S. M. Croom
A5067344624- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Gamma-ray bursts and supernovae
- Astrophysical Phenomena and Observations
- Astronomical Observations and Instrumentation
- Astrophysics and Star Formation Studies
- Astrophysics and Cosmic Phenomena
- Radio Astronomy Observations and Technology
- Adaptive optics and wavefront sensing
- Cosmology and Gravitation Theories
- Plant Water Relations and Carbon Dynamics
- Scientific Research and Discoveries
- Remote Sensing in Agriculture
- Geophysics and Gravity Measurements
- Spectroscopy and Laser Applications
- CCD and CMOS Imaging Sensors
- Pulsars and Gravitational Waves Research
- Particle Accelerators and Free-Electron Lasers
- Dark Matter and Cosmic Phenomena
- Calibration and Measurement Techniques
- Distributed and Parallel Computing Systems
- Geological and Geophysical Studies
- Particle Detector Development and Performance
- Computational Physics and Python Applications
The University of Sydney
2016-2025
ARC Centre of Excellence for All-sky Astrophysics
2016-2025
ASTRO-3D
2018-2024
Australian Astronomical Observatory
2000-2022
Leibniz Institute for Astrophysics Potsdam
2018-2022
Stockholm University
2022
Macquarie University
2022
American Society for Radiation Oncology
2019
UNSW Sydney
2019
Max Planck Institute for Astronomy
2018-2019
The Galaxy And Mass Assembly (GAMA) survey has been operating since February 2008 on the 3.9-m Anglo-Australian Telescope using AAOmega fibre-fed spectrograph facility to acquire spectra with a resolution of R~1300 for 120,862 SDSS selected galaxies. target catalogue constitutes three contiguous equatorial regions centred at 9h (G09), 12h (G12) and 14.5h (G15) each 12 x 4 sq.deg limiting fluxes r < 19.4, 19.8, 19.4 mag respectively (and additional limits other wavelengths). Spectra reliable...
We present measurements of the baryon acoustic peak at redshifts z = 0.44, 0.6 and 0.73 in galaxy correlation function final dataset WiggleZ Dark Energy Survey. combine our with lower-redshift from 6-degree Field Galaxy Survey Sloan Digital Sky Survey, producing a stacked survey which statistical significance detection is 4.9-sigma relative to zero-baryon model no peak. fit cosmological models this combined oscillation (BAO) comprising six distance-redshift data points, compare results...
We report the final redshift release of 6dF Galaxy Survey, a combined and peculiar velocity survey over southern sky (|b|>10 deg). Its 136,304 spectra have yielded 110,256 new extragalactic redshifts catalogue 125,071 galaxies making near-complete samples with (K, H, J, r_F, b_J) <= (12.65, 12.95, 13.75, 15.60, 16.75). The median is 0.053. Survey data, including images, spectra, photometry redshifts, are available through an online database. describe changes to information in database since...
This paper describes the first catalogue of photometrically-derived stellar mass estimates for intermediate-redshift (z < 0.65) galaxies in Galaxy And Mass Assembly (GAMA) spectroscopic redshift survey. These masses, as well full set ancillary population parameters, will be made public part GAMA data release 2. Although database does include NIR photometry, we show that quality our synthesis fits is significantly poorer when these are included. Further, a large fraction galaxies, parameters...
We present the final catalogue of 2dF QSO Redshift Survey (2QZ), based on Anglo-Australian Telescope spectroscopic observations 44576 colour-selected (u b_J r) objects with 18.25<b_J<20.85 selected from APM scans UK Schmidt (UKST) photographic plates. The 2QZ comprises 23338 QSOs, 12292 galactic stars (including 2071 white dwarfs) and 4558 compact narrow-emission-line galaxies. obtained a reliable identification for 86 per cent observed 2dF. also report 6dF (6QZ), UKST 1564 brighter...
We demonstrate a novel technology that combines the power of multi-object spectrograph with spatial multiplex advantage an integral field (IFS). The Sydney-AAO Multi-object IFS (SAMI) is prototype wide-field system at Anglo-Australian Telescope (AAT) allows 13 imaging fibre bundles ("hexabundles") to be deployed over 1-degree diameter view. Each hexabundle comprises 61 lightly-fused multimode fibres reduced cladding and yields 75 percent filling factor. core subtends 1.6 arcseconds on sky...
We perform a joint determination of the distance-redshift relation and cosmic expansion rate at redshifts z = 0.44, 0.6 0.73 by combining measurements baryon acoustic peak Alcock-Paczynski distortion from galaxy clustering in WiggleZ Dark Energy Survey, using large ensemble mock catalogues to calculate covariance between measurements.We find that D A (z) (1205 ± 114, 1380 95, 1534 107) Mpc H(z) (82.6 7.8, 87.9 6.1, 97.3 7.0) km s -1 these three redshifts.Further our results with other...
We present a determination of the optical QSO luminosity function and its cosmological evolution with redshift for sample over 6000 QSOs identified primarily from first observations 2dF Redshift Survey (2QZ). For -26 < M_B -23 0.35 z 2.3, we find that pure (PLE) models provide an acceptable fit to observed dependence function. The is best by two-power-law form. Exponential models, both as look-back time, general second-order polynomial redshift, were found fits dataset comprising 2QZ Large...
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 WiggleZ Dark Energy Survey is a survey of 240,000 emission line galaxies in the distant universe, measured with AAOmega spectrograph on 3.9-m Anglo-Australian Telescope (AAT). target are selected using ultraviolet photometry from GALEX satellite, flux limit NUV<22.8 mag. redshift range containing 90% 0.2<z<1.0. primary aim to precisely measure scale baryon acoustic oscillations (BAO) imprinted spatial distribution these at look-back times 4-8 Gyrs. Detailed forecasts indicate will BAO...
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...
We determine the low-redshift field galaxy stellar mass function (GSMF) using an area of 143 deg^2 from first three years Galaxy And Mass Assembly (GAMA) survey. The magnitude limits this redshift survey are r < 19.4 mag over two thirds and 19.8 one third area. GSMF is determined a sample 5210 galaxies density-corrected maximum volume method. This efficiently overcomes issue fluctuations in number density versus redshift. With H_0 = 70, well described between 10^8 10^11.5 Msun double...
We present precise measurements of the growth rate cosmic structure for redshift range 0.1 < z 0.9, using redshift-space distortions in galaxy power spectrum WiggleZ Dark Energy Survey. Our results, which have a precision around 10 per cent four independent bins, are well fitted by flat Λ cold dark matter (ΛCDM) cosmological model with density parameter Ωm= 0.27. analysis hence indicates that this provides self-consistent description through large-scale perturbations and homogeneous...
In this paper we present a clustering analysis of quasi-stellar objects (QSOs) using over 20000 from the final catalogue 2dF QSO Redshift Survey (2QZ), measuring redshift-space two-point correlation function, ξ(s). When averaged redshift range 0.3 < z 2.2 find that ξ(s) is flat on small scales, steepening scales above ∼25h−1 Mpc. WMAP/2dF cosmology (Ωm = 0.27, ΩΛ 0.73) best-fitting power law with s0 5.48+0.42−0.48h−1 Mpc and γ= 1.20 ± 0.10 s 1 to 25h−1 We demonstrate non-linear distortions...
We present significant improvements in cosmic distance measurements from the Wig-gleZ Dark Energy Survey, achieved by applying reconstruction of baryonic acoustic feature technique.We show using both data and simulations that technique can often be effective despite patchiness survey, edge effects shot-noise.We investigate three redshift bins range 0.2 < z 1, all find improvement after detection its usage as a standard ruler.We measure model independent measures D V r fid s /r 1716± 83 Mpc,...
Using the complete Galaxy and Mass Assembly I (GAMA-I) survey covering ∼142 deg2 to rAB= 19.4, of which ∼47 is 19.8, we create GAMA-I galaxy group catalogue (G3Cv1), generated using a friends-of-friends (FoF) based grouping algorithm. Our algorithm has been tested extensively on one family mock GAMA lightcones, constructed from Λ cold dark matter N-body simulations populated with semi-analytic galaxies. Recovered properties are robust effects interlopers median unbiased in most important...
This paper presents cosmological results from the final data release of WiggleZ Dark Energy Survey. We perform full analyses different models using power spectra measured at $z=0.22$, 0.41, 0.60, and 0.78, combined with other sets. The limiting factor in this analysis is theoretical modeling galaxy spectrum, including nonlinearities, bias, redshift-space distortions. In we assess several methods for testing them against Gigaparsec simulations (GiggleZ). fit a base set six parameters,...
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...
We present the QSO luminosity function of completed 2dF-SDSS LRG and (2SLAQ) survey, based on QSOs photometrically selected from Sloan Digital Sky Survey imaging data then observed spectroscopically using 2dF instrument Anglo-Australian Telescope. analyse 10637 in redshift range 0.4<z<2.6 to a g-band flux limit 21.85 (extinction corrected) an absolute continuum magnitude Mg(z=2)<-21.5. This sample covers area 191.9 deg^2. The binned agrees with that brighter SDSS main sample, but extends...
We describe the spectroscopic target selection for Galaxy And Mass Assembly (GAMA) survey. The input catalogue is drawn from Sloan Digital Sky Survey (SDSS) and UKIRT Infrared Deep (UKIDSS). initial aim to measure redshifts galaxies in three 4°× 12° regions at 9, 12 14.5 h, on celestial equator, with magnitude selections r < 19.4, z 18.2 KAB 17.6 over all regions, 19.8 12-h region. density 1080 deg−2 region 720 other regions. average GAMA area are compared completed ongoing galaxy redshift...
We combine the quasi-stellar object (QSO) samples from 2dF QSO Redshift Survey (2QZ) and 2dF-Sloan Digital Sky luminous red galaxy (LRG) (2dF-SDSS LRG QSO, hereafter 2SLAQ) in order to investigate clustering of z∼ 1.5 QSOs measure correlation function (ξ). The signal redshift-space projected along sky direction is similar that previously obtained 2QZ sample alone. By fitting functional forms for ξ(σ, π), measured across line sight, we find, as expected, β, dynamical infall parameter Ω0m,...
The stellar initial mass function (IMF) describes the distribution in masses produced from a burst of star formation. For more than fifty years, implicit assumption underpinning most areas research involving IMF has been that it is universal, regardless time and environment. We measure high-mass slope for sample low-to-moderate redshift galaxies Galaxy And Mass Assembly survey. large range luminosities galaxy permits exploration underlying dependencies. A strong IMF-star formation rate...
We present a catalogue comprising over 10 000 QSOs covering an effective area of 289.6 deg2, based on spectroscopic observations with the 2-degree Field (2dF) instrument at Anglo-Australian Telescope. This forms first release 2dF QSO Redshift Survey. candidates 18.25<bJ<20.85 were obtained from single homogeneous colour-selected APM measurements UK Schmidt photographic material. The final will contain approximately 25 and be released to public end 2002, one year after observational phase is...
We present new near-infrared spectroscopic measurements of the Hβ region for a sample 29 luminous high-redshift quasars. have measured width in those sources and added archival to create 92 active galactic nuclei (AGNs) which rest-frame UV N V λ1240 C IV λ1549 emission lines are available. Our spans 6 orders magnitude luminosity includes 31 radio-loud AGNs. It also 10 narrow-line Seyfert 1 galaxies one broad absorption line quasar. find that metallicity, indicated by V/C ratio, is primarily...