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Your search keyword '"Buckley-Geer, Elizabeth"' showing total 7 results
Start Over Author "Buckley-Geer, Elizabeth" Journal monthly notices of the royal astronomical society
7 results on '"Buckley-Geer, Elizabeth"'

1. Project Dinos I: A joint lensing–dynamics constraint on the deviation from the power law in the mass profile of massive ellipticals.

Author

Tan, Chin Yi, Shajib, Anowar J, Birrer, Simon, Sonnenfeld, Alessandro, Treu, Tommaso, Wells, Patrick, Williams, Devon, Buckley-Geer, Elizabeth J, Drlica-Wagner, Alex, and Frieman, Joshua

Subjects
ELLIPTICAL galaxies, DARK matter, ASTROPHYSICS, GALACTIC redshift, SPACE telescopes, STELLAR dynamics
Abstract

The mass distribution in massive elliptical galaxies encodes their evolutionary history, thus providing an avenue to constrain the baryonic astrophysics in their evolution. The power-law assumption for the radial mass profile in ellipticals has been sufficient to describe several observables to the noise level, including strong lensing and stellar dynamics. In this paper, we quantitatively constrained any deviation, or the lack thereof, from the power-law mass profile in massive ellipticals through joint lensing–dynamics analysis of a large statistical sample with 77 galaxy–galaxy lens systems. We performed an improved and uniform lens modelling of these systems from archival Hubble Space Telescope imaging using the automated lens modelling pipeline dolphin. We combined the lens model posteriors with the stellar dynamics to constrain the deviation from the power law after accounting for the line-of-sight lensing effects, a first for analyses on galaxy–galaxy lenses. We find that the Sloan Lens ACS Survey lens galaxies with a mean redshift of 0.2 are consistent with the power-law profile within 1.1σ (2.8σ) and the Strong Lensing Legacy Survey lens galaxies with a mean redshift of 0.6 are consistent within 0.8σ (2.1σ), for a spatially constant (Osipkov–Merritt) stellar anisotropy profile. We adopted the spatially constant anisotropy profile as our baseline choice based on previous dynamical observables of local ellipticals. However, spatially resolved stellar kinematics of lens galaxies are necessary to differentiate between the two anisotropy models. Future studies will use our lens models to constrain the mass distribution individually in the dark matter and baryonic components. [ABSTRACT FROM AUTHOR]

Published
2024
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2. The impact of human expert visual inspection on the discovery of strong gravitational lenses

Author

Rojas, Karina, primary, Collett, Thomas E, additional, Ballard, Daniel, additional, Magee, Mark R, additional, Birrer, Simon, additional, Buckley-Geer, Elizabeth, additional, Chan, James H H, additional, Clément, Benjamin, additional, Diego, José M, additional, Gentile, Fabrizio, additional, González, Jimena, additional, Joseph, Rémy, additional, Mastache, Jorge, additional, Schuldt, Stefan, additional, Tortora, Crescenzo, additional, Verdugo, Tomás, additional, Verma, Aprajita, additional, Daylan, Tansu, additional, Millon, Martin, additional, Jackson, Neal, additional, Dye, Simon, additional, Melo, Alejandra, additional, Mahler, Guillaume, additional, Ogando, Ricardo L C, additional, Courbin, Frédéric, additional, Fritz, Alexander, additional, Herle, Aniruddh, additional, Acevedo Barroso, Javier A, additional, Cañameras, Raoul, additional, Cornen, Claude, additional, Dhanasingham, Birendra, additional, Glazebrook, Karl, additional, Martinez, Michael N, additional, Ryczanowski, Dan, additional, Savary, Elodie, additional, Góis-Silva, Filipe, additional, Arturo Ureña-López, L, additional, Wiesner, Matthew P, additional, Wilde, Joshua, additional, Valim Calçada, Gabriel, additional, Cabanac, Rémi, additional, Pan, Yue, additional, Sierra, Isaac, additional, Despali, Giulia, additional, Cavalcante-Gomes, Micaele V, additional, Macmillan, Christine, additional, Maresca, Jacob, additional, Grudskaia, Aleksandra, additional, O’Donnell, Jackson H, additional, Paic, Eric, additional, Niemiec, Anna, additional, de la Bella, Lucia F, additional, Bromley, Jane, additional, Williams, Devon M, additional, More, Anupreeta, additional, and Levine., Benjamin C, additional

Published
2023
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3. Discovery of a Candidate Binary Supermassive Black Hole in a Periodic Quasar from Circumbinary Accretion Variability

Author

Liao, Wei-Ting, primary, Chen, Yu-Ching, additional, Liu, Xin, additional, Holgado, A Miguel, additional, Guo, Hengxiao, additional, Gruendl, Robert, additional, Morganson, Eric, additional, Shen, Yue, additional, Davis, Tamara, additional, Kessler, Richard, additional, Martini, Paul, additional, McMahon, Richard G, additional, Allam, Sahar, additional, Annis, James, additional, Avila, Santiago, additional, Banerji, Manda, additional, Bechtol, Keith, additional, Bertin, Emmanuel, additional, Brooks, David, additional, Buckley-Geer, Elizabeth, additional, Rosell, Aurelio Carnero, additional, Kind, Matias Carrasco, additional, Carretero, Jorge, additional, Castander, Francisco Javier, additional, Cunha, Carlos, additional, D’Andrea, Chris, additional, da Costa, Luiz, additional, Davis, Christopher, additional, De Vicente, Juan, additional, Desai, Shantanu, additional, Diehl, H Thomas, additional, Doel, Peter, additional, Eifler, Tim, additional, Evrard, August, additional, Flaugher, Brenna, additional, Fosalba, Pablo, additional, Frieman, Josh, additional, Garcia-Bellido, Juan, additional, Gaztanaga, Enrique, additional, Glazebrook, Karl, additional, Gruen, Daniel, additional, Gschwend, Julia, additional, Gutierrez, Gaston, additional, Hartley, Will, additional, Hollowood, Devon L, additional, Honscheid, Klaus, additional, Hoyle, Ben, additional, James, David, additional, Krause, Elisabeth, additional, Kuehn, Kyler, additional, Lima, Marcos, additional, Maia, Marcio, additional, Marshall, Jennifer, additional, Menanteau, Felipe, additional, Miquel, Ramon, additional, Malagń, Andrés Plazas, additional, Roodman, Aaron, additional, Sanchez, Eusebio, additional, Scarpine, Vic, additional, Schubnell, Michael, additional, Serrano, Santiago, additional, Smith, Mathew, additional, Smith, R Chris, additional, Soares-Santos, Marcelle, additional, Sobreira, Flavia, additional, Suchyta, Eric, additional, Swanson, Molly, additional, Tarle, Gregory, additional, Vikram, Vinu, additional, and Walker, Alistair, additional

Published
2020
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4. Spectral variability of a sample of extreme variability quasars and implications for the Mg iibroad-line region

Author

Yang, Qian, primary, Shen, Yue, additional, Chen, Yu-Ching, additional, Liu, Xin, additional, Annis, James, additional, Avila, Santiago, additional, Bertin, Emmanuel, additional, Brooks, David, additional, Buckley-Geer, Elizabeth, additional, Carnero Rosell, Aurelio, additional, Carrasco Kind, Matias, additional, Carretero, Jorge, additional, da Costa, Luiz, additional, Desai, Shantanu, additional, Thomas Diehl, H, additional, Doel, Peter, additional, Frieman, Josh, additional, Garcia-Bellido, Juan, additional, Gaztanaga, Enrique, additional, Gerdes, David, additional, Gruen, Daniel, additional, Gruendl, Robert, additional, Gschwend, Julia, additional, Gutierrez, Gaston, additional, Hollowood, Devon L, additional, Honscheid, Klaus, additional, Hoyle, Ben, additional, James, David, additional, Krause, Elisabeth, additional, Kuehn, Kyler, additional, Lidman, Christopher, additional, Lima, Marcos, additional, Maia, Marcio, additional, Marshall, Jennifer, additional, Martini, Paul, additional, Menanteau, Felipe, additional, Miquel, Ramon, additional, Plazas Malagón, Andrés, additional, Sanchez, Eusebio, additional, Scarpine, Vic, additional, Schindler, Rafe, additional, Schubnell, Michael, additional, Serrano, Santiago, additional, Sevilla, Ignacio, additional, Smith, Mathew, additional, Soares-Santos, Marcelle, additional, Sobreira, Flavia, additional, Suchyta, Eric, additional, Swanson, Molly, additional, Tarle, Gregory, additional, Vikram, Vinu, additional, and Walker, Alistair, additional

Published
2020
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5. Spectral variability of a sample of extreme variability quasars and implications for the Mg ii broad-line region.

Author

Yang, Qian, Shen, Yue, Chen, Yu-Ching, Liu, Xin, Annis, James, Avila, Santiago, Bertin, Emmanuel, Brooks, David, Buckley-Geer, Elizabeth, Carnero Rosell, Aurelio, Carrasco Kind, Matias, Carretero, Jorge, da Costa, Luiz, Desai, Shantanu, Thomas Diehl, H, Doel, Peter, Frieman, Josh, Garcia-Bellido, Juan, Gaztanaga, Enrique, and Gerdes, David

Subjects
QUASARS, DARK energy, OPTICAL spectroscopy, ASTRONOMICAL surveys, BLACK holes, STATISTICAL sampling
Abstract

We present new Gemini/GMOS optical spectroscopy of 16 extreme variability quasars (EVQs) that dimmed by more than 1.5 mag in the g band between the Sloan Digital Sky Survey (SDSS) and the Dark Energy Survey epochs (separated by a few years in the quasar rest frame). These EVQs are selected from quasars in the SDSS Stripe 82 region, covering a redshift range of 0.5 < z < 2.1. Nearly half of these EVQs brightened significantly (by more than 0.5 mag in the g band) in a few years after reaching their previous faintest state, and some EVQs showed rapid (non-blazar) variations of greater than 1–2 mag on time-scales of only months. To increase sample statistics, we use a supplemental sample of 33 EVQs with multi-epoch spectra from SDSS that cover the broad Mg  ii  λ2798 line. Leveraging on the large dynamic range in continuum variability between the multi-epoch spectra, we explore the associated variations in the broad Mg  ii line, whose variability properties have not been well studied before. The broad Mg  ii flux varies in the same direction as the continuum flux, albeit with a smaller amplitude, which indicates at least some portion of Mg  ii is reverberating to continuum changes. However, the full width at half-maximum (FWHM) of Mg  ii does not vary accordingly as continuum changes for most objects in the sample, in contrast to the case of the broad Balmer lines. Using the width of broad Mg  ii to estimate the black hole mass with single epoch spectra therefore introduces a luminosity-dependent bias. [ABSTRACT FROM AUTHOR]

Published
2020
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6. VDES J2325−5229 az= 2.7 gravitationally lensed quasar discovered using morphology-independent supervised machine learning

Author

Ostrovski, Fernanda, primary, McMahon, Richard G., additional, Connolly, Andrew J., additional, Lemon, Cameron A., additional, Auger, Matthew W., additional, Banerji, Manda, additional, Hung, Johnathan M., additional, Koposov, Sergey E., additional, Lidman, Christopher E., additional, Reed, Sophie L., additional, Allam, Sahar, additional, Benoit-Lévy, Aurélien, additional, Bertin, Emmanuel, additional, Brooks, David, additional, Buckley-Geer, Elizabeth, additional, Carnero Rosell, Aurelio, additional, Carrasco Kind, Matias, additional, Carretero, Jorge, additional, Cunha, Carlos E., additional, da Costa, Luiz N., additional, Desai, Shantanu, additional, Diehl, H. Thomas, additional, Dietrich, Jörg P., additional, Evrard, August E., additional, Finley, David A., additional, Flaugher, Brenna, additional, Fosalba, Pablo, additional, Frieman, Josh, additional, Gerdes, David W., additional, Goldstein, Daniel A., additional, Gruen, Daniel, additional, Gruendl, Robert A., additional, Gutierrez, Gaston, additional, Honscheid, Klaus, additional, James, David J., additional, Kuehn, Kyler, additional, Kuropatkin, Nikolay, additional, Lima, Marcos, additional, Lin, Huan, additional, Maia, Marcio A. G., additional, Marshall, Jennifer L., additional, Martini, Paul, additional, Melchior, Peter, additional, Miquel, Ramon, additional, Ogando, Ricardo, additional, Plazas Malagón, Andrés, additional, Reil, Kevin, additional, Romer, Kathy, additional, Sanchez, Eusebio, additional, Santiago, Basilio, additional, Scarpine, Vic, additional, Sevilla-Noarbe, Ignacio, additional, Soares-Santos, Marcelle, additional, Sobreira, Flavia, additional, Suchyta, Eric, additional, Tarle, Gregory, additional, Thomas, Daniel, additional, Tucker, Douglas L., additional, and Walker, Alistair R., additional

Published
2016
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7. VDES J2325-5229 a z = 2.7 gravitationally lensed quasar discovered using morphology-independent supervised machine learning.

Author

Ostrovski, Fernanda, McMahon, Richard G., Connolly, Andrew J., Lemon, Cameron A., Auger, Matthew W., Banerji, Manda, Hung, Johnathan M., Koposov, Sergey E., Lidman, Christopher E., Reed, Sophie L., Allam, Sahar, Benoit-Lévy, Aurélien, Bertin, Emmanuel, Brooks, David, Buckley-Geer, Elizabeth, Carnero Rosell, Aurelio, Carrasco Kind, Matias, Carretero, Jorge, Cunha, Carlos E., and da Costa, Luiz N.

Subjects
QUASARS, GRAVITATIONAL lenses, MACHINE learning, GALACTIC redshift, ELLIPTICAL galaxies, GAUSSIAN mixture models
Abstract

We present the discovery and preliminary characterization of a gravitationally lensed quasar with a source redshift zs = 2.74 and image separation of 2.9 arcsec lensed by a foreground zl = 0.40 elliptical galaxy. Since optical observations of gravitationally lensed quasars show the lens system as a superposition of multiple point sources and a foreground lensing galaxy, we have developed a morphology-independent multi-wavelength approach to the photometric selection of lensed quasar candidates based on Gaussian Mixture Models (GMM) supervised machine learning. Using this technique and gi multicolour photometric observations from the Dark Energy Survey (DES), near-IR JK photometry from the VISTA Hemisphere Survey (VHS) and WISE mid-IR photometry, we have identified a candidate system with two catalogue components with iAB = 18.61 and iAB = 20.44 comprising an elliptical galaxy and two blue point sources. Spectroscopic follow-up with NTT and the use of an archival AAT spectrum show that the point sources can be identified as a lensed quasar with an emission line redshift of z = 2.739 ± 0.003 and a foreground early-type galaxy with z = 0.400 ± 0.002. We model the system as a single isothermal ellipsoid and find the Einstein radius θE ~ 1.47 arcsec, enclosed mass Menc ~ 4 x 1011 Mʘ and a time delay of ~52 d. The relatively wide separation, month scale time delay duration and high redshift make this an ideal system for constraining the expansion rate beyond a redshift of 1. [ABSTRACT FROM AUTHOR]

Published
2017
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