|Probing Star Formation in the Extreme Environment of Onsala 2
|One of the closest massive star-forming regions known, and surprisingly one of the least studied, is the Onsala 2 (ON2) complex in Cygnus at d = 1.2 kpc. The ON2 region shows numerous signs of active high-mass star-formation including OH masers, compact and ultracompact HII regions, and luminous molecular outflows. A unique feature of ON2 is that it harbors the rare and remarkable Wolf-Rayet star WR 142, a strong UV source whose hypersonic wind is driving shock waves throughout the region. We propose to conduct the first comprehensive IR study of ON2 using PACS and SPIRE, supplemented by existing Spitzer IRAC-MIPS data and high resolution Chandra X-ray data. This study will build on (and complement) our X-ray study of ON2 already in progress. Our primary goal is to develop a broad picture of how star-formation is proceeding in ON2 and to identify environmental factors that may be affecting it (e.g. ionization and shocks associated with HII regions and WR 142). We will identify and classify all IR-excess YSOs, including the population of embedded sources and low-mass YSOs about which little is yet known. We will determine if filamentary structures containing YSOs are present and will use information on the spatial distribution of YSOs relative to strong ionizing sources to search for evidence of triggered star formation. Aperture photometry will provide information on the physical properties of individual YSOs and a dust temperature map of ON2. Steep temperature gradients are expected near strong ionizing HII regions, one of which is known to be a source of hard diffuse X-rays. We also propose to obtain targeted SPIRE FTS spectroscopy of the massive YSO IRAS 20198+3716 to determine properties of the gas in its vicinity.
|The Herschel SPIRE Fourier Transform Spectrometer Spectral Feature Finder - II. Estimating radial velocity of SPIRE spectral observation sources . Scott Jeremy P. et al. . Monthly Notices of the Royal Astronomical Society . null . null . 2020MNRAS.496.4894S ,
The Herschel SPIRE Fourier Transform Spectrometer Spectral Feature Finder - III. Line identification and off-axis spectra . Benson Chris S. et al. . Monthly Notices of the Royal Astronomical Society . null . null . 2020MNRAS.496.4906B ,
The Herschel SPIRE Fourier Transform Spectrometer Spectral Feature Finder I. The Spectral Feature Finder and Catalogue . Hopwood R. et al. . Monthly Notices of the Royal Astronomical Society . null . null . 2020MNRAS.496.4874H ,
|Herschel was launched on 14 May 2009! It is the fourth 'cornerstone' mission in the ESA science programme. With a 3.5 m Cassegrain telescope it is the largest space telescope ever launched. It is performing photometry and spectroscopy in approximately the 55-671 µm range, bridging the gap between earlier infrared space missions and groundbased facilities.
|Publisher And Registrant
|European Space Agency
|European Space Agency, 2013, OT2_sskinner_1, SPG v14.1.0. https://doi.org/10.5270/esa-c5o3ehz