A dataset provided by the European Space Agency

Name OT2_aboogert_2
Title Herschel Spectroscopy of Spitzer.s "Extended Green Objects": Tracing the Earliest Stages of Massive Star Formation
URL

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DOI 10.5270/esa-m3isi1e
Author boogert, a.
Description Massive star formation remains a poorly understood phenomenon, largely due to the difficulty of identifying and studying massive young stellar objects (MYSOs) in the crucial early active accretion and outflow phase. Large-scale Spitzer surveys of the Galactic Plane have yielded a promising new sample of young MYSOs with outflows, which are likely actively accreting: based on their extended 4.5 um emission in Spitzer images, these sources are known as "Extended Green Objects (EGOs)" from the common coding of three-color IRAC images. Extensive ground-based follow up observations revealed that the EGOs are indeed related to massive outflows from young systems with very high accretion rates (10^-3 Msun-year). They also revealed a wide variety of properties: some MYSOs appear in clusters, others are isolated, some are molecular line rich, others not. To test the hypothesis that these differences reflect evolutionary effects, we propose SPIRE-FTS and HIFI observations of 4 EGOs. SPIRE-FTS spectra of the 12CO and 13CO rotational ladders and HIFI spectra of selected CO line profiles would yield shock-excited gas temperatures and masses, constraining the current outflow (and thus accretion) activity in a more direct way than is possible in low excitation tracers with ground-based telescopes. HIFI observations of H2O and NH3 line profiles and abundances would provide independent present day outflow activity indicators and records of the shock history, as these species are formed above temperatures of 230 and 4000 K, respectively, and preserved in the post-shock gas. This unique Herschel data set would also address outstanding questions about the disputed origin of the Spitzer "green" emission, interstellar H2O-NH3 abundance ratios, and the role of outflow feedback in models of cluster formation.
Publication
Instrument HIFI_HifiPoint_dbs, SPIRE_SpireSpectrometer_
Temporal Coverage 2012-09-29T10:06:17Z/2013-03-12T07:00:55Z
Version SPG v14.1.0
Mission Description 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 ┬Ám range, bridging the gap between earlier infrared space missions and groundbased facilities.
Creator Contact https://support.cosmos.esa.int/herschel/
Date Published 2013-09-12T06:30:37Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, 2013-09-12T06:30:37Z, OT2_aboogert_2, SPG v14.1.0. https://doi.org/10.5270/esa-m3isi1e