Odin observations of ammonia in the Sgr A +50 km s-1 cloud and circumnuclear disk
Artikel i vetenskaplig tidskrift, 2017

Context. The Odin satellite is now into its sixteenth year of operation, much surpassing its design life of two years. One of the sources which Odin has observed in great detail is the Sgr A complex in the centre of the Milky Way. Aims. To study the presence of NH3 in the Galactic centre and spiral arms. Methods. Recently, Odin has made complementary observations of the 572 GHz NH3 line towards the Sgr A +50 km s-1 cloud and circumnuclear disk (CND). Results. Significant NH3 emission has been observed in both the +50 km s-1 cloud and the CND. Clear NH3 absorption has also been detected in many of the spiral arm features along the line of sight from the Sun to the core of our Galaxy. Conclusions. The very large velocity width (80 km s-1) of the NH3 emission associated with the shock region in the southwestern part of the CND may suggest a formation/desorption scenario similar to that of gas-phase H2O in shocks/outflows.

ISM: individual objects: Sgr A

ISM: clouds

Galaxy: center

ISM: molecules

Författare

Aa. Sandqvist

Stockholms observatorium

Åke Hjalmarson

Chalmers, Rymd- och geovetenskap, Radioastronomi och astrofysik

U. Frisk

Omnisys Instruments

S. Lundin

OHB AG Group

L. Nordh

Stockholms observatorium

Michael Olberg

Chalmers, Rymd- och geovetenskap, Onsala rymdobservatorium

G. Olofsson

Stockholms observatorium

Astronomy and Astrophysics

0004-6361 (ISSN) 1432-0746 (eISSN)

Vol. 599 A135

Ämneskategorier

Astronomi, astrofysik och kosmologi

DOI

10.1051/0004-6361/201629954

Mer information

Senast uppdaterat

2022-02-21