SDSS-V LVM: Collisionless Shocks in the Supernova Remnant RCW86
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2025
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| author | Sarbadhicary, Sumit K. Long, Knox S. Raymond, John C. Sankrit, Ravi Egorov, Oleg V. Roman-Lopes, Alexandre Blanc, Guillermo A. Gelfand, Joseph D. Badenes, Carles Drory, Niv Fernández-Trincado, José G. García, Pablo Johnston, Evelyn J. Jones, Amy M. Katkov, Ivan Yu. Kreckel, Kathryn Li, Jing Mejía-Narváez, Alfredo Méndez-Delgado, J. Eduardo Orozco-Duarte, Rogelio Sanchez, Sebastian Wong, Tony |
| author_facet | Sarbadhicary, Sumit K. Long, Knox S. Raymond, John C. Sankrit, Ravi Egorov, Oleg V. Roman-Lopes, Alexandre Blanc, Guillermo A. Gelfand, Joseph D. Badenes, Carles Drory, Niv Fernández-Trincado, José G. García, Pablo Johnston, Evelyn J. Jones, Amy M. Katkov, Ivan Yu. Kreckel, Kathryn Li, Jing Mejía-Narváez, Alfredo Méndez-Delgado, J. Eduardo Orozco-Duarte, Rogelio Sanchez, Sebastian Wong, Tony |
| contents | The supernova remnant (SNR) RCW86 is among the few SNRs with Balmer-emission lines containing broad and narrow spectral components that trace fast, non-radiative shocks in partially-ionized gas.\ These are invaluable laboratories for collisionless shock physics, especially for poorly-understood phenomena like electron-ion equilibration, and shock precursors. Here we present the first $\sim$0.3 pc spatial scale integral field unit (IFU) observations of the southwestern RCW86 shock, obtained as part of the Sloan Digital Sky Survey-V Local Volume Mapper (SDSS-V LVM). The forward shock, clearly visible as thin filaments in narrowband images, have broad H$α$ components, indicating shock velocities varying from 500--900 km/s in the south to 1000--1500 km/s in the north. The varying velocity widths and broad-to-narrow intensity ratios show that electrons and ions have lower equilibration ($T_e/T_p \rightarrow 0.1$) in faster ($>$800 km/s) shocks, in line with previous studies. The broad components are generally redshifted from the narrow components by $\lesssim$100 km/s, likely due to shock-obliquity or non-Maxwellian post-shock distributions. We observe high extinction-corrected Balmer-decrements of 3--5 in the narrow components, indicating that conversion of Ly$β$ photons to H$α$ is more efficient than Ly$γ$ to H$β$. Broad HeII$λ$4686 was marginally ($\gtrsim$2$σ$) detected in the southern shock, meaning the shock is impacting gas with high ($>$30--100\%) neutral fraction. We also find the first evidence of an intermediate H$α$ component in RCW86, with $Δ$V(FWHM) = 193--207 km/s, likely due to a neutral precursor. We also briefly discuss the southwestern radiative shock, and lay out the exciting future of studying astrophysical shocks with LVM. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_08257 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | SDSS-V LVM: Collisionless Shocks in the Supernova Remnant RCW86 Sarbadhicary, Sumit K. Long, Knox S. Raymond, John C. Sankrit, Ravi Egorov, Oleg V. Roman-Lopes, Alexandre Blanc, Guillermo A. Gelfand, Joseph D. Badenes, Carles Drory, Niv Fernández-Trincado, José G. García, Pablo Johnston, Evelyn J. Jones, Amy M. Katkov, Ivan Yu. Kreckel, Kathryn Li, Jing Mejía-Narváez, Alfredo Méndez-Delgado, J. Eduardo Orozco-Duarte, Rogelio Sanchez, Sebastian Wong, Tony High Energy Astrophysical Phenomena The supernova remnant (SNR) RCW86 is among the few SNRs with Balmer-emission lines containing broad and narrow spectral components that trace fast, non-radiative shocks in partially-ionized gas.\ These are invaluable laboratories for collisionless shock physics, especially for poorly-understood phenomena like electron-ion equilibration, and shock precursors. Here we present the first $\sim$0.3 pc spatial scale integral field unit (IFU) observations of the southwestern RCW86 shock, obtained as part of the Sloan Digital Sky Survey-V Local Volume Mapper (SDSS-V LVM). The forward shock, clearly visible as thin filaments in narrowband images, have broad H$α$ components, indicating shock velocities varying from 500--900 km/s in the south to 1000--1500 km/s in the north. The varying velocity widths and broad-to-narrow intensity ratios show that electrons and ions have lower equilibration ($T_e/T_p \rightarrow 0.1$) in faster ($>$800 km/s) shocks, in line with previous studies. The broad components are generally redshifted from the narrow components by $\lesssim$100 km/s, likely due to shock-obliquity or non-Maxwellian post-shock distributions. We observe high extinction-corrected Balmer-decrements of 3--5 in the narrow components, indicating that conversion of Ly$β$ photons to H$α$ is more efficient than Ly$γ$ to H$β$. Broad HeII$λ$4686 was marginally ($\gtrsim$2$σ$) detected in the southern shock, meaning the shock is impacting gas with high ($>$30--100\%) neutral fraction. We also find the first evidence of an intermediate H$α$ component in RCW86, with $Δ$V(FWHM) = 193--207 km/s, likely due to a neutral precursor. We also briefly discuss the southwestern radiative shock, and lay out the exciting future of studying astrophysical shocks with LVM. |
| title | SDSS-V LVM: Collisionless Shocks in the Supernova Remnant RCW86 |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2507.08257 |