M. S. Owers
A5074327882- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Astrophysics and Star Formation Studies
- Gamma-ray bursts and supernovae
- Astrophysical Phenomena and Observations
- Astronomical Observations and Instrumentation
- Plant Water Relations and Carbon Dynamics
- Astrophysics and Cosmic Phenomena
- Radio Astronomy Observations and Technology
- Remote Sensing in Agriculture
- Adaptive optics and wavefront sensing
- Scientific Research and Discoveries
- Cosmology and Gravitation Theories
- Geophysics and Gravity Measurements
- Pulsars and Gravitational Waves Research
- Spectroscopy and Laser Applications
- Advanced Vision and Imaging
- CCD and CMOS Imaging Sensors
- Atmospheric Ozone and Climate
- Impact of Light on Environment and Health
- Astro and Planetary Science
- Blind Source Separation Techniques
- Space Science and Extraterrestrial Life
- Historical and Architectural Studies
Macquarie University
2015-2024
ASTRO-3D
2020-2024
ARC Centre of Excellence for All-sky Astrophysics
2017-2024
West Africa Vocational Education
2019
Christ University
2019
Australian Astronomical Observatory
2012-2018
University of Hull
2017
Australian Research Council
2012-2013
Swinburne University of Technology
2009-2012
UNSW Sydney
2005-2009
The Galaxy And Mass Assembly (GAMA) survey is one of the largest contemporary spectroscopic surveys low redshift galaxies. Covering an area ∼286 deg2 (split among five regions) down to a limiting magnitude r < 19.8 mag, we have collected spectra and reliable redshifts for 238 000 objects using AAOmega spectrograph on Anglo-Australian Telescope. In addition, assembled imaging data from number independent in order generate photometry spanning wavelength range 1 nm–1 m. Here, report recently...
The SAMI Galaxy Survey will observe 3400 galaxies with the Sydney-AAO Multi-object Integral-field spectrograph (SAMI) on Anglo-Australian Telescope (AAT) in a 3-year survey which began 2013. We present throughput of system, science basis and specifications for target selection, observation plan combined properties selected galaxies. includes four volume limited galaxy samples based cuts proxy stellar mass, along low-stellar mass dwarf all from And Mass Assembly (GAMA) survey. GAMA regions...
Abstract GAs Stripping Phenomena in galaxies with MUSE (GASP) is a new integral-field spectroscopic survey at the VLT aimed studying gas removal processes galaxies. We present an overview of and show first example galaxy undergoing strong stripping. GASP obtaining deep data for 114 z = 0.04–0.07 stellar masses range <?CDATA ${10}^{9.2}\mbox{--}{10}^{11.5}\,{M}_{\odot }$?> different environments (galaxy clusters groups over more than four orders magnitude halo mass). targets optical...
We describe data release 3 (DR3) of the Galaxy And Mass Assembly (GAMA) survey. The GAMA survey is a spectroscopic redshift and multi-wavelength photometric in three equatorial regions each 60.0 deg^2 (G09, G12, G15), two southern 55.7 (G02) 50.6 (G23). DR3 consists of: first covering G02 region on H-ATLAS sources regions; updates to released DR2. includes 154809 with secure redshifts across four regions. A subset 95.5% complete r<19.8 over an area 19.5 deg^2, 20086 galaxy redshifts, that...
In Galaxy And Mass Assembly Data Release 4 (GAMA DR4), we make available our full spectroscopic redshift sample. This includes 248682 galaxy spectra, and, in combination with earlier surveys, results 330542 redshifts across five sky regions covering ~250deg^2. The density, is the highest over such a sustained area, has exceptionally high completeness (95 per cent to r_KIDS=19.65mag), and well suited for study of mergers, groups, low (z<0.25) population. DR4 32 value-added tables or...
The Galaxy And Mass Assembly (GAMA) survey is a multiwavelength photometric and spectroscopic survey, using the AAOmega spectrograph on Anglo-Australian Telescope to obtain spectra for up ∼300 000 galaxies over 280 deg2, limiting magnitude of rpet < 19.8 mag. target are distributed 0 z ≲ 0.5 with median redshift ≈ 0.2, although distribution includes small number systems, primarily quasars, at higher redshifts, beyond = 1. accuracy ranges from σv 50 km s−1 100 depending signal-to-noise ratio...
We demonstrate the feasibility and potential of using large integral field spectroscopic surveys to investigate prevalence galactic-scale outflows in local Universe. Using data from Sydney-AAO Multi-object Integral spectrograph (SAMI) Wide Field Spectrograph, we study nature an isolated disc galaxy, SDSS J090005.05+000446.7 (z = 0.053 86). In sets, galaxy presents skewed line profiles changing with position galaxy. The are caused by different kinematic components overlapping line-of-sight...
We investigate the relationship between stellar and gas specific angular momentum $j$, mass $M_{*}$ optical morphology for a sample of 488 galaxies extracted from SAMI Galaxy Survey. find that measured within one effective radius, monotonically increases with that, $M_{*}>$10$^{9.5}$ M$_{\odot}$, scatter in this relation strongly correlates (i.e., visual classification S\'ersic index). These findings confirm massive all types lie on plane relating mass, light distribution, suggest...
We present the Early Data Release of Sydney-AAO Multi-object Integral field spectrograph (SAMI) Galaxy Survey. The SAMI Survey is an ongoing integral spectroscopic survey ~3400 low-redshift (z<0.12) galaxies, covering galaxies in and groups within And Mass Assembly (GAMA) regions, a sample clusters. In Release, we publicly release fully calibrated datacubes for representative selection 107 drawn from GAMA along with information about these catalogues. All can be downloaded individually or as...
The Galaxy And Mass Assembly (GAMA) survey furnishes a deep redshift catalog that, when combined with the Wide-field Infrared Explorer ($WISE$), allows us to explore for first time mid-infrared properties of $> 110, 000$ galaxies over 120 deg$^2$ $z\simeq 0.5$. In this paper we detail procedure producing matched GAMA-$WISE$ G12 and G15 fields, in particular characterising measuring resolved sources; complete catalogs all three GAMA equatorial fields will be made available through public...
We use a highly complete subset of the Galaxy And Mass Assembly II (GAMA-II) redshift sample to fully describe stellar mass dependence close pairs and mergers between 108 1012 M⊙. Using analytic form this fit we investigate total accreting on more massive galaxies across all ratios. Depending how conservatively select our robust merging systems, fraction companions is 2.0–5.6 per cent. GAMA-II data see no significant evidence for change in pair z = 0.05 0.2. However, find systematically...
Recent cosmological hydrodynamical simulations suggest that integral field spectroscopy can connect the high-order stellar kinematic moments h3 (~skewness) and h4 (~kurtosis) in galaxies to their assembly history. Here, we assess these results by measuring kinematics on a sample of 315 galaxies, without morphological selection, using 2D data from SAMI Galaxy Survey. A proxy for spin parameter ($\lambda_{R_e}$) ellipticity ($\epsilon_e$) are used separate fast slow rotators; there exists good...
We present a meta-analysis of star-formation rate (SFR) indicators in the GAMA survey, producing 12 different SFR metrics and determining SFR-M* relation for each. compare contrast published methods to extract from each indicator, using well-defined local sample morphologically-selected spiral galaxies, which excludes sources potentially have large recent changes their SFR. The are found yield relations with inconsistent slopes normalisations, suggesting differences between calibration...
We present a joint optical/X-ray analysis of the massive galaxy cluster Abell 2744 (z=0.308). Our strong- and weak-lensing within central region cluster, i.e., at R<1Mpc from brightest galaxy, reveals eight substructures, including main core. All these dark-matter halos are detected with significance least 5sigma feature masses ranging 0.5 to 1.4x10^{14}Msun R<150kpc. Merten et al. (2011) Medezinski (2016) substructures also by us. measure slightly higher mass for core component than...
New Chandra X-ray data and extensive optical spectroscopy, obtained with AAOmega on the 3.9 m Anglo-Australian Telescope, are used to study complex merger taking place in galaxy cluster Abell 2744. Combining our spectra from literature provides a catalog of 1237 redshifts for extragalactic objects lying within 15' center. From these, we confirm 343 members projected 3 Mpc positions velocities, identify two major substructures, corresponding remnants subclusters. The new consistent post core...
Measurements of the low-z Hα luminosity function, Φ, have a large dispersion in local number density sources (∼0.5–1 Mpc−3 dex−1), and correspondingly star formation rate (SFRD). The possible causes for these discrepancies include limited volume sampling, biases arising from survey sample selection, different methods correcting dust obscuration active galactic nucleus contamination. Galaxy And Mass Assembly (GAMA) Sloan Digital Sky Survey (SDSS) provide deep spectroscopic observations over...
We identify four rare "jellyfish" galaxies in Hubble Space Telescope imagery of the major merger cluster Abell 2744. These harbor trails star-forming knots and filaments which have formed in-situ gas tails stripped from parent galaxies, indicating they are process being transformed by environment. Further evidence for rapid transformation these comes their optical spectra, reveal starburst, poststarburst AGN features. Most intriguingly, three jellyfish lie near ICM features associated with a...
In the currently debated context of using clusters galaxies as cosmological probes, need for well-defined cluster samples is critical. The XXL Survey has been specifically designed to provide a well characterised sample some 500 X-ray detected suitable studies. main goal present article make public and describe properties catalogue in its state, associated catalogues super-clusters fossil groups. We release containing 365 total. give details follow-up observations explain procedure adopted...
We present a methodology for the regularization and combination of sparse sampled irregularly gridded observations from fibre-optic multiobject integral field spectroscopy. The approach minimizes interpolation retains image resolution on combining subpixel dithered data. discuss in context Sydney–AAO spectrograph (SAMI) Galaxy Survey underway at Anglo-Australian Telescope. SAMI instrument uses 13 fibre bundles to perform high-multiplex spectroscopy across 1° diameter view. is targeting ∼3000...
We present the ∼800 star formation rate maps for Sydney-AAO Multi-object Integral field spectrograph (SAMI) Galaxy Survey based on H α emission maps, corrected dust attenuation via Balmer decrement, that are included in SAMI Public Data Release 1. mask out spaxels contaminated by non-stellar using [O iii]/H β, [N ii]/H α, [S and i]/H line ratios. Using these we examine global resolved star-forming main sequences of galaxies as a function morphology, environmental density, stellar mass....
We have entered a new era where integral-field spectroscopic surveys of galaxies are sufficiently large to adequately sample large-scale structure over cosmologically significant volume. This was the primary design goal SAMI Galaxy Survey. Here, in Data Release 3 (DR3), we release data for full 3068 unique observed. includes cluster 888 first time. For each galaxy, there two spectral cubes covering blue (370-570nm) and red (630-740nm) optical wavelength ranges at resolving power R=1808 4304...
We explore trends in galaxy properties with Mpc-scale structures using catalogues of environment and large-scale structure from the Galaxy And Mass Assembly (GAMA) survey. Existing GAMA structure, group, pair membership allow us to construct stellar mass functions for different environmental types. To avoid simply extracting known underlying correlations between mass, we create a matched sample galaxies masses within 9.5 ≤ log M*/h−2 M⊙ 11 each population. Using these samples, show that...
We analyse the velocity dispersion properties of 472 z ∼ 0.9 star-forming galaxies observed as part KMOS Redshift One Spectroscopic Survey (KROSS). The majority this sample is rotationally dominated (83 ± 5 per cent with vC/σ0 > 1) but also dynamically hot and highly turbulent. After correcting for beam smearing effects, median intrinsic final σ0 = 43.2 0.8 km s−1 a rotational to ratio 2.6 0.1. To explore relationship between dispersion, stellar mass, star formation rate, redshift, we...
We describe the selection of galaxies targeted in eight low-redshift clusters (APMCC0917, A168, A4038, EDCC442, A3880, A2399, A119 and A85; 0.029 < z 0.058) as part Sydney-AAO Multi-Object Integral field spectrograph Galaxy Survey (SAMI-GS). have conducted a redshift survey these using AAOmega multi-object on 3.9-m Anglo-Australian Telescope. The is used to determine cluster membership characterize dynamical properties clusters. In combination with existing data, resulted 21 257 reliable...
We present the second major release of data from SAMI Galaxy Survey. Data Release Two includes for 1559 galaxies, about 50% full survey. Galaxies included have a redshift range 0.004 < z 0.113 and large stellar mass 7.5 log (M_star/M_sun) 11.6. The core each galaxy consist two primary spectral cubes covering blue red optical wavelength ranges. For cube we also provide three spatially binned set standardised aperture spectra. product value-added products. This all emission line products One,...