Star Clusters in a Nuclear Star Forming Ring: The Disappearing String of Pearls

Vaïsänen, P.; Barway, Sudhanshu; Randriamanakoto, Zara

doi:10.1088/2041-8205/797/2/l16

Cited by 15 publications

(15 citation statements)

References 29 publications

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“…Then the young clusters move along the ring, following the gas movement, and meanwhile age, resulting in an age gradient along the ring (e.g. Falcón-Barroso et al 2014;Väisänen et al 2014).…”

Section: Star Formation In the Circumnuclear Ringmentioning

confidence: 99%

Star formation and gas flows in the centre of the NUGA galaxy NGC 1808 observed with SINFONI

Busch

Eckart

Valencia-S.

et al. 2017

A&A

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NGC 1808 is a nearby barred spiral galaxy which hosts young stellar clusters in a patchy circumnuclear ring with a radius of ∼240 pc. In order to study the gaseous and stellar kinematics and the star formation properties of the clusters, we perform seeing-limited H + Kband near-infrared integral-field spectroscopy with SINFONI of the inner ∼600 pc. From the M BH − σ * relation, we find a black hole mass of a few 10 7 M. We estimate the age of the young stellar clusters in the circumnuclear ring to be 10 Myr. No age gradient along the ring is visible. However, the starburst age is comparable to the travel time along the ring, indicating that the clusters almost completed a full orbit along the ring during their lifetime. In the central ∼600 pc, we find a hot molecular gas mass of ∼730 M which, with standard conversion factors, corresponds to a large cold molecular gas reservoir of several 10 8 M , in agreement with CO measurements from the literature. The gaseous and stellar kinematics show several deviations from pure disc motion, including a circumnuclear disc and signs of a nuclear bar potential. In addition, we confirm streaming motions on the ∼200 pc scale that have recently been detected in CO(1-0) emission. Thanks to the enhanced angular resolution of <1 , we find further streaming motion within the inner arcsecond that had not been detected until now. Despite the flow of gas towards the centre, no signs of significant AGN activity are found. This raises the question: will the infalling gas fuel an AGN or star formation?

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Section: Star Formation In the Circumnuclear Ringmentioning

confidence: 99%

Star formation and gas flows in the centre of the NUGA galaxy NGC 1808 observed with SINFONI

Busch

Eckart

Valencia-S.

et al. 2017

A&A

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“…At least one of the LIRGs has its star cluster population disrupted in a mass-dependent manner. A similar case, also using the combination of HST imaging and SALT spectroscopy, is seen in a curious case of SSCs in a starburst ring in a small early type galaxy (see [2,17]). We look for such physically interesting…”

Section: Pos(ssc2015)011mentioning

confidence: 85%

SALT and SUNBIRD: Young massive star clusters and superwinds in strongly star-forming galaxies

Vaïsänen¹,

Ramphul²,

Randriamanakoto³

et al. 2016

Proceedings of SALT Science Conference 2015 — PoS(SSC2015)

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An overview of ongoing research on luminous infrared galaxies, LIRGs, is presented. A sample of approximately 40 such strongly star-forming galaxies have been studied with adaptive optics imaging using VLT and Gemini, and the galaxies then followed-up with a uniform SALT spectroscopic survey. Two different long-slit configurations were used, often with multiple slit orientations. The project investigates the LIRG histories, their stellar populations and abundances, and the gradients thereof, galaxy wide gas inflow and outflows, and their super star cluster population characteristics. Some early results are presented with motivation for the various aspects of this large SALT survey.

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“…This leaves us with option (ii) as the most likely origin of the observed peaked CMF. This initial conclusion was strengthened by the recent study of Väisänen et al (2014), who discovered similar evidence of rapid star cluster disruption in the early-type galaxy NGC 2328.…”

Section: Rapid Star Cluster Evolutionmentioning

confidence: 87%

The NGC 7742 star cluster luminosity function: a population analysis revisited

Grijs¹,

Ma²

2018

Res. Astron. Astrophys.

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We re-examine the properties of the star cluster population in the circumnuclear starburst ring in the face-on spiral galaxy NGC 7742, whose young cluster mass function has been reported to exhibit significant deviations from the canonical power law. We base our reassessment on the clusters' luminosities (an observational quantity) rather than their masses (a derived quantity), and confirm conclusively that the galaxy's starburst-ring clusters-and particularly the youngest subsample, log(t yr −1 ) ≤ 7.2-show evidence of a turnover in the cluster luminosity function well above the 90% completeness limit adopted to ensure the reliability of our results. This confirmation emphasizes the unique conundrum posed by this unusual cluster population.

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Star Clusters in a Nuclear Star Forming Ring: The Disappearing String of Pearls

Cited by 15 publications

References 29 publications

Star formation and gas flows in the centre of the NUGA galaxy NGC 1808 observed with SINFONI

Star formation and gas flows in the centre of the NUGA galaxy NGC 1808 observed with SINFONI

SALT and SUNBIRD: Young massive star clusters and superwinds in strongly star-forming galaxies

The NGC 7742 star cluster luminosity function: a population analysis revisited

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