Cygnus OB2 Complex survey with Subaru HSC

DOI

Low-mass star formation inside massive clusters is crucial to understand the effect of cluster environment on processes like circumstellar disc evolution, planet, and brown dwarf formation. The young massive association of Cygnus OB2, with a strong feedback from massive stars, is an ideal target to study the effect of extreme environmental conditions on its extensive low-mass population. We aim to perform deep multiwavelength studies to understand the role of stellar feedback on the IMF, brown dwarf fraction and circumstellar disc properties in the region. We introduce here, the deepest and widest optical photometry of 1.5{deg} diameter region centred at Cygnus OB2 in r_2_, i_2_, z, and Y-filters, using Subaru Hyper Suprime-Cam (HSC). This work presents the data reduction, source catalogue generation, data quality checks, and preliminary results about the pre-main sequence sources. We obtain 713529 sources in total, with detection down to ~28, 27, 25.5, and 24.5 mag in r_2_, i_2_, z, and Y-band, respectively, which is ~ 3 - 5 mag deeper than the existing Pan-STARRS and GTC/OSIRIS photometry. We confirm the presence of a distinct pre-main sequence branch by statistical field subtraction of the central 18 arcmin region. We find the median age of the region as ~5 +/- 2 Myr with an average disc fraction of ~9 per cent. At this age, combined with A_V_ ~ 6 - 8 mag, we detect sources down to a mass range of ~0.01-0.17 M_{sun}_. The deep HSC catalogue will serve as the groundwork for further studies on this prominent active young cluster.

Cone search capability for table J/MNRAS/508/3388/table4 (* table of HSC catalogue data)

Identifier
DOI http://doi.org/10.26093/cds/vizier.75083388
Source https://dc.g-vo.org/rr/q/lp/custom/CDS.VizieR/J/MNRAS/508/3388
Related Identifier https://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/508/3388
Related Identifier http://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/508/3388
Metadata Access http://dc.g-vo.org/rr/q/pmh/pubreg.xml?verb=GetRecord&metadataPrefix=oai_b2find&identifier=ivo://CDS.VizieR/J/MNRAS/508/3388
Provenance
Creator Gupta S.; Jose J.; More S.; Das S.R.; Herczeg G.J.; Samal M.R.; Guo Z.,Prakash P.; Damian B.; Takami M.; Takahashi S.; Ogura K.; Terai T.,Pyo T.-S.
Publisher CDS
Publication Year 2024
Rights https://cds.unistra.fr/vizier-org/licences_vizier.html
OpenAccess true
Contact CDS support team <cds-question(at)unistra.fr>
Representation
Resource Type Dataset; AstroObjects
Discipline Astrophysics and Astronomy; Natural Sciences; Observational Astronomy; Physics; Stellar Astronomy