Young star clusters in NGC1313 with HST obs. Virtual Observatory Resource

Authors
  1. Messa M.
  2. Calzetti D.
  3. Adamo A.
  4. Grasha K.
  5. Johnson K.E.
  6. Sabbi E.,Smith L.J.
  7. Bajaj V.
  8. Finn M.K.
  9. Lin Z.
  10. Published by
    CDS
Abstract

Using recently acquired Hubble Space Telescope NIR observations (J, Pa{beta}, and H bands) of the nearby galaxy NGC 1313, we investigate the timescales required by a young star cluster to emerge from its natal cloud. We search for extincted star clusters, potentially embedded in their natal cloud as either (1) compact sources in regions with high H{alpha}/Pa{beta} extinctions or (2) compact HII regions that appear as point-like sources in the Pa{beta} emission map. The NUV-optical-NIR photometry of the candidate clusters is used to derive their ages, masses, and extinctions via a least-{chi}^2^ spectral energy distribution broad- and narrowband fitting process. The 100 clusters in the final samples have masses in the range log_10_(M/M_{sun}_)=2.5-3.5 and moderate extinctions, E(B-V)<~1.0mag. Focusing on the young clusters (0-6Myr), we derive a weak correlation between extinction and age of the clusters. Almost half of the clusters have low extinctions, E(B-V)<0.25mag, already at very young ages (<=3Myr), suggesting that dust is quickly removed from clusters. A stronger correlation is found between the morphology of the nebular emission (compact, partial or absent, both in H{alpha} and Pa{beta}) and cluster age. Relative fractions of clusters associated with a specific nebular morphology are used to estimate the typical timescales for clearing the natal gas cloud, resulting in between 3 and 5Myr, ~1Myr older than what was estimated from NUV-optical-based cluster studies. This difference hints at a bias for optical-only-based studies, which James Webb Space Telescope will address in the coming years.

Keywords
  1. open-star-clusters
  2. galaxies
  3. stellar-ages
  4. stellar-masses
  5. extinction
  6. ultraviolet-astronomy
  7. visible-astronomy
  8. infrared-astronomy
Bibliographic source Bibcode
2021ApJ...909..121M
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/909/121
IVOA Identifier IVOID
ivo://CDS.VizieR/J/ApJ/909/121
Document Object Identifer DOI
doi:10.26093/cds/vizier.19090121

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http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/909/121
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https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/909/121/table3?
http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/909/121/table3?

History

2022-09-12T10:02:02Z
Resource record created
2022-09-12T10:02:02Z
Created
2023-09-05T07:31:32Z
Updated

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