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Article: Physical conditions in circumstellar gas surrounding SN 1987A 12 years after outburst

TitlePhysical conditions in circumstellar gas surrounding SN 1987A 12 years after outburst
Authors
KeywordsCircumstellar Matter
Supernova Remnants
Supernovae: Individual (Sn 1987A)
Issue Date2000
PublisherInstitute of Physics Publishing Ltd. The Journal's web site is located at http://iopscience.iop.org/2041-8205
Citation
Astrophysical Journal Letters, 2000, v. 545 n. 1 PART 1, p. 390-398 How to Cite?
AbstractTwo-dimensional spectra of SN 1987A were obtained on 1998 November 14-15 (4282 days after outburst) with the Space Telescope Imaging Spectrograph (STIS) on board the Hubble Space Telescope (HST). The slit sampled portions of the inner circumstellar ring at the east and west ansae as well as small sections of both the northern and southern outer rings. The temperature and density at these locations are estimated by nebular analysis of [N II], [O III], and [S II] emission-line ratios, and with time-dependent photoionization/recombination models. The results from these two methods are mutually consistent. The electron density in the inner ring is ∼4000 cm -3 for S II, with progressively lower densities for N II and O III. The electron temperatures determined from [N II] and [O III] line ratios are ∼11,000 and ∼22,000 K, respectively. These results are consistent with evolutionary trends in the circumstellar gas from similar measurements at earlier epochs. We find that emission lines from the outer rings come from gas of lower density (n e ≲ 2000 cm -3) than that which emits the same line in the inner ring. The N/O ratio appears to be the same in all three rings. Our results also suggest that the CNO abundances in the northern outer ring are the same as in the inner ring, contrary to earlier results. Physical conditions in the southern outer ring are less certain because of poorer signal-to-noise data. The STIS spectra also reveal a weak Hα emission redshifted by ∼100 km s -1 at P.A. 103° that coincides with the recently discovered new regions that are brightening. This indicates that the shock interaction in the southeast section of the inner ring commenced over a year before it became apparent in HST images.
Persistent Identifierhttp://hdl.handle.net/10722/174801
ISSN
2015 Impact Factor: 5.487
2015 SCImago Journal Rankings: 3.369
References

 

DC FieldValueLanguage
dc.contributor.authorMaran, SPen_US
dc.contributor.authorSonneborn, Gen_US
dc.contributor.authorPun, CSJen_US
dc.contributor.authorLundqvist, Pen_US
dc.contributor.authorIping, RCen_US
dc.contributor.authorGull, TRen_US
dc.date.accessioned2012-11-26T08:47:32Z-
dc.date.available2012-11-26T08:47:32Z-
dc.date.issued2000en_US
dc.identifier.citationAstrophysical Journal Letters, 2000, v. 545 n. 1 PART 1, p. 390-398en_US
dc.identifier.issn2041-8205en_US
dc.identifier.urihttp://hdl.handle.net/10722/174801-
dc.description.abstractTwo-dimensional spectra of SN 1987A were obtained on 1998 November 14-15 (4282 days after outburst) with the Space Telescope Imaging Spectrograph (STIS) on board the Hubble Space Telescope (HST). The slit sampled portions of the inner circumstellar ring at the east and west ansae as well as small sections of both the northern and southern outer rings. The temperature and density at these locations are estimated by nebular analysis of [N II], [O III], and [S II] emission-line ratios, and with time-dependent photoionization/recombination models. The results from these two methods are mutually consistent. The electron density in the inner ring is ∼4000 cm -3 for S II, with progressively lower densities for N II and O III. The electron temperatures determined from [N II] and [O III] line ratios are ∼11,000 and ∼22,000 K, respectively. These results are consistent with evolutionary trends in the circumstellar gas from similar measurements at earlier epochs. We find that emission lines from the outer rings come from gas of lower density (n e ≲ 2000 cm -3) than that which emits the same line in the inner ring. The N/O ratio appears to be the same in all three rings. Our results also suggest that the CNO abundances in the northern outer ring are the same as in the inner ring, contrary to earlier results. Physical conditions in the southern outer ring are less certain because of poorer signal-to-noise data. The STIS spectra also reveal a weak Hα emission redshifted by ∼100 km s -1 at P.A. 103° that coincides with the recently discovered new regions that are brightening. This indicates that the shock interaction in the southeast section of the inner ring commenced over a year before it became apparent in HST images.en_US
dc.languageengen_US
dc.publisherInstitute of Physics Publishing Ltd. The Journal's web site is located at http://iopscience.iop.org/2041-8205en_US
dc.relation.ispartofAstrophysical Journal Lettersen_US
dc.subjectCircumstellar Matteren_US
dc.subjectSupernova Remnantsen_US
dc.subjectSupernovae: Individual (Sn 1987A)en_US
dc.titlePhysical conditions in circumstellar gas surrounding SN 1987A 12 years after outbursten_US
dc.typeArticleen_US
dc.identifier.emailPun, CSJ: jcspun@hkucc.hku.hken_US
dc.identifier.authorityPun, CSJ=rp00772en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.scopuseid_2-s2.0-0034634985en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0034634985&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume545en_US
dc.identifier.issue1 PART 1en_US
dc.identifier.spage390en_US
dc.identifier.epage398en_US
dc.publisher.placeUnited Kingdomen_US
dc.identifier.scopusauthoridMaran, SP=7003703651en_US
dc.identifier.scopusauthoridSonneborn, G=7006137500en_US
dc.identifier.scopusauthoridPun, CSJ=7003931846en_US
dc.identifier.scopusauthoridLundqvist, P=7004499555en_US
dc.identifier.scopusauthoridIping, RC=24492119800en_US
dc.identifier.scopusauthoridGull, TR=7007163365en_US

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