The discovery of a molecular cavity in the Norma near arm associated to H.E.S.S γ-ray source located in the direction of Westerlund 1.

dc.creatorABRAHAM LUNA CASTELLANOS
dc.creatorYALIA DIVAKARA MAYYA
dc.creatorLUIS CARRASCO BAZUA
dc.date2010
dc.date.accessioned2023-07-25T16:23:50Z
dc.date.available2023-07-25T16:23:50Z
dc.identifierhttp://inaoe.repositorioinstitucional.mx/jspui/handle/1009/1528
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/7806724
dc.descriptionWe report on the discovery of a molecular cavity in the Norma near arm in the general direction of Westerlund 1 (Wd1), but not associated with it. The cavity has a mean radial velocity of −91.5 kms⁻¹, which differs by as much as ∼40 kms⁻¹ from the mean radial velocity of the Wd1 stars. The cavity is sur- rounded by a fragmented molecular shell of an outer diameter of about 100 pc and 10⁶M⊙, which is expanding at velocities of 6 to 8 kms⁻¹. The amount of kinetic energy involved in the expanding shell is ∼10⁵¹ erg. Inside this cavity the atomic HI gas surface density is also the lowest. Structure of the extended Very High Energetic (VHE) γ-ray emission, recently reported by the H.E.S.S. collaboration (Ohm et al. 2009), coincides with the cavity. The observed morphology suggests that the inner wall of the molecular shell is the zone of the γ-ray emission, and not the dense gas surrounding massive stars of Wd1 as had been speculated by the H.E.S.S. collaboration. A likely candidate responsible for creating the observed cavity and the γ-ray emission is the pulsar PSR J1648-4611.
dc.formatapplication/pdf
dc.languageeng
dc.publisherThe Astrophysical Journal Letters
dc.relationcitation:Luna Castellanos, Abraham, et al., (2010), The discovery of a molecular cavity in the Norma near arm associated to H.E.S.S γ-ray source located in the direction of Westerlund 1, The Astrophysical Journal Letters, Vol. 713(1):L45–L49.
dc.rightsinfo:eu-repo/semantics/openAccess
dc.rightshttp://creativecommons.org/licenses/by-nc-nd/4.0
dc.subjectinfo:eu-repo/classification/Inspec/Gamma Rays: observations
dc.subjectinfo:eu-repo/classification/Inspec/ISM: Molecules
dc.subjectinfo:eu-repo/classification/Inspec/ISM: clouds
dc.subjectinfo:eu-repo/classification/Inspec/ISM: structure
dc.subjectinfo:eu-repo/classification/Inspec/Open clusters and associations: individual (Westerlund 1)
dc.subjectinfo:eu-repo/classification/cti/1
dc.subjectinfo:eu-repo/classification/cti/21
dc.subjectinfo:eu-repo/classification/cti/21
dc.titleThe discovery of a molecular cavity in the Norma near arm associated to H.E.S.S γ-ray source located in the direction of Westerlund 1.
dc.typeinfo:eu-repo/semantics/article
dc.typeinfo:eu-repo/semantics/acceptedVersion
dc.audiencestudents
dc.audienceresearchers
dc.audiencegeneralPublic


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