The Massive Star-forming Regions Omnibus X-ray Catalog, Second Installment
Astrophysical Journal Supplement
American Astronomical Society / IOP Publishing
© 2018. The American Astronomical Society. All rights reserved.
We present the second installment of the Massive Star-forming Regions (MSFRs) Omnibus X-ray Catalog (MOXC2), a compilation of X-ray point sources detected in Chandra/ACIS observations of 16 Galactic MSFRs and surrounding elds. MOXC2 includes 13 ACIS mosaics, three containing a pair of unrelated MSFRs at di erent distances, with a total catalog of 18,396 point sources. The MSFRs sampled range over distances of 1.3 kpc to 6 kpc and populations varying from single massive protostars to the most massive Young Massive Cluster known in the Galaxy. By carefully detecting and removing X-ray point sources down to the faintest statistically-signi cant limit, we facilitate the study of the remaining unresolved X-ray emission. Through comparison with mid-infrared images that trace photon-dominated regions and ionization fronts, we see that the unresolved X-ray emission is due primarily to hot plasmas threading these MSFRs, the result of feedback from the winds and supernovae of massive stars. The 16 MSFRs studied in MOXC2 more than double the MOXC1 sample, broadening the parameter space of ACIS MSFR explorations and expanding Chandra's substantial contribution to contemporary star formation science.
This work was supported by Chandra X-ray Observatory general observer grants GO3- 14002X, GO5-16015X, and GO6-17132X (PI: L. Townsley), and GO9-0155X (PI: Bryan Gaensler), and by the Penn State ACIS Instrument Team Contract SV4-74018. All of these were issued by the Chandra X-ray Center, which is operated by the Smithsonian Astrophysical Observatory for and on behalf of NASA under contract NAS8-03060. The ACIS Guaranteed Time Observations included here were selected by the ACIS Instrument Principal Investigator, Gordon P. Garmire, of the Huntingdon Institute for X-ray Astronomy, LLC, which is under contract to the Smithsonian Astrophysical Observatory; Contract SV2-82024. M.S.P. is supported by the National Science Foundation through grant CAREER-1454333. T.N. was supported for the nal part of this work through a Leverhulme Trust Research Project Grant. This research used data products from the Chandra Data Archive, software provided by the Chandra X-ray Center in the application package CIAO, and SAOImage DS9 software developed by the Smithsonian Astrophysical Observatory. This research also used data products from the Spitzer Space Telescope, operated by the Jet Propulsion Laboratory (California Institute of Technology) (JPL/CalTech) under a contract with NASA, and data products from the Wide- eld Infrared Survey Explorer (WISE), which is a joint project of the University of California, Los Angeles and JPL/CalTech, funded by NASA. This research used NASA's Astrophysics Data System Bibliographic Services, and the SIMBAD database and VizieR catalog access tool provided by CDS, Strasbourg, France.
This is the author accepted manuscript. The final version is available from American Astronomical Society / IOP Publishing via the DOI in this record.
Vol. 235 (2). Published online 23 April 2018.