High-resolution imaging of photodissociation regions in NGC 6334

M. G. Burton, M. C.B. Ashley, R. D. Marks, A. E. Schinckel, J. W.V. Storey, A. Fowler, M. Merrill, N. Sharp, I. Gatley, D. A. Harper, R. F. Loewenstein, F. Mrozek, J. M. Jackson, K. E. Kraemer

Research output: Contribution to journalArticlepeer-review

32 Scopus citations

Abstract

We have used the SPIREX telescope to conduct a wide-field thermal infrared imaging study of the star formation complex NGC 6334 in the southern Galactic plane. We imaged a 30′ region along the main star-forming ridge of NGC 6334 with 0″.6 pixel scale through broadband filters for L (3.5 μm) and M (4.8 μm) and through narrowband filters for the H2 υ = 1-0 Q-branch (2.42 μm), polycyclic aromatic hydrocarbon (PAH) (3.3 μm), and Brα (4.05 μm) lines. The images reveal the spectacular, complex structure of the photodissociation regions (PDRs) that pervade the region, with enhanced line emission around each of the seven sites of massive star formation along the ridge. Bubbles and loops of PAH emission, typically 1-1.5 pc across, have been carved out of the parent molecular cloud by the intense UV radiation from the massive stars and surround H II regions (seen in Brα) typically 0.2-0.3 pc across. The PAH emission regions coincide with both [C II] 158 μm line emission, indicating that the PAHs are excited in PDR gas, and extensive H2 emission, which therefore must be fluorescent. However, the textures of the emission regions in PAH and H2 are different. This is attributable to variations in the physical environment in which the gas is excited. Several compact reddened objects are observed; these are likely to be massive protostars.

Original languageEnglish (US)
Pages (from-to)359-366
Number of pages8
JournalAstrophysical Journal
Volume542
Issue number1 PART 1
DOIs
StatePublished - Oct 10 2000
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Keywords

  • ISM: molecules
  • ISM: structure
  • Infrared: ISM: lines and bands
  • Infrared: general
  • Stars: formation
  • Telescopes

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