In-Drift Microbial Communities

Jolley, Darren M.

doi:10.2172/837093

Cited by 3 publications

(2 citation statements)

References 20 publications

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“…Applications of this model to other more suitable LLAGN may thus provide better model constraints. So far, we have applied the model to M87 (Jolley & Kuncic 2007) and have found remarkably good agreement between the predicted and observed optical spectra, as well as the predicted jet power and that inferred from jet observations on kiloparsec scales. Furthermore, the model suggests that M87 may harbour a rapidly spinning black hole accreting at a rate of 10 −3 M ⊙ yr −1 .…”

Section: Discussionmentioning

confidence: 56%

“…Unlike the jet-RIAF model for Sgr A ⋆ (Falcke & Markoff 2000;Yuan, Markoff & Falcke 2002) and the disk-corona model for LLAGN (Merloni & Fabian 2002), we explicitly model the magnetic coupling between the accretion flow and the outflow. This model has been successfully applied to M87 (Jolley & Kuncic 2007). The organization of this paper is as follows.…”

Section: Introductionmentioning

confidence: 99%

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Constraints on Jet‐driven Disk Accretion in Sagittarius A*

Jolley

Kuncic

2008

ApJ

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We revisit theoretical and observational constraints on geometrically-thin disk accretion in Sagittarius A ⋆ (Sgr A ⋆ ). We show that the combined effects of mass outflows and electron energization in the hot part of the accretion flow can deflate the inflowing gas from a geometrically-thick structure. This allows the gas to cool and even thermalize on an inflow timescale. As a result, a compact, relatively cool disk may form at small radii. We show that magnetic coupling between the relativistic disk and a steady-state jet results in a disk that is less luminous than a standard relativistic disk accreting at the same rate. This relaxes the observational constraints on thin-disk accretion in Sgr A ⋆ (and by implication, other Low-Luminosity Active Galactic Nulcei, LLAGN). We find typical cold gas accretion rates of a few × 10 −9 M ⊙ yr −1 . We also find that the predicted modified disk emission is compatible with existing near-infrared (NIR) observations of Sgr A ⋆ in its quiescent state provided that the disk inclination angle is > ∼ 87 • and that the jet extracts more than 75% of the accretion power.

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Section: Discussionmentioning

confidence: 56%

Section: Introductionmentioning

confidence: 99%

Constraints on Jet‐driven Disk Accretion in Sagittarius A*

Jolley

Kuncic

2008

ApJ

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Microbial Impacts to the Near-Field Environment Geochemistry: a model for estimating microbial communities in repository drifts at Yucca Mountain

Jolley

Ehrhorn²,

Horn

2003

Journal of Contaminant Hydrology

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Radionuclide Uptake and Transport on Microbes in Potential Repository Drifts at Yucca Mountain, Nevada

Jolley

2002

MRS Proc.

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Radionuclide adsorption onto microbes, microbial retention in the engineered barrier system (EBS), and their potential release from the EBS as microbial colloids have been investigated. The microbial source term for these calculations was derived using MING V 1.0 software code [1]. Multiple model calculations from MING representing variations in possible microbial communities in the EBS were abstracted into two equations representing one meter segments of potential repository drift containing either commercial spent nuclear fuel (CSNF) or defense high level waste (HLW) packages. These two equations (Equations 1 and 2) represent the average cumulative microbial biomass generated in the EBS at any given time. A distribution for uranium uptake onto microbes (162.88 ± 133.05 mg U/gm dry cell) was applied to the microbial source term. The distribution was derived from the data set in Suzuki and Banfield [2] representing 45 different species of bacteria and fungus, covering uranium uptake at optimum pH values of 1 to 7. The mass of uranium sorbed onto the biomass was either sequestered in the EBS or transported as a microbial colloid based on a regression of data from Jewett et al. [3] representing microbial sorption onto air-water interfaces in unsaturated column experiments. Over one million years, it is estimated that EBS microbes may adsorb from 77 to 2302 kg of uranium [2302 kg U > 100% of the uranium available in a one meter segment of a CSNF waste package] per meter of waste package depending on the saturation of the invert and type of waste package. Over the same time, microbial colloids may transport from 8 to 1250 kg of adsorbed uranium per meter of waste package from the EBS.

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In-Drift Microbial Communities

Cited by 3 publications

References 20 publications

Constraints on Jet‐driven Disk Accretion in Sagittarius A*

Constraints on Jet‐driven Disk Accretion in Sagittarius A*

Microbial Impacts to the Near-Field Environment Geochemistry: a model for estimating microbial communities in repository drifts at Yucca Mountain

Radionuclide Uptake and Transport on Microbes in Potential Repository Drifts at Yucca Mountain, Nevada

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