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352 results on '"Lawrence, Jon S"'

52. The SAMI Galaxy Survey: flipping of the spin–filament alignment correlates most strongly with growth of the bulge

Author

Barsanti, Stefania, primary, Colless, Matthew, additional, Welker, Charlotte, additional, Oh, Sree, additional, Casura, Sarah, additional, Bryant, Julia J, additional, Croom, Scott M, additional, D’Eugenio, Francesco, additional, Lawrence, Jon S, additional, Richards, Samuel N, additional, and van de Sande, Jesse, additional

Published
2022
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53. Achromatic nulling interferometry and fringe tracking with 3D-photonic tricouplers with GLINT

Author

Martinod, Marc-Antoine, primary, Deyi Maria Klinner-teo, Teresa, additional, Tuthill, Peter G., additional, Gross, Simon, additional, Arcadi, Elizabeth, additional, Douglass, Glen, additional, Webb, Jacinda, additional, Norris, Barnaby R. M., additional, Guyon, Olivier, additional, Lozi, Julien, additional, Lagadec, Tiphaine, additional, Jovanovic, Nemanja, additional, Cvetojevic, Nick, additional, Arriola, Alexander, additional, Gretzinger, Thomas, additional, Withford, Michael J., additional, Lawrence, Jon S., additional, and Leon-Saval, Sergio, additional

Published
2022
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54. Optimal self-calibration and fringe tracking in photonic nulling interferometers using machine learning

Author

Norris, Barnaby R. M., primary, Martinod, Marc-Antoine, additional, Tuthill, Peter G., additional, Gross, Simon, additional, Cvetojevic, Nick, additional, Jovanovic, Nemanja, additional, Lagadec, Tiphaine, additional, Deyi Maria Klinner-teo, Teresa, additional, Guyon, Olivier, additional, Lozi, Julien, additional, Deo, Vincent, additional, Vievard, Sébastien B., additional, Arriola, Alex, additional, Gretzinger, Thomas, additional, Lawrence, Jon S., additional, and Withford, Michael J., additional

Published
2022
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55. The SAMI Galaxy Survey: the relationship between galaxy rotation and the motion of neighbours

Author

Mai, Yifan, primary, Vaughan, Sam P, additional, Croom, Scott M, additional, van de Sande, Jesse, additional, Barsanti, Stefania, additional, Bland-Hawthorn, Joss, additional, Brough, Sarah, additional, Bryant, Julia J, additional, Colless, Matthew, additional, Goodwin, Michael, additional, Groves, Brent, additional, Konstantopoulos, Iraklis S, additional, Lawrence, Jon S, additional, Lorente, Nuria P F, additional, and Richards, Samuel N, additional

Published
2022
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56. The LEGA-C and SAMI Galaxy Surveys:Quiescent Stellar Populations and the Mass-Size Plane across 6 Gyr

Author

Barone, Tania M., D'Eugenio, Francesco, Scott, Nicholas, Colless, Matthew, Vaughan, Sam P., Wel, Arjen van der, Fraser-McKelvie, Amelia, Graaff, Anna de, Sande, Jesse van de, Wu, Po-Feng, Bezanson, Rachel, Brough, Sarah, Bell, Eric, Croom, Scott M., Cortese, Luca, Driver, Simon, Gallazzi, Anna R., Muzzin, Adam, Sobral, David, Bland-Hawthorn, Joss, Bryant, Julia J., Goodwin, Michael, Lawrence, Jon S., Lorente, Nuria P. F., Owers, Matt S., Barone, Tania M., D'Eugenio, Francesco, Scott, Nicholas, Colless, Matthew, Vaughan, Sam P., Wel, Arjen van der, Fraser-McKelvie, Amelia, Graaff, Anna de, Sande, Jesse van de, Wu, Po-Feng, Bezanson, Rachel, Brough, Sarah, Bell, Eric, Croom, Scott M., Cortese, Luca, Driver, Simon, Gallazzi, Anna R., Muzzin, Adam, Sobral, David, Bland-Hawthorn, Joss, Bryant, Julia J., Goodwin, Michael, Lawrence, Jon S., Lorente, Nuria P. F., and Owers, Matt S.

Abstract

We investigate the change in mean stellar population age and metallicity ([Z/H]) scaling relations for quiescent galaxies from intermediate redshift ($0.60\leq z\leq0.76$) using the LEGA-C Survey, to low redshift ($0.014\leq z\leq0.10$) using the SAMI Galaxy Survey. We find that, similarly to their low-redshift counterparts, the stellar metallicity of quiescent galaxies at $0.60\leq z\leq 0.76$ closely correlates with $M_*/R_\mathrm{e}$ (a proxy for the gravitational potential or escape velocity), in that galaxies with deeper potential wells are more metal-rich. This supports the hypothesis that the relation arises due to the gravitational potential regulating the retention of metals, by determining the escape velocity required by metal-rich stellar and supernova ejecta to escape the system and avoid being recycled into later stellar generations. On the other hand, we find no correlation between stellar age and $M_*/R_\mathrm{e}^2$ (stellar mass surface density $\Sigma$) in the LEGA-C sample, despite this being a strong relation at low redshift. We consider this change in the age--$\Sigma$ relation in the context of the redshift evolution of the star-forming and quiescent populations in the mass--size plane, and find our results can be explained as a consequence of galaxies forming more compactly at higher redshifts, and remaining compact throughout their evolution. Furthermore, galaxies appear to quench at a characteristic surface density that decreases with decreasing redshift. The $z\sim 0$ age--$\Sigma$ relation is therefore a result of building up the quiescent and star-forming populations with galaxies that formed at a range of redshifts and so a range of surface densities.

Published
2022

57. Airglow and Aurorae at Dome A, Antarctica

Author

Sims, Geoff, Ashley, Michael C. B., Cui, Xiangqun, Everett, Jon R., Feng, LongLong, Gong, Xuefei, Hengst, Shane, Hu, Zhongwen, Lawrence, Jon S., Luong-Van, Daniel M., Moore, Anna M., Riddle, Reed, Shang, Zhaohui, Storey, John W. V., Tothill, Nick, Travouillon, Tony, Wang, Lifan, Yang, Huigen, Yang, Ji, Zhou, Xu, and Zhu, Zhenxi

Published
2012
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59. The SAMI Galaxy Survey: the link between [α/Fe] and kinematic morphology

Author

Watson, Peter J, primary, Davies, Roger L, additional, van de Sande, Jesse, additional, Brough, Sarah, additional, Croom, Scott M, additional, D’Eugenio, Francesco, additional, Glazebrook, Karl, additional, Groves, Brent, additional, López-Sánchez, Ángel R, additional, Scott, Nicholas, additional, Vaughan, Sam P, additional, Walcher, C Jakob, additional, Bland-Hawthorn, Joss, additional, Bryant, Julia J, additional, Goodwin, Michael, additional, Lawrence, Jon S, additional, Lorente, Nuria P F, additional, Owers, Matt S, additional, and Richards, Samuel, additional

Published
2022
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60. The SAMI Galaxy Survey: The Internal Orbital Structure and Mass Distribution of Passive Galaxies from Triaxial Orbit-superposition Schwarzschild Models

Author

Santucci, Giulia, primary, Brough, Sarah, additional, van de Sande, Jesse, additional, McDermid, Richard M., additional, van de Ven, Glenn, additional, Zhu, Ling, additional, D’Eugenio, Francesco, additional, Bland-Hawthorn, Joss, additional, Barsanti, Stefania, additional, Bryant, Julia J., additional, M. Croom, Scott, additional, Davies, Roger L., additional, Green, Andrew W., additional, Lawrence, Jon S., additional, Lorente, Nuria P. F., additional, Owers, Matt S., additional, Poci, Adriano, additional, Richards, Samuel N., additional, Thater, Sabine, additional, and Yi, Sukyoung, additional

Published
2022
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61. The LEGA-C and SAMI galaxy surveys: quiescent stellar populations and the mass–size plane across 6 Gyr

Author

Barone, Tania M, primary, D’Eugenio, Francesco, additional, Scott, Nicholas, additional, Colless, Matthew, additional, Vaughan, Sam P, additional, van der Wel, Arjen, additional, Fraser-McKelvie, Amelia, additional, de Graaff, Anna, additional, van de Sande, Jesse, additional, Wu(吳柏鋒), Po-Feng, additional, Bezanson, Rachel, additional, Brough, Sarah, additional, Bell, Eric, additional, Croom, Scott M, additional, Cortese, Luca, additional, Driver, Simon, additional, Gallazzi, Anna R, additional, Muzzin, Adam, additional, Sobral, David, additional, Bland-Hawthorn, Joss, additional, Bryant, Julia J, additional, Goodwin, Michael, additional, Lawrence, Jon S, additional, Lorente, Nuria P F, additional, and Owers, Matt S, additional

Published
2022
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62. The SAMI Galaxy Survey: the difference between ionized gas and stellar velocity dispersions

Author

Oh, Sree, primary, Colless, Matthew, additional, D’Eugenio, Francesco, additional, Croom, Scott M, additional, Cortese, Luca, additional, Groves, Brent, additional, Kewley, Lisa J, additional, van de Sande, Jesse, additional, Zovaro, Henry, additional, Varidel, Mathew R, additional, Barsanti, Stefania, additional, Bland-Hawthorn, Joss, additional, Brough, Sarah, additional, Bryant, Julia J, additional, Casura, Sarah, additional, Lawrence, Jon S, additional, Lorente, Nuria P F, additional, Medling, Anne M, additional, Owers, Matt S, additional, and Yi, Sukyoung K, additional

Published
2022
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63. The SAMI Galaxy Survey: trends in [α/Fe] as a function of morphology and environment

Author

Watson, Peter J, primary, Davies, Roger L, additional, Brough, Sarah, additional, Croom, Scott M, additional, D’Eugenio, Francesco, additional, Glazebrook, Karl, additional, Groves, Brent, additional, López-Sánchez, Ángel R, additional, van de Sande, Jesse, additional, Scott, Nicholas, additional, Vaughan, Sam P, additional, Walcher, Jakob, additional, Bland-Hawthorn, Joss, additional, Bryant, Julia J, additional, Goodwin, Michael, additional, Lawrence, Jon S, additional, Lorente, Nuria P F, additional, Owers, Matt S, additional, and Richards, Samuel, additional

Published
2021
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64. SAMI Galaxy Survey: flipping of the spin–filament alignment correlates most strongly with growth of the bulge.

Author

Barsanti, Stefania, Colless, Matthew, Welker, Charlotte, Oh, Sree, Casura, Sarah, Bryant, Julia J, Croom, Scott M, D'Eugenio, Francesco, Lawrence, Jon S, Richards, Samuel N, and van de Sande, Jesse

Subjects
GALAXIES, GALACTIC bulges, STAR formation, LARGE scale structure (Astronomy), STELLAR mass
Abstract

We study the alignments of galaxy spin axes with respect to cosmic web filaments as a function of various properties of the galaxies and their constituent bulges and discs. We exploit the SAMI Galaxy Survey to identify 3D spin axes from spatially resolved stellar kinematics and to decompose the galaxy into the kinematic bulge and disc components. The GAMA survey is used to reconstruct the cosmic filaments. The mass of the bulge, defined as the product of stellar mass and bulge-to-total flux ratio M bulge = M ⋆ × (B/T), is the primary parameter of correlation with spin–filament alignments: galaxies with lower bulge masses tend to have their spins parallel to the closest filament, while galaxies with higher bulge masses are more perpendicularly aligned. M ⋆ and B/T separately show correlations, but they do not fully unravel spin–filament alignments. Other galaxy properties, such as visual morphology, stellar age, star formation activity, kinematic parameters, and local environment, are secondary tracers. Focussing on S0 galaxies, we find preferentially perpendicular alignments, with the signal dominated by high-mass S0 galaxies. Studying bulge and disc spin–filament alignments separately reveals additional information about the formation pathways of the corresponding galaxies: bulges tend to have more perpendicular alignments, while discs show different tendencies according to their kinematic features and the mass of the associated bulge. The observed correlation between the flipping of spin–filament alignments and the growth of the bulge can be explained by mergers, which drive both alignment flips and bulge formation. [ABSTRACT FROM AUTHOR]

Published
2022
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65. SAMI Galaxy Survey: the relationship between galaxy rotation and the motion of neighbours.

Author

Mai, Yifan, Vaughan, Sam P, Croom, Scott M, van de Sande, Jesse, Barsanti, Stefania, Bland-Hawthorn, Joss, Brough, Sarah, Bryant, Julia J, Colless, Matthew, Goodwin, Michael, Groves, Brent, Konstantopoulos, Iraklis S, Lawrence, Jon S, Lorente, Nuria P F, and Richards, Samuel N

Subjects
ROTATION of galaxies, GALAXIES, STELLAR mass, ANGULAR momentum (Mechanics), NEIGHBORS
Abstract

Using data from the SAMI Galaxy Survey, we investigate the correlation between the projected stellar kinematic spin vector of 1397 SAMI galaxies and the line-of-sight motion of their neighbouring galaxies. We calculate the luminosity-weighted mean velocity difference between SAMI galaxies and their neighbours in the direction perpendicular to the SAMI galaxies' angular momentum axes. The luminosity-weighted mean velocity offset between SAMI galaxies and neighbours, which indicates the signal of coherence between the rotation of the SAMI galaxies and the motion of neighbours, is 9.0 ± 5.4 km s−1 (1.7σ) for neighbours within 1 Mpc. In a large-scale analysis, we find that the average velocity offsets increase for neighbours out to 2 Mpc. However, the velocities are consistent with zero or negative for neighbours outside 3 Mpc. The negative signals for neighbours at a distance around 10 Mpc are also significant at the ∼2σ level, which indicate that the positive signals within 2 Mpc might come from the variance of large-scale structure. We also calculate average velocities of different subsamples, including galaxies in different regions of the sky, galaxies with different stellar masses, galaxy type, λRe, and inclination. Although subsamples of low-mass, high-mass, early-type, and low-spin galaxies show the 2–3σ signal of coherence for the neighbours within 2 Mpc, the results for different inclination subsamples and large-scale results suggest that the ∼2σ signals might result from coincidental scatter or variance of large-scale structure. Overall, the modest evidence of coherence signals for neighbouring galaxies within 2 Mpc needs to be confirmed by larger samples of observations and simulation studies. [ABSTRACT FROM AUTHOR]

Published
2022
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66. The SAMI Galaxy Survey: Trends in [��/Fe] as a Function of Morphology and Environment

Author

Watson, Peter J., Davies, Roger L., Brough, Sarah, Croom, Scott M., D'Eugenio, Francesco, Glazebrook, Karl, Groves, Brent, L��pez-S��nchez, ��ngel R., van de Sande, Jesse, Scott, Nicholas, Vaughan, Sam P., Walcher, Jakob, Bland-Hawthorn, Joss, Bryant, Julia J., Goodwin, Michael, Lawrence, Jon S., Lorente, Nuria P. F., Owers, Matt S., and Richards, Samuel

Subjects
Astrophysics of Galaxies (astro-ph.GA), FOS: Physical sciences
Abstract

We present a new set of index-based measurements of [$��$/Fe] for a sample of 2093 galaxies in the SAMI Galaxy Survey. Following earlier work, we fit a global relation between [$��$/Fe] and the galaxy velocity dispersion $��$ for red sequence galaxies, [$��$/Fe]=(0.378$\pm$0.009)log($��$/100)+(0.155$\pm$0.003). We observe a correlation between the residuals and the local environmental surface density, whereas no such relation exists for blue cloud galaxies. In the full sample, we find that elliptical galaxies in high-density environments are $��$-enhanced by up to 0.057$\pm$0.014 dex at velocity dispersions $��$, 15 pages, 9 figures. Revised after comments from referee

Published
2021
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67. The SAMI Galaxy Survey: a statistical approach to an optimal classification of stellar kinematics in galaxy surveys

Author

van de Sande, Jesse, primary, Vaughan, Sam P, additional, Cortese, Luca, additional, Scott, Nicholas, additional, Bland-Hawthorn, Joss, additional, Croom, Scott M, additional, Lagos, Claudia D P, additional, Brough, Sarah, additional, Bryant, Julia J, additional, Devriendt, Julien, additional, Dubois, Yohan, additional, D’Eugenio, Francesco, additional, Foster, Caroline, additional, Fraser-McKelvie, Amelia, additional, Harborne, Katherine E, additional, Lawrence, Jon S, additional, Oh, Sree, additional, Owers, Matt S, additional, Poci, Adriano, additional, Remus, Rhea-Silvia, additional, Richards, Samuel N, additional, Schulze, Felix, additional, Sweet, Sarah M, additional, Varidel, Mathew R, additional, and Welker, Charlotte, additional

Published
2021
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69. SAMI Galaxy Survey: the link between [α/Fe] and kinematic morphology.

Author

Watson, Peter J, Davies, Roger L, van de Sande, Jesse, Brough, Sarah, Croom, Scott M, D'Eugenio, Francesco, Glazebrook, Karl, Groves, Brent, López-Sánchez, Ángel R, Scott, Nicholas, Vaughan, Sam P, Walcher, C Jakob, Bland-Hawthorn, Joss, Bryant, Julia J, Goodwin, Michael, Lawrence, Jon S, Lorente, Nuria P F, Owers, Matt S, and Richards, Samuel

Subjects
GALAXIES, STAR formation, STELLAR populations, GALACTIC evolution, ANGULAR momentum (Mechanics), STELLAR mass, GALAXY formation
Abstract

We explore a sample of 1492 galaxies with measurements of the mean stellar population properties and the spin parameter proxy, |$\lambda _{R_{\rm {e}}}$|⁠ , drawn from the SAMI Galaxy Survey. We fit a global |$[\alpha /\rm {Fe}]$| –σ relation, finding that |${[\alpha /\rm {Fe}]}=(0.395\pm 0.010)\rm {log}_{10}(\sigma)-(0.627\pm 0.002)$|⁠. We observe an anti-correlation between the residuals |$\Delta [\alpha /\rm {Fe}]$| and the inclination-corrected |$\lambda _{\, R_{\rm {e}}}^{\rm {\, eo}}$|⁠ , which can be expressed as |${\Delta [\alpha /\rm {Fe}]}=(-0.057\pm 0.008){\lambda _{\, R_{\rm {e}}}^{\rm {\, eo}}}+(0.020\pm 0.003)$|⁠. The anti-correlation appears to be driven by star-forming galaxies, with a gradient of |${\Delta [\alpha /\rm {Fe}]}\sim (-0.121\pm 0.015){\lambda _{\, R_{\rm {e}}}^{\rm {\, eo}}}$|⁠ , although a weak relationship persists for the subsample of galaxies for which star formation has been quenched. We take this to be confirmation that disc-dominated galaxies have an extended duration of star formation. At a reference velocity dispersion of 200 km s−1, we estimate an increase in half-mass formation time from ∼0.5 Gyr to ∼1.2 Gyr from low- to high- |$\lambda _{\, R_{\rm {e}}}^{\rm {\, eo}}$| galaxies. Slow rotators do not appear to fit these trends. Their residual α-enhancement is indistinguishable from other galaxies with |${\lambda _{\, R_{\rm {e}}}^{\rm {\, eo}}}\lessapprox 0.4$|⁠ , despite being both larger and more massive. This result shows that galaxies with |${\lambda _{\, R_{\rm {e}}}^{\rm {\, eo}}}\lessapprox 0.4$| experience a similar range of star formation histories, despite their different physical structure and angular momentum. [ABSTRACT FROM AUTHOR]

Published
2022
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70. The SAMI Galaxy Survey: stellar population and structural trends across the Fundamental Plane

Author

D’Eugenio, Francesco, primary, Colless, Matthew, additional, Scott, Nicholas, additional, van der Wel, Arjen, additional, Davies, Roger L, additional, van de Sande, Jesse, additional, Sweet, Sarah M, additional, Oh, Sree, additional, Groves, Brent, additional, Sharp, Rob, additional, Owers, Matt S, additional, Bland-Hawthorn, Joss, additional, Croom, Scott M, additional, Brough, Sarah, additional, Bryant, Julia J, additional, Goodwin, Michael, additional, Lawrence, Jon S, additional, Lorente, Nuria P F, additional, and Richards, Samuel N, additional

Published
2021
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71. The first multi-baseline and multi-band, photonic nuller at the Subaru telescope: the GLINT nulling interferometer

Author

Tuthill, Peter G., Mérand, Antoine, Sallum, Stephanie, Martinod, Marc-Antoine, Norris, Barnaby, Lagadec, Tiphaine, Jovanovic, Nemanja, Cvetojevic, Nick, Gross, Simon, Arriola, Alexander, Gretzinger, Thomas, Withford, Michael J., Guyon, Olivier, Lozi, Julien, Lawrence, Jon S., Leon-Saval, Sergio, Tuthill, Peter G., Mérand, Antoine, Sallum, Stephanie, Martinod, Marc-Antoine, Norris, Barnaby, Lagadec, Tiphaine, Jovanovic, Nemanja, Cvetojevic, Nick, Gross, Simon, Arriola, Alexander, Gretzinger, Thomas, Withford, Michael J., Guyon, Olivier, Lozi, Julien, Lawrence, Jon S., and Leon-Saval, Sergio

Abstract

With thousands of confirmed exoplanets, the era of discovery is giving way to that of characterization. Direct imaging is crucial, but extremely difficult due to high star-to-planet contrasts and high angular resolutions. Nulling interferometry, which suppresses contaminating starlight via destructive interference, aims to meet this challenge. A pathfinder of this technique is the GLINT nuller: a 6-baseline, spectrally dispersed pupil-remapping interferometer deployed at the Subaru telescope, in which a single photonic chip performs all the critical optical processes. We present the instrument, novel data processing based on self-calibrating methods, laboratory characterization and the latest on-sky results.

Published
2020

72. The SAMI Galaxy Survey: reconciling strong emission line metallicity diagnostics using metallicity gradients

Author

Poetrodjojo, Henry, primary, Groves, Brent, additional, Kewley, Lisa J, additional, Sweet, Sarah M, additional, Sanchez, Sebastian F, additional, Medling, Anne M, additional, López-Sánchez, Ángel R, additional, Brough, Sarah, additional, Cortese, Luca, additional, van de Sande, Jesse, additional, Vaughan, Sam, additional, Richards, Samuel N, additional, Bryant, Julia J, additional, Croom, Scott M, additional, Bland-Hawthorn, Joss, additional, Goodwin, Michael, additional, Lawrence, Jon S, additional, Owers, Matt S, additional, and Scott, Nicholas, additional

Published
2021
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73. The first multi-baseline and multi-band, photonic nuller at the Subaru telescope: the GLINT nulling interferometer

Author

Martinod, Marc-Antoine, primary, Norris, Barnaby, additional, Lagadec, Tiphaine, additional, Jovanovic, Nemanja, additional, Cvetojevic, Nick, additional, Gross, Simon, additional, Arriola, Alexander, additional, Gretzinger, Thomas, additional, Withford, Michael J., additional, Guyon, Olivier, additional, Lozi, Julien, additional, Lawrence, Jon S., additional, Tuthill, Peter G., additional, and Leon-Saval, Sergio, additional

Published
2020
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74. Exceptional astronomical seeing conditions above Dome C in Antarctica

Author

Lawrence, Jon S., Ashley, Michael C. B., Tokovinin, Andrei, and Travouillon, Tony

Subjects
Environmental issues, Science and technology, Zoology and wildlife conservation
Abstract

Author(s): Jon S. Lawrence [1]; Michael C. B. Ashley (corresponding author) [1]; Andrei Tokovinin [2]; Tony Travouillon [1] One of the most important considerations when planning the next generation of [...]

Published
2004
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75. Adaptive-optics performance of Antarctic telescopes

Author

Lawrence, Jon S.

Subjects
Optics -- Research, Telescope -- Research, Astronomy, Physics
Abstract

The performance of natural guide star adaptive-optics systems for telescopes located on the Antarctic plateau is evaluated and compared with adaptive-optics systems operated with the characteristic midlatitude atmosphere found at Mauna Kea. A 2-m telescope with tip-tilt correction and an 8-m telescope equipped with a high-order adaptive-optics system are considered. Because of the large isoplanatic angle of the South Pole atmosphere, the anisoplanatic error associated with an adaptive-optics correction is negligible, and the achievable resolution is determined only by the fitting error associated with the number of corrected wave-front modes, which depends on the number of actuators on the deformable mirror. The usable field of view of an adaptive-optics equipped Antarctic telescope is thus orders of magnitude larger than for a similar telescope located at a mid-latitude site; this large field of view obviates the necessity for multiconjugate adaptive-optics systems that use multiple laser guide stars. These results, combined with the low infrared sky backgrounds, indicate that the Antarctic plateau is the best site on Earth at which to perform high-resolution imaging with large telescopes, either over large fields of view or with appreciable sky coverage. Preliminary site-testing results obtained recently from the Dome Concordia station indicate that this site is far superior to even the South Pole.

Published
2004

76. SAMI Galaxy Survey: the difference between ionized gas and stellar velocity dispersions.

Author

Oh, Sree, Colless, Matthew, D'Eugenio, Francesco, Croom, Scott M, Cortese, Luca, Groves, Brent, Kewley, Lisa J, van de Sande, Jesse, Zovaro, Henry, Varidel, Mathew R, Barsanti, Stefania, Bland-Hawthorn, Joss, Brough, Sarah, Bryant, Julia J, Casura, Sarah, Lawrence, Jon S, Lorente, Nuria P F, Medling, Anne M, Owers, Matt S, and Yi, Sukyoung K

Subjects
IONIZED gases, ACTIVE galactic nuclei, VELOCITY, GALAXIES, DISPERSION (Chemistry)
Abstract

We investigate the mean locally measured velocity dispersions of ionized gas (σgas) and stars (σ*) for 1090 galaxies with stellar masses |$\log \, (M_{\!\ast }/M_{\odot }) \ge 9.5$| from the SAMI Galaxy Survey. For star-forming galaxies, σ* tends to be larger than σgas, suggesting that stars are in general dynamically hotter than the ionized gas (asymmetric drift). The difference between σgas and σ* (Δσ) correlates with various galaxy properties. We establish that the strongest correlation of Δσ is with beam smearing, which inflates σgas more than σ*, introducing a dependence of Δσ on both the effective radius relative to the point spread function and velocity gradients. The second strongest correlation is with the contribution of active galactic nuclei (AGN) (or evolved stars) to the ionized gas emission, implying that the gas velocity dispersion is strongly affected by the power source. In contrast, using the velocity dispersion measured from integrated spectra (σap) results in less correlation between the aperture-based Δσ (Δσap) and the power source. This suggests that the AGN (or old stars) dynamically heat the gas without causing significant deviations from dynamical equilibrium. Although the variation of Δσap is much smaller than that of Δσ, a correlation between Δσap and gas velocity gradient is still detected, implying that there is a small bias in dynamical masses derived from stellar and ionized gas velocity dispersions. [ABSTRACT FROM AUTHOR]

Published
2022
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77. Nonlinear dynamics of a laser diode with optical feedback systems subject to modulation

Author

Lawrence, Jon S. and Kane, Deb M.

Subjects
Modulators (Electronics) -- Research, Diodes, Laser -- Research, Optoelectronics industry -- Research, Electronics industry -- Research, Laser, Business, Computers, Electronics, Electronics and electrical industries
Abstract

Dynamic and spectral output states of a frequency-modulated diode laser with optical feedback are compared, for direct injection current and electro-optic modulation. A number of different dynamic states are observed, which depend on the ratio of the external cavity frequency to the modulation frequency.

Published
2002

78. The SAMI galaxy survey: a range in S0 properties indicating multiple formation pathways

Author

Deeley, Simon, primary, Drinkwater, Michael J, additional, Sweet, Sarah M, additional, Diaz, Jonathan, additional, Bekki, Kenji, additional, Couch, Warrick J, additional, Forbes, Duncan A, additional, Bland-Hawthorn, Joss, additional, Bryant, Julia J, additional, Croom, Scott, additional, Cortese, Luca, additional, Lawrence, Jon S, additional, Lorente, Nuria, additional, Medling, Anne M, additional, Owers, Matt, additional, Richards, Samuel N, additional, and van de Sande, Jesse, additional

Published
2020
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79. The SAMI Galaxy Survey: Stellar Population Gradients of Central Galaxies

Author

Santucci, Giulia, primary, Brough, Sarah, additional, Scott, Nicholas, additional, Montes, Mireia, additional, Owers, Matt S., additional, van Sande, Jesse, additional, Bland-Hawthorn, Joss, additional, Bryant, Julia J., additional, Croom, Scott M., additional, Ferreras, Ignacio, additional, Lawrence, Jon S., additional, López-Sánchez, Ángel R., additional, and Richards, Samuel N., additional

Published
2020
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80. The SAMI galaxy survey: gas velocity dispersions in low-z star-forming galaxies and the drivers of turbulence

Author

Varidel, Mathew R, primary, Croom, Scott M, primary, Lewis, Geraint F, primary, Fisher, Deanne B, primary, Glazebrook, Karl, primary, Catinella, Barbara, primary, Cortese, Luca, primary, Krumholz, Mark R, primary, Bland-Hawthorn, Joss, primary, Bryant, Julia J, primary, Groves, Brent, primary, Brough, Sarah, primary, Federrath, Christoph, primary, Lawrence, Jon S, primary, Lorente, Nuria P, primary, Owers, Matt S, primary, Richards, Samuel N, primary, López-Sánchez, Ángel R, primary, Sweet, Sarah M, primary, van de Sande, Jesse, primary, and Vaughan, Sam P, primary

Published
2020
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81. The SAMI Galaxy Survey: decomposed stellar kinematics of galaxy bulges and disks

Author

Oh, Sree, primary, Colless, Matthew, primary, Barsanti, Stefania, primary, Casura, Sarah, primary, Cortese, Luca, primary, van de Sande, Jesse, primary, Owers, Matt S, primary, Scott, Nicholas, primary, D’Eugenio, Francesco, primary, Bland-Hawthorn, Joss, primary, Brough, Sarah, primary, Bryant, Julia J, primary, Croom, Scott M, primary, Foster, Caroline, primary, Groves, Brent, primary, Lawrence, Jon S, primary, Richards, Samuel N, primary, and Sweet, Sarah M, primary

Published
2020
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82. PRAXIS: an OH suppression optimised near infrared spectrograph

Author

Ellis, Simon C., primary, Bland-Hawthorn, Joss, additional, Bauer, Svend-Marian, additional, Case, Scott, additional, Content, Robert, additional, Fechner, Thomas, additional, Giannone, Domenico, additional, Haynes, Roger, additional, Hernandez, Eloy, additional, Horton, Anthony J., additional, Klauser, Urs, additional, Lawrence, Jon S., additional, Leon-Saval, Sergio G., additional, Löhmannsröben, Hans-Gerd, additional, Min, Seong-Sik, additional, Pai, Naveen, additional, Roth, Martin M., additional, Waller, Lew G., additional, and Zhelem, Ross, additional

Published
2020
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83. The TAIPAN Starbugs fibre positioner and spectrograph: integration, commissioning, and initial performance

Author

Lorente, Nuria P. F., primary, Birchall, Michael N., additional, Brown, Rebecca A., additional, Case, Scott, additional, Chapman, Steve, additional, Churilov, Vladimir, additional, Farrell, Tony, additional, Fernando, Nuwanthika, additional, Goodwin, Michael, additional, Horton, Anthony J., additional, Klauser, Urs, additional, Kuehn, Kyler, additional, Lawrence, Jon S., additional, Mali, Slavko, additional, McGregor, Helen, additional, Muller, Rolf, additional, Nichani, Vijay, additional, Pai, Naveen, additional, Smedley, Scott, additional, Vuong, Minh V., additional, Waller, Lewis G., additional, and Zhelem, Ross, additional

Published
2020
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84. SAMI Galaxy Survey: trends in [α/Fe] as a function of morphology and environment.

Author

Watson, Peter J, Davies, Roger L, Brough, Sarah, Croom, Scott M, D'Eugenio, Francesco, Glazebrook, Karl, Groves, Brent, López-Sánchez, Ángel R, van de Sande, Jesse, Scott, Nicholas, Vaughan, Sam P, Walcher, Jakob, Bland-Hawthorn, Joss, Bryant, Julia J, Goodwin, Michael, Lawrence, Jon S, Lorente, Nuria P F, Owers, Matt S, and Richards, Samuel

Subjects
ELLIPTICAL galaxies, GALAXIES, STAR formation, GALACTIC evolution, MORPHOLOGY
Abstract

We present a new set of index-based measurements of [α/Fe] for a sample of 2093 galaxies in the SAMI Galaxy Survey. Following earlier work, we fit a global relation between [α/Fe] and the galaxy velocity dispersion σ for red sequence galaxies, |$[\alpha /\text{Fe}]=(0.378\pm 0.009)\rm {log}_{10}\left(\sigma /100\right)+(0.155\pm 0.003)$|⁠. We observe a correlation between the residuals and the local environmental surface density, whereas no such relation exists for blue cloud galaxies. In the full sample, we find that elliptical galaxies in high-density environments are α-enhanced by up to 0.057 ± 0.014 dex at velocity dispersions σ < 100 km s−1, compared with those in low-density environments. This α-enhancement is morphology-dependent, with the offset decreasing along the Hubble sequence towards spirals, which have an offset of 0.019 ± 0.014 dex. At low velocity dispersion and controlling for morphology, we estimate that star formation in high-density environments is truncated ∼1 Gyr earlier than in low-density environments. For elliptical galaxies only, we find support for a parabolic relationship between [α/Fe] and σ, with an environmental α-enhancement of at least 0.03 dex. This suggests strong contributions from both environment and mass-based quenching mechanisms. However, there is no evidence for this behaviour in later morphological types. [ABSTRACT FROM AUTHOR]

Published
2022
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85. Optimal self-calibration and fringe tracking in photonic nulling interferometers using machine learning

Author

Mérand, Antoine, Sallum, Stephanie, Sanchez-Bermudez, Joel, Norris, Barnaby R. M., Martinod, Marc-Antoine, Tuthill, Peter, Gross, Simon, Cvetojevic, Nick, Jovanovic, Nemanja, Lagadec, Tiphaine, Klinner-teo, Teresa, Guyon, Olivier, Lozi, Julien, Deo, Vincent, Vievard, Sébastien, Arriola, Alex, Gretzinger, Thomas, Lawrence, Jon S., and Withford, Michael J.

Published
2022
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86. Achromatic nulling interferometry and fringe tracking with 3D-photonic tricouplers with GLINT

Author

Mérand, Antoine, Sallum, Stephanie, Sanchez-Bermudez, Joel, Martinod, Marc-Antoine, Klinner-Teo, Teresa, Tuthill, Peter, Gross, Simon, Arcadi, Elizabeth, Douglass, Glen, Webb, Jacinda, Norris, Barnaby, Guyon, Olivier, Lozi, Julien, Lagadec, Tiphaine, Jovanovic, Nemanja, Cvetojevic, Nick, Arriola, Alexander, Gretzinger, Thomas, Withford, Michael J., Lawrence, Jon S., and Leon-Saval, Sergio

Published
2022
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87. Where is the Best Site on Earth? Domes A, B, C, and F, and Ridges A and B

Author

Suanders, Will, Lawrence, Jon S, Storey, John W. V, Ashley, Michael C. B, Kato, Seiji, Minnis, Patrick, Winker, David M, Liu, Guiping, and Kulesa, Craig

Subjects
Astronomy
Abstract

The Antarctic plateau contains the best sites on earth for many forms of astronomy, but none of the existing bases were selected with astronomy as the primary motivation. In this paper, we try to systematically compare the merits of potential observatory sites. We include South Pole, Domes A, C and F, and also Ridge B (running NE from Dome A), and what we call Ridge A (running SW from Dome A). Our analysis combines satellite data, published results and atmospheric models, to compare the boundary layer, weather, free atmosphere, sky brightness, pecipitable water vapour, and surface temperature at each site. We find that all Antarctic sites are likely compromised for optical work by airglow and aurorae. Of the sites with existing bases, Dome A is the best overall; but we find that Ridge A offers an even better site. We also find that Dome F is a remarkably good site. Dome C is less good as a thermal infrared or terahertz site, but would be able to take advantage of a predicted OH hole over Antarctica during Spring.

Published
2009

88. First on-sky demonstration of an integrated-photonic nulling interferometer: the GLINT instrument

Author

Norris, Barnaby R M, primary, Cvetojevic, Nick, additional, Lagadec, Tiphaine, additional, Jovanovic, Nemanja, additional, Gross, Simon, additional, Arriola, Alexander, additional, Gretzinger, Thomas, additional, Martinod, Marc-Antoine, additional, Guyon, Olivier, additional, Lozi, Julien, additional, Withford, Michael J, additional, Lawrence, Jon S, additional, and Tuthill, Peter, additional

Published
2019
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89. The SAMI Galaxy Survey: rules of behaviour for spin-ellipticity radial tracks in galaxies

Author

Rawlings, Alexander, primary, Foster, Caroline, additional, van de Sande, Jesse, additional, Taranu, Dan S, additional, Croom, Scott M, additional, Bland-Hawthorn, Joss, additional, Brough, Sarah, additional, Bryant, Julia J, additional, Colless, Matthew, additional, Lagos, Claudia del P, additional, Konstantopoulos, Iraklis S, additional, Lawrence, Jon S, additional, López-Sánchez, Ángel R, additional, Lorente, Nuria P F, additional, Medling, Anne M, additional, Oh, Sree, additional, Owers, Matt S, additional, Richards, Samuel N, additional, Scott, Nicholas, additional, Sweet, Sarah M, additional, and Yi, Sukyoung K, additional

Published
2019
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90. Star-forming, rotating spheroidal galaxies in the GAMA and SAMI surveys

Author

Moffett, Amanda J, primary, Phillipps, Steven, additional, Robotham, Aaron S G, additional, Driver, Simon P, additional, Bremer, Malcolm N, additional, Cortese, Luca, additional, Wong, O Ivy, additional, Brough, Sarah, additional, Brown, Michael J I, additional, Bryant, Julia J, additional, Conselice, Christopher J, additional, Croom, Scott M, additional, George, Koshy, additional, Goldstein, Greg, additional, Goodwin, Michael, additional, Holwerda, Benne W, additional, Hopkins, Andrew M, additional, Konstantopoulos, Iraklis S, additional, Lawrence, Jon S, additional, Lorente, Nuria P F, additional, Medling, Anne M, additional, Owers, Matt S, additional, Pimbblet, Kevin A, additional, Richards, Samuel N, additional, Sweet, Sarah M, additional, and van de Sande, Jesse, additional

Published
2019
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91. The SAMI galaxy survey: stellar population radial gradients in early-type galaxies

Author

Ferreras, Ignacio, primary, Scott, Nicholas, additional, La Barbera, Francesco, additional, Croom, Scott, additional, van de Sande, Jesse, additional, Hopkins, Andrew, additional, Colless, Matthew, additional, Barone, Tania M, additional, d’Eugenio, Francesco, additional, Bland-Hawthorn, Joss, additional, Brough, Sarah, additional, Bryant, Julia J, additional, Konstantopoulos, Iraklis S, additional, Lagos, Claudia, additional, Lawrence, Jon S, additional, López-Sánchez, Angel, additional, Medling, Anne M, additional, Owers, Matt S, additional, and Richards, Samuel N, additional

Published
2019
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92. The SAMI Galaxy Survey: Bayesian inference for gas disc kinematics using a hierarchical Gaussian mixture model

Author

Varidel, Mathew R, primary, Croom, Scott M, primary, Lewis, Geraint F, primary, Brewer, Brendon J, primary, Di Teodoro, Enrico M, primary, Bland-Hawthorn, Joss, primary, Bryant, Julia J, primary, Federrath, Christoph, primary, Foster, Caroline, primary, Glazebrook, Karl, primary, Goodwin, Michael, primary, Groves, Brent, primary, Hopkins, Andrew M, primary, Lawrence, Jon S, primary, López-Sánchez, Ángel R, primary, Medling, Anne M, primary, Owers, Matt S, primary, Richards, Samuel N, primary, Scalzo, Richard, primary, Scott, Nicholas, primary, Sweet, Sarah M, primary, Taranu, Dan S, primary, and van de Sande, Jesse, primary

Published
2019
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93. The SAMI Galaxy Survey: comparing 3D spectroscopic observations with galaxies from cosmological hydrodynamical simulations

Author

van de Sande, Jesse, primary, Lagos, Claudia D P, additional, Welker, Charlotte, additional, Bland-Hawthorn, Joss, additional, Schulze, Felix, additional, Remus, Rhea-Silvia, additional, Bahé, Yannick, additional, Brough, Sarah, additional, Bryant, Julia J, additional, Cortese, Luca, additional, Croom, Scott M, additional, Devriendt, Julien, additional, Dubois, Yohan, additional, Goodwin, Michael, additional, Konstantopoulos, Iraklis S, additional, Lawrence, Jon S, additional, Medling, Anne M, additional, Pichon, Christophe, additional, Richards, Samuel N, additional, Sanchez, Sebastian F, additional, Scott, Nicholas, additional, and Sweet, Sarah M, additional

Published
2018
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94. First on-sky demonstration of an integrated-photonic nulling interferometer: the GLINT instrument.

Author

Norris, Barnaby R M, Cvetojevic, Nick, Lagadec, Tiphaine, Jovanovic, Nemanja, Gross, Simon, Arriola, Alexander, Gretzinger, Thomas, Martinod, Marc-Antoine, Guyon, Olivier, Lozi, Julien, Withford, Michael J, Lawrence, Jon S, and Tuthill, Peter

Subjects
INTERFEROMETERS, ATMOSPHERIC composition, ORIGIN of planets, SPECKLE interferometry, TELESCOPES, INTERFEROMETRY, EXTRASOLAR planets
Abstract

The characterization of exoplanets is critical to understanding planet diversity and formation, their atmospheric composition, and the potential for life. This endeavour is greatly enhanced when light from the planet can be spatially separated from that of the host star. One potential method is nulling interferometry, where the contaminating starlight is removed via destructive interference. The GLINT instrument is a photonic nulling interferometer with novel capabilities that has now been demonstrated in on-sky testing. The instrument fragments the telescope pupil into sub-apertures that are injected into waveguides within a single-mode photonic chip. Here, all requisite beam splitting, routing, and recombination are performed using integrated photonic components. We describe the design, construction, and laboratory testing of our GLINT pathfinder instrument. We then demonstrate the efficacy of this method on sky at the Subaru Telescope, achieving a null-depth precision on sky of ∼10−4 and successfully determining the angular diameter of stars (via their null-depth measurements) to milliarcsecond accuracy. A statistical method for analysing such data is described, along with an outline of the next steps required to deploy this technique for cutting-edge science. [ABSTRACT FROM AUTHOR]

Published
2020
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95. The SAMI Galaxy Survey: rules of behaviour for spin-ellipticity radial tracks in galaxies.

Author

Rawlings, Alexander, Foster, Caroline, van de Sande, Jesse, Taranu, Dan S, Croom, Scott M, Bland-Hawthorn, Joss, Brough, Sarah, Bryant, Julia J, Colless, Matthew, Lagos, Claudia del P, Konstantopoulos, Iraklis S, Lawrence, Jon S, López-Sánchez, Ángel R, Lorente, Nuria P F, Medling, Anne M, Oh, Sree, Owers, Matt S, Richards, Samuel N, Scott, Nicholas, and Sweet, Sarah M

Subjects
GALAXIES, CLASSIFICATION of galaxies, KINEMATICS, PHOTOMETRY, SPIRAL galaxies, GALACTIC bulges, GALACTIC dynamics
Abstract

We study the behaviour of the spin-ellipticity radial tracks for 507 galaxies from the Sydney AAO Multiobject Integral Field (SAMI) Galaxy Survey with stellar kinematics out to ≥1.5 R e. We advocate for a morpho-dynamical classification of galaxies, relying on spatially resolved photometric and kinematic data. We find the use of spin-ellipticity radial tracks is valuable in identifying substructures within a galaxy, including embedded and counter-rotating discs, that are easily missed in unilateral studies of the photometry alone. Conversely, bars are rarely apparent in the stellar kinematics but are readily identified on images. Consequently, we distinguish the spin-ellipticity radial tracks of seven morpho-dynamical types: elliptical, lenticular, early spiral, late spiral, barred spiral, embedded disc, and 2σ galaxies. The importance of probing beyond the inner radii of galaxies is highlighted by the characteristics of galactic features in the spin-ellipticity radial tracks present at larger radii. The density of information presented through spin-ellipticity radial tracks emphasizes a clear advantage to representing galaxies as a track, rather than a single point, in spin-ellipticity parameter space. [ABSTRACT FROM AUTHOR]

Published
2020
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97. The SAMI Galaxy Survey: Spatially resolved metallicity and ionization mapping

Author

Poetrodjojo, Henry, primary, Groves, Brent, additional, Kewley, Lisa J, additional, Medling, Anne M, additional, Sweet, Sarah M, additional, van de Sande, Jesse, additional, Sanchez, Sebastian F, additional, Bland-Hawthorn, Joss, additional, Brough, Sarah, additional, Bryant, Julia J, additional, Cortese, Luca, additional, Croom, Scott M, additional, López-Sánchez, Ángel R, additional, Richards, Samuel N, additional, Zafar, Tayyaba, additional, Lawrence, Jon S, additional, Lorente, Nuria P F, additional, Owers, Matt S, additional, and Scott, Nicholas, additional

Published
2018
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98. A relation between the characteristic stellar ages of galaxies and their intrinsic shapes

Author

van de Sande, Jesse, primary, Scott, Nicholas, additional, Bland-Hawthorn, Joss, additional, Brough, Sarah, additional, Bryant, Julia J., additional, Colless, Matthew, additional, Cortese, Luca, additional, Croom, Scott M., additional, d′Eugenio, Francesco, additional, Foster, Caroline, additional, Goodwin, Michael, additional, Konstantopoulos, Iraklis S., additional, Lawrence, Jon S., additional, McDermid, Richard M., additional, Medling, Anne M., additional, Owers, Matt S., additional, Richards, Samuel N., additional, and Sharp, Rob, additional

Published
2018
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99. The SAMI Galaxy Survey: Gravitational Potential and Surface Density Drive Stellar Populations. I. Early-type Galaxies

Author

Barone, Tania M., primary, D’Eugenio, Francesco, additional, Colless, Matthew, additional, Scott, Nicholas, additional, Sande, Jesse van de, additional, Bland-Hawthorn, Joss, additional, Brough, Sarah, additional, Bryant, Julia J., additional, Cortese, Luca, additional, Croom, Scott M., additional, Foster, Caroline, additional, Goodwin, Michael, additional, Konstantopoulos, Iraklis S., additional, Lawrence, Jon S., additional, Lorente, Nuria P. F., additional, Medling, Anne M., additional, Owers, Matt S., additional, and Richards, Samuel N., additional

Published
2018
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100. The SAMI Galaxy Survey: global stellar populations on the size–mass plane

Author

Scott, Nicholas, primary, Brough, S., additional, Croom, Scott M., additional, Davies, Roger L., additional, van de Sande, Jesse, additional, Allen, J. T., additional, Bland-Hawthorn, Joss, additional, Bryant, Julia J., additional, Cortese, Luca, additional, D'Eugenio, Francesco, additional, Federrath, Christoph, additional, Ferreras, Ignacio, additional, Goodwin, Michael, additional, Groves, Brent, additional, Konstantopoulos, Iraklis, additional, Lawrence, Jon S., additional, Medling, Anne M., additional, Moffett, Amanda J., additional, Owers, Matt S., additional, Richards, Samuel, additional, Robotham, A. S. G., additional, Tonini, Chiara, additional, and Yi, Sukyoung K., additional

Published
2017
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