The impact of merging on the origin of kinematically misaligned and counter-rotating galaxies in MaNGA

Li, Songlin; Shi, Yong; Bizyaev, Dmitry; Duckworth, Christopher; Yan, Renbin; Chen, Yanmei; Bing, L.; Jianhang, Chen; Yu, Xiaoling; Riffel, Rogemar A.

doi:10.1093/mnras/staa3618

Cited by 22 publications

(11 citation statements)

References 71 publications

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“…Our blueberry galaxy has disturbed kinematics, showing a misalignment of ∼ 30 o between the stellar and gaseous kinematic major axes. In general, such kinematic misalignment in galaxies indicates signs of galaxy interaction and merger or external gas accretion (Jaiswal & Omar 2013;van de Voort et al 2015;Jin et al 2016;Paswan et al 2018;Li et al 2021). Furthermore, the study by Lofthouse et al (2017) has also shown an evidence of minor-merger in their two GPs.…”

Section: Discussionmentioning

confidence: 92%

Unveiling an old disk around a massive young leaking blueberry in SDSS-IV MaNGA

Paswan,

Saha,

Borgohain

et al. 2022

Preprint

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Extreme emission-line galaxies, such as blue compact dwarfs (BCDs), Green Peas (GPs) and blueberries in the local Universe are the potential candidates to understand the nature of galaxies that re-ionized the early Universe. Being low-mass, metal-poor starburst systems they are understood as local analogs of the high redshift Lyman Continuum (LyC) and Lymanα emitters (LAEs). Even with their proximity to us, we know little about their spatially resolved properties, most of the blueberries and GPs are indeed compact, remain unresolved. Here, we report the detection of a disk-like lower-surface brightness (LSB) stellar host with very old population around a blueberry LAE system using broad i-band imaging and integral field spectroscopic data from SDSS and SDSS-IV MaNGA surveys, respectively. The LSB stellar host is structurally similar to that observed around local starburst BCDs. Furthermore, the kinematics of the studied blueberry source bear sign of misalignment between the gas and stellar components. Our findings establish an intriguing thread connecting the blueberry and an LSB disk with old stellar population, and suggest that blueberries and their high redshift counterparts such as GPs do not represent peculiar cases of dwarf galaxy evolution. In fact, with respect to the structural properties of their host galaxies, they are compatible with a common evolutionary track of the main population of local BCDs.

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Section: Discussionmentioning

confidence: 92%

Unveiling an old disk around a massive young leaking blueberry in SDSS-IV MaNGA

Paswan,

Saha,

Borgohain

et al. 2022

Preprint

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“…Specifically, Thorp et al (2019) found a centrally-peaked SFR enhancement and general metallicity suppression in MaNGA star-forming post-mergers; while Pan et al (2019) found that the SFR enhancement in SFGs pairs emerges after the first encounter. In addition, morphologically, Li et al (2021) found a higher pair fraction in both SFGs and quiescent galaxies that show misaligned gas-stellar rotation. Feng et al (2020) showed that galaxies in pairs have higher kinematic asymmetry.…”

Section: Introductionmentioning

confidence: 89%

An IFU View of the Active Galactic Nuclei in MaNGA Galaxy Pairs

Jin,

Dai,

Pan

et al. 2021

Preprint

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The role of active galactic nuclei (AGNs) during galaxy interactions and how they influence the star formation in the system are still under debate. We use a sample of 1156 galaxies in galaxy pairs or mergers (hereafter 'pairs') from the MaNGA survey. This pair sample is selected by the velocity offset, projected separation, and morphology, and is further classified into four cases along the merger sequence based on morphological signatures. We then identify a total of 61 (5.5%) AGNs in pairs based on the emission-line diagnostics. No evolution of the AGN fraction is found, either along the merger sequence or compared to isolated galaxies (5.0%). We observe a higher fraction of passive galaxies in galaxy pairs, especially in the pre-merging cases, and associate the higher fraction to their environmental dependence. The isolated AGN and AGN in pairs show similar distributions in their global stellar mass, star formation rate (SFR), and central [O III] surface brightness. AGNs in pairs show radial profiles of increasing specific SFR and declining Dn4000 from center to outskirts, and no significant difference from the isolated AGNs. This is clearly different from star-forming galaxies (SFGs) in our pair sample, which show enhanced central star formation, as reported before. AGNs in pairs have lower Balmer decrements at outer regions, possibly indicating less dust attenuation. Our findings suggest that AGNs likely follow an inside-out quenching and the merger impact on the star formation in AGNs is less prominent than in SFGs.

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“…In the last decades, several formation scenarios of gas-star misalignments have been proposed, including external gas accretion from dwarf companions as well as cosmic webs (Thakar & Ryden 1998;Chen et al 2016;Jin et al 2016), minor/major mergers (Naab et al 2014;Li et al 2020). Recent simulations (Starkenburg et al 2019;Duckworth et al 2020c;Koudmani et al 2021) find a higher incidence of AGN in misaligned galaxies, suggesting AGN feedback also plays a role in the formation of misalignment.…”

Section: Formation Scenarios Of Misaligned Galaxiesmentioning

confidence: 99%

SDSS-IV MaNGA : spatial resolved properties of kinematically misaligned galaxies

Xu,

Chen,

Shi

et al. 2022

Preprint

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We select 456 galaxies with kinematically misaligned gas and stellar components from 9546 parent galaxies in MaNGA, and classify them into 72 star-forming galaxies, 142 green-valley galaxies and 242 quiescent galaxies. Comparing the spatial resolved properties of the misaligned galaxies with control samples closely match in the D 4000 and stellar velocity dispersion, we find that: (1) the misaligned galaxies have lower values in gas / gas and star / star (the ratio between ordered to random motion of gas and stellar components) across the entire galaxies than their control samples; (2) the star-forming and green-valley misaligned galaxies have enhanced central concentrated star formation than their control galaxies. The difference in stellar population between quiescent misaligned galaxies and control samples is small; (3) gas-phase metallicity of the green valley and quiescent misaligned galaxies are lower than the control samples. For the star forming misaligned galaxies, the difference in metallicity between the misaligned galaxies and their control samples strongly depends on how we select the control samples. All these observational results suggest external gas accretion influences the evolution of star forming and green valley galaxies, not only in kinematics/morphologies, but also in stellar populations. However, the quiescent misaligned galaxies have survived from different formation mechanisms.

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The impact of merging on the origin of kinematically misaligned and counter-rotating galaxies in MaNGA

Cited by 22 publications

References 71 publications

Unveiling an old disk around a massive young leaking blueberry in SDSS-IV MaNGA

Unveiling an old disk around a massive young leaking blueberry in SDSS-IV MaNGA

An IFU View of the Active Galactic Nuclei in MaNGA Galaxy Pairs

SDSS-IV MaNGA : spatial resolved properties of kinematically misaligned galaxies

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