Early formation and recent starburst activity in the nuclear disk of the Milky Way

Nogueras-Lara, F.; Schödel, R.; Gallego-Calvente, A. T.; Gallego-Cano, E.; Shahzamanian, B.; Dong, Hui; Neumayer, Nadine; Hilker, M.; Najarro, F.; Nishiyama, Shogo; Feldmeier-Krause, A.; Girard, J.; Cassisi, S.

doi:10.1038/s41550-019-0967-9

Cited by 112 publications

(169 citation statements)

References 43 publications

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“…Recent work on the NSD by Nogueras-Lara et al (2020), points towards a mainly old stellar population (>80% of the mass older than 8 Gyr) and an important star-formation event ∼1 Gyr ago (>5% of the mass), implying a double RC sequence in the CMDs (see Fig. 1 of Nogueras-Lara et al 2020). Nogueras-Lara et al (2019b) analysed in detail the central ∼1700 pc 2 of the GALACTICNUCLEUS survey.…”

Section: Slopes Of the Rc Featurementioning

confidence: 95%

“…Instead, we used an alternative approach computing the critical distance at which a star of any magnitude might be detected around a given brighter star (Eisenhauer et al 1998). This allows us to account for completeness due to crowding, which dominates the incompleteness in the highly crowded regions studied (Nogueras-Lara et al 2020). We considered the central region of the GALAC-TICNUCLEUS survey as a test case.…”

Section: Completeness Effectmentioning

confidence: 99%

“…The Galactic centre (GC) is roughly delimited by the disc-like structure of the nuclear stellar disc (NSD) and the central molecular zone (e.g. Morris & Serabyn 1996;Launhardt et al 2002;Kruijssen et al 2014;Nogueras-Lara et al 2020). It hosts a supermassive black hole, Sgr A*, in its dynamical centre that is embedded in a nuclear star cluster (e.g.…”

Section: Introductionmentioning

confidence: 99%

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GALACTICNUCLEUS: A high angular-resolution JHK_s imaging survey of the Galactic centre

Nogueras-Lara

Schödel

Neumayer

et al. 2020

A&A

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Context. The characterisation of the extinction curve in the near-infrared (NIR) is fundamental to analysing the structure and stellar population of the Galactic centre (GC), whose analysis is hampered by the extreme interstellar extinction (AV ~ 30 mag) that varies on arc-second scales. Recent studies indicate that the behaviour of the extinction curve might be more complex than previously assumed, pointing towards a variation of the extinction curve as a function of wavelength. Aims. We aim to analyse the variations of the extinction index, α, with wavelength, line-of-sight, and absolute extinction, extending previous analyses to a larger area of the innermost regions of the Galaxy. Methods. We analysed the whole GALACTICNUCLEUS survey, a high-angular resolution (~0.2″) JHKs NIR survey specially designed to observe the GC in unprecedented detail. It covers a region of ~6000 pc2, comprising fields in the nuclear stellar disc, the inner bulge, and the transition region between them. We applied two independent methods based on red clump (RC) stars to constrain the extinction curve and analysed its variation superseding previous studies. Results. We used more than 165 000 RC stars and increased the size of the regions analysed significantly to confirm that the extinction curve varies with the wavelength. We estimated a difference Δα = 0.21 ± 0.07 between the obtained extinction indices, αJH = 2.44 ± 0.05 and αHKs = 2.23 ± 0.05. We also concluded that there is no significant variation of the extinction curve with wavelength, with the line-of-sight or the absolute extinction. Finally, we computed the ratios between extinctions, AJ∕AH = 1.87 ± 0.03 and AH/AKs = 1.84 ± 0.03, consistent with all the regions of the GALACTICNUCLEUS catalogue.

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Section: Slopes Of the Rc Featurementioning

confidence: 95%

Section: Completeness Effectmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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GALACTICNUCLEUS: A high angular-resolution JHK_s imaging survey of the Galactic centre

Nogueras-Lara

Schödel

Neumayer

et al. 2020

A&A

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“…This constitutes the first survey of the central regions of our Galaxy with ∼10 mag dynamic range in three bands in the near infrared (NIR). Several papers that use the GALACTICNUCLEUS survey and show its potential have already been published (Nogueras-Lara et al 2018a,b, 2019b or submitted (Nogueras-Lara et al 2019a;Gallego-Cano et al 2018).…”

Section: Introductionmentioning

confidence: 99%

GALACTICNUCLEUS: A high-angular-resolution JHK_s imaging survey of the Galactic centre

Nogueras-Lara

Schödel

Gallego-Calvente

et al. 2019

A&A

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Context. The high extinction and extreme source crowding of the central regions of the Milky Way are serious obstacles to the study of the structure and stellar population of the Galactic centre (GC). Existing surveys that cover the GC region (2MASS, UKIDSS, VVV, SIRIUS) do not have the necessary high angular resolution. Therefore, a high-angular-resolution survey in the near infrared is crucial to improve the state of the art. Aims. Here, we present the GALACTICNUCLEUS catalogue, a near infrared JHKs high-angular-resolution (0.2″) survey of the nuclear bulge of the Milky Way. Methods. We explain in detail the data reduction, data analysis, calibration, and uncertainty estimation of the GALACTICNUCLEUS survey. We assess the data quality comparing our results with previous surveys. Results. We obtained accurate JHKs photometry for ∼3.3 × 106 stars in the GC detecting around 20% in J, 65% in H, and 90% in Ks. The survey covers a total area of ∼0.3 deg2, which corresponds to ∼6000 pc2. The GALACTICNUCLEUS survey reaches 5σ detections for J ∼ 22 mag, H ∼ 21 mag, and Ks ∼ 21 mag. The uncertainties are below 0.05 mag at J ∼ 21 mag, H ∼ 19 mag, and Ks ∼ 18 mag. The zero point systematic uncertainty is ≲0.04 mag in all three bands. We present colour–magnitude diagrams for the different regions covered by the survey.

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“…The star formation history of the central 150 pc of the Milky Way is likely not quasi-continuous but has a number of intense star formation periods with the latest one at about several tens of millions of years ago (see e.g. Nogueras-Lara et al 2019).…”

Section: High-energy Phenomena In the Galactic Center And The Centralmentioning

confidence: 99%

High-Energy Particles and Radiation in Star-Forming Regions

et al. 2020

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Non-thermal particles and high-energy radiation can play a role in the dynamical processes in star-forming regions and provide an important piece of the multiwavelength observational picture of their structure and components. Powerful stellar winds and supernovae in compact clusters of massive stars and OB associations are known to be favourable sites of high-energy particle acceleration and sources of non-thermal radiation and neutrinos. Namely, young massive stellar clusters are likely sources of the PeV (petaelectronvolt) regime cosmic rays (CRs). They can also be responsible for the cosmic ray composition, e.g., 22 Ne/ 20 Ne anomalous isotopic ratio in CRs. Efficient particle acceleration can be accompanied by super-adiabatic amplification of the fluctuating magnetic fields in the systems converting a part of kinetic power of the winds and supernovae into the magnetic energy through the CR-driven instabilities. The escape and CR propagation in the vicinity of the sources are affected by the non-linear CR feedback. These effects are expected to be important in starburst galaxies, which produce high-energy neutrinos and gamma-rays. We give a brief review of the theoreti-A. M. Bykov

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Early formation and recent starburst activity in the nuclear disk of the Milky Way

Cited by 112 publications

References 43 publications

GALACTICNUCLEUS: A high angular-resolution JHK_s imaging survey of the Galactic centre

GALACTICNUCLEUS: A high angular-resolution JHK_s imaging survey of the Galactic centre

GALACTICNUCLEUS: A high-angular-resolution JHK_s imaging survey of the Galactic centre

High-Energy Particles and Radiation in Star-Forming Regions

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Early formation and recent starburst activity in the nuclear disk of the Milky Way

Cited by 112 publications

References 43 publications

GALACTICNUCLEUS: A high angular-resolution JHKs imaging survey of the Galactic centre

GALACTICNUCLEUS: A high angular-resolution JHKs imaging survey of the Galactic centre

GALACTICNUCLEUS: A high-angular-resolution JHKs imaging survey of the Galactic centre

High-Energy Particles and Radiation in Star-Forming Regions

Contact Info

Product

Resources

About

GALACTICNUCLEUS: A high angular-resolution JHK_s imaging survey of the Galactic centre

GALACTICNUCLEUS: A high angular-resolution JHK_s imaging survey of the Galactic centre

GALACTICNUCLEUS: A high-angular-resolution JHK_s imaging survey of the Galactic centre