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33 results on '"Beckmann, Benjamin"'

1. JWST ERS Program Q3D: The pitfalls of virial BH mass constraints shown in a z = 3 quasar with an ultramassive host

Author

Bertemes, Caroline, Wylezalek, Dominika, Rupke, David S. N., Zakamska, Nadia L., Veilleux, Sylvain, Beckmann, Benjamin, Vayner, Andrey, Sankar, Swetha, Ishikawa, Yuzo, Diachenko, Nadiia, Liu, Weizhe, Chen, Yu-Ching, Seebeck, Jerome, Lutz, Dieter, and Liu, Guilin

Subjects
Astrophysics - Astrophysics of Galaxies
Abstract

We present JWST MIRI/NIRSpec observations of the extremely red quasar SDSS J165202.64+172852.3 at z~3, one of the most luminous quasars known to date, driving powerful outflows and hosting a clumpy starburst, amidst several interacting companions. We estimate the black hole (BH) mass of the system based on the broad H$\alpha$ and H$\beta$ lines, as well as the Pa$\beta$ emission in the IR and MgII in the UV. We recover a very broad range of mass estimates, with constraints ranging between log $M_{\rm BH}$=9 and 10.1, which is exacerbated if imposing a uniform BLR geometry at all wavelengths. Several factors may contribute to the large spread: measurement uncertainties (insufficient sensitivity to detect the broadest component of the faint Pa$\beta$ line, spectral blending, ambiguities in the broad/narrow component distinction), lack of virial equilibrium (in a system characterised by powerful outflows and rapid accretion), and uncertainties on the luminosity-inferred size of the broad line region, a.o. given central dust obscuration. We constrain the stellar mass via SED fitting, suggesting the host to be extremely massive at $10^{12.8\pm 0.5} M_\odot$ - ~2 dex above the characteristic mass of the Schechter fit to the z=3 stellar mass function. Notably, J1652's central BH might be interpreted as being either undermassive, overmassive, or in line with the BH mass-stellar mass relation, depending on the choice of assumptions. The recovered Eddington ratio varies accordingly, but exceeds 10% in any case. We put our results into context by providing an extensive overview and discussion of recent literature results and their associated assumptions. Our findings provide an important demonstration of the uncertainties inherent in virial BH mass estimates, which are of particular relevance in the JWST era given the growing number of studies on rapidly accreting quasars at high redshift., Comment: 15 pages, 7 figures, submitted to A&A, comments welcome

Published
2024

2. Cloud Computing-Based Marketplace for Collaborative Design and Manufacturing

Author

Banerjee, Ashis Gopal, Beckmann, Benjamin, Carbone, John, DeRose, Lynn, Giani, Annarita, Koudal, Peter, Mackenzie, Patricia, Salvo, Joseph, Yang, Dan, Yund, Walter, Akan, Ozgur, Series editor, Bellavista, Paolo, Series editor, Cao, Jiannong, Series editor, Coulson, Geoffrey, Series editor, Dressler, Falko, Series editor, Ferrari, Domenico, Series editor, Gerla, Mario, Series editor, Kobayashi, Hisashi, Series editor, Palazzo, Sergio, Series editor, Sahni, Sartaj, Series editor, Shen, Xuemin Sherman, Series editor, Stan, Mircea, Series editor, Xiaohua, Jia, Series editor, Zomaya, Albert Y., Series editor, Mandler, Benny, editor, Marquez-Barja, Johann, editor, Mitre Campista, Miguel Elias, editor, Cagáňová, Dagmar, editor, Chaouchi, Hakima, editor, Zeadally, Sherali, editor, Badra, Mohamad, editor, Giordano, Stefano, editor, Fazio, Maria, editor, Somov, Andrey, editor, and Vieriu, Radu-Laurentiu, editor

Published
2016
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3. HybrID: A Hybridization of Indirect and Direct Encodings for Evolutionary Computation

Author

Clune, Jeff, Beckmann, Benjamin E., Pennock, Robert T., Ofria, Charles, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Nierstrasz, Oscar, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Sudan, Madhu, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Vardi, Moshe Y., Series editor, Weikum, Gerhard, Series editor, Goebel, Randy, editor, Siekmann, Jörg, editor, Wahlster, Wolfgang, editor, Kampis, George, editor, Karsai, István, editor, and Szathmáry, Eörs, editor

Published
2011
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7. Harnessing digital evolution

Author

McKinley, Philip, Cheng, Betty H.C., Ofria, Charles, Knoester, David, Beckmann, Benjamin, and Goldsby, Heather

Subjects
Computer design, Company business management, Computer design -- Management, Computer architecture -- Management
Published
2008

14. Crowd-driven Ecosystem for Evolutionary Design

Author

GENERAL ELECTRIC GLOBAL RESEARCH NIKSAYUNA NY, Cao, Qing, Wallace, David R, Beckmann, Benjamin, Citriniti, Thomas, Chigani, Amine, GENERAL ELECTRIC GLOBAL RESEARCH NIKSAYUNA NY, Cao, Qing, Wallace, David R, Beckmann, Benjamin, Citriniti, Thomas, and Chigani, Amine

Abstract

GE Global Research and Massachusetts Institute of Technology jointly developed a crowdsourcing platform to support DARPA s vehicleforge.mil program to revolutionize modern-day design and manufacturing. Our vision is to build a crowd-driven ecosystem for evolutionary design (CEED). It will connect data, design tools and simulations in a collaborative environment to accelerate the design of highly complex industrial systems. Such an environment allows designers to team up to develop projects concurrently. Developers from different spaces will be able to form design communities and create a common project space. This space will allow them to manage processes as a team and track changes and updates on their project. Furthermore, the CEED platform provides a marketplace where contributors can choose to expose their ideas to the public either as open source or as IP protected services. The exposed design models, or models available for review in this open community, will experience market pressures that ultimately allow for the best designs to emerge. The CEED platform also embeds social media connections to maximize crowd engagement., The original document contains color images. Prepared in cooperation with Massachusetts Inst. of Tech., Cambridge, MA.

Published
2012

32. Directed Evolution of Communication and Cooperation in Digital Organisms.

Author

Carbonell, Jaime G., Siekmann, Jörg, Almeida e Costa, Fernando, Rocha, Luis Mateus, Costa, Ernesto, Harvey, Inman, Coutinho, António, Knoester, David B., McKinley, Philip K., Beckmann, Benjamin, and Ofria, Charles

Abstract

This paper describes a study in the use of digital evolution to produce cooperative communication behavior in a population of digital organisms. The results demonstrate that digital evolution can produce organisms capable of distributed problem solving through interactions between members of the population and their environment. Specifically, the organisms cooperate to distribute among the population the largest value sensed from the environment. These digital organisms have no "built-in" ability to perform this task; each population begins with a single organism that has only the ability to self-replicate. Over thousands of generations, random mutations and natural selection produce an instruction sequence that realizes this behavior, despite continuous turnover in the population. [ABSTRACT FROM AUTHOR]

Published
2007
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33. Evolution of an Adaptive Sleep Response in Digital Organisms.

Author

Carbonell, Jaime G., Siekmann, Jörg, Almeida e Costa, Fernando, Rocha, Luis Mateus, Costa, Ernesto, Harvey, Inman, Coutinho, António, Beckmann, Benjamin E., McKinley, Philip K., and Ofria, Charles

Abstract

Adaptive responses to resource availability are common in natural systems. In this paper we explore one possible evolutionary cause of adaptive sleep/wake behavior. We subjected populations of digital organisms to an environment with a slowly diminishing resource and recorded their ability to adapt to the changing environment using sleep. We also quantified the selective pressure not to sleep in this competitive environment. We observed that diminishing resource availability can promote adaptive sleep responses in digital organisms even when there is an opportunity cost associated with sleeping. [ABSTRACT FROM AUTHOR]

Published
2007
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