Ram pressure stripping made easy: an analytical approach

Köppen, J.; Jáchym, Pavel; Taylor, R.; Palouš, J.

doi:10.1093/mnras/sty1610

Cited by 30 publications

(71 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…More recently, the discovery of one-headed HI tails, in some cases pointing away from the Xray centre of clusters, has provided even more direct proof for the importance of stripping in removing cold hydrogen from the starforming disc (e.g., Oosterloo & van Gorkom 2005;Chung et al 2007;Ramatsoku et al 2019;Deb et al 2020). Indeed, for the typical ICM density of ∼10 -3 cm -3 inferred from X-ray observations, infalling velocities of ∼1 000 km s −1 are enough for ram pressure to strip at least part of the atomic hydrogen content from the starforming disc of galaxies (Gunn & Gott 1972;Köppen et al 2018).…”

Section: Figurementioning

confidence: 98%

“…It is clear that, for surface densities typically observed at a galaxy's optical radius (e.g., Leroy et al 2008;Sánchez Almeida 2020), ram pressure can be strong enough, even for IGM densities a factor of a few smaller and orbital velocities five times slower than for galaxies passing through the centre of massive clusters (see also the modelling presented by Hester 2006 andKöppen et al 2018).…”

Section: Is Ram Pressure Efficient In the Group Environment?mentioning

confidence: 99%

See 1 more Smart Citation

The Dawes Review 9: The role of cold gas stripping on the star formation quenching of satellite galaxies

Cortese

Catinella

Smith

2021

Publ. Astron. Soc. Aust.

133

View full text Add to dashboard Cite

One of the key open questions in extragalactic astronomy is what stops star formation in galaxies. While it is clear that the cold gas reservoir, which fuels the formation of new stars, must be affected first, how this happens and what are the dominant physical mechanisms involved is still a matter of debate. At least for satellite galaxies, it is generally accepted that internal processes alone cannot be responsible for fully quenching their star formation, but that environment should play an important, if not dominant, role. In nearby clusters, we see examples of cold gas being removed from the star-forming discs of galaxies moving through the intracluster medium, but whether active stripping is widespread and/or necessary to halt star formation in satellites, or quenching is just a consequence of the inability of these galaxies to replenish their cold gas reservoirs, remains unclear. In this work, we review the current status of environmental studies of cold gas in star-forming satellites in the local Universe from an observational perspective, focusing on the evidence for a physical link between cold gas stripping and quenching of the star formation. We find that stripping of cold gas is ubiquitous in satellite galaxies in both group and cluster environments. While hydrodynamical mechanisms such as ram pressure are important, the emerging picture across the full range of dark matter halos and stellar masses is a complex one, where different physical mechanisms may act simultaneously and cannot always be easily separated. Most importantly, we show that stripping does not always lead to full quenching, as only a fraction of the cold gas reservoir might be affected at the first pericentre passage. We argue that this is a key point to reconcile apparent tensions between statistical and detailed analyses of satellite galaxies, as well as disagreements between various estimates of quenching timescales. We conclude by highlighting several outstanding questions where we expect to see substantial progress in the coming decades, thanks to the advent of the Square Kilometre Array and its precursors, as well as the next-generation optical and millimeter facilities.

show abstract

Section: Figurementioning

confidence: 98%

Section: Is Ram Pressure Efficient In the Group Environment?mentioning

confidence: 99%

The Dawes Review 9: The role of cold gas stripping on the star formation quenching of satellite galaxies

Cortese

Catinella

Smith

2021

Publ. Astron. Soc. Aust.

133

View full text Add to dashboard Cite

show abstract

“…We demonstrated using statistical analyses that our 10 most confident detections are too bright, extended and coherent to be a result of noise. The predictions from the Köppen et al (2018) model appear to hold true. Furthermore we can make a quantitative prediction for future surveys that streams will be most commonly associated with galaxies with P loc /P req 0.2.…”

Section: Summary and Discussionmentioning

confidence: 76%

“…Using the Köppen et al (2018) model, and assuming radial infall, we can estimate the point at which the ram pressure becomes sufficient to start removing gas from the galaxy. We assume this occurs when the ratio P loc /P req ≥ 0.5.…”

Section: The Evolution Of the Streamsmentioning

confidence: 99%

Faint and Fading Tails: The Fate of Stripped H i Gas in Virgo Cluster Galaxies

Taylor

Köppen

Jáchym

et al. 2020

View full text Add to dashboard Cite

Although many galaxies in the Virgo cluster are known to have lost significant amounts of Hi gas, only about a dozen features are known where the Hi extends significantly outside its parent galaxy. Previous numerical simulations have predicted that Hi removed by ram pressure stripping should have column densities far in excess of the sensitivity limits of observational surveys. We construct a simple model to try and quantify how many streams we might expect to detect. This accounts for the expected random orientation of the streams in position and velocity space as well as the expected stream length and mass of stripped Hi. Using archival data from the Arecibo Galaxy Environment Survey, we search for any streams which might previously have been missed in earlier analyses. We report the confident detection of ten streams as well as sixteen other less sure detections. We show that these well-match our analytic predictions for which galaxies should be actively losing gas, however the mass of the streams is typically far below the amount of missing Hi in their parent galaxies, implying that a phase change and/or dispersal renders the gas undetectable. By estimating the orbital timescales we estimate that dissolution rates of 1-10 M ⊙ yr −1 are able to explain both the presence of a few long, massive streams and the greater number of shorter, less massive features.

show abstract

“…In this scenario, the gravitational restoring force at a given radius, 𝑟, within the disc of a galaxy can be estimated from (e.g. Roediger & Brüggen 2006;Köppen et al 2018),…”

Section: Discussionmentioning

confidence: 99%

WALLABY pilot survey: first look at the Hydra I cluster and ram pressure stripping of ESO 501−G075

Reynolds

Westmeier

Elagali

et al. 2021

Monthly Notices of the Royal Astronomical Society

View full text Add to dashboard Cite

We present results from neutral atomic hydrogen (H i) observations of Hydra I, the first cluster observed by the Widefield ASKAP L-band Legacy All-sky Blind Survey (WALLABY) on the Australian Square Kilometre Array Pathfinder. For the first time we show that WALLABY can reach its final survey sensitivity. Leveraging the sensitivity, spatial resolution and wide field of view of WALLABY, we identify a galaxy, ESO 501−G075, that lies near the virial radius of Hydra I and displays an H i tail. ESO 501−G075 shows a similar level of morphological asymmetry as another cluster member, which lies near the cluster centre and shows signs of experiencing ram pressure. We investigate possible environmental processes that could be responsible for producing the observed disturbance in the H i morphology of ESO 501−G075. We rule out tidal interactions, as ESO 501−G075 has no nearby neighbours within ∼0.34 Mpc. We use a simple model to determine that ram pressure can remove gas from the disc at radii r ≳ 25 kpc. We conclude that, as ESO 501−G075 has a typical H i mass compared to similar galaxies in the field and its morphology is compatible with a ram pressure scenario, ESO 501−G075 is likely recently infalling into the cluster and in the early stages of experiencing ram pressure.

show abstract

Ram pressure stripping made easy: an analytical approach

Cited by 30 publications

References 41 publications

The Dawes Review 9: The role of cold gas stripping on the star formation quenching of satellite galaxies

The Dawes Review 9: The role of cold gas stripping on the star formation quenching of satellite galaxies

Faint and Fading Tails: The Fate of Stripped H i Gas in Virgo Cluster Galaxies

WALLABY pilot survey: first look at the Hydra I cluster and ram pressure stripping of ESO 501−G075

Contact Info

Product

Resources

About