The ALMaQUEST Survey. VII. Star Formation Scaling Relations of Green Valley Galaxies

Lin, Lihwai; Ellison, Sara L.; Pan, Hsi-An; Thorp, Mallory; Yu, Po-Chieh; Belfiore, Francesco; Hsieh, Bau-Ching; Maiolino, R.; Ramya, S.; Sanchez, Sebastian Francisco Sanchez; Su, Yung-Chau

doi:10.3847/1538-4357/ac4ccc

Cited by 16 publications

(40 citation statements)

References 83 publications

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“…The dearth of galaxies in the transitional region, which is known as the "green valley" (GV) region (Martin et al 2007;Salim et al 2007;Schiminovich et al 2007;Wyder et al 2007;Salim 2014), indicates that the migration from blue cloud to red sequence is relatively rapid (Martin et al 2007). Therefore, investigations of intermediate galaxies residing in this transitional region can give insights into galaxy evolution (e.g., Schawinski et al 2014;Gu et al 2018;Suess et al 2021;Lin et al 2022).…”

Section: Introductionmentioning

confidence: 99%

The Size–Mass Relation of Post-starburst Galaxies in the Local Universe

Chen

Lin

Kong

et al. 2022

ApJ

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We present a study of the size–mass relation for local post-starburst (PSB) galaxies at z ≲ 0.33 selected from the Sloan Digital Sky Survey Data Release 8. We find that PSB galaxies with stellar mass (M *) at 109 M ☉ < M * < 1012 M ☉ have a galaxy size smaller than or comparable to those of quiescent galaxies (QGs). After controlling redshift and stellar mass, the sizes of PSBs are ∼13% smaller on average than those of QGs; such differences become larger and significant toward the low-M * end, especially at 109.5 M ☉ ≲ M * ≲ 1010.5 M ☉ where PSBs can be on average ∼19% smaller than QGs. By comparing predictions of possible PSB evolutionary pathways from cosmological simulations, we suggest that a fast quenching of star formation following a short-lived starburst event (which might be induced by a major merger) should be the dominant pathway of our PSB sample. Furthermore, by cross-matching with group catalogs, we confirm that local PSBs at M * ≲ 1010 M ☉ are more clustered than more massive ones. PSBs residing in groups are found to be slightly larger in galaxy size and more disk-like compared to field PSBs, which is qualitatively consistent with and thus hints at the environment-driven fast quenching pathway for group PSBs. Taken together, our results support multiple evolutionary pathways for local PSB galaxies: while massive PSBs are thought of as products of fast quenching following a major merger-induced starburst, environment-induced fast quenching should play a role in the evolution of less massive PSBs, especially at M * ≲ 1010 M ☉.

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Section: Introductionmentioning

confidence: 99%

The Size–Mass Relation of Post-starburst Galaxies in the Local Universe

Chen

Lin

Kong

et al. 2022

ApJ

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“…Although we do not pre-select galaxies based on their spectral classification or based on the position on the M * -SFR or color-magnitude diagrams, as a matter of fact passive galaxies are essentially excluded by the spaxels selection requirements as well as the requirements on the H𝛼 signal-to-noise and EW outlined below. However, many star forming regions in green valley galaxies are retained by our selection (see Lin et al 2022, where they show that there are a considerable number of star forming spaxels in the ALMaQUEST green valley sample).…”

Section: Selection Of Galaxies and Spaxelsmentioning

confidence: 99%

The metallicity’s fundamental dependence on both local and global galactic quantities

Baker

Maiolino

Belfiore

et al. 2022

Monthly Notices of the Royal Astronomical Society

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We study the scaling relations between gas-phase metallicity, stellar mass surface density (Σ*), star formation rate surface density (ΣSFR), and molecular gas surface density ($\Sigma _{H_2}$) in local star-forming galaxies on scales of a kpc. We employ optical integral field spectroscopy from the MaNGA survey, and ALMA data for a subset of MaNGA galaxies. We use Partial Correlation Coefficients and Random Forest regression to determine the relative importance of local and global galactic properties in setting the gas-phase metallicity. We find that the local metallicity depends primarily on Σ* (the resolved mass-metallicity relation, rMZR), and has a secondary anti-correlation with ΣSFR (i.e. a spatially-resolved version of the ‘Fundamental Metallicity Relation’, rFMR). We find that $\Sigma _{H_2}$ is less important than ΣSFR in determining the local metallicity. This result indicates that gas accretion, resulting in local metallicity dilution and local boosting of star formation, is unlikely to be the primary origin of the rFMR. The local metallicity depends also on the global properties of galaxies. We find a strong dependence on the total stellar mass (M*) and a weaker (inverse) dependence on the total SFR. The global metallicity scaling relations, therefore, do not simply stem out of their resolved counterparts; global properties and processes, such as the global gravitational potential well, galaxy-scale winds and global redistribution/mixing of metals, likely contribute to the local metallicity, in addition to local production and retention.

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“…We use an uncertainty of 0.15 dex for the integrated stellar masses based on uncertainty estimates from Pace et al (2019). We also plot the star-forming main-sequence sample of 12 galaxies from ALMaQUEST, which have a specific star formation rate (sSFR) > 10 −10.5 yr −1 (Lin et al 2022). The main-sequence sample (hereafter, star forming) also excludes the 12 ALMaQUEST galaxies selected specifically for their starburst properties in Ellison et al (2020), making up the ALMaQUEST starburst sample.…”

Section: Sample Selectionmentioning

confidence: 99%

Resolved Molecular Gas Observations of MaNGA Post-starbursts Reveal a Tumultuous Past

Otter

Rowlands

Alatalo

et al. 2022

ApJ

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Post-starburst (PSB) galaxies have recently and rapidly quenched their star formation; thus, they are an important way to understand how galaxies transition from star-forming late types to quiescent early types. The recent discovery of large cold gas reservoirs in PSB galaxies calls into question the theory that galaxies must lose their gas to become quiescent. Optical Integral Field Spectroscopy (IFS) surveys have revealed two classes of PSB galaxies: central PSB (cPSB) galaxies with central quenching regions and ring PSB (rPSB) galaxies with quenching in their outskirts. We analyze a sample of 13 nearby (z < 0.1) PSB galaxies with spatially resolved optical IFS data from the Mapping Nearby Galaxies at Apache Point Observatory survey and matched resolution Atacama Large Millimeter/submillimeter Array observations of 12CO(1–0). Disturbed stellar kinematics in 7/13 of our PSB galaxies and centrally concentrated molecular gas is consistent with a recent merger for most of our sample. In galaxies without merger evidence, alternate processes may funnel gas inward and suppress star formation, which may include outflows, stellar bars, and minor mergers or interactions. The star formation efficiencies of the PSB regions in nearly half our galaxies are suppressed while the gas fractions are consistent with star-forming galaxies. Active galactic nucleus (AGN) feedback may drive this stabilization, and we observe AGN-consistent emission in the centers of 5/13 galaxies. Finally, our cPSB and rPSB galaxies have similar properties except the ionized and molecular gas in cPSB galaxies is more disturbed. Overall, the molecular gas in our PSB galaxies tends to be compact and highly disturbed, resulting in concentrated gas reservoirs unable to form stars efficiently.

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The ALMaQUEST Survey. VII. Star Formation Scaling Relations of Green Valley Galaxies

Abstract: We utilize the ALMA-MaNGA QUEnch and STar formation (ALMaQUEST) survey to investigate the kpc-scale scaling relations, presented as the resolved star-forming MS (rSFMS: ΣSFR versus Σ*), the resolved Schmidt–Kennicutt relation (rSK: ΣSFR versus Σ … Show more

Cited by 16 publications

References 83 publications

The Size–Mass Relation of Post-starburst Galaxies in the Local Universe

The Size–Mass Relation of Post-starburst Galaxies in the Local Universe

The metallicity’s fundamental dependence on both local and global galactic quantities

Resolved Molecular Gas Observations of MaNGA Post-starbursts Reveal a Tumultuous Past

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