Harris, A., I, Guesten, R., Requena-Torres, M. A., Riquelme, D., Morris, M. R., Stacey, G. J., Martin-Pintado, J., Stutzki, J., Simon, R., Higgins, R. and Risacher, C. (2021). SOFIA-upGREAT Imaging Spectroscopy of the [C ii] 158 mu m Fine-structure Line of the Sgr B Region in the Galactic Center. Astrophys. J., 921 (1). BRISTOL: IOP Publishing Ltd. ISSN 1538-4357
Full text not available from this repository.Abstract
We report SOFIA-upGREAT spectroscopic imaging of the [C ii] 158 mu m spectral line, as well as a number of [O i] 63 mu m spectra, across a 67 x 45 pc field toward the Sgr B region in our Galactic center. The fully sampled and velocity-resolved [C ii] images have 0.55 pc spatial and 1 km s(-1) velocity resolutions. We find that Sgr B extends as a coherent structure spanning some 34 pc along the Galactic plane. Bright [C ii] emission encompasses Sgr B1 (G0.5-0.0) and the G 0.6-0.0 H ii region and passes behind and beyond the luminous star-forming cores toward Sgr B2 (G0.7-0.0). Sgr B is a major contributor to the entire Galactic center's [C ii] luminosity, with surface brightness comparable to [C ii] from the Arches region. [C ii], 70 mu m, and 20 cm emissions share nearly identical spatial distributions. Combined with the lack of [C ii] self-absorption, this indicates that these probes trace UV on the near surfaces of more extended clouds visible in CO isotopologues and 160 mu m continuum. Stars from regions of local star formation likely dominate the UV field. Photodissociation regions and H ii regions contribute similar amounts of [C ii] flux. The extreme star formation cores of Sgr B2 contribute negligible amounts to the total [C ii] intensity from the Sgr B region. Velocity fields and association with a narrow dust lane indicate that they may have been produced in a local cloud-cloud collision. The cores are likely local analogs of the intense star formation regions where ideas to explain the C+ deficit in ultraluminous galaxies can be tested.
| Item Type: | Journal Article | ||||||||||||||||||||||||||||||||||||||||||||||||
| Creators: |
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| URN: | urn:nbn:de:hbz:38-600110 | ||||||||||||||||||||||||||||||||||||||||||||||||
| DOI: | 10.3847/1538-4357/ac1863 | ||||||||||||||||||||||||||||||||||||||||||||||||
| Journal or Publication Title: | Astrophys. J. | ||||||||||||||||||||||||||||||||||||||||||||||||
| Volume: | 921 | ||||||||||||||||||||||||||||||||||||||||||||||||
| Number: | 1 | ||||||||||||||||||||||||||||||||||||||||||||||||
| Date: | 2021 | ||||||||||||||||||||||||||||||||||||||||||||||||
| Publisher: | IOP Publishing Ltd | ||||||||||||||||||||||||||||||||||||||||||||||||
| Place of Publication: | BRISTOL | ||||||||||||||||||||||||||||||||||||||||||||||||
| ISSN: | 1538-4357 | ||||||||||||||||||||||||||||||||||||||||||||||||
| Language: | English | ||||||||||||||||||||||||||||||||||||||||||||||||
| Faculty: | Unspecified | ||||||||||||||||||||||||||||||||||||||||||||||||
| Divisions: | Unspecified | ||||||||||||||||||||||||||||||||||||||||||||||||
| Subjects: | no entry | ||||||||||||||||||||||||||||||||||||||||||||||||
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| URI: | http://kups.ub.uni-koeln.de/id/eprint/60011 |
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