Nine Billion Years of Neutral Gas Evolution

Session

HI surveys [chair: Jacqueline van Gorkom]

1

Jul 29, 2019, 9:05 AM

Eridanus Auditorium (ESO)

Contribution list Timetable

66. The origin and fate of HI in and around galaxies: the view from simulations

Claudia Lagos (ICRAR)

7/29/19, 9:05 AM

In the last years, we have seen immense progress in the success of cosmological galaxy formation simulations in reproducing a range of observables. We are now at a point in which we have converged to approximately predict the correct evolution of the stellar mass growth of galaxies. However, the main challenge we currently face is that the latter is achieved for sometimes very different...

28. Omega_HI at z ~ 0 from ALFALFA

Michael Jones (Instituto de Astrofísica de Andalucía)

7/29/19, 9:35 AM

In the era of SKA it will finally be possible to detect HI in emission beyond $z \sim 0$ over medium and wide area surveys. This will allow us to constrain the redshift evolution of HI emission in much finer detail than what is currently possible with stacking experiments and pencil beam surveys. With this improved data we will be much better equipped to address the apparent disconnect that...

3. WALLABY science goals and challenges

Baerbel Koribalski (CSIRO Astronomy and Space Science)

7/29/19, 9:55 AM

I will summarise the key science goals for the ASKAP HI All Sky Survey (WALLABY), aiming to survey three quarters of the sky (Dec < +30 deg) out to a redshift of z = 0.26. The WALLABY resolution will be ~30 arcsec and 4 km/s. ASKAP has now started operating with the full array of 36 x 12-m antennas, each equipped with a wide-field Phased Array Feed (PAF). I will present the latest HI...

44. Atomic hydrogen and star formation in galaxies at intermediate redshifts

Apurba Bera (NCRA-TIFR)

7/29/19, 10:15 AM

Understanding the evolution of galaxies over cosmic time is one of the most important goals of modern astrophysics. In the recent past a number of deep optical studies of high-redshift galaxies have provided information on the evolution of the stellar mass, star formation rate, luminosity function and morphological properties of the galaxy population. However, these studies provide no...

31. The MeerKAT MIGHTEE-HI survey: early science

Natasha Maddox (USM LMU)

7/29/19, 11:05 AM

The successful commissioning of MeerKAT is opening new parameter space for observations of HI, enabling large-area surveys spanning cosmological redshifts to be undertaken. MIGHTEE, the medium-deep survey with the South African SKA precursor MeerKAT, will cover 30 square degrees commensally in both radio continuum and spectral line modes. Early science data products confirm the excellent...

37. The atomic hydrogen content of galaxies at z ~ 1

Aditya Chowdhury (National Centre for Radio Astrophysics, NCRA-TIFR)

7/29/19, 11:25 AM

Atomic gas is a key component that impacts galaxy formation and evolution over cosmic time. A number of galaxy redshift surveys have firmly established that star formation in galaxies peaks at $z \sim 1-3$, with the cosmic star formation rate density being an order of magnitude higher than in the local universe. However little is known about the neutral gas content (i.e., the fuel for the star...

42. An HI-selected galaxy sample at redshift 0.4 < z < 1

Elaine Sadler (CSIRO and University of Sydney)

7/29/19, 11:45 AM

We present the results of a pilot study using the Australian SKA Pathfinder (ASKAP) radio telescope to search for 21cm neutral hydrogen (HI) absorption in distant galaxies that lie along the line of sight to bright background radio sources. This has allowed us to identify a small sample of galaxies in the redshift range $0.4 < z < 1$ selected on the basis of their HI content alone, without...

58. Cold atomic gas evolution at 0<z<3.5 using MeerKAT and uGMRT

Neeraj Gupta (IUCAA)

7/29/19, 12:05 PM

The MeerKAT Absorption Line Survey (MALS) will use MeerKAT’s L- and UHF-band receivers to carry out the most sensitive search of associated and intervening 21-cm absorbers at $0 < z < 1.5$. It will trace the relationship between cold atomic gas in galaxies, and the evolution of SFRD and AGN feedback. With uGMRT, we have recently completed a blind search of associated and intervening absorbers...