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| Main Authors: | , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2507.15834 |
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| _version_ | 1866916041811034112 |
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| author | Ogle, Patrick Petersen, Mark Rich, R. Michael Schaeffer, Tim McCallum, Lewis Noriega-Crespo, Alberto Sebastian, Biny Bjork, Carl Body, Steeve Chinnasamy, Sendhil Dreschsler, Marcel Kottary, Tarun Sainty, Yann Sparkman, Patrick Strottner, Xavier |
| author_facet | Ogle, Patrick Petersen, Mark Rich, R. Michael Schaeffer, Tim McCallum, Lewis Noriega-Crespo, Alberto Sebastian, Biny Bjork, Carl Body, Steeve Chinnasamy, Sendhil Dreschsler, Marcel Kottary, Tarun Sainty, Yann Sparkman, Patrick Strottner, Xavier |
| contents | We present new, deep narrowband imagery and discuss the nature of SDSO 1, the large [O III]-emitting nebula centered 1.5 degrees SE of M 31. We find strong evidence to support the hypothesis that SDSO 1 is unrelated to M 31 and is instead a faded, giant (D = 20 pc), ghost planetary nebula (GPN) expelled by the symbiotic WD binary star EG Andromedae. The associated 45-pc long turbulent tail, seen in projection in front of M 31, yields an estimated age of 400 kyr. The initial hypersonic velocity of 91 km/s drives a strong bow shock into the local interstellar medium and a reverse shock into the GPN. The SDSO 1 GPN has reached the terminal phase in its evolution where its outward expansion and forward motion have been decelerated greatly by ram pressure and the [O III] emission arises primarily from the reverse shock. We establish the shock-powered GPN phase as a new phase of planetary nebula (PN) evolution, and identify 24 candidate GPNe by their large size and shock-tail morphology. This includes several giant halos of younger PNe, possibly expelled by now degenerate binary companions. The interaction of an old, fast-moving GPN with the ISM generates shocks that remain visible long after the photoionized PN shell has faded below the limit of detectability. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_15834 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | SDSO1 is a Shocked Ghost Planetary Nebula in Front of M 31 Ogle, Patrick Petersen, Mark Rich, R. Michael Schaeffer, Tim McCallum, Lewis Noriega-Crespo, Alberto Sebastian, Biny Bjork, Carl Body, Steeve Chinnasamy, Sendhil Dreschsler, Marcel Kottary, Tarun Sainty, Yann Sparkman, Patrick Strottner, Xavier Astrophysics of Galaxies We present new, deep narrowband imagery and discuss the nature of SDSO 1, the large [O III]-emitting nebula centered 1.5 degrees SE of M 31. We find strong evidence to support the hypothesis that SDSO 1 is unrelated to M 31 and is instead a faded, giant (D = 20 pc), ghost planetary nebula (GPN) expelled by the symbiotic WD binary star EG Andromedae. The associated 45-pc long turbulent tail, seen in projection in front of M 31, yields an estimated age of 400 kyr. The initial hypersonic velocity of 91 km/s drives a strong bow shock into the local interstellar medium and a reverse shock into the GPN. The SDSO 1 GPN has reached the terminal phase in its evolution where its outward expansion and forward motion have been decelerated greatly by ram pressure and the [O III] emission arises primarily from the reverse shock. We establish the shock-powered GPN phase as a new phase of planetary nebula (PN) evolution, and identify 24 candidate GPNe by their large size and shock-tail morphology. This includes several giant halos of younger PNe, possibly expelled by now degenerate binary companions. The interaction of an old, fast-moving GPN with the ISM generates shocks that remain visible long after the photoionized PN shell has faded below the limit of detectability. |
| title | SDSO1 is a Shocked Ghost Planetary Nebula in Front of M 31 |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2507.15834 |