A5042798740- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Astrophysics and Star Formation Studies
- Gamma-ray bursts and supernovae
- Astrophysics and Cosmic Phenomena
- Astronomical Observations and Instrumentation
- Radio Astronomy Observations and Technology
- Astrophysical Phenomena and Observations
- Spectroscopy and Laser Applications
- Calibration and Measurement Techniques
- Scientific Research and Discoveries
- Adaptive optics and wavefront sensing
- Geophysics and Gravity Measurements
- CCD and CMOS Imaging Sensors
- Phase Equilibria and Thermodynamics
- Plant Water Relations and Carbon Dynamics
- Remote Sensing in Agriculture
- Cosmology and Gravitation Theories
- Impact of Light on Environment and Health
- COVID-19 diagnosis using AI
- Advanced Image Processing Techniques
- Dark Matter and Cosmic Phenomena
- Atmospheric Ozone and Climate
- Advanced Vision and Imaging
International Centre for Radio Astronomy Research
2016-2025
The University of Western Australia
2016-2025
ARC Centre of Excellence for All-sky Astrophysics
2018-2025
ASTRO-3D
2018-2025
Australian Research Council
2018-2023
ACT Government
2022
Curtin University
2021
Commonwealth Scientific and Industrial Research Organisation
2018
Australian National University
2018
Netherlands Institute for Radio Astronomy
2018
The recently initiated Arecibo Legacy Fast ALFA (ALFALFA) survey aims to map 7000 square degrees of the high galactic latitude sky visible from Arecibo, providing a HI line spectral database covering redshift range between -1600 km/s and 18,000 with 5 resolution. Exploiting Arecibo's large collecting area small beam size, ALFALFA is specifically designed probe faint end mass function in local universe will provide census surveyed flux limits, making it especially useful synergy wide surveys...
We are conducting COLD GASS, a legacy survey for molecular gas in nearby galaxies. Using the IRAM 30m telescope, we measure CO(1-0) line sample of ~350 (D=100-200 Mpc), massive galaxies (log(M*/Msun)>10.0). The is selected purely according to stellar mass, and therefore provides an unbiased view these systems. By combining data with SDSS photometry spectroscopy, GALEX imaging high-quality Arecibo HI data, investigate partition condensed baryons between stars, atomic 0.1-10L* In this paper,...
We study the relation between molecular gas and star formation in a volume-limited sample of 222 galaxies from COLD GASS survey, with measurements CO(1–0) line IRAM 30-m telescope. The are at redshifts 0.025 < z 0.05 have stellar masses range 10.0 log M★/M⊙ 11.5. complemented by deep Arecibo H i observations homogeneous Sloan Digital Sky Survey GALEX photometry. A reference that includes both ultraviolet (UV) far-infrared data is used to calibrate our estimates rates seven optical/UV bands....
We present the extended GALEX Arecibo SDSS Survey (xGASS), a gas fraction-limited census of atomic (HI) content 1179 galaxies selected only by stellar mass ($M_\star =10^{9}-10^{11.5} M_\odot$) and redshift ($0.01<z<0.05$). This includes new observations 208 galaxies, for which we release catalogs HI spectra. In addition to extending GASS scaling relations one decade in mass, quantify total (atomic+molecular) cold fractions molecular-to-atomic ratios, $R_{mol}$, subset 477 observed with IRAM...
We introduce the GALEX Arecibo SDSS Survey (GASS), an on-going large program that is gathering high quality HI-line spectra using radio telescope for unbiased sample of ~1000 galaxies with stellar masses greater than 10^10 Msun and redshifts 0.025<z<0.05, selected from spectroscopic imaging surveys. The are observed until detected or a low gas mass fraction limit (1.5-5%) reached. This paper presents first Data Release, consisting ~20% final GASS sample. use this data set to explore main...
Using observations from the GASS and COLD surveys complementary data SDSS GALEX, we investigate nature of variations in gas depletion time observed across local massive galaxy population. The large unbiased sample allows us to assess relative importance interactions, bar instabilities, morphologies presence AGN regulating star formation efficiency. Both H2 mass fraction vary as a function distance main sequence SFR-M* plane. longest times are found below-main bulge-dominated galaxies that...
We use spectra from the ALFALFA, GASS and COLD surveys to quantify variations in mean atomic molecular gas mass fractions throughout SFR–M* plane along main sequence (MS) of star-forming galaxies. Although galaxies well below MS tend be undetected Arecibo IRAM observations, reliable can obtained through a spectral stacking technique. find that position explained mostly by their global cold reservoirs as observed H i line, with addition systematic molecular-to-atomic ratio star formation...
In this paper we investigate environment driven gas depletion in satellite galaxies, taking full advantage of the atomic hydrogen (HI) spectral stacking technique to quantify content for entire gas-poor -rich regime. We do so using a multi-wavelength sample 10,600 selected according stellar mass (log M$_{\star}$/M$_{\odot}$ $\geq$ 9) and redshift (0.02 $\leq$ z 0.05) from Sloan Digital Sky Survey, with HI data Arecibo Legacy Fast ALFA (ALFALFA) survey. Using key HI-to-stellar scaling...
We introduce xCOLD GASS, a legacy survey providing census of molecular gas in the local Universe. Building upon original COLD GASS survey, we present here full sample 532 galaxies with CO(1-0) measurements from IRAM-30m telescope. The is mass-selected redshift interval $0.01<z<0.05$ SDSS, and therefore representative galaxy population M$_{\ast}>10^9$M$_{\odot}$. flux are complemented by observations CO(2-1) line both APEX telescopes, HI Arecibo, photometry WISE GALEX. Combining IRAM data,...
One of the key open questions in extragalactic astronomy is what stops star formation galaxies. While it clear that cold gas reservoir, which fuels new stars, must be affected first, how this happens and are dominant physical mechanisms involved still a matter debate. At least for satellite galaxies, generally accepted internal processes alone cannot responsible fully quenching their formation, but environment should play an important, if not dominant, role. In nearby clusters, we see...
The cold interstellar medium (ISM) plays a central role in the galaxy evolution process. It is reservoir that fuels growth via star formation, repository of material formed by these stars, and sensitive tracer internal external processes affect entire galaxies. Consequently, significant efforts have gone into systematic surveys ISM galaxies local Universe. This review discusses resulting network scaling relations connecting atomic molecular gas masses with their other global properties...
We use a volume-, magnitude-limited sample of nearby galaxies to investigate the effect environment on H i scaling relations. confirm that i-to-stellar mass ratio anticorrelates with stellar mass, surface density and NUV −r colour across whole range parameters covered by our (109≲M*≲ 1011 M⊙, 7.5 ≲μ*≲ 9.5 M⊙ kpc−2, 2 ≲ −r≲ 6 mag). These relations are also followed in Virgo cluster, although they significantly offset towards lower gas content. Interestingly, difference between field cluster...
We present the final data release from GALEX Arecibo SDSS Survey (GASS), a large program that measured HI properties for an unbiased sample of ~800 galaxies with stellar masses greater than 10^10 Msun and redshifts 0.025
Using constrained simulations of the local universe for generic cold dark matter (CDM) and 1 keV warm (WDM), we investigate difference in abundance halos environment. We find that mass function (MF) within 20 h−1 Mpc Local Group is ∼2 times larger than universal MF 109–1013 M☉ range. Imposing field view ongoing H i blind survey Arecibo Legacy Fast ALFA (ALFALFA) our simulations, predict velocity (VF) Virgo-direction region (VdR) exceeds VF by a factor 3. Furthermore, employing scheme to...
We study the properties of cold gas component interstellar medium Herschel Reference Survey, a complete volume-limited (15 10^10 Mo) from COLD GASS survey down to stellar masses M* ~ 10^9 Mo. As scaling variables we use M*, surface density mu*, specific star formation rate SSFR, and metallicity target galaxies. By comparing molecular determined using constant or luminosity dependent conversion factor, estimate robustness these relations on very uncertain assumptions used transform CO line...
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 first installment of H I sources extracted from Arecibo Legacy Fast ALFA (ALFALFA) extragalactic survey, initiated in 2005. Sources have been three-dimensional spectral data cubes exploiting a matched filtering technique and then examined interactively to yield global parameters. A total 730 detections are cataloged within solid angle 11h44m < R.A. (J2000.0) 14h00m +12° decl. +16° redshift range -1600 km s-1 cz 18,000 s-1. In comparison, Parkes All-Sky Survey detected 40...
The HRS is a complete volume-limited sample of nearby objects including Virgo cluster and isolated objects. Using recent compilation HI CO data we study the effects on molecular gas content spiral galaxies. We first identify M* as scaling variable that traces total H2 mass galaxies better. show that, average, HI-deficient are significantly offset from M(H2) vs. relation for HI-normal use to define H2-deficiency parameter. This parameter shows weak scattered with HI-def, here taken proxy...
We have obtained long-slit spectra of 174 star-forming galaxies with stellar masses greater than 1010 M☉ from the GALEX Arecibo Sloan Digital Sky Survey (GASS) survey. These both H i and H2 mass measurements. The average metallicity profile is strikingly flat out to R90, radius enclosing 90% r-band light. Metallicity profiles which decline steadily are found primarily for in our sample low (log(M*) < 10.2), concentration, and/or mean density. Beyond ∼R90, however, around 10% exhibit a sharp...
We present Herschel PACS observations of the [CII] 158 micron emission line in a sample 24 intermediate mass (9<logM$_\ast$/M$_\odot$<10) and low metallicity (0.4< Z/Z$_\odot$<1.0) galaxies from xCOLD GASS survey. Combining them with IRAM CO(1-0) measurements, we establish scaling relations between integrated molecular region [CII]/CO(1-0) luminosity ratios as function galaxy properties. A Bayesian analysis reveals that only two parameters, offset star formation main sequence, $\Delta$MS,...
We revisit the main HI-to-stellar mass ratio (gas fraction) scaling relations, taking advantage of HI spectral stacking technique to understand dependence gas content on structural and star formation properties nearby galaxies. This work uses a volume-limited, multi-wavelength sample ~25,000 galaxies, selected according stellar (10^9 M_sol < M_* 10^11.5 M_sol) redshift (0.02 z 0.05) from Sloan Digital Sky Survey, with data Arecibo Legacy Fast ALFA survey. bin multiple parameters galaxies...
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 present a comparison of galaxy atomic and molecular gas properties in three recent cosmological hydrodynamic simulations, Simba, EAGLE, Illustris-TNG, versus observations from $z\sim 0-2$. These simulations all rely on similar sub-resolution prescriptions to model cold interstellar which they cannot represent directly, qualitatively reproduce the observed $z\approx 0$ HI H$_2$ mass functions (HIMF, H2MF), CO(1-0) luminosity (COLF), scaling relations stellar mass, specific star formation...