Integral field spectroscopy of Green Peas – I. Disentangling disc-like turbulence and strong outflow kinematics in SDSS J083843.63+385350.5

Bosch, G.; Hägele, G. F.; Amorín, R.; Firpo, V.; Cardaci, M. V.; Vı́lchez, J. M.; Pérez-Montero, E.; Papaderos, P.; Dors, O. L.; Krabbe, Â. C.; Campuzano-Castro, F.

doi:10.1093/mnras/stz2230

Cited by 32 publications

(36 citation statements)

References 93 publications

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“…However, we can argue that it is likely that turbulent motions dominate the global kinematics of J 1429. Comparison with deep GEMINI-GMOS IFU observations of another GP with similar integrated properties from our WHT-ISIS dataset presented by Bosch, et al (2019) shows a quantitatively similar kinematic structure, i.e. narrow, mid-width, and broad components with similar σ values.…”

Section: Are Gps Dispersion Dominated?supporting

confidence: 65%

“…Recently, Bosch, et al (2019) presented spatiallyresolved, high-dispersion IFU data of the GP J 0820, which shows a similar multi-component structure in all the emission lines probed in their study. The authors discuss the presence of broad and mid-width Gaussian components, with average FWHM∼ 400 and 250km s −1 respectively.…”

Section: Turbulent Mixing Layersmentioning

confidence: 63%

“…The implications of this result will be discuss later in Section 5. Table 3 details the peak velocity and velocity dispersion for each component in the adopted model for [O iii] λ5007 and Hα, as well as the peak position and full width at zero intensity (FWZI) of the broad component model, defined as the width of the profile where the model falls within 1σ of the continuum level (A12b, Bosch, et al 2019).…”

Section: Resultsmentioning

confidence: 99%

“…narrow, mid-width, and broad components with similar σ values. While the global profile is certainly dispersion dominated, the narrow component in Bosch, et al (2019) shows a uniform velocity dispersion of σ ∼ 40km s −1 and line-of-sight velocities consistent with a perturbed disk, showing evidence of rotation. In previous IFU studies Lofthouse et al (2017) also found evidence of dispersion-dominated disks in a sample of four GPs, two of them showing no evidence of merging and similarly high integrated velocity dispersion.…”

Section: Are Gps Dispersion Dominated?mentioning

confidence: 98%

“…We note however that these IFU studies do not include multicomponent analysis of the emission lines, in some cases precluded by a limited velocity resolution, limited S/N, or both. As shown in Bosch, et al (2019), the presence of multiple unresolved components may dilute or mask-out a rotation pattern in the disk components. Therefore, we conclude that systematic high S/N spatially resolved, high-dispersion spectroscopy is essential to elucidate the true dynamical state of GPs.…”

Section: Are Gps Dispersion Dominated?mentioning

confidence: 99%

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Chemodynamics of green pea galaxies – I. Outflows and turbulence driving the escape of ionizing photons and chemical enrichment

Hogarth

Amorín

Vı́lchez

et al. 2020

Monthly Notices of the Royal Astronomical Society

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We investigate the ionised gas kinematics, physical properties and chemical abundances of SDSS J142947, a Green Pea galaxy at redshift z∼ 0.17 with strong, doublepeak Lyα emission and indirect evidence of Lyman continuum (LyC) leakage. Using high-dispersion spectroscopy, we perform a multi-component analysis of emission-line profiles. Our model consistently fits all lines as a narrow component with intrinsic velocity dispersion σ ∼ 40 km s −1 , and two broader blue-shifted components with σ ∼ 90 km s −1 and ∼ 250 km s −1 . We find electron densities and temperatures, ionisation conditions, and direct O/H and N/O abundances for each component. A highly ionised, metal-poor, young and compact starburst dominates narrow emission, showing evidence of hard radiation fields and elevated N/O. The blue-shifted broader components are consistent with highly turbulent, possibly clumpy ionised gas at the base of a strong photoionised outflow, which accounts for 50% of the integrated emission-line fluxes. The outflow is dense and metal-enriched compared to the H ii regions, with expansion velocities larger than those obtained from UV interstellar absorption lines under standard assumptions. Some of these metals may be able to escape, with outflows loading factors comparable to those found in high-z galaxies of similar SFR/Area. Our findings depict a two-stage starburst picture; hard radiation fields from young star clusters illuminate a turbulent and clumpy ISM that has been eroded by SNe feedback. While UV data suggest an extended Lyα halo with high average H i column density, LyC photons could only escape from SDSS J142947 through low H i density channels or filaments in the ISM approaching density-bounded conditions, traced by outflowing gas.

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Section: Are Gps Dispersion Dominated?supporting

confidence: 65%

Section: Turbulent Mixing Layersmentioning

confidence: 63%

Section: Resultsmentioning

confidence: 99%

Section: Are Gps Dispersion Dominated?mentioning

confidence: 98%

Section: Are Gps Dispersion Dominated?mentioning

confidence: 99%

See 3 more Smart Citations

Chemodynamics of green pea galaxies – I. Outflows and turbulence driving the escape of ionizing photons and chemical enrichment

Hogarth

Amorín

Vı́lchez

et al. 2020

Monthly Notices of the Royal Astronomical Society

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Unexplored outflows in nearby low luminosity AGNs

Cazzoli

Hermosa-Muñoz

Márquez

et al. 2022

A&A

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Context. Multi-phase outflows play a central role in galaxy evolution shaping the properties of galaxies. Understanding outflows and their effects in low luminosity active galactic nuclei (AGNs), such as low ionisation nuclear emission line regions (LINERs), is essential. LINERs bridge the gap between normal and active galaxies, being the most numerous AGN population in the local Universe. Aims. Our goal is to analyse the kinematics and ionisation mechanisms of the multi-phase gas of NGC 1052, the prototypical LINER, in order to detect and map the ionised and neutral phases of the putative outflow. Methods. We obtained Very Large Telescope MUSE and Gran Telescopio Canarias MEGARA optical integral field spectroscopy data for NGC 1052. In addition to stellar kinematics maps, by modelling spectral lines with multiple Gaussian components, we obtained flux, kinematic, and excitation maps of both ionised and neutral gas. Results. The stars are distributed in a dynamically hot disc (V/σ ∼ 1.2), with a centrally peaked velocity dispersion map (σc = 201 ± 10 km s−1) and large observed velocity amplitudes (ΔV = 167 ± 19 km s−1). The ionised gas, probed by the primary component is detected up to ∼30″ (∼3.3 kpc) mostly in the polar direction with blue and red velocities (∣V∣ < 250 km s−1). The velocity dispersion map shows a notable enhancement (σ > 90 km s−1) crossing the galaxy along the major axis of rotation in the central 10″. The secondary component has a bipolar morphology, velocity dispersion larger than 150 km s−1, and velocities up to 660 km s−1. A third component is detected with MUSE (and barely with MEGARA), but it is not spatially resolved. The broad-line region (BLR) component (used to model the broad Hα emission only) has a full width at half maximum of 2427 ± 332 and 2350 ± 470 km s−1 for MUSE and MEGARA data, respectively. The maps of the NaD absorption indicate optically thick neutral gas with complex kinematics. The velocity field is consistent with a slow rotating disc (ΔV = 77 ± 12 km s−1), but the velocity dispersion map is off-centred without any counterpart in the (centrally peaked) flux map. Conclusions. We found evidence of an ionised gas outflow (secondary component) with a mass of 1.6 ± 0.6 × 105 M⊙, and mass rate of 0.4 ± 0.2 M⊙ yr−1. The outflow is propagating in a cocoon of gas with enhanced turbulence and might be triggering the onset of kiloparsec-scale buoyant bubbles (polar emission), both probed by the primary component. Taking into account the energy and kinetic power of the outflow (1.3 ± 0.9 × 1053 erg and 8.8 ± 3.5 × 1040 erg s−1, respectively) as well as its alignment with both the jet and the cocoon, and that the gas is collisionally ionised (due to gas compression), we consider that the most likely power source of the outflow is the jet, although some contribution from the AGN is possible. The hints of the presence of a neutral gas outflow are weak.

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Characterisation of the stellar content of SDSS EELGs through self-consistent spectral modelling

Breda

Vı́lchez

Papaderos

et al. 2022

A&A

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Extreme emission line galaxies (EELGs) are a notable galaxy genus, ultimately being regarded as local prototypes of early galaxies at the cosmic noon. Robust characterisation of their stellar content, however, is hindered by the exceptionally high nebular emission present in their optical spectroscopic data. This study is dedicated into recovering the stellar properties of a sample of 414 EELGs as observed by the SDSS Survey. Such is achieved by means of the spectral synthesis code FADO, which self-consistently considers the stellar and nebular emission in an optical spectrum. Additionally, a comparative analysis was carried on, by further processing the EELGs sample with the purely stellar spectral synthesis code STARLIGHT, and by extending the analysis to a sample of 697 normal star-forming galaxies, expected to be less affected by nebular contribution. We find that, for both galaxy samples, stellar mass and mean age estimates by STARLIGHT are systematically biased towards higher values, and that an adequate determination of the physical and evolutionary properties of EELGs via spectral synthesis is only possible when nebular continuum emission is taken into account. Moreover, the differences between the two population synthesis codes can be ascribed to the degree of star-formation activity through the specific star-formation rate and the sum of the flux of the most prominent emission lines. As expected, on the basis of the theoretical framework, our results emphasise the importance of considering the nebular emission while performing spectral synthesis, even for galaxies hosting typical levels of star-formation activity.

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Integral field spectroscopy of Green Peas – I. Disentangling disc-like turbulence and strong outflow kinematics in SDSS J083843.63+385350.5

Cited by 32 publications

References 93 publications

Chemodynamics of green pea galaxies – I. Outflows and turbulence driving the escape of ionizing photons and chemical enrichment

Chemodynamics of green pea galaxies – I. Outflows and turbulence driving the escape of ionizing photons and chemical enrichment

Unexplored outflows in nearby low luminosity AGNs

Characterisation of the stellar content of SDSS EELGs through self-consistent spectral modelling

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