Catalog of spiral arm Tangents (Galactic Longitudes) in the Milky Way, and the Age Gradient based on various arm tangents

Abstract

An updated catalog of 205 observed tangents to the spiral arms (in Galactic longitudes) since 1980 is presented. This represents an addition of 80 arm tangents in 6 years (since 2016). Most arm tangents are observed at telescopes in the radio regime. In this study, the separation of each arm tracer from the dust lane is analyzed to obtain the relative speed away from the dust lane (an age gradient). Each arm tracer is observed to be separated from the dust lane, showing an age gradient of about 11.3 +/- 2 Myr/kpc across the spiral arm; this gives a relative speed away from the dust lane of about 87 +/- 10 km/s.

28 pages; 88 references; 11 tables; 4 figures

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Cited by in corpus (7)

• The Coherent Magnetic Field of the Milky Way
• The MPIfR-MeerKAT Galactic Plane survey I -- System setup and early results
• Kinematic structure of the Milky Way galaxy, near the spiral arm tangents
• The Galactic latitude dependency of Faraday complexity in the S-PASS/ATCA RM catalogue
• Superposing the Magnetic spiral structure of the Milky Way, on the stellar spiral arms -- Matching the unique galactic magnetic field reversal Zone with two galactic spiral arm Segments
• A new window into the sub-parsec scale magnetic field in the Milky Way? Unveiling small-scale magneto-ionic structures with Faraday complexity
• Cosmic Radioactivity and Galactic Chemical Evolution