Optical integral field spectroscopy of intermediate redshift infrared bright galaxies

Pereira-Santaella, M.; Rigopoulou, D.; Magdis, G.; Thatte, Niranjan; Alonso‐Herrero, A.; Clarke, Frazer; Farrah, D.; García‐Burillo, S.; Hogan, L.; Morris, Simon L.; Rodrigues, M.; Huang, Jia-Sheng; Tecza, M.

doi:10.1093/mnras/stz1218

Cited by 8 publications

(7 citation statements)

References 81 publications

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“…Molina et al (2020),Cochrane et al (2021), and KMOS 3D individual targets; stellar masses of LIRGs and ULIRGs from this study, fromBellocchi et al (2013), Pereira-Santaella et al (2019 andCrespo et al (2021), are instead derived from the dynamical mass estimates, assuming M * = (1− f gas )×(1− f DM )× M dyn , where f gas and f DM are the gas and dark matter fractions 4 , respectively, and M dyn is the dynamical mass within 2R e (see next section). For the gas fraction, we considered a conservative f gas = 0.1(Isbell et al 2018; higher f gas values would further increase their δMS).…”

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confidence: 99%

Physics of ULIRGs with MUSE and ALMA: The PUMA project

Perna

Arribas

Colina

et al. 2022

A&A

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Context. A classical scenario suggests that ultra-luminous infrared galaxies (ULIRGs) transform colliding spiral galaxies into a spheroid-dominated early-type galaxy. Recent high-resolution simulations have instead shown that, under some circumstances, rotation disks can be preserved during the merging process or rapidly regrown after coalescence. Our goal is to analyse in detail the ionised gas kinematics in a sample of ULIRGs to infer the incidence of gas rotational dynamics in late-stage interacting galaxies and merger remnants. Aims. We analysed integral field spectrograph MUSE data of a sample of 20 nearby (z < 0.165) ULIRGs (with 29 individual nuclei) as part of the Physics of ULIRGs with MUSE and ALMA (PUMA) project. We used multi-Gaussian fitting techniques to identify gaseous disk motions and the 3D-Barolo tool to model them. Methods. We found that 27% (8 out of 29) individual nuclei are associated with kiloparsec-scale disk-like gas motions. The rest of the sample displays a plethora of gas kinematics, dominated by winds and merger-induced flows, which makes the detection of rotation signatures difficult. On the other hand, the incidence of stellar disk-like motions is ∼2 times larger than gaseous disks, as the former are probably less affected by winds and streams. The eight galaxies with a gaseous disk present relatively high intrinsic gas velocity dispersion (σ0 ∈ [30 − 85] km s−1), rotationally supported motions (with gas rotation velocity over velocity dispersion vrot/σ0 ∼ 1 − 8), and dynamical masses in the range (2 − 7)×1010 M⊙. By combining our results with those of local and high-z disk galaxies (up to z ∼ 2) from the literature, we found a significant correlation between σ0 and the offset from the main sequence (δMS), after correcting for their evolutionary trends. Results. Our results confirm the presence of kiloparsec-scale rotating disks in interacting galaxies and merger remnants in the PUMA sample, with an incidence going from 27% (gas) to ≲50% (stars). Their gas σ0 is up to a factor of ∼4 higher than in local normal main sequence galaxies, similar to high-z starbursts as presented in the literature; this suggests that interactions and mergers enhance the star formation rate while simultaneously increasing the velocity dispersion in the interstellar medium.

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confidence: 99%

Physics of ULIRGs with MUSE and ALMA: The PUMA project

Perna

Arribas

Colina

et al. 2022

A&A

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“…Our six targets, FLS02 (2 merging galaxies), CDFS1 (2 merging galaxies), SWIRE7, and SWIRE5, were selected from the sample of intermediate redshift U/LIRGs presented in Magdis et al ( 2014 ;hereafter M14 ), Rigopoulou et al ( 2014 ), andPereira-Santaella et al ( 2019 ;hereafter PS19 ). Details of the targets are given in Tables 1 and 3 .…”

Section: The Samplementioning

confidence: 99%

“…At intermediate redshifts (0.2 < z < 1) U/LIRGs have properties that resemble both the highz and local U/LIRGs. Intermediatez U/LIRGs appear to be a mixture of interacting and isolated objects, can have a lower dust temperatures than local U/LIRGs, b ut ha ve a similar level of dust obscuration (Pereira-Santaella et al 2019 ). They can have an SFE, dust and interstellar medium (ISM) that exhibits characteristics that more closely resemble regular starforming galaxies than local U/LIRGs (e.g.…”

Section: Introductionmentioning

confidence: 99%

Unveiling the main sequence to starburst transition region with a sample of intermediate redshift luminous infrared galaxies

Hogan

Rigopoulou

García‐Burillo

et al. 2022

Monthly Notices of the Royal Astronomical Society

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We present a CO(3-2) study of four systems composed of six (ultra) luminous infrared galaxies (U/LIRGs), located at 0.28 < z < 0.44, that straddle the transition region between regular star forming galaxies and starbursts. These galaxies benefit from previous multi-wavelength analysis allowing in depth exploration of an understudied population of U/LIRGs at a time when the universe is experiencing a rapid decline in star formation rate density. We detect CO(3-2) emission in four targets and these galaxies fall between the loci of regular star forming galaxies and starbursts on the Kennicutt-Schmidtt relation. Compared to low luminosity LIRGs and high luminosity ULIRGs at similar redshifts, we find they all have similar molecular gas budgets with the difference in their star formation rates (SFR) driven by the star formation efficiency (SFE). This suggests that at these redshifts large molecular gas reservoirs must coincide with an increased SFE to transition a galaxy into the starburst regime. We studied the structure and kinematics and found our four detections are either interacting or have disturbed morphology which may be driving the SFE. One of the CO(3-2) non-detections has a strong continuum detection, and has been previously observed in Hα, suggesting an unusual interstellar medium for a ULIRG. We conclude that our sample of transitioning U/LIRGs fill the gap between regular star forming galaxies and starbursts, suggest a continuous change in SFE between these two populations and the increased SFE may be driven by morphology and differing stages of interaction.

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“…At intermediate redshifts (0.2 < z < 1) U/LIRGs have properties that resemble both the high-z and local U/LIRGs. Intermediate-z U/LIRGs appear to be a mixture of interacting and isolated objects, can have a lower dust temperatures than local U/LIRGs, but have a similar level of dust obscuration (Pereira-Santaella et al 2019). They can have an SFE, dust and interstellar medium (ISM) that exhibits characteristics that more closely resemble regular star forming galaxies than local U/LIRGs (e.g.…”

Section: Introductionmentioning

confidence: 99%

Unveiling the Main Sequence to Starburst Transition Region with a Sample of Intermediate Redshift Luminous Infrared Galaxies

Hogan,

Rigopoulou,

García-Burillo

et al. 2022

Preprint

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We present a CO(3-2) study of four systems composed of six (ultra) luminous infrared galaxies (U/LIRGs), located at 0.28 < z < 0.44, that straddle the transition region between regular star forming galaxies and starbursts. These galaxies benefit from previous multi-wavelength analysis allowing in depth exploration of an understudied population of U/LIRGs at a time when the universe is experiencing a rapid decline in star formation rate density. We detect CO(3-2) emission in four targets and these galaxies fall between the loci of regular star forming galaxies and starbursts on the Kennicutt-Schmidtt relation. Compared to low luminosity LIRGs and high luminosity ULIRGs at similar redshifts, we find they all have similar molecular gas budgets with the difference in their star formation rates (SFR) driven by the star formation efficiency (SFE). This suggests that at these redshifts large molecular gas reservoirs must coincide with an increased SFE to transition a galaxy into the starburst regime. We studied the structure and kinematics and found our four detections are either interacting or have disturbed morphology which may be driving the SFE. One of the CO(3-2) non-detections has a strong continuum detection, and has been previously observed in H𝛼, suggesting an unusual interstellar medium for a ULIRG. We conclude that our sample of transitioning U/LIRGs fill the gap between regular star forming galaxies and starbursts, suggest a continuous change in SFE between these two populations and the increased SFE may be driven by morphology and differing stages of interaction.

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Optical integral field spectroscopy of intermediate redshift infrared bright galaxies

Cited by 8 publications

References 81 publications

Physics of ULIRGs with MUSE and ALMA: The PUMA project

Physics of ULIRGs with MUSE and ALMA: The PUMA project

Unveiling the main sequence to starburst transition region with a sample of intermediate redshift luminous infrared galaxies

Unveiling the Main Sequence to Starburst Transition Region with a Sample of Intermediate Redshift Luminous Infrared Galaxies

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