Simon Weng

MUSE-ALMA Halos XI: Gas flows in the circumgalactic medium

Simon Weng, CÃ©line PÃ©roux, Arjun Karki +12

The flow of gas into and out of galaxies leaves traces in the circumgalactic medium which can then be studied using absorption lines towards background quasars. We analyse 27 log(N…

astro-ph.GA2026

Finding Halos in the Lyman- $I^\pm$ forest I. Introducing a hierarchical absorption framework

Duarte MuÃ±oz Santos, Matthew M. Pieri, Dylan Nelson +3

It has been demonstrated that one can track down galaxies in absorption 'hidden' in the Lyman- $I^\pm$ forest through the use of 'strong, blended Lyman- $I^\pm$ ' (or SBLA) absorption. Spec…

The FLASH pilot survey: an HI absorption search against MRC 1-Jy radio sources

J. N. H. S. Aditya, Hyein Yoon, James R. Allison +16

We report an ASKAP search for associated HI 21-cm absorption against bright radio sources from the Molonglo Reference Catalogue (MRC) 1-Jy sample. The search uses pilot survey data…

MUSE-ALMA Haloes VII: Survey Science Goals & Design, Data Processing and Final Catalogues

CÃ©line PÃ©roux, Simon Weng, Arjun Karki +16

The gas cycling in the circumgalactic regions of galaxies is known to be multi-phase. The MUSE-ALMA Haloes survey gathers a large multi-wavelength observational sample of absorptio…

FLASH Pilot Survey: Detections of associated 21 cm HI absorption in GAMA galaxies at 0.42 < z <1.00

Renzhi Su, Elaine M. Sadler, James R. Allison +12

We present the results of a search for associated 21 cm HI absorption at redshift 0.42 < z < 1.00 in radio-loud galaxies from three Galaxy And Mass Assembly (GAMA) survey fields. T…

VLBI studies of FLASH H I 21-cm absorbers -- I

J. N. H. S. Aditya, Elaine M. Sadler, Raffaella Morganti +9

We have conducted VLBA 1.4 GHz (L-band) continuum observations towards twelve sources with HI 21-cm absorption detections at redshift $0.4 < z < 0.7$ in the pilot surveys of FLASH, an…

The Column Densities of Molecular Gas across Cosmic Time: Bridging Observations and Simulations

Roland Szakacs, CÃ©line PÃ©roux, Martin A. Zwaan +5

Observations of the cosmic evolution of different gas phases across time indicate a marked increase in the molecular gas mass density towards $z \sim 2 - 3$ . Such a transformation imp…

The BarYon CYCLE Project (ByCycle): Identifying and Localizing MgII Metal Absorbers with Machine Learning

Roland Szakacs, CÃ©line PÃ©roux, Dylan Nelson +6

The upcoming ByCycle project on the VISTA/4MOST multi-object spectrograph will offer new prospects of using a massive sample of $\sim 1$ million high spectral resolution ( $R$ = 20,…

Does a radio jet drive the massive multi-phase outflow in the ultra-luminous infrared galaxy IRAS 10565+2448?

Renzhi Su, Elizabeth K. Mahony, Minfeng Gu +14

We present new upgraded Giant Metrewave Radio Telescope (uGMRT) HI 21-cm observations of the ultra-luminous infrared galaxy IRAS 10565+2448, previously reported to show blueshifted…

astro-ph.GA2026

MUSE-ALMA Haloes XIII. Molecular gas in $z \sim 0.5$ HI-selected galaxies

Victoria Bollo, Celine Peroux, Martin Zwaan +11

We present new results from the MUSE-ALMA Haloes survey, covering 79 galaxies associated with strong HI absorption at redshift about 0.5. Our ALMA Cycle 10 observations add 39 syst…

The First Large Absorption Survey in HI (FLASH): II. Pilot Survey data release and first results

Hyein Yoon, Elaine M. Sadler, Elizabeth K. Mahony +41

The First Large Absorption Survey in HI (FLASH) is a large-area radio survey for neutral hydrogen in the redshift range 0.4<z<1.0, using the 21cm HI absorption line as a probe of c…

MUSE-ALMA Haloes IX: Morphologies and Stellar Properties of Gas-rich Galaxies

Arjun Karki, Varsha P. Kulkarni, Simon Weng +15

Understanding how galaxies interact with the circumgalactic medium (CGM) requires determining how galaxies morphological and stellar properties correlate with their CGM properties.…

ALMACAL XIII. Evolution of the CO luminosity function and the molecular gas mass density out to $z$ ~ 6

Victoria Bollo, CÃ©line PÃ©roux, Martin Zwaan +7

Cold molecular gas, largely traced by CO emission, is the primary fuel for star formation, making it essential for understanding galaxy evolution. ALMA has made significant progres…

MUSE-ALMA Haloes VIII: Statistical Study of Circumgalactic Medium Gas

Simon Weng, CÃ©line PÃ©roux, Arjun Karki +15

The distribution of gas and metals in the circumgalactic medium (CGM) plays a critical role in how galaxies evolve. The MUSE-ALMA Halos survey combines MUSE, ALMA and HST observati…

The physical origins of gas in the circumgalactic medium using observationally-motivated TNG50 mocks

Simon Weng, Celine Peroux, Rahul Ramesh +5

Absorbers in the spectrum of background objects probe the circumgalactic medium (CGM) surrounding galaxies, but its physical properties remain unconstrained. We use the cosmologica…

astro-ph.GA2026

FEASTS and MHONGOOSE: HI Column Density Distribution at $z = 0$ for $N_{HI} > 1 0^{17.8} cm^{- 2}$

Jing Wang, Xuchen Lin, Ze-Zhong Liang +24

We present the first $z = 0$ HI column density distribution function, $f (N_{HI})$ , extending down to $lo g (N_{HI} / cm^{- 2}) = 17.8$ . This was derived from high-s…

FEASTS Combined with Interferometry (IV): Mapping HI Emission to a limit of $N_{HI} = 1 0^{17.7} cm^{- 2}$ in Seven Edge-on Galaxies

Dong Yang, Jing Wang, Zhijie Qu +17

We present a statistical study of the neutral atomic hydrogen (HI) gas extending into the circumgalactic medium perpendicular to the disk for 7 edge-on galaxies with inclinations a…

A search for cold molecular outflows in cosmic noon galaxies

Ivanna Langan, GergÃ¶ Popping, Michele Ginolfi +4

The flow of baryons in and out of galaxies is the primary driver for galaxy evolution. In addition to depleting the gas reservoir of galaxies, outflows also enrich their circumgala…

astro-ph.GA2021

HI absorption at z~0.7 against the lobe of the powerful radio galaxy PKS 0409-75

Elizabeth K. Mahony, James R. Allison, Elaine M. Sadler +15

We present results from a search for the HI 21-cm line in absorption towards 16 bright radio sources with the 6-antenna commissioning array of the Australian Square Kilometre Array…

Observations of cold extragalactic gas clouds at $z = 0.45$ towards PKS 1610-771

Simon Weng, Elaine M. Sadler, Caroline Foster +7

We present results from MUSE observations of a 21-cm HI absorption system detected with the Australian Square Kilometre Array Pathfinder radio telescope at redshift $z = 0.4503$ to…

ALMACAL XIV: X-Shooter Spectroscopy, Infrared Properties and Radio SEDs of Calibrators

Simon Weng, Elaine M. Sadler, Emily Kerrison +8

The ALMACAL-22 survey includes over 2700 hours of observations of ALMA phase and amplitude calibrators, spanning frequencies from 84 to 950 GHz across bands 3 to 10. In total, 687…

astro-ph.GA2024

MUSE-ALMA Haloes X: The stellar masses of gas-rich absorbing galaxies

The physical processes by which gas is accreted onto galaxies, transformed into stars and then expelled from galaxies are of paramount importance to galaxy evolution studies. Obser…