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Dusty globules in the Crab Nebula
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.
Stockholm Observatory, AlbaNova University Centre, Stockholm University.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Energy Science.
Number of Authors: 3
2017 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 599, A110Article in journal (Refereed) Published
Abstract [en]

Context. Dust grains are widespread in the Crab Nebula. A number of small, dusty globules, are visible as dark spots against the background of continuous synchrotron emission in optical images. Aims. Our aim is to catalogue such dusty globules and investigate their properties. Methods. From existing broad-band images obtained with the Hubble Space Telescope, we located 92 globules, for which we derived positions, dimensions, orientations, extinctions, masses, proper motions, and their distributions. Results. The globules have mean radii ranging from 400 to 2000 AU and are not resolved in current infrared images of the nebula. The extinction law for dust grains in these globules matches a normal interstellar extinction law. Derived masses of dust range from 1 to 60 × 10-6M, and the total mass contained in globules constitute a fraction of approximately 2% or less of the total dust content of the nebula. The globules are spread over the outer part of the nebula, and a fraction of them coincide in position with emission filaments, where we find elongated globules that are aligned with these filaments. Only 10% of the globules are coincident in position with the numerous H2-emitting knots found in previous studies. All globules move outwards from the centre with transversal velocities of 60 to 1600 km s-1, along with the general expansion of the remnant. We discuss various hypotheses for the formation of globules in the Crab Nebula

Place, publisher, year, edition, pages
2017. Vol. 599, A110
National Category
Other Physics Topics Energy Engineering
Research subject
Energy Engineering; Applied Physics
Identifiers
URN: urn:nbn:se:ltu:diva-61736DOI: 10.1051/0004-6361/201629693ISI: 000395821900088Scopus ID: 2-s2.0-85015159073OAI: oai:DiVA.org:ltu-61736DiVA: diva2:1070234
Note

Validerad; 2017; Nivå 2; 2017-03-24 (andbra)

Available from: 2017-01-31 Created: 2017-01-31 Last updated: 2017-04-18Bibliographically approved

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