Discovery of a Damped Lyα System in a Low-z Galaxy Group: Possible Evidence for Gas Inflow and Nuclear Star Formation

Borthakur, Sanchayeeta; Momjian, Emmanuel; Heckman, Timothy M.; Catinella, Barbara; Vogt, F.; Tumlinson, Jason

doi:10.3847/1538-4357/aaf566

Cited by 15 publications

(13 citation statements)

References 100 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The overlap in velocity space with the closest galaxies is somewhat limited, and much of the absorption bluewards of G0 could be related to the low surface brightness tidal gas predicted in our simulations to be four orders of magnitude below the current detection threshold. These results strenghten previous reports of low-redshift strong-H i absorbers associated with groups (Péroux et al 2017;Bielby et al 2017;Rahmani et al 2018a;Klitsch et al 2018;Rahmani et al 2018b;Klitsch et al 2019;Borthakur et al 2018). Altogether, these findings add to the paradigm shift where our former view of strong-N (H I) quasar absorbers being associated to a single bright galaxy changes towards a picture where the H i gas probed in absorption is related to far more complex galaxy structures.…”

Section: The Typical Environment Of Low-redshift Absorberssupporting

confidence: 85%

“…The virial mass for such system will be 2.9×10 12 M . A number of studies have already reported several counterparts to low-redshift strong-H i absorbers (Péroux et al 2017;Bielby et al 2017;Rahmani et al 2018a;Klitsch et al 2018;Rahmani et al 2018b;Klitsch et al 2019;Borthakur et al 2018) possibly tracing small groups.…”

Section: The Typical Environment Of Low-redshift Absorbersmentioning

confidence: 99%

See 1 more Smart Citation

Multiphase circumgalactic medium probed with MUSE and ALMA

Péroux

Zwaan

Klitsch

et al. 2019

Monthly Notices of the Royal Astronomical Society

104

View full text Add to dashboard Cite

Galaxy halos appear to be missing a large fraction of their baryons, most probably hiding in the circumgalactic medium (CGM), a diffuse component within the dark matter halo that extends far from the inner regions of the galaxies. A powerful tool to study the CGM gas is offered by absorption lines in the spectra of background quasars. Here, we present optical (MUSE) and mm (ALMA) observations of the field of the quasar Q1130−1449 which includes a log [N (HI)/cm −2 ]=21.71±0.07 absorber at z=0.313. Ground-based VLT/MUSE 3D spectroscopy shows 11 galaxies at the redshift of the absorber down to a limiting SFR>0.01 M yr −1 (covering emission lines of [O ii], Hβ, [O iii], [N ii] and Hα), 7 of which are new discoveries. In particular, we report a new emitter with a smaller impact parameter to the quasar line-of-sight (b=10.6 kpc) than the galaxies detected so far. Three of the objects are also detected in CO(1-0) in our ALMA observations indicating long depletion timescales for the molecular gas and kinematics consistent with the ionised gas. We infer from dedicated numerical cosmological RAMSES zoom-in simulations that the physical properties of these objects qualitatively resemble a small group environment, possibly part of a filamentary structure. Based on metallicity and velocity arguments, we conclude that the neutral gas traced in absorption is only partly related to these emitting galaxies while a larger fraction is likely the signature of gas with surface brightness almost four orders of magnitude fainter that current detection limits. Together, these findings challenge a picture where strong-N (H I) quasar absorbers are associated with a single bright galaxy and favour a scenario where the H i gas probed in absorption is related to far more complex galaxy structures.

show abstract

Section: The Typical Environment Of Low-redshift Absorberssupporting

confidence: 85%

Section: The Typical Environment Of Low-redshift Absorbersmentioning

confidence: 99%

Multiphase circumgalactic medium probed with MUSE and ALMA

Péroux

Zwaan

Klitsch

et al. 2019

Monthly Notices of the Royal Astronomical Society

104

View full text Add to dashboard Cite

show abstract

“…In the meantime, we believe that significant progress in understanding the interplay between accretion, CGM, and ISM in satellite galaxies could come in the next 5 to 10 years from the combination of absorption-and emission-line studies across the ultraviolet, optical, and radio regimes. This is a rapidly growing field and, despite the limited amount of data currently available, it is already clear that the combination of wide-area integral-field spectrographs such as MUSE and KCWI (Morrissey et al 2018) with facilities such as ALMA and ASKAP will provide us with important insights on the interplay between different gas phases flowing in and out of galaxies (e.g., Borthakur et al 2019;Frye et al 2019;Péroux et al 2019). Indeed, not surprisingly the picture emerging is already a complex one where, for example, accretion may not always be halted immediately after infall but may depend on the detailed properties of the group and infalling orbit.…”

Section: Closing Thoughts and Outlookmentioning

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

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

“…The origins of cooler, partially neutral gas are not well understood. Possible scenarios include remnants of tidally stripped structures (Davis et al 1997;Bekki 2009;Borthakur et al 2010;Nestor et al 2011;Gauthier 2013;Fossati et al 2019;Chen et al 2019;Péroux et al 2019), in-situ condensation (Voit 2019), outflowing material from star forming galaxies (Veilleux et al 2005;Tripp et al 2011;Nielsen et al 2018;Frye et al 2019) and/or cold gas accretion from the intergalactic medium (Kereš et al 2005;Vogt et al 2015;Bielby et al 2017;Borthakur et al 2019). These processes are all capable of producing strong Lyα absorption.…”

Section: H I Lyα Absorptionmentioning

confidence: 99%

Detection of a Multiphase Intragroup Medium: Results from the COS-IGrM Survey

McCabe,

Borthakur,

Heckman

et al. 2021

Preprint

Self Cite

View full text Add to dashboard Cite

We present the results of the COS Intragroup Medium (COS-IGrM) Survey that used the Cosmic Origins Spectrograph on the Hubble Space Telescope to observe a sample of 18 UV bright quasars, each probing the intragroup medium (IGrM) of a galaxy group. We detect Lyα, C II, N V, Si II, Si III, and O VI in multiple sightlines. The highest ionization species detected in our data is O VI, which was detected in 8 out of 18 quasar sightlines. The wide range of ionization states observed provide evidence that the IGrM is patchy and multiphase. We find that the O VI detections generally align with radiatively cooling gas between 10 5.8 and 10 6 K. The lack of O VI detections in 10 of the 18 groups illustrates that O VI may not be the ideal tracer of the volume filling component of the IGrM. Instead, it either exists at trace levels in a hot IGrM or is generated in the boundary between the hotter IGrM and cooler gas.

show abstract

Discovery of a Damped Lyα System in a Low-z Galaxy Group: Possible Evidence for Gas Inflow and Nuclear Star Formation

Cited by 15 publications

References 100 publications

Multiphase circumgalactic medium probed with MUSE and ALMA

Multiphase circumgalactic medium probed with MUSE and ALMA

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

Detection of a Multiphase Intragroup Medium: Results from the COS-IGrM Survey

Contact Info

Product

Resources

About