Keown, Jared, Di Francesco, James ORCID: 0000-0002-9289-2450, Rosolowsky, Erik ORCID: 0000-0002-5204-2259, Singh, Ayushi ORCID: 0000-0001-6022-3618, Figura, Charles, Kirk, Helen ORCID: 0000-0002-5779-8549, Anderson, L. D., Chen, Michael Chun-Yuan, Elia, Davide ORCID: 0000-0002-9120-5890, Friesen, Rachel ORCID: 0000-0001-7594-8128, Ginsburg, Adam, Marston, A., Pezzuto, Stefano ORCID: 0000-0001-7852-1971, Schisano, Eugenio ORCID: 0000-0003-1560-3958, Bontemps, Sylvain, Caselli, Paola, Liu, Hong-Li, Longmore, Steven, Motte, Frederique, Myers, Philip C., Offner, Stella S. R., Sanhueza, Patricio, Schneider, Nicola, Stephens, Ian and Urquhart, James ORCID: 0000-0002-1605-8050 (2019). KFPA Examinations of Young STellar Object Natal Environments (KEYSTONE): Hierarchical Ammonia Structures in Galactic Giant Molecular Clouds. Astrophys. J., 884 (1). BRISTOL: IOP PUBLISHING LTD. ISSN 1538-4357

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Abstract

We present initial results from the K-band Focal Plane Array Examinations of Young STellar Object Natal Environments survey, a large project on the 100m Green Bank Telescope mapping ammonia emission across 11 giant molecular clouds at distances of 0.9-3.0 kpc (Cygnus X North, Cygnus X South, M16, M17, Mon R1, Mon R2, NGC 2264, NGC 7538, Rosette, W3, and W48). This data release includes the NH3 (1,1) and (2,2) maps for each cloud, which are modeled to produce maps of kinetic temperature, centroid velocity, velocity dispersion, and ammonia column density. Median cloud kinetic temperatures range from 11.4 +/- 2.2 K in the coldest cloud (Mon R1) to 23.0 +/- 6.5 K in the warmest cloud (M17). Using dendrograms on the NH3 (1,1) integrated intensity maps, we identify 856 dense gas clumps across the 11 clouds. Depending on the cloud observed, 40%-100% of the clumps are aligned spatially with filaments identified in H2 column density maps derived from spectral energy distribution fitting of dust continuum emission. A virial analysis reveals that 523 of the 835 clumps (63%) with mass estimates are bound by gravity alone. We find no significant difference between the virial parameter distributions for clumps aligned with the dust-continuum filaments and those unaligned with filaments. In some clouds, however, hubs or ridges of dense gas with unusually high mass and low virial parameters are located within a single filament or at the intersection of multiple filaments. These hubs and ridges tend to host water maser emission, multiple 70 mu m detected protostars, and have masses and radii above an empirical threshold for forming massive stars.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Keown, JaredUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Di Francesco, JamesUNSPECIFIEDorcid.org/0000-0002-9289-2450UNSPECIFIED
Rosolowsky, ErikUNSPECIFIEDorcid.org/0000-0002-5204-2259UNSPECIFIED
Singh, AyushiUNSPECIFIEDorcid.org/0000-0001-6022-3618UNSPECIFIED
Figura, CharlesUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kirk, HelenUNSPECIFIEDorcid.org/0000-0002-5779-8549UNSPECIFIED
Anderson, L. D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Chen, Michael Chun-YuanUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Elia, DavideUNSPECIFIEDorcid.org/0000-0002-9120-5890UNSPECIFIED
Friesen, RachelUNSPECIFIEDorcid.org/0000-0001-7594-8128UNSPECIFIED
Ginsburg, AdamUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Marston, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Pezzuto, StefanoUNSPECIFIEDorcid.org/0000-0001-7852-1971UNSPECIFIED
Schisano, EugenioUNSPECIFIEDorcid.org/0000-0003-1560-3958UNSPECIFIED
Bontemps, SylvainUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Caselli, PaolaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Liu, Hong-LiUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Longmore, StevenUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Motte, FrederiqueUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Myers, Philip C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Offner, Stella S. R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Sanhueza, PatricioUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Schneider, NicolaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Stephens, IanUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Urquhart, JamesUNSPECIFIEDorcid.org/0000-0002-1605-8050UNSPECIFIED
URN: urn:nbn:de:hbz:38-131115
DOI: 10.3847/1538-4357/ab3e76
Journal or Publication Title: Astrophys. J.
Volume: 884
Number: 1
Date: 2019
Publisher: IOP PUBLISHING LTD
Place of Publication: BRISTOL
ISSN: 1538-4357
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
HERBIG-HARO OBJECTS; MASS STAR-FORMATION; GOULD BELT SURVEY; GHZ METHANOL MASERS; MONOCEROS OB1; CYGNUS OB2; DENSE GAS; INFRARED OBSERVATIONS; SCUBA-2 OBSERVATIONS; LINE OBSERVATIONSMultiple languages
Astronomy & AstrophysicsMultiple languages
Refereed: Yes
URI: http://kups.ub.uni-koeln.de/id/eprint/13111

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