing supermassive (SMBH) density at $z=0$ total accreted in AGN since $z=6$, constrain how much SMBH can arise from cosmologically-coupled growth, opposed growth accretion. Using an estimate local $\approx 1.0\times10^{6}\,$M$_{\odot}\,$Mpc$^{-1}$, radiative accretion efficiency, $\eta$: $0.05<\eta<0.3$, and observed luminosity...

10.48550/arxiv.2312.12344 preprint EN cc-by arXiv (Cornell University) 2023-01-01
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