A Large-scale Kinematic Study of Molecular Gas in High-z Cluster Galaxies: Evidence for High Levels of Kinematic Asymmetry

Cramer, W. J.; Noble, Allison; Cairns, J.; Clements, D. L.; Cooper, Michael C.; Demarco, R.; Matharu, Jasleen; McDonald, Michael; Muzzin, Adam; Nantais, Julie; Rudnick, G.; Übler, Hannah; Kampen, E. van; Webb, Tracy; Wilson, Gillian; Yee, H. K. C.

doi:10.3847/1538-4357/acae96

Cited by 7 publications

(1 citation statement)

References 90 publications

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“…In the high-density environment, like groups or clusters, the galaxies close to the centre are observed to have very low HI gas (Cayatte et al 1994(Cayatte et al , 1990Solanes et al 2001;Vollmer et al 2006;van den Bergh et al 1990), low star formation rate (Gomez et al 2003;Mun et al 2021), early-type morphology (Goto et al 2003;Pimbblet 2003) and high degree of assymetry in the galaxy disc (Cramer et al 2023). Gunn & Gott III (1972) proposed a mechanism called Ram Pressure Stripping (RPS) to explain the dearth of gas in galaxies in clusters of galaxies.…”

Section: Introductionmentioning

confidence: 99%

Extent of Adoption of Happy Seeder Technology among the Farmers of Punjab (India)

Singh¹,

Kaur²,

Singh³

2021

IJEE

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Cultivation of paddy on large area has resulted in problem paddy straw burning. Although, there are many alternatives available to the farmers but none of these is significantly adopted by them. Happy Seeder Technology (HST) was introduced to tackle the problem of paddy straw burning. The study was conducted to find the rate and extent of adoption of HST among the farmers by characterizing the extension efforts. One hundred and eighty HST adopter farmers were selected from the five agro-climatic zones Punjab. Average area under HST was about 58 per cent of the total operational land holdings of respective farmers. From awareness to adoption average forty months were taken by the farmers to complete the five stages of adoption process. Attributes of the technology viz. relative advantages, trialability, observability and compatibility had positive effect on the rate of adoption. Extension activities, easy availability of HST and large operational land holding had a positive effect on the rate of adoption of HST.

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Section: Introductionmentioning

confidence: 99%

Extent of Adoption of Happy Seeder Technology among the Farmers of Punjab (India)

Singh¹,

Kaur²,

Singh³

2021

IJEE

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The ALMA-ALPAKA survey

Rizzo,

Roman-Oliveira,

Fraternali

et al. 2023

A&A

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Context. Spatially resolved studies of the kinematics of galaxies provide crucial insights into their assembly and evolution, enabling one to infer the properties of the dark matter halos, derive the impact of feedback on the interstellar medium (ISM), as well as measure and characterize the outflow motions. To date, most of the kinematic studies at z = 0.5 − 3.5 have been obtained using emission lines tracing the warm, ionized gas (e.g., Hα, [OII], and [OIII]). However, whether these provide an exhaustive or only a partial view of the dynamics of galaxies and of the properties of the ISM is still debated. Complementary insights into the cold gas kinematics are therefore needed. Aims. We present the Archival Large Program to Advance Kinematic Analysis (ALPAKA), a project aimed at gathering high-resolution observations of CO and [CI] emission lines of star-forming galaxies at z = 0.5 − 3.5 from the Atacama Large Millimeter Array (ALMA) public archive. With ≈147 h of total integration time, ALPAKA assembles ∼0.25″ observations for 28 star-forming galaxies, which is the largest sample with spatially resolved cold gas kinematics as traced by either CO or [CI] at z ≳ 0.5, spanning 7 Gyr of cosmic history. A large fraction of ALPAKA galaxies (19 out of 28) lie in overdense regions (clusters, groups, and protoclusters). Methods. By combining multiwavelength ground- and space-based ancillary data, we derived the stellar masses (M⋆) and star-formation rates (SFRs) for the ALPAKA targets. We exploited the ALMA data to infer the dynamical state of the ALPAKA galaxies and derive their rotation curves and velocity dispersion profiles using 3DBAROLO. Results. ALPAKA probes the massive (M⋆ ≳ 1010 M⊙), actively star-forming (SFR ≈ 10 − 3000 M⊙ yr−1) part of the population of galaxies at z ∼ 0.5 − 3.5. Based on our kinematic classification, we find that 19 out of 28 ALPAKA galaxies are rotating disks, two are interacting systems, while for the remaining seven sources the classification is uncertain. The disks have velocity dispersion values that are typically larger in the innermost regions than in the outskirts, with a median value for the entire disk sample of 35−9+11 km s−1. Despite the bias of our sample toward galaxies hosting very energetic mechanisms, the ALPAKA disks have high ratios of ordered-to-random motion (V/σ) with a median value of 9−2+7.

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When the well runs dry: modelling environmental quenching of high-mass satellites in massive clusters at z ≳ 1

Baxter,

Cooper,

Balogh

et al. 2023

Monthly Notices of the Royal Astronomical Society

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We explore models of massive (>1010 M⊙) satellite quenching in massive clusters at z ≳ 1 using an MCMC framework, focusing on two primary parameters: Rquench (the host-centric radius at which quenching begins) and τquench (the time-scale upon which a satellite quenches after crossing Rquench). Our MCMC analysis shows two local maxima in the 1D posterior probability distribution of Rquench at approximately 0.25 and 1.0 R200. Analysing four distinct solutions in the τquench–Rquench parameter space, nearly all of which yield quiescent fractions consistent with observational data from the GOGREEN survey, we investigate whether these solutions represent distinct quenching pathways and find that they can be separated between ‘starvation’ and ‘core quenching’ scenarios. The starvation pathway is characterized by quenching time-scales that are roughly consistent with the total cold gas (H2 + H i) depletion time-scale at intermediate z, while core quenching is characterized by satellites with relatively high line-of-sight velocities that quench on short time-scales (∼0.25 Gyr) after reaching the inner region of the cluster (<0.30 R200). Lastly, we break the degeneracy between these solutions by comparing the observed properties of transition galaxies from the GOGREEN survey. We conclude that only the ‘starvation’ pathway is consistent with the projected phase-space distribution and relative abundance of transition galaxies at z ∼ 1. However, we acknowledge that ram pressure might contribute as a secondary quenching mechanism.

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A Large-scale Kinematic Study of Molecular Gas in High-z Cluster Galaxies: Evidence for High Levels of Kinematic Asymmetry

Cited by 7 publications

References 90 publications

Extent of Adoption of Happy Seeder Technology among the Farmers of Punjab (India)

Extent of Adoption of Happy Seeder Technology among the Farmers of Punjab (India)

The ALMA-ALPAKA survey

When the well runs dry: modelling environmental quenching of high-mass satellites in massive clusters at z ≳ 1

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