Universidade de Lisboa – Faculdade de Ciências, Centro de Astronomia e Astrofísica da Universidade de Lisboa, Observatório Astronómico de Lisboa, Tapada da Ajuda, 1349-018 Lisboa, Portugal e-mail: email@example.com
2 Departament d'Astronomia i Meteorologia, Facultat de Física, Planta 7a, Universitat de Barcelona, Avenida Diagonal 647, 08028 Barcelona, Spain e-mail: firstname.lastname@example.org
3 Instituto de Ciencias del Espacio (CSIC) and Institut d'Estudis Espacials de Catalunya, Facultat de Física, Planta 7a, Universitat de Barcelona, Avenida Diagonal 647, 08028 Barcelona, Spain e-mail: email@example.com
Accepted: 16 May 2007
Aims.We report the discovery of a new young stellar cluster and molecular cloud located in the far outer Galaxy, seen towards IRAS 06361-0142, and we characterise their properties.
Methods.Near-infrared images obtained with VLT/ISAAC through s filters, millimetre line observations of CO(1-0) obtained with SEST, and VLA 6 cm continuum maps obtained from archive data.
Results.The cloud and cluster are located at a distance of 7 kpc and a Galactocentric distance of 15 kpc, well in the far outer Galaxy. Morphologically, IRAS 06361-0142 appears as a cluster of several tens of stars surrounded by a nearly spherical nebular cavity centred at the position of the IRAS source. The cluster appears composed of low and intermediate-mass, young reddened stars with a large fraction having cleared the inner regions of their circumstellar discs responsible for (s) colour excess. The observations are compatible with a 4 Myr cluster with variable spatial extinction between Av=6 and Av=13.
Key words: stars: formation / ISM: clouds / stars: pre-main sequence / ISM: dust, extinction / infrared: stars
© ESO, 2007