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High-resolution Observations of H i in the IC 63 Reflection Nebula

Bonne, L and Andersson, B-G and Minchin, R and Soam, A and Yaldaei, J and Kulas, K and Karoly, J and Knee, LBG and Kumar, S and Roy, N (2023) High-resolution Observations of H i in the IC 63 Reflection Nebula. In: Astronomical Journal, 165 (6).

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Official URL: https://doi.org/10.3847/1538-3881/accf85


Photodissociation regions (PDRs), where the (far-)ultraviolet light from hot young stars interact with the gas in surrounding molecular clouds, provide laboratories for understanding the nature and role of feedback by star formation on the interstellar medium. While the general nature of PDRs is well understood—at least under simplified conditions—the detailed dynamics and chemistry of these regions, including gas clumping, evolution over time, etc., can be very complex. We present interferometric observations of the 21 cm atomic hydrogen line, combined with [C ii] 158 μm observations, toward the nearby reflection nebula IC 63. We find a clumpy H i structure in the PDR, and a ring morphology for the H i emission at the tip of IC 63. We further unveil kinematic substructure, of the order of 1 km s−1, in the PDR layers and several legs that will disperse IC 63 in <0.5 Myr. We find that the dynamics in the PDR explain the observed clumpy H i distribution and lack of a well-defined H i/H2 transition front. However, it is currently not possible to conclude whether H i self-absorption and nonequilibrium chemistry also contribute to this clumpy morphology and missing H i/H2 transition front.

Item Type: Journal Article
Publication: Astronomical Journal
Publisher: American Astronomical Society
Additional Information: The copyright for this article belongs to the author.
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 09 Jul 2023 17:34
Last Modified: 09 Jul 2023 17:34
URI: https://eprints.iisc.ac.in/id/eprint/82086

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