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Name: Naval Kishor Bhadari Affiliation: Physical Research Laboratory Conference ID: ASI2020_189 Title : FILAMENT WITH END-DOMINATED COLLAPSE IN THE MONOCEROS R1 COMPLEX Authors and Co-Authors : N. K. Bhadari, L. K. Dewangan, D. K. Ojha, and L. E. Pirogov Abstract Type : Oral Abstract Category : Stars, ISM and Galaxy Abstract : The filamentary features are commonly observed in star-forming regions. To study the role of filaments in star-formation process, we have carried out an analysis of multi-wavelength data of a star-forming complex Mon R1 (d ∼760 pc). The Herschel column density map reveals an elongated filamentary feature (length ∼12 pc) in the complex. The molecular line data ( 12 CO(1–0) and 13 CO(1–0)) confirm the existence of an isolated and a single filamentary feature, which is traced in a velocity range of [-7.8, 1.3] km/s . Several Herschel dust clumps are also investigated along with the filamentary feature. One end of the Herschel filament hosts the reflection nebula IC 447, while the other end contains the star-forming site IC 446. The Herschel temperature map shows the extended warm dust emission toward both the ends of the filament. IC 446 is known to host a massive young stellar object (i.e., VY Mon), while IC 447 harbors several B-type stars. The Spitzer ratio map ([4.5 μm]/[3.6 μm]) suggests the presence of photo-dissociation regions toward IC 447, while the signature of outflow activity is found toward IC 446. Our observational results together suggest that the star-formation activities are concentrated mainly at both the ends of the filamentary feature. All these results are consistent with the outcome of a model of the end-dominated collapse caused by the higher accelerations of gas. The observational examples of such end-dominated collapse candidates are limited in the literature. Hence, considering our observational results, the Mon R1 filament is the promising example of an end-dominated collapse. |