The filamentary structure of the interface between the atomic and the molecular phases in NGC 7023.

Details The filamentary structure of the interface between the atomic and the molecular phases in NGC 7023. The filamentary structure of the interface between the atomic and the molecular phases in NGC 7023.

Jun 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...310..286f&link_type=abstract

Astronomy and Astrophysics, v.310, p.286-296

Astronomy and Astrophysics

Astrophysics

21

Stars: Hd 200775, Stars: Pre-Main Sequence, Ism: Clouds, Ism: Ngc 7023, Ism: Molecules, Ism: Reflection Nebulae

Scientific paper

The combination of interferometric and single-dish data allow us, for the first time, to determine the intimate structure of the photodissociation region associated with the prototypical reflection nebula NGC 7023. We have mapped the J=1->0 HCO^+^ line using the IRAM millimeter interferometer and the 30-m single dish telescope, and the 21cm HI line using the Very Large Array of NRAO. The interferometric HCO^+^ data show the existence of four high density molecular filaments with different velocities (1.9km/s, 2.4km/s, 2.9km/s, 4.0km/s) located at the interface between the atomic and the molecular gas. An additional filament has been tentatively detected at 5.8km/s. From the comparison between the single-dish and the interferometric HCO^+^ data with HI emission, we derive that the filament at 4.0km/s and, very likely, that at 5.8km/s are located on the inner walls of the HI clump, immersed in an atomic medium, while those at 1.9 and 2.4km/s are immersed in the molecular cloud. The filament at 2.9km/s would be located in an intermediate zone. The thickness of the filaments are ~6" and the derived densities vary between 10^5^ and a few 10^6^cm^-3^. The molecular filaments match perfectly the infrared filaments found at 2.1μm, suggesting that infrared and millimeter data are probing regions with enhanced hydrogen density.

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