A detailed look at the stellar populations in green valley galaxies

Angthopo, J.; Ferreras, Ignacio; Silk, Joseph

doi:10.1093/mnras/staa1276

Cited by 27 publications

(15 citation statements)

References 77 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Other than that, the placement of ambiguous bulge disc galaxies in our work suggests that they are dominantly in the green valley, constantly found between pseudo bulge hosting (blue) and classical bulge hosting (red) disc galaxies. Green valley galaxies, in addition to being dusty, have been observed to be a complex mixture of morphology and stellar populations (Schawinski et al 2014;Kelvin et al 2018;Phillipps et al 2019;Angthopo et al 2020). A more exhaustive analysis of discs with ambiguous bulges, including the fitting of multiple components and accounting for the dust and gas fraction, has the potential to provide insight regarding the green valley.…”

Section: Single Structural Indicator For Quenchingmentioning

confidence: 99%

Correlation of structure and stellar properties of galaxies in Stripe 82

Sachdeva,

Ho,

et al. 2020

Preprint

View full text Add to dashboard Cite

Establishing a correlation (or lack thereof) between the bimodal colour distribution of galaxies and their structural parameters is crucial to understand the origin of bimodality. To achieve that, we have performed 2D mass-based structural decomposition (bulge+disc) of all disc galaxies (total=1263) in the Herschel imaging area of the Stripe 82 region using K s band images from the VICS82 survey. The scaling relations thus derived are found to reflect the internal kinematics and are employed in combination to select an indubitable set of classical and pseudo bulge hosting disc galaxies. The rest of the galaxies (< 20%) are marked as discs with "ambiguous" bulges. Pseudo and classical bulge disc galaxies exhibit clear bimodality in terms of all stellar parameters (M * , sSFR, r − K s ). All pseudo bulge disc galaxies are blue and star-forming and all classical bulge disc galaxies are red and quiescent with less than 5% digressions. Ambiguous bulge disc galaxies are intermittent to pseudo and classical bulge disc galaxies in the distribution of all structural and stellar parameters. ∆ µ eb -based on the placement of bulges on the Kormendy relation -is found to be the most efficient single structural indicator of both bulge type and stellar activity. The placement of ambiguous bulge disc galaxies on scaling relations and fundamental plane, in addition to their peculiar stellar properties suggest that they are dominantly a part of the green valley. Subject headings: galaxies: bulges -galaxies: structure -galaxies: star formation -galaxies: stellar content * This table presents the values obtained through single component (Sérsic) 2D fitting and non-parametric fitting of galaxies. The first column is the unique ID we have given to the 1263 objects. The next five columns (2-6) are the magnitude (mg ), effective radius (reg ), Sérsic index (ng), axis ratio (arg ) and position angle (PAg ) of the galaxy. The last three columns (7-9) are the Petrosian radius (r P ), concentration (C) and asymmetry index (A) of the galaxy. The full table has been made available with this work.

show abstract

Section: Single Structural Indicator For Quenchingmentioning

confidence: 99%

Correlation of structure and stellar properties of galaxies in Stripe 82

Sachdeva,

Ho,

et al. 2020

Preprint

View full text Add to dashboard Cite

show abstract

“…There are different methods to define the GV, e.g. by specifying a color cut as a function of stellar mass and redshift (Schawinski et al 2014;Coenda et al 2018), or by using the 4000 Å break strength Angthopo et al (2020).…”

Section: Introductionmentioning

confidence: 99%

NIHAO XXVII: Crossing the green valley

Blank,

Macciò,

Kang

et al. 2022

Preprint

View full text Add to dashboard Cite

The transition of high-mass galaxies from being blue and star forming to being red and dead is a crucial step in galaxy evolution, yet not fully understood. In this work, we use the NIHAO suite of galaxy simulations to investigate the relation between the transition time through the green valley and other galaxy properties. The typical green valley crossing time of our galaxies is approximately 400 Myr, somewhat shorter than observational estimates. The crossing of the green valley is triggered by the onset of AGN feedback and the subsequent shut down of star formation. Interestingly the time spent in the green valley is not related to any other galaxy properties, such as stellar age or metallicity, or the time at which the star formation quenching takes place. The crossing time is set by two main contributions: the ageing of the current stellar population and the residual star formation in the green valley. These effects are of comparable magnitude, while major and minor mergers have a negligible contribution. Most interestingly, we find the time that a galaxy spends to travel through the green valley is twice the 𝑒-folding time of the star formation quenching. This result is stable against galaxy properties and the exact numerical implementation of AGN feedback in the simulation. Assuming a typical crossing time of about one Gyr inferred from observations, our results imply that any mechanism or process aiming to quench star formation, must do it on a typical timescale of 500 Myr.

show abstract

“…However, understanding the details of the mechanisms driving the formation and evolution of galaxies is still an open and unsolved issue. In particular, it remains unclear how galaxies transition from a star-forming to a quenched state (Schawinski et al 2007(Schawinski et al , 2014Bluck et al 2020;Angthopo et al 2020). One of the most popular processes invoked to cease or reduce star formation is the so-called energetic/momentum AGN feedback (e.g.…”

Section: Introductionmentioning

confidence: 99%

Rejuvenation triggers nuclear activity in nearby galaxies

Martin-Navarro,

Shankar,

Mezcua

2021

Preprint

View full text Add to dashboard Cite

Feedback, in particular from active galactic nuclei (AGN), is believed to play a crucial role in the evolution of galaxies. In the local Universe, many galaxies with an AGN are indeed observed to reside in the so-called green valley, usually interpreted as a transition phase from a blue star-forming to a red quenched state. We use data from the Sloan Digital Sky Survey to show that such an interpretation requires substantial revision. Optically-selected nearby AGN galaxies follow exponentially declining star formation histories, as normal galaxies of similar stellar and dark matter halo mass, reaching in the recent past (∼0.1 Gyr ago) star formation rate levels consistent with a quiescent population. However, we find that local AGN galaxies have experienced a sudden increase in their star formation rate, unfolding on timescales similar to those typical of AGN activity, suggesting that both star formation and AGN activity were triggered simultaneously. We find that this quenching followed by an enhancement in the star formation rate is common to AGN galaxies and more pronounced in early type galaxies. Our results demonstrate that local AGN galaxies are not just a simple transition type between star-forming and quiescent galaxies as previously postulated.

show abstract

A detailed look at the stellar populations in green valley galaxies

Cited by 27 publications

References 77 publications

Correlation of structure and stellar properties of galaxies in Stripe 82

Correlation of structure and stellar properties of galaxies in Stripe 82

NIHAO XXVII: Crossing the green valley

Rejuvenation triggers nuclear activity in nearby galaxies

Contact Info

Product

Resources

About