Map of the 6.7 GHz class II methanol maser emission of the protoplanetary disk G23.01-0.41

• Published in: Astronomy reports 2011-05, Vol.55 (5), p.445-455
• Main Authors: Polushkin, S. V., Val’tts, I. E.
• Format: Article
• Language: English
• Subjects: Approximation; Astronomy; Disks; Flux; Line of sight; Masers; Methanol; Methyl alcohol; Observations and Techniques; Physics; Physics and Astronomy; Protoplanetary disks; Spots; Star & galaxy formation
• ISSN: 1063-7729; 1562-6881
• DOI: 10.1134/S1063772911040068

We present images of the star-forming regionG23.01–0.41 at 6.7GHz in the Class II methanol maser transition 5 1 –6 0 A + , produced from archival observations on the European VLBI Network. Our map of the source and its maser spots contains 24 maser components. The data for each spot—absolute coordinates, coordinates relative to the calibration feature, peak flux and flux integrated over the spot, size, position angle, velocity along the line of sight, and line full width at half-maximum—are collected in tabular form. The spatial region occupied by the maser spots is approximated by a 200×130 milliarcsec ellipse in position angle PA = −0.40°, centered on the absolute coordinates α 0 = 18 h 34 m 40.282 s , δ 0 = −09°00′38.27″ (J2000). If the source is a protoplanetary disk, then, for the distance estimate derived from trigonometric parallax, its diameter is 1800 AU, and the mass of the central protostar is 23.5 M ⊙ .