• 18/02/2019: Satellite galaxies undergo little structural change during their quenching phase. New SAMI paper combining SAMI data with EAGLE simulations to show that satellites are not morphologically transformed while quenched. Also highlights the role of progenitor bias in our understanding of environmental effects. You can find more details at this link


  • 01/10/2018: Started Future Fellowship funded by the Australian Research Council.
  • 09/08/2018: The SAMI Galaxy Survey Data Release 2: The second public data release of the SAMI Galaxy Survey is finally out. You can find data cubes, stellar emission line value added products for 1559 nearby galaxies! Everything available via the AAO Data Central archive at this link.


  • 07/02/2018: The eXtended GALEX Arecibo SDSS Survey (xGASS). The xGASS data release is published and publicly available! In this paper, we investigate the total gas scaling relations and how the balance between atomic and molecular hydrogen varies with galaxy properties. You can find more details about the survey, including papers and data here.


  • 26/01/2018: Lurking systematics in predicting galaxy cold gas masses using dust luminosities and star formation rates. Our postdoc Steven Janowiecki completed a critical investigation on the use of dust continuum as a proxy for cold gas content. He shows that scaling relations derived using predicted gas masses may be more closely related to the calibrations used than to the actual galaxies observed. You can find more info here.


  • 21/01/2018: A multiwavelength survey of HI-excess galaxies with surprisingly inefficient star formation. Our postdoc Dr. Katinka Gereb completed the second paper on the analysis of HI-excess galaxies. These are extremely HI-rich systems with very inefficient star formation. This work shows that HI-excess are clearly a mixed-bag population and galaxies in this family had very different evolutionary histories. You can find more info here.


  • 10/10/2017: The gas reservoirs of star-forming disks over the past 3 billion years are not predominantly molecular. The analysis of our ALMA observations of HIGHz galaxies is finally out. We show that atomic hydrogen has been dominating the cold gas mass budget of star-forming galaxies for at least the past three billion years. In addition, despite harboring gas reservoirs that are more typical of objects at the cosmic noon, HIGHz galaxies host regular rotating disks with low gas velocity dispersions suggesting that high total gas fractions do not necessarily drive high turbulence in the interstellar medium. You can find a copy of the paper here, as well as a news release at this link.


  • 26/09/2017: The role of atomic hydrogen in regulating the scatter of the mass-metallicity relation: the last paper of Toby Brown PhD thesis is finally out. Here we use HI stacking to showcase how cold atomic hydrogen is one of the main drivers of the significant scatter observed in the gas-phase metallicity-stellar mass relation. You can find the paper here.toby_oh
  • 26/07/2017: The SAMI Galaxy Survey Data Release 1: The first public data release of the SAMI Galaxy Survey is finally out. You can find data cubes and emission line value added products for 772 nearby galaxies! Everything available via the AAO Data Central archive at this link
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  • 05/04/2017: A SAMI night at the AAT: Have a look at this very nice video by Angel Lopez-Sanchez featuring the SAMI instrument. It includes snapshots from one of our observing runs.

  • 07/03/2017: Bappu Gold Medal: I was awarded the Bappu Gold Medal by the Astronomical Society of India for my contributions to the field of observational extragalactic astronomy. See here for more details.


  • 17/01/2017: Cold gas stripping in satellite galaxies: from group to clusters. Our PhD student Toby Brown completed his second paper presenting the first clear evidence for widespread rapid gas stripping in galaxies in pair and groups. You can find the paper here, and our press release here.


  • 06/01/2017: Gas-rich central in small groups and their connections to cosmic web gas feeding. Our postdoc Steven Janowiecki completed the first work based on the extended GALEX Arecibo SDSS Survey. He finds that central galaxies in small groups are more gas-rich and more actively forming stars and central galaxies in isolation of similar stellar mass. This result suggests that central in small groups may still be fed today by new pristine gas accreting via filaments. You can find the paper here.


  • 14/09/2016: The link between angular momentum and galaxy morphology. My last paper using the SAMI Galaxy Survey to investigate the role of angular momentum in shaping the structure of galaxies. Our work clearly show that the stellar distribution within galaxies is set by their mass and angular momentum. You can find the paper here, and our press release here.


  • 08/08/2016: GASS3505: the prototype of HI-excess passive galaxy. Our postdoc Dr. Katinka Gereb just published a paper analysing an extremely HI-rich passive galaxy, konwn as GASS3503. In optical, this object looks like a red-and-dead elliptical. However, our HI observations reveal a huge reservoir of atomic gas (10 billion solar masses) that is not feeding star formation. Objects like this could help us gain additional insights into the gas cycle in galaxies. More info and link to the paper here.


  • 07/04/2016: The selective effect of environment on the atomic and molecular gas-to-dust ratio of nearby galaxies in the Herschel Reference Survey. My last paper investigating the effect of the cluster environment on the gas-to-dust ratio of nearby galaxies. This work shows that the variation of gas-to-dust ratio is fully consistent with outside-in stripping of the interstellar medium and is simply a consequence of the different distribution of dust, HI and H2 across the disk. More info here.


  • 22/02/2016: Press release on Halpha tail discovered in NGC4569 in the Virgo cluster.
  • 07/09/2015: Started new position at ICRAR/UWA
  • 12/08/2015: Our ALMA Cycle 3 proposal to observe the most massive HI-rich galaxies has been accepted!
  • 10/06/2015: The effect of structure and star formation on the gas content of nearby galaxies. Our current PhD student (Toby Brown) just published his first paper in which he uses HI spectral stacking to investigate the primary and secondary parameters driving the HI scaling relations. The bottom line is that the gas fraction-stellar mass relation is simply a consequence of the star formation law and bimodality of galaxies. More info here.


  • 28/10/2014: HIGHz: A Survey of the Most HI-Massive Galaxies at z~0.2. The first paper of our survey of very HI-rich galaxies at z~0.2 (including the highest redshift HI detection to date) is out. More info here.


  • 15/10/2014: The SAMI Galaxy Survey: Towards a unified dynamical scaling relation for galaxies of all types. My first SAMI work is accepted for publication! We show that the combination of dispersion and rotational velocities for both gas and stars can provide us with a single dynamical scaling relation valid for galaxies of all morphologies, representing a unique tool for investigating the link between kinematics and baryonic content in galaxies. More info here.


  • 18/03/2014: Cosmic dust census completed! With the release of the Herschel/PACS data, the Herschel Reference Survey (the largest representative survey of dust in nearby galaxies) is finally complete! Check out the paper, data and press release.