Young and embedded clusters in Cygnus-X: evidence for building up the initial mass function? - INSU - Institut national des sciences de l'Univers Access content directly
Journal Articles Monthly Notices of the Royal Astronomical Society Year : 2016

Young and embedded clusters in Cygnus-X: evidence for building up the initial mass function?

Abstract

We provide a new view on the Cygnus-X north complex by accessing for the first time the low mass content of young stellar populations in the region. Canada-France-Hawaii Telescope/Wide-Field Infrared Camera was used to perform a deep near-infrared survey of this complex, sampling stellar masses down to ∼0.1 M. Several analysis tools, including a extinction treatment developed in this work, were employed to identify and uniformly characterize a dozen unstudied young star clusters in the area. Investigation of their mass distributions in low-mass domain revealed a relatively uniform log-normal initial mass function (IMF) with a characteristic mass of 0.32 ± 0.08 M and mass dispersion of 0.40 ± 0.06. In the high-mass regime, their derived slopes showed that while the youngest clusters (age < 4 Myr) presented slightly shallower values with respect to the Salpeter's, our older clusters (4 Myr < age < 18 Myr) showed IMF compliant values and a slightly denser stellar population. Although possibly evidencing a deviation from an `universal' IMF, these results also supports a scenario where these gas-dominated young clusters gradually `build up' their IMF by accreting low-mass stars formed in their vicinity during their first ∼3 Myr, before the gas expulsion phase, emerging at the age of ∼4 Myr with a fully fledged IMF. Finally, the derived distances to these clusters confirmed the existence of at least three different star-forming regions throughout Cygnus-X north complex, at distances of 500-900 pc, 1.4-1.7 and 3.0 kpc, and revealed evidence of a possible interaction between some of these stellar populations and the Cygnus OB2 association.
Fichier principal
Vignette du fichier
stw450.pdf (20.55 Mo) Télécharger le fichier
Origin Publisher files allowed on an open archive

Dates and versions

insu-03691545 , version 1 (09-06-2022)

Identifiers

Cite

F. F. S. Maia, E. Moraux, I. Joncour. Young and embedded clusters in Cygnus-X: evidence for building up the initial mass function?. Monthly Notices of the Royal Astronomical Society, 2016, 458, pp.3027-3046. ⟨10.1093/mnras/stw450⟩. ⟨insu-03691545⟩
12 View
6 Download

Altmetric

Share

Gmail Mastodon Facebook X LinkedIn More