| DOI | Resolve DOI: https://doi.org/10.1093/mnras/staa1573 |
|---|
| Author | Search for: Kothes, R.1; Search for: Reich, W.; Search for: Safi-Harb, S.1; Search for: Guest, B.ORCID identifier: https://orcid.org/0000-0003-4078-0251; Search for: Reich, P.; Search for: Fürst, E. |
|---|
| Affiliation | - National Research Council of Canada. Herzberg Astronomy and Astrophysics
|
|---|
| Format | Text, Article |
|---|
| Subject | magnetic fields; polarization; ISM: individual objects: CTB 87; ISM: magnetic fields; ISM: supernova remnants |
|---|
| Abstract | We present radio continuum and linear polarization observations of the pulsar wind nebula (PWN) CTB 87 (G74.9+1.2) with the Effelsberg 100-m Radio Telescope between 4.75 and 32 GHz. An analysis of these new data including archived low-frequency observations at 1420 and 408 MHz from the Canadian Galactic Plane Survey shows that CTB 87 consists of two distinct emission components: a compact kidney-shaped component, 14 × 8.5 pc² (7.8 × 4.8 arcmin²) in size and a larger diffuse, spherical, and centrally peaked component of about 30 pc (17 arcmin) in diameter. The kidney-shaped component with a much steeper radio continuum spectrum is highly linearly polarized and likely represents a relic PWN. The diffuse component represents the undisturbed part of the PWN expanding inside a cavity or stellar wind bubble. The previously reported spectral break above 10 GHz is likely the result of missing large-scale emission and insufficient sensitivity of the high-frequency radio continuum observations. The simulation of the system’s evolution yields an age of about 18 000 yr as the result of a Type II supernova explosion with ejecta mass of about 12 M⊙ and explosion energy of about 7 × 10⁵⁰ erg. We also found evidence for a radio shell in our polarization data that represents the blast wave that entered the molecular cloud complex at a radius of about 13 pc. |
|---|
| Publication date | 2020-06-11 |
|---|
| Publisher | Oxford |
|---|
| In | |
|---|
| Language | English |
|---|
| Peer reviewed | Yes |
|---|
| Export citation | Export as RIS |
|---|
| Report a correction | Report a correction (opens in a new tab) |
|---|
| Record identifier | 7efb58a9-2045-4ce2-a88b-af85b96a557b |
|---|
| Record created | 2021-12-03 |
|---|
| Record modified | 2021-12-03 |
|---|
