Integral field spectroscopy of luminous infrared main-sequence galaxies at cosmic noon

Hogan, L.; Rigopoulou, D.; Magdis, G.; Pereira-Santaella, M.; García-Bernete, I.; Thatte, Niranjan; Grisdale, Kearn; Huang, Jia-Sheng

doi:10.1093/mnras/stab527

Cited by 10 publications

(19 citation statements)

References 128 publications

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“…A large variety of objects covering a wide range in redshifts (1 z 6) and galaxy properties have been identified using different criteria (e.g., stellar mass, far-IR luminosity, or optical compactness). These systems can be mainly classified as (i) compact MS SFGs (Barro et al 2014(Barro et al , 2016, (ii) MS SFGs (Straatman et al 2015;Tadaki et al 2017;Förster Schreiber et al 2018;Puglisi et al 2019Puglisi et al , 2021Kaasinen et al 2020;Fujimoto et al 2020;Wilman et al 2020;Cheng et al 2020;Valentino et al 2020;Hogan et al 2021), and (iii) extreme SMGs, which mostly lie in the upper envelope of the MS plane (Lang et al 2019;Chen et al 2017Chen et al , 2020Calistro Rivera et al 2018;Hodge et al 2016;Gullberg et al 2018). According to this classification, some of the so-called MS galaxies mentioned here can also include a few galaxies lying slightly off the MS (e.g., Tadaki et al 2017;Puglisi et al 2019;Kaasinen et al 2020;Valentino et al 2020): we should consider these systems as lying approximately on the MS at their corresponding redshift.…”

Section: Introductionmentioning

confidence: 99%

Compact molecular gas emission in local LIRGs among low- and high-z galaxies

Bellocchi

Pereira-Santaella

Colina

et al. 2022

A&A

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We present new CO(2–1) observations of a representative sample of 24 local (z < 0.02) luminous infrared galaxies (LIRGs) at high spatial resolution (< 100 pc) from the Atacama Large Millimeter/submillimeter Array (ALMA). Our LIRGs lie above the main sequence (MS), with typical stellar masses in the range 1010–1011 M⊙ and SFR ∼ 30 M⊙ yr−1. We derive the effective radii of the CO(2–1) and the 1.3 mm continuum emissions using the curve-of-growth method. LIRGs show an extremely compact cold molecular gas distribution (median RCO ∼ 0.7 kpc), which is a factor 2 smaller than the ionized gas (median RHα ∼ 1.4 kpc), and 3.5 times smaller than the stellar size (median Rstar ∼ 2.4 kpc). The molecular size of LIRGs is similar to that of early-type galaxies (ETGs; RCO ∼ 1 kpc) and about a factor of 6 more compact than local spiral galaxies of similar stellar mass. Only the CO emission in low-z ULIRGs is more compact than these local LIRGs by a factor of 2. Compared to high-z (1 < z < 6) systems, the stellar sizes and masses of local LIRGs are similar to those of high-z MS star-forming galaxies (SFGs) and about a factor of 2–3 lower than submillimeter (submm) galaxies (SMGs). The molecular sizes of high-z MS SFGs and SMGs are larger than those derived for LIRGs by a factor of ∼3 and ∼8, respectively. Contrary to high-z SFGs and SMGs, which have comparable molecular and stellar sizes (median Rstar/RCO = 1.8 and 1.2, respectively), local LIRGs show more centrally concentrated molecular gas distribution (median Rstar/RCO = 3.3). A fraction of the low-z LIRGs and high-z galaxies share a similar range in the size of the ionized gas distribution, from 1 to 4 kpc. However, no LIRGs with a very extended (above 4 kpc) radius are identified, while for high-z galaxies no compact (less than 1 kpc) emission is detected. These results indicate that while low-z LIRGs and high-z MS SFGs have similar stellar masses and sizes, the regions of current star formation (traced by the ionized gas) and of potential star formation (traced by the molecular gas) are substantially smaller in LIRGs, and constrained to the central kiloparsec (kpc) region. High-z galaxies represent a wider population but their star-forming regions are more extended, even covering the entire extent of the galaxy. High-z galaxies have larger fractions of gas than low-z LIRGs, and therefore the formation of stars could be induced by interactions and mergers in extended disks or filaments with sufficiently large molecular gas surface density involving physical mechanisms similar to those identified in the central kpc of LIRGs.

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Section: Introductionmentioning

confidence: 99%

Compact molecular gas emission in local LIRGs among low- and high-z galaxies

Bellocchi

Pereira-Santaella

Colina

et al. 2022

A&A

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“…Farrah et al 2008 ;Muzzin et al 2010 ), physical properties and morphologies (e.g. Kartaltepe et al 2012 ;Hogan et al 2021 ). High-resolution studies have revealed that the star-forming regions of highz U/LIRGs are relatively extended with sizes of the of order 3-16 kpc (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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“…A large variety of objects covering a wide range in redshifts (1 z 6) and galaxy properties have been identified using different criteria (e.g., stellar mass, far-IR luminosity or optical compactness). These systems can be mainly classified as (i) compact main-sequence (MS) SFGs (Barro et al 2014, Barro et al 2016), (ii) MS SFGs (Straatman et al 2015, Tadaki et al 2017, Förster Schreiber et al 2018, Puglisi et al 2019, Kaasinen et al 2020, Fujimoto et al 2020, Wilman et al 2020, Cheng et al 2020, Valentino et al 2020and Hogan et al 2021) and the (iii) extreme SMGs, which mostly lie in the upper envelope of the MS plane (Lang et al 2019, Chen et al 2017, Chen et al 2020, Calistro Rivera et al 2018, Hodge et al 2016, Gullberg et al 2018. According to this classification, some of the so-called MS galaxies here mentioned can also include a few galaxies lying slightly off the MS (e.g., Tadaki et al 2017;Puglisi et al 2019;Kaasinen et al 2020;Valentino et al 2020): we should consider these systems to belong 'around' the MS at their corresponding redshift.…”

Section: Introductionmentioning

confidence: 99%

Compact molecular gas emission in local LIRGs among low- and high-z galaxies

Bellocchi,

Pereira-Santaella,

Colina

et al. 2022

Preprint

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We present new CO(2-1) observations of a representative sample of 24 local (z<0.02) luminous infrared galaxies (LIRGs) at high spatial resolution (<100 pc) from the Atacama Large Millimeter/submillimeter Array (ALMA). Our LIRGs lie above the Main-Sequence (MS), with typical stellar masses in the range 10 10 -10 11 M and SFR∼30 M yr −1 . We derive the effective radii of the CO(2-1) and the 1.3 mm continuum emissions using the curve-of-growth method. LIRGs show an extremely compact cold molecular gas distribution (median R CO ∼0.7 kpc), which is a factor 2 smaller than the ionized gas (median R Hα ∼1.4 kpc), and 3.5 times smaller than the stellar size (median R star ∼2.4 kpc). The molecular size of LIRGs is similar to that of early-type galaxies (ETGs; R CO ∼1 kpc) and about a factor of 6 more compact than local Spirals of similar stellar mass. Only the CO emission in low-z ULIRGs is more compact than these local LIRGs by a factor of 2. Compared to high-z (1

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Integral field spectroscopy of luminous infrared main-sequence galaxies at cosmic noon

Cited by 10 publications

References 128 publications

Compact molecular gas emission in local LIRGs among low- and high-z galaxies

Compact molecular gas emission in local LIRGs among low- and high-z galaxies

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

Compact molecular gas emission in local LIRGs among low- and high-z galaxies

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