대표연구 논문 실적
Hector Galaxy Survey: Data processing, quality control, and early science
발행년도
2025-1009
저자
Sree Oh, Madusha Gunawardhana, Scott Croom, Gabriella Quattropani, Sujeeporn Tuntipong, Julia Bryant, Pablo Corcho Caballero, Pratyush Kumar Das, O˘guzhan Çakır, Joon Hyeop Lee, A. Ristea, Stefania Barsanti, Mina Pak, Sarah Sweet, Tom Woodrow, Thomas Rutherford, Yifan Mai, Matt Owers, Matthew Colless, Lachlan Stuart, Henry R. M. Zovaro, Sam Vaughan, Jesse van de Sande, Tony Farrell, Minje Beom, Joss J. Bland-Hawthorn, Jiwon Chung, Caroline Foster, Kathryn Grasha, Hyunjin Jeong, Jong Chul Lee, Anilkumar Mailvaganam, Kyuseok Oh, Simon O’Toole, Edward N. Taylor, Tayyaba Zafar, Gurashish Bhatia, David Brodrick, Rebecca Brown, Elton Cheng, Robert Content, Fred Crous, Peter Gillingham, Ellen Houston, Jon Lawrence, Helen McGregor, Mahesh Mohanan, Seong-sik Min, Barnaby Norris, Naveen Pai, Ayoan Sadman, Will Saunders, Adeline Wang, Ross Zhelem, Jessica Zheng
저널
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF AUSTRALIA
작성자
전지현
작성일
2025-12-01
조회
37
Abstract
The Hector Galaxy Survey is a new optical integral field spectroscopy (IFS) survey currently using the Anglo-Australian Telescope to observe up to 15 000 galaxies at low redshift (z<0.1). The Hector instrument employs 21 optical fibre bundles feeding into two double-beam spectrographs, AAOmega and the new Spector spectrograph, to enable wide-field multi-object IFS observations of galaxies. To efficiently process the survey data, we adopt the data reduction pipeline developed for the SAMI Galaxy Survey, with significant updates to accommodate Hector’s dual-spectrograph system. These enhancements address key differences in spectral resolution and other instrumental characteristics relative to SAMI and are specifically optimised for Hector’s unique configuration. We introduce a two-dimensional arc fitting approach that reduces the root-mean-square (RMS) velocity scatter by a factor of 1.2–3.4 compared to fitting arc lines independently for each fibre. The pipeline also incorporates detailed modelling of chromatic optical distortion in the wide-field corrector, to account for wavelength-dependent spatial shifts across the focal plane. We assess data quality through a series of validation tests, including wavelength solution accuracy (1.2–2.7 km s−1 RMS), spectral resolution (FWHM of 1.2–1.4 Å for Spector), throughput characterisation, astrometric precision (≲ 0.03 arcsec median offset), sky subtraction residuals (1–1.6% median continuum residual), and flux calibration stability (4% systematic offset when compared to Legacy Survey fluxes). We demonstrate that Hector delivers high-fidelity, science-ready datasets, supporting robust measurements of galaxy kinematics, stellar populations, and emission-line properties and provide examples. Additionally, we address systematic uncertainties identified during the data processing and propose future improvements to enhance the precision and reliability of upcoming data releases. This work establishes a robust data reduction framework for Hector, delivering high-quality data products that support a broad range of extragalactic studies.
http://dx.doi.org/10.1017/pasa.2025.10106
The Hector Galaxy Survey is a new optical integral field spectroscopy (IFS) survey currently using the Anglo-Australian Telescope to observe up to 15 000 galaxies at low redshift (z<0.1). The Hector instrument employs 21 optical fibre bundles feeding into two double-beam spectrographs, AAOmega and the new Spector spectrograph, to enable wide-field multi-object IFS observations of galaxies. To efficiently process the survey data, we adopt the data reduction pipeline developed for the SAMI Galaxy Survey, with significant updates to accommodate Hector’s dual-spectrograph system. These enhancements address key differences in spectral resolution and other instrumental characteristics relative to SAMI and are specifically optimised for Hector’s unique configuration. We introduce a two-dimensional arc fitting approach that reduces the root-mean-square (RMS) velocity scatter by a factor of 1.2–3.4 compared to fitting arc lines independently for each fibre. The pipeline also incorporates detailed modelling of chromatic optical distortion in the wide-field corrector, to account for wavelength-dependent spatial shifts across the focal plane. We assess data quality through a series of validation tests, including wavelength solution accuracy (1.2–2.7 km s−1 RMS), spectral resolution (FWHM of 1.2–1.4 Å for Spector), throughput characterisation, astrometric precision (≲ 0.03 arcsec median offset), sky subtraction residuals (1–1.6% median continuum residual), and flux calibration stability (4% systematic offset when compared to Legacy Survey fluxes). We demonstrate that Hector delivers high-fidelity, science-ready datasets, supporting robust measurements of galaxy kinematics, stellar populations, and emission-line properties and provide examples. Additionally, we address systematic uncertainties identified during the data processing and propose future improvements to enhance the precision and reliability of upcoming data releases. This work establishes a robust data reduction framework for Hector, delivering high-quality data products that support a broad range of extragalactic studies.
http://dx.doi.org/10.1017/pasa.2025.10106
