Using an artificial neural network to classify multicomponent emission lines with integral field spectroscopy from SAMI and S7

Article

Hampton, E. J., Medling, A. M., Groves, B., Kewley, L., Dopita, M., Davies, R., Ho, I. -T., Kaasinen, M., Leslie, S., Sharp, R., Sweet, S. M., Thomas, A. D., Allen, J., Bland-Hawthorn, J., Brough, S., Bryant, J. J., Croom, S., Goodwin, M., Green, A., ..., Shastri, P.. 2017. "Using an artificial neural network to classify multicomponent emission lines with integral field spectroscopy from SAMI and S7." Monthly Notices of the Royal Astronomical Society. 470 (3), pp. 3395-3416. https://doi.org/10.1093/mnras/stx1413
Article Title

Using an artificial neural network to classify multicomponent emission lines with integral field spectroscopy from SAMI and S7

ERA Journal ID1074
Article CategoryArticle
AuthorsHampton, E. J., Medling, A. M., Groves, B., Kewley, L., Dopita, M., Davies, R., Ho, I. -T., Kaasinen, M., Leslie, S., Sharp, R., Sweet, S. M., Thomas, A. D., Allen, J., Bland-Hawthorn, J., Brough, S., Bryant, J. J., Croom, S., Goodwin, M., Green, A., Konstantantopoulos, I. S., Lawrence, J., Lopez-Sanchez, Á. R., Lorente, N. P. F., McElroy, R., Owers, M. S., Richards, S. N. and Shastri, P.
Journal TitleMonthly Notices of the Royal Astronomical Society
Journal Citation470 (3), pp. 3395-3416
Number of Pages22
Year2017
PublisherOxford University Press
ISSN0035-8711
1365-2966
Digital Object Identifier (DOI)https://doi.org/10.1093/mnras/stx1413
Web Address (URL)https://ui.adsabs.harvard.edu/abs/2017MNRAS.470.3395H
Abstract

Integral field spectroscopy (IFS) surveys are changing how we study galaxies and are creating vastly more spectroscopic data available than before. The large number of resulting spectra makes visual inspection of emission line fits an infeasible option. Here, we present a demonstration of an artificial neural network (ANN) that determines the number of Gaussian components needed to describe the complex emission line velocity structures observed in galaxies after being fit with LZIFU. We apply our ANN to IFS data for the S7 survey, conducted using the Wide Field Spectrograph on the ANU 2.3 m Telescope, and the SAMI Galaxy Survey, conducted using the SAMI instrument on the 4 m Anglo-Australian Telescope. We use the spectral fitting code LZIFU (Ho et al. 2016a) to fit the emission line spectra of individual spaxels from S7 and SAMI data cubes with 1-, 2- and 3-Gaussian components. We demonstrate that using an ANN is comparable to astronomers performing the same visual inspection task of determining the best number of Gaussian components to describe the physical processes in galaxies. The advantage of our ANN is that it is capable of processing the spectra for thousands of galaxies in minutes, as compared to the years this task would take individual astronomers to complete by visual inspection.

Keywordsmethods: data analysis; galaxies: kinematics and dynamics; techniques: imaging spectroscopy; techniques: spectroscopic – galaxies: general
Contains Sensitive ContentDoes not contain sensitive content
ANZSRC Field of Research 2020510102. Astronomical instrumentation
Public Notes

This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society © 2017 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

Byline AffiliationsAustralian National University
California Institute of Technology (Caltech), United States
Max Planck Institute for Extraterrestrial Physics, Germany
ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions, Australia
Swinburne University of Technology
University of Sydney
Australian Astronomical Observatory, Australia
National Innovation Centre, Australia
Macquarie University
Indian Institute of Astrophysics, India
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The SAMI Galaxy Survey: Revisiting Galaxy Classification through High-order Stellar Kinematics
van de Sande, Jesse, Bland-Hawthorn, J., Fogarty, Lisa M. R., Cortese, Luca, d'Eugenio, Francesco, Croom, Scott M., Scott, Nicholas, Allen, James T., Brough, Sarah, Bryant, Julia J., Cecil, Gerald, Colless, Matthew, Couch, Warrick J., Davies, Roger, Pascal J., Foster, Caroline, Goldstein, Gregory, Goodwin, Michael, Groves, Brent, ..., Yi, Sukyoung K.. 2017. "The SAMI Galaxy Survey: Revisiting Galaxy Classification through High-order Stellar Kinematics." The Astrophysical Journal: an international review of astronomy and astronomical physics. 835 (1). https://doi.org/10.3847/1538-4357/835/1/104
Investigating the host galaxies of luminous AGN in the local universe with integral field spectroscopy
McElroy, Rebecca, Croom, Scott and Husemann, Bernd. 2017. "Investigating the host galaxies of luminous AGN in the local universe with integral field spectroscopy." 229th American Astronomical Society Meeting (AAS Meeting). Grapevine, Texas, United States 03 - 07 Jan 2017 United States.
The Close AGN Reference Survey (CARS)
Husemann, Bernd, Tremblay, Grant, Davis, Timothy, Busch, Gerold, McElroy, Rebecca, Neumann, Justus, Urrutia, Tanya, Krumpe, Mirko, Scharwächter, Julia, Powell, Meredith, Pérez-Torres, Miguel Perez-Torres and CARS Team. 2017. "The Close AGN Reference Survey (CARS)." The Messenger. 169, pp. 42-47. https://doi.org/10.18727/0722-6691/5038
The Close AGN Reference Survey (CARS). Mrk 1018 halts dimming and experiences strong short-term variability
Krumpe, M., Husemann, B., Tremblay, G.R., Urrutia, T., Powell, M., Davis, T.A., Scharwächter, J., Dexter, J., Busch, G., Combes, F., Croom, S. M., Eckart, A., McElroy, R. E., Pérez-Torres, M. and Leung, G.. 2017. "The Close AGN Reference Survey (CARS). Mrk 1018 halts dimming and experiences strong short-term variability." Astronomy and Astrophysics: a European journal. 607. https://doi.org/10.1051/0004-6361/201731967
The SAMI Galaxy Survey: the low-redshift stellar mass Tully-Fisher relation
Bloom, J. V., Croom, S. M., Bryant, J. J., Callingham, J. R., Schaefer, A. L., Cortese, L., Hopkins, A. M., D'Eugenio, F., Scott, N., Glazebrook, K., Tonini, C., McElroy, R. E., Clark, H.A., Catinella, B., Allen, J.T., Bland-Hawthorn, J., Goodwin, M., Green, A.W., Konstantopoulos, I.S., ..., Sharp, R.. 2017. "The SAMI Galaxy Survey: the low-redshift stellar mass Tully-Fisher relation." Monthly Notices of the Royal Astronomical Society. 472 (2), pp. 1809-1824. https://doi.org/10.1093/mnras/stx1701
The Taipan Galaxy Survey: Scientific Goals and Observing Strategy
da Cunha, Elisabete, Hopkins, Andrew M., Colless, Matthew, Taylor, Edward N., Blake, Chris, Howlett, Cullan, Magoulas, Christina, Lucey, John R., Lagos, Claudia, Kuehn, Kyler, Gordon, Yjan, Barat, Dilyar, Bian, Fuyan, Wolf, Christian, Cowley, Michael J., White, Marc, Achitouv, Ixandra, Bilicki, Maciej, Bland-Hawthorn, Joss, ..., Watson, Fred. 2017. "The Taipan Galaxy Survey: Scientific Goals and Observing Strategy." Publications of the Astronomical Society of Australia. 34, pp. 1-28. https://doi.org/10.1017/pasa.2017.41
Zfire: Similar stellar growth in hα-emitting cluster and field galaxies at z ∼ 2
Tran, Kim-Vy H., Alcorn, Leo Y., Kacprzak, Glenn G., Nanayakkara, Themiya, Straatman, Caroline, Yuan, Tiantian, Cowley, Michael, Davé, Romeel, Glazebrook, Karl, Kewley, Lisa J., Labbé, Ivo, Martizzi, Davidé, Papovich, Casey, Quadri, Ryan, Spitler, Lee R. and Tomczak, Adam. 2017. "Zfire: Similar stellar growth in hα-emitting cluster and field galaxies at z ∼ 2." The Astrophysical Journal: an international review of astronomy and astronomical physics. 834 (2), pp. 1-14. https://doi.org/10.3847/1538-4357/834/2/101
ZFIRE: The Evolution of the Stellar Mass Tully–Fisher Relation to Redshift ∼2.2
Straatman, Caroline M. S., Glazebrook, Karl, Kacprzak, Glenn G., Labbé, Ivo, Nanayakkara, Themiya, Alcorn, Leo, Cowley, Michael, Kewley, Lisa J., Spitler, Lee R., Tran, Kim-Vy H. and Yuan, Tiantian. 2017. "ZFIRE: The Evolution of the Stellar Mass Tully–Fisher Relation to Redshift ∼2.2." The Astrophysical Journal: an international review of astronomy and astronomical physics. 839 (1), pp. 1-20. https://doi.org/10.3847/1538-4357/aa643e
ZFIRE: using Hα equivalent widths to investigate the in situ initial mass function at z ∼ 2
Nanayakkara, Themiya, Glazebrook, Karl, Kacprzak, Glenn G., Yuan, Tiantian, Fisher, David, Tran, Kim-Vy, Kewley, Lisa J., Spitler, Lee, Alcorn, Lee, Cowley, Michael, Labbe, Ivo, Straatman, Caroline and Tomczak, Adam. 2017. "ZFIRE: using Hα equivalent widths to investigate the in situ initial mass function at z ∼ 2." Monthly Notices of the Royal Astronomical Society. 468 (3), pp. 3071-3108. https://doi.org/10.1093/mnras/stx605
Host galaxies of luminous type II AGN: Winds, shocks, and comparisons to The SAMI Galaxy Survey
McElroy, Rebecca, Croom, Scott and Pracy, Michael. 2016. "Host galaxies of luminous type II AGN: Winds, shocks, and comparisons to The SAMI Galaxy Survey." 227th American Astronomical Society Meeting. Kissimmee, FL, United States 04 - 08 Jan 2016 United States.
The Close AGN Reference Survey (CARS). Mrk 1018 returns to the shadows after 30 years as a Seyfert 1
McElroy, R. E., Husemann, B., Croom, S., Davis, T.A., Bennert, V., Busch, G., Combes, F., Eckart, A., Pérez-Torres, M., Powell, M., Scharwächter, J., Tremblay, G.R. and Urrutia, T.. 2016. "The Close AGN Reference Survey (CARS). Mrk 1018 returns to the shadows after 30 years as a Seyfert 1." Astronomy and Astrophysics: a European journal. 593, p. L8. https://doi.org/10.1051/0004-6361/201629102
The Close AGN Reference Survey (CARS). What is causing Mrk 1018's return to the shadows after 30 years?
Husemann, B., Urrutia, T., Tremblay, G.R., Krumpe, M., Dexter, J., Busch, G., Combes, F., Croom, S. M., Davis, T.A., Eckart, A., McElroy, R. E., Pérez-Torres, M., Powell, T.M. and Scharwächter, J.. 2016. "The Close AGN Reference Survey (CARS). What is causing Mrk 1018's return to the shadows after 30 years?" Astronomy and Astrophysics: a European journal. 593, p. L9. https://doi.org/10.1051/0004-6361/201629245
Z-FIRE: ISM Properties of the z = 2.095 Cosmos Cluster
Kewley, Lisa J., Yuan, Tiantian, Nanayakkara, Themiya, Kacprzak, Glenn G., Tran, Kim-Vy H., Glazebrook, Karl, Spitler, Lee, Cowley, Michael, Dopita, Michael, Straatman, Caroline, Labbé, Ivo and Tomczak, Adam. 2016. "Z-FIRE: ISM Properties of the z = 2.095 Cosmos Cluster." The Astrophysical Journal: an international review of astronomy and astronomical physics. 819 (2), pp. 1-10. https://doi.org/10.3847/0004-637X/819/2/100
ZFIRE: The kinematics of star-forming galaxies as a function of environment at z ∼ 2
Alcorn, Leo Y., Tran, Kim-Vy H., Kacprzak, Glenn G., Nanayakkara, Themiya, Straatman, Caroline, Yuan, Tiantian, Allen, Rebecca J., Cowley, Michael, Davé, Romeel, Glazebrook, Karl, Kewley, Lisa J., Labbé, Ivo, Quadri, Ryan, Spitler, Lee R. and Tomczak, Adam. 2016. "ZFIRE: The kinematics of star-forming galaxies as a function of environment at z ∼ 2." The Astrophysical Journal Letters. 825 (1), pp. 1-6. https://doi.org/10.3847/2041-8205/825/1/L2
ZFIRE: A Keck/Mosfire Spectroscopic Survey of Galaxies in Rich Environments at z ∼ 2
Nanayakkara, Themiya, Glazebrook, Karl, Kacprzak, Glenn G., Yuan, Tiantian, Tran, Kim-Vy, Spitler, Lee, Kewley, Lisa, Straatman, Caroline, Cowley, Michael, Fisher, David, Labbe, Ivo, Tomczak, Adam, Allen, Rebecca and Alcorn, Leo. 2016. "ZFIRE: A Keck/Mosfire Spectroscopic Survey of Galaxies in Rich Environments at z ∼ 2." The Astrophysical Journal: an international review of astronomy and astronomical physics. 828 (1), pp. 1-26. https://doi.org/10.3847/0004-637X/828/1/21
IFU observations of luminous type II AGN - I. Evidence for ubiquitous winds
McElroy, Rebecca, Croom, Scott M., Pracy, Michael, Sharp, Rob, Ho, I-Ting and Medling, Anne M.. 2015. "IFU observations of luminous type II AGN - I. Evidence for ubiquitous winds." Monthly Notices of the Royal Astronomical Society. 446 (2), pp. 2186-2204. https://doi.org/10.1093/mnras/stu2224
The SAMI Galaxy Survey: cubism and covariance, putting round pegs into square holes
Sharp, R., Allen, J. T., Fogarty, L. M. R., Croom, S. M., Cortese, L., Green, A. W., Nielsen, J., Richards, S. N., Scott, N., Taylor, E. N., Barnes, L. A., Barnes, A. E., Birchall, M., Bland-Hawthorn, J., Bloom, J. V., Brough, S., Bryant, J. J., Cecil, G. N., Colless, M., ..., Walcher, C. J.. 2015. "The SAMI Galaxy Survey: cubism and covariance, putting round pegs into square holes." Monthly Notices of the Royal Astronomical Society. 446 (2), pp. 1551-1566. https://doi.org/10.1093/mnras/stu2055
The SAMI Galaxy Survey: Early Data Release
Allen, J. T., Croom, S. M., Konstantopoulos, I. S., Bryant, J. J., Sharp, R., Cecil, G. N., Fogarty, L. M. R., Foster, C., Green, A. W., Ho, I. -T., Owers, M. S., Schaefer, A. L., Scott, N., Bauer, A. E., Baldry, I., Barnes, L. A., Bland-Hawthorn, J., Bloom, J. V., Brough, S., ..., Walcher, C. J.. 2015. "The SAMI Galaxy Survey: Early Data Release." Monthly Notices of the Royal Astronomical Society. 446 (2), pp. 1567-1583. https://doi.org/10.1093/mnras/stu2057
The SAMI Galaxy Survey: instrument specification and target selection
Bryant, J. J., Owers, M. S., Robotham, A. S. G., Croom, S. M., Driver, S. P., Drinkwater, M. J., Lorente, N. P. F., Cortese, L., Scott, N., Colless, M., Schaefer, A., Taylor, E. N., Konstantopoulos, I. S., Allen, J. T., Baldry, I., Barnes, L., Bauer, A. E., Bland-Hawthorn, J., Bloom, J. V., ..., Walcher, C. J.. 2015. "The SAMI Galaxy Survey: instrument specification and target selection." Monthly Notices of the Royal Astronomical Society. 447 (3), pp. 2857-2879. https://doi.org/10.1093/mnras/stu2635
Spectroscopic observations of sn 2012fr: A luminous, normal type Ia supernova with early high-velocity features and a late velocity plateau
Childress, M.J., Scalzo, R.A., Sim, S.A., Tucker, B.E., Yuan, F., Schmidt, B.P., Cenko, S.B., Silverman, J.M., Contreras, C., Hsiao, E.Y., Phillips, M., Morrell, N., Jha, S.W., McCully, C., Filippenko, A.V., Anderson, J.P., Benetti, S., Bufano, F., de Jaeger, T., ..., Zhou, G.. 2013. "Spectroscopic observations of sn 2012fr: A luminous, normal type Ia supernova with early high-velocity features and a late velocity plateau." The Astrophysical Journal: an international review of astronomy and astronomical physics. 770 (1), pp. 1-20. https://doi.org/10.1093/mnras/stt813
The 6dF Galaxy Survey: Final redshift release (DR3) and southern large-scale structures
Heath Jones, D., Read, Mike A., Saunders, Will, Colless, Matthew, Jarrett, Tom, Parker, Quentin A., Fairall, Anthony P., Mauch, Thomas, Sadler, Elaine M., Watson, Fred G., Burton, Donna, Campbell, Lachlan A., Cass, Paul, Croom, Scott M., Dawe, John, Fiegert, Kristin, Frankcombe, Leela, Hartley, Malcolm, Huchra, John, ..., Williams, Mary. 2009. "The 6dF Galaxy Survey: Final redshift release (DR3) and southern large-scale structures." Monthly Notices of the Royal Astronomical Society. 399 (2), pp. 683-698. https://doi.org/10.1111/j.1365-2966.2009.15338.x
Controlling evaporation from on-farm storages
Craig, Ian, Schmidt, Erik, Green, Andrew and Scobie, Michael. 2005. "Controlling evaporation from on-farm storages." Irrigation Australia 2005: Irrigation Association of Australia National Conference and Exhibition: Restoring the Balance. Townsville, Australia 17 - 19 May 2005 Hornsby, NSW, Australia.
Controlling evaporation loss from water storages
Craig, Ian, Green, Andrew, Scobie, Michael and Schmidt, Erik. 2005. Controlling evaporation loss from water storages. Toowoomba, Australia. University of Southern Queensland.