Study of a giant Large Magellanic Cloud Supernova Remnant, Veliki (J0450.4-7050)
Fuente:
arXiv
Salvato in:
| Autori principali: | , , , , , , , , , , , , , , |
|---|---|
| Natura: | Preprint |
| Pubblicazione: |
2025
|
| Soggetti: | |
| Accesso online: | |
| Tags: |
Aggiungi Tag
Nessun Tag, puoi essere il primo ad aggiungerne!!
|
| _version_ | 1866918062207270912 |
|---|---|
| author | Smeaton, Z. J. Filipović, M. D. Alsaberi, R. Z. E. Arbutina, B. Cotton, W. D. Crawford, E. J. Hopkins, A. M. Kothes, R. Leahy, D. Payne, J. L. Rajabpour, N. Sano, H. Sasaki, M. Urošević, D. van Loon, J. Th. |
| author_facet | Smeaton, Z. J. Filipović, M. D. Alsaberi, R. Z. E. Arbutina, B. Cotton, W. D. Crawford, E. J. Hopkins, A. M. Kothes, R. Leahy, D. Payne, J. L. Rajabpour, N. Sano, H. Sasaki, M. Urošević, D. van Loon, J. Th. |
| contents | We present a high-resolution radio-continuum view and a multi-frequency analysis of the Large Magellanic Cloud (LMC) Supernova Remnant (SNR) J0450.4-7050, which we give the nickname Veliki. These high-resolution observations reveal a larger extent than previously measured, making J0450.4-7050 one of the largest SNRs that we know of. Additionally, we observe a higher than expected radio surface brightness and an unusually flat spectral index ($α= -0.26 \pm 0.02$), with little spectral variation over the remnant. We observe a bright H$α$ shell indicating significant cooling over the remnant, but also an excess of [Oiii] on the eastern shock front. We investigate several theoretical scenarios to explain the emission and radio evolution of J0450.4-7050 in the context of the LMC environment, and determine that this is most likely an older, predominantly radiative, SNR with a higher shock compression ratio, which gives a flatter non-thermal spectrum, in combination with a thermal (bremsstrahlung) emission contribution. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_15067 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Study of a giant Large Magellanic Cloud Supernova Remnant, Veliki (J0450.4-7050) Smeaton, Z. J. Filipović, M. D. Alsaberi, R. Z. E. Arbutina, B. Cotton, W. D. Crawford, E. J. Hopkins, A. M. Kothes, R. Leahy, D. Payne, J. L. Rajabpour, N. Sano, H. Sasaki, M. Urošević, D. van Loon, J. Th. High Energy Astrophysical Phenomena We present a high-resolution radio-continuum view and a multi-frequency analysis of the Large Magellanic Cloud (LMC) Supernova Remnant (SNR) J0450.4-7050, which we give the nickname Veliki. These high-resolution observations reveal a larger extent than previously measured, making J0450.4-7050 one of the largest SNRs that we know of. Additionally, we observe a higher than expected radio surface brightness and an unusually flat spectral index ($α= -0.26 \pm 0.02$), with little spectral variation over the remnant. We observe a bright H$α$ shell indicating significant cooling over the remnant, but also an excess of [Oiii] on the eastern shock front. We investigate several theoretical scenarios to explain the emission and radio evolution of J0450.4-7050 in the context of the LMC environment, and determine that this is most likely an older, predominantly radiative, SNR with a higher shock compression ratio, which gives a flatter non-thermal spectrum, in combination with a thermal (bremsstrahlung) emission contribution. |
| title | Study of a giant Large Magellanic Cloud Supernova Remnant, Veliki (J0450.4-7050) |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2506.15067 |