The Blanco DECam bulge survey. I. The survey description and early results - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Monthly Notices of the Royal Astronomical Society Année : 2020

The Blanco DECam bulge survey. I. The survey description and early results

R Michael Rich
Christian Johnson
  • Fonction : Auteur
Michael Young
  • Fonction : Auteur
Iulia Simion
  • Fonction : Auteur
William Clarkson
  • Fonction : Auteur
Catherine Pilachowski
  • Fonction : Auteur
Scott Michael
  • Fonction : Auteur
Andrea Kunder
  • Fonction : Auteur
A Katherina vivas
  • Fonction : Auteur
Tommaso Marchetti
  • Fonction : Auteur
Rodrigo A Ibata
Nicolas F. Martin
Annie Robin
Michelle Collins
Željko Ivezić
  • Fonction : Auteur
Roberto De propris
  • Fonction : Auteur
Juntai Shen
  • Fonction : Auteur
Ortwin Gerhard
  • Fonction : Auteur
Mario Soto
  • Fonction : Auteur

Résumé

The Blanco Dark Energy Camera (DECam) Bulge survey is a Vera Rubin Observatory (LSST) pathfinder imaging survey, spanning ∼200 deg 2 of the Southern Galactic bulge, −2 • < b < −13 • and −11 • < l < +11 •. We have employed the CTIO-4 m telescope and the DECam to image a contiguous ∼200 deg 2 region of the relatively less reddened Southern Galactic bulge, in SDSS u + Pan-STARRSgrizy. Optical photometry with its large colour baseline will be used to investigate the age and metallicity distributions of the major structures of the bulge. Included in the survey footprint are 26 globular clusters imaged in all passbands. Over much of the bulge, we have Gaia DR2 matching astrometry to i ∼ 18, deep enough to reach the faint end of the red clump. This paper provides the background, scientific case, and description of the survey. We present an array of new reddening-corrected colour-magnitude diagrams that span the extent of Southern Galactic bulge. We argue that a population of massive stars in the blue loop evolutionary phase, proposed to lie in the bulge, are instead at ∼2 kpc from the Sun and likely red clump giants in the old disc. A bright red clump near (l, b) = (+ 8 • , −4 •) may be a feature in the foreground disc, or related to the long bar reported in earlier work. We also report the first map of the blue horizontal branch population spanning the Blanco DECam Bulge Survey field of regard, and our data do not confirm the reality of a number of proposed globular clusters in the bulge.
Fichier principal
Vignette du fichier
staa2426.pdf (12.29 Mo) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte

Dates et versions

hal-03095370 , version 1 (04-01-2021)

Identifiants

Citer

R Michael Rich, Christian Johnson, Michael Young, Iulia Simion, William Clarkson, et al.. The Blanco DECam bulge survey. I. The survey description and early results. Monthly Notices of the Royal Astronomical Society, 2020, 499 (2), pp.2340-2356. ⟨10.1093/mnras/staa2426⟩. ⟨hal-03095370⟩
82 Consultations
25 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More