Probing gas kinematics and PDR structure around O-type stars in the Sh 2-305 H ii region

Show simple item record Bhadari, Naval Kishor Dewangan, L. K. Zemlyanukha, P. M. Ojha, D. K. Zinchenko, I. I. Sharma, Saurabh
dc.coverage.spatial United Kingdom 2021-12-24T11:50:54Z 2021-12-24T11:50:54Z 2021-12
dc.identifier.citation Bhadari, Naval Kishor; Dewangan, L. K.; Zemlyanukha, P. M.; Ojha, D. K.; Zinchenko, I. I. and Sharma, Saurabh, "Probing gas kinematics and PDR structure around O-type stars in the Sh 2-305 H ii region", The Astrophysical Journal, DOI: 10.3847/1538-4357/ac2a44, vol. 922, no. 2, Dec. 2021 en_US
dc.identifier.issn 0004-637X
dc.identifier.issn 1538-4357
dc.description.abstract We report an observational study of the Galactic H ii region Sh 2-305/S305 using the [C ii] 158 ?m line data, which are used to examine the gas dynamics and structure of photodissociation regions. The integrated [C ii] emission map at [39.4, 49.5] km s?1 spatially traces two shell-like structures (i.e., inner and outer neutral shells) having a total mass of ?565 M?. The inner neutral shell encompasses an O9.5V star at its center and has a compact ring-like appearance. However, the outer shell is seen with more extended and diffuse [C ii] emission, hosting an O8.5V star at its center, and surrounds the inner neutral shell. The velocity channel maps and position�velocity diagrams confirm the presence of a compact [C ii] shell embedded in the diffuse outer shell, and both the shells seem to expand with ${v}_{\exp }\sim 1.3$ km s?1. The outer shell appears to be older than the inner shell, hinting that these shells are formed sequentially. The [C ii] profiles are examined toward S305, which are either double peaked or blue skewed and have the brighter redshifted component. The redshifted and blueshifted components spatially trace the inner and outer neutral shell geometry, respectively. The ionized, neutral, and molecular zones in S305 are seen adjacent to one another around the O-type stars. The regularly spaced dense molecular and dust clumps (mass ?10�103 M?) are investigated around the neutral shells, which might have originated as a result of gravitational instability in the shell of collected materials.
dc.description.statementofresponsibility by Naval Kishor Bhadari, L. K. Dewangan, P. M Zemlyanukha, D. K. Ojha, I. I. Zinchenko and Saurabh Sharma
dc.format.extent vol. 922, no. 2
dc.language.iso en_US en_US
dc.publisher IOP Publishing en_US
dc.subject Observational study en_US
dc.subject Galactic H II region Sh 2-305/S305 en_US
dc.subject Gas dynamics en_US
dc.subject structure of photodissociation regions en_US
dc.title Probing gas kinematics and PDR structure around O-type stars in the Sh 2-305 H ii region en_US
dc.type Article en_US
dc.relation.journal The Astrophysical Journal

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