Zobrazeno 1 - 10
of 101
pro vyhledávání: '"Boroson, Todd"'
Autor:
Runnoe, Jessie, Boroson, Todd
We highlight a representative sample of active galactic nuclei selected independent of orientation. The defining characteristic of the selection is sophisticated matching between the $0.1
Externí odkaz:
http://arxiv.org/abs/2004.07196
Autor:
Nguyen, Khai, Bogdanovic, Tamara, Runnoe, Jessie C., Eracleous, Michael, Sigurdsson, Steinn, Boroson, Todd
We present a method for comparing the H$\beta$ emission-line profiles of observed supermassive black hole (SBHB) candidates and models of sub-parsec SBHBs in circumbinary disks. Using the approach based on principal component analysis we infer the va
Externí odkaz:
http://arxiv.org/abs/1908.01799
Autor:
Nguyen, Khai, Bogdanovic, Tamara, Runnoe, Jessie C., Eracleous, Michael, Sigurdsson, Steinn, Boroson, Todd
We present an improved semi-analytic model for calculation of the broad optical emission-line signatures from sub-parsec supermassive black hole binaries (SBHBs) in circumbinary disks. The second-generation model improves upon the treatment of radiat
Externí odkaz:
http://arxiv.org/abs/1807.09782
Autor:
Pflueger, Bryan J., Nguyen, Khai, Bogdanovic, Tamara, Eracleous, Michael, Runnoe, Jessie C., Sigurdsson, Steinn, Boroson, Todd
Motivated by observational searches for sub-parsec supermassive black hole binaries (SBHBs) we develop a modular analytic model to determine the likelihood for detection of SBHBs by ongoing spectroscopic surveys. The model combines the parametrized r
Externí odkaz:
http://arxiv.org/abs/1803.02368
Autor:
Runnoe, Jessie C., Eracleous, Michael, Pennell, Alison, Mathes, Gavin, Boroson, Todd, Sigurdsson, Steinn, Bogdanovic, Tamara, Halpern, Jules P., Liu, Jia, Brown, Stephanie
We have been spectroscopically monitoring 88 quasars selected to have broad H$\beta$ emission lines offset from their systemic redshift by thousands of km s$^{-1}$. By analogy with single-lined spectroscopic binary stars, we consider these quasars to
Externí odkaz:
http://arxiv.org/abs/1702.05465
Autor:
Runnoe, Jessie C., Eracleous, Michael, Mathes, Gavin, Pennell, Alison, Boroson, Todd, Sigurdsson, Steinn, Bogdanovic, Tamara, Halpern, Jules P., Liu, Jia
We present new spectroscopic observations that are part of our continuing monitoring campaign of 88 quasars at z<0.7 whose broad H$\beta$ lines are offset from their systemic redshifts by a few thousand km/s. These quasars have been considered candid
Externí odkaz:
http://arxiv.org/abs/1509.02575
Autor:
Pickles, Andrew, Hjelstrom, Annie, Boroson, Todd, Burleson, Ben, Conway, Patrick, de Vera, Jon, Elphick, Mark, Haworth, Brian, Rosing, Wayne, Saunders, Eric, Thomas, Doug, White, Gary, Willis, Mark, Walker, Zach
We describe the operational capabilities of the Las Cumbres Observatory Global Telescope Network. We summarize our hardware and software for maintaining and monitoring network health. We focus on methodologies to utilize the automated system to monit
Externí odkaz:
http://arxiv.org/abs/1407.3284
Autor:
Boroson, Todd Allan
The relation between central or mean metallicity and luminosity in elliptical galaxies is a well observed phenomenon. Theoretical explanations proposed for this relation include scenarios in which peak metallicities are determined either by the epoch
Externí odkaz:
http://hdl.handle.net/10150/282503
Unification by orientation is a ubiquitous concept in the study of active galactic nuclei. A gold standard of the orientation paradigm is the hypothesis that radio galaxies and radio-loud quasars are intrinsically the same, but are observed over diff
Externí odkaz:
http://arxiv.org/abs/1307.1731
[ABRIDGED] We have carried out a systematic search for close supermassive black hole binaries among z < 0.7 SDSS quasars Such binaries are predicted by models of supermassive black hole and host galaxy co-evolution, therefore their census and populat
Externí odkaz:
http://arxiv.org/abs/1106.2952