<> "The repository administrator has not yet configured an RDF license."^^ . <> . . "Revealing the secrets of Westerlund 2 - A young massive star cluster observed with the Hubble Space Telescope"^^ . "We present a detailed study of the Galactic young massive star cluster Westerlund 2 (Wd2) using an optical and near-infrared high resolution multi-band survey observed with the Hubble Space Telescope. Images obtained in Hα and Paβ filters allowed us to derive a high-resolution pixel-to-pixel E(B − V)_g gas extinction map. This map helped us to individually deredden the stellar photometry, to identify the cluster population, and to determine the properties of Wd2, such as distance (d = 4.16 kpc), total-to-selective extinction (RV = 3.95), and age (1.04 ± 0.72Myr). We identified 240 bona fide pre-main-sequence Hα excess emitters indicating active disk accretion. A careful analysis of the radial dependence of the Hα excess emission shows a 60% lower mass accretion rate in the cluster center, indicating a more rapid disk dispersal in close proximity to the massive OB-stars. We performed state-of-the-art artificial star tests to study the completeness-corrected spatial distribution of the stars. This revealed that Wd2 consists of two subclusters. Additionally, we determined the present-day mass function (PDMF) with a slope of G = −1.53 ± 0.05, which translates to a total\r\nstellar cluster mass of (3.6±0.3)·10^4 M_sun. The spatial analysis of the PDMF and the young age of Wd2 indicates that the cluster is, most likely primordial, mass segregated. A spatially uniformly distributed low-mass (< 0.15 M_sun) population, extending into the gas and dust cloud, as well as a confined region of reddened stars, most likely caused by a foreground CO cloud, suggests that cloud-cloud collision might be the origin of the formation of Wd2."^^ . "2017" . . . . . . . "Peter"^^ . "Zeidler"^^ . "Peter Zeidler"^^ . . . . . . "Revealing the secrets of Westerlund 2 - A young massive star cluster observed with the Hubble Space Telescope (PDF)"^^ . . . "PhD_Thesis_final.pdf"^^ . . . "Revealing the secrets of Westerlund 2 - A young massive star cluster observed with the Hubble Space Telescope (Other)"^^ . . . . . . "indexcodes.txt"^^ . . . "Revealing the secrets of Westerlund 2 - A young massive star cluster observed with the Hubble Space Telescope (Other)"^^ . . . . . . "lightbox.jpg"^^ . . . "Revealing the secrets of Westerlund 2 - A young massive star cluster observed with the Hubble Space Telescope (Other)"^^ . . . . . . "preview.jpg"^^ . . . "Revealing the secrets of Westerlund 2 - A young massive star cluster observed with the Hubble Space Telescope (Other)"^^ . . . . . . "medium.jpg"^^ . . . "Revealing the secrets of Westerlund 2 - A young massive star cluster observed with the Hubble Space Telescope (Other)"^^ . . . . . . "small.jpg"^^ . . "HTML Summary of #22559 \n\nRevealing the secrets of Westerlund 2 - A young massive star cluster observed with the Hubble Space Telescope\n\n" . "text/html" . . . "520 Astronomie"@de . "520 Astronomy and allied sciences"@en . .