A high resolution HI study towards the supernova remnant Puppis A and its environments

REYNOSO ESTELA; CICHOWOLSKI SILVINA; WALSH ANDREW

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY

WILEY-BLACKWELL PUBLISHING, INC

Lugar: Londres; Año: 2017

0035-8711

We observed the supernova remnant (SNR) Puppis A in the 21 cm line with theAustralia Telescope Compact Array with the aim of determining the systemicvelocity and, hence, the corresponding kinematic distance. For the compact,background sources in the field, we obtain absorption spectra by applying twomethods: (a) subtracting profiles on- and off-source towards continuum emission,and (b) filtering short spacial frequencies in the Fourier plane to removelarge scale emission. One of the brightest features to the East of the shell ofPuppis A was found to be a background source, probably extragalactic. Removingthe contribution from this and the previously known unrelated sources, thesystemic velocity of Puppis A turns out to be limited between 8 and 12 km/s,which places this source at a distance of 1.3 +/- 0.3 kpc. From the combined images that include both single dish and interferometric data, we analyze the distribution of the interstellar hydrogen. We suggest that an ellipsoidal ring at v ~ +8 km/s could be the relic of a bubble blown by the progenitor of Puppis A, provided the distance is