|Completing the Herschel Survey of Cygnus-X
|Massive stars are rare and distant. Their short-lived protostellar phases are therefore difficult to study, and the processes that produce them are not well understood. The Cygnus-X complex is one of the richest known regions of star formation in the Galaxy at a distance of virgul1.3 kpc, which allows it to be studied at smaller scales and less confusion than other similarly active regions that are more distant. We have conducted a Spitzer Legacy survey of the Cygnus-X region and used the data to map the distribution of Class I and II YSOs in the complex, and have begun to study the interaction between the massive young stars and clusters of low-mass YSOs. We propose to use PACS and SPIRE to complete an unbiased survey in the Cygnus-X region to detect the intermediate to high-mass young stellar objects, pre-stellar cores, and infrared dark clouds (IRDCs) and their embedded objects. The Herschel observations, in conjunction with the existing Spitzer, near-IR, and other ancillary datasets will allow us to assemble a comprehensive picture of star formation in this high mass, extremely active complex. With the Herschel data we will 1) complete the sample of massive protostars and YSOs in Cygnus-X and construct SEDs of the objects from 1 to 1200 microns, 2) use the derived luminosities and envelope masses from the sample to construct evolutionary diagrams and test high-mass star formation models, 3) analyze the population of Infrared Dark Clouds in Cygnus-X, and 4) explore the role of massive stars in triggering star formation in surrounding clouds. The data will provide a useful resource for the study of star formation for years to come.
|Investigating the Covering Fraction Distribution of Swift-BAT AGNs with X-Ray and Infrared Observations . Lanz Lauranne et al. . The Astrophysical Journal . null . null . 2019ApJ...870...26L ,
Surveys of Clumps, Cores, and Condensations in Cygnus X. I. A New Catalog of ∼0.1 pc Massive Dense Cores . Cao Yue et al. . The Astrophysical Journal Supplement Series, Volume 241, Issue 1, article id. 1, 42 pp. (2019). . 241 . 10.3847/1538-4365/ab0025 . 2019ApJS..241....1C ,
Star-Gas Surface Density Correlations in 12 Nearby Molecular Clouds. I. Data Collection and Star-sampled Analysis . Pokhrel Riwaj et al. . The Astrophysical Journal . null . null . 2020ApJ...896...60P ,
|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_jhora_2, SPG v14.2.0. https://doi.org/10.5270/esa-4ukirwh