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Article: Multiwavelength study of a new Galactic SNR G332.5-5.6
Title | Multiwavelength study of a new Galactic SNR G332.5-5.6 |
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Authors | |
Keywords | Surveys Radio continuum: general Supernova remnants |
Issue Date | 2007 |
Citation | Monthly Notices of the Royal Astronomical Society, 2007, v. 381, n. 1, p. 377-388 How to Cite? |
Abstract | We present compelling evidence for confirmation of a Galactic supernova remnant (SNR) candidate, G332.5-5.6, based initially on identification of new, filamentary, optical emission-line nebulosity seen in the arcsecond resolution images from the Anglo Australian Observatory (AAO)/United Kingdom Schmidt Telescope (UKST) Hα survey. The extant radio observations and X-ray data which we have independently re-reduced, together with new optical spectroscopy of the large-scale fragmented nebulosity, confirm the identification. Optical spectra, taken across five different, widely separated nebula regions of the remnant as seen in the Hα images, show average ratios of [N ii]/Hα = 2.42, [S ii]/Hα = 2.10 and [S ii] 6717/6731 = 1.23, as well as strong [O i] 6300, 6364 Å and [O ii] 3727 Å emission. These ratios are firmly 3within those typical of SNRs. Here, we also present the radio-continuum detection of the SNR at 20/13 cm from observations with the Australia Telescope Compact Array (ATCA). Radio emission is also seen at 4850 MHz, in the Parkes-MIT-NRAO (PMN) survey and at 843 MHz from the Sydney University Molonglo Sky Survey (SUMSS) survey. We estimate an angular diameter of ∼30 arcmin and obtain an average radio spectral index of α = -0.6 ± 0.1 which indicates the non-thermal nature of G332.5-5.6. Fresh analysis of existing ROSAT X-ray data in the vicinity also confirms the existence of the SNR. The distance to G332.5-5.6 has been independently estimated by Reynoso and Green as 3.4 kpc based on measurements of the H i λ21-cm line seen in absorption against the continuum emission. Our cruder estimates via assumptions on the height of the dust layer (3.1 kpc) and using the Σ-D relation (4 kpc) are in good agreement. © 2007 RAS. |
Persistent Identifier | http://hdl.handle.net/10722/208798 |
ISSN | 2023 Impact Factor: 4.7 2023 SCImago Journal Rankings: 1.621 |
ISI Accession Number ID |
DC Field | Value | Language |
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dc.contributor.author | Stupar, Milorad | - |
dc.contributor.author | Parker, Quentin A. | - |
dc.contributor.author | Filipovíc, Miroslav D. | - |
dc.contributor.author | Frew, David J. | - |
dc.contributor.author | Bojičić, Ivan S. | - |
dc.contributor.author | Aschenbach, Bernd R. | - |
dc.date.accessioned | 2015-03-23T02:01:44Z | - |
dc.date.available | 2015-03-23T02:01:44Z | - |
dc.date.issued | 2007 | - |
dc.identifier.citation | Monthly Notices of the Royal Astronomical Society, 2007, v. 381, n. 1, p. 377-388 | - |
dc.identifier.issn | 0035-8711 | - |
dc.identifier.uri | http://hdl.handle.net/10722/208798 | - |
dc.description.abstract | We present compelling evidence for confirmation of a Galactic supernova remnant (SNR) candidate, G332.5-5.6, based initially on identification of new, filamentary, optical emission-line nebulosity seen in the arcsecond resolution images from the Anglo Australian Observatory (AAO)/United Kingdom Schmidt Telescope (UKST) Hα survey. The extant radio observations and X-ray data which we have independently re-reduced, together with new optical spectroscopy of the large-scale fragmented nebulosity, confirm the identification. Optical spectra, taken across five different, widely separated nebula regions of the remnant as seen in the Hα images, show average ratios of [N ii]/Hα = 2.42, [S ii]/Hα = 2.10 and [S ii] 6717/6731 = 1.23, as well as strong [O i] 6300, 6364 Å and [O ii] 3727 Å emission. These ratios are firmly 3within those typical of SNRs. Here, we also present the radio-continuum detection of the SNR at 20/13 cm from observations with the Australia Telescope Compact Array (ATCA). Radio emission is also seen at 4850 MHz, in the Parkes-MIT-NRAO (PMN) survey and at 843 MHz from the Sydney University Molonglo Sky Survey (SUMSS) survey. We estimate an angular diameter of ∼30 arcmin and obtain an average radio spectral index of α = -0.6 ± 0.1 which indicates the non-thermal nature of G332.5-5.6. Fresh analysis of existing ROSAT X-ray data in the vicinity also confirms the existence of the SNR. The distance to G332.5-5.6 has been independently estimated by Reynoso and Green as 3.4 kpc based on measurements of the H i λ21-cm line seen in absorption against the continuum emission. Our cruder estimates via assumptions on the height of the dust layer (3.1 kpc) and using the Σ-D relation (4 kpc) are in good agreement. © 2007 RAS. | - |
dc.language | eng | - |
dc.relation.ispartof | Monthly Notices of the Royal Astronomical Society | - |
dc.subject | Surveys | - |
dc.subject | Radio continuum: general | - |
dc.subject | Supernova remnants | - |
dc.title | Multiwavelength study of a new Galactic SNR G332.5-5.6 | - |
dc.type | Article | - |
dc.description.nature | link_to_OA_fulltext | - |
dc.identifier.doi | 10.1111/j.1365-2966.2007.12296.x | - |
dc.identifier.scopus | eid_2-s2.0-35148887183 | - |
dc.identifier.volume | 381 | - |
dc.identifier.issue | 1 | - |
dc.identifier.spage | 377 | - |
dc.identifier.epage | 388 | - |
dc.identifier.eissn | 1365-2966 | - |
dc.identifier.isi | WOS:000249993900054 | - |
dc.identifier.issnl | 0035-8711 | - |