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Sökning: WFRF:(Chevalier Roger A.) > MAPPING HIGH-VELOCI...

LIBRIS Formathandbok  (Information om MARC21)
FältnamnIndikatorerMetadata
00003363naa a2200493 4500
001oai:DiVA.org:su-115986
003SwePub
008150408s2015 | |||||||||||000 ||eng|
024a https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-1159862 URI
024a https://doi.org/10.1088/2041-8205/801/1/L162 DOI
040 a (SwePub)su
041 a engb eng
042 9 SwePub
072 7a ref2 swepub-contenttype
072 7a art2 swepub-publicationtype
100a France, Kevin4 aut
2451 0a MAPPING HIGH-VELOCITY H alpha AND Ly alpha EMISSION FROM SUPERNOVA 1987A
264 1c 2015
338 a print2 rdacarrier
500 a AuthorCount:15;
520 a We present new Hubble Space Telescope images of high-velocity H alpha and Ly alpha emission in the outer debris of SN 1987 A. The Ha images are dominated by emission from hydrogen atoms crossing the reverse shock (RS). For the first time we observe emission from the RS surface well above and below the equatorial. ring (ER), suggesting a bipolar or conical structure perpendicular to the ring plane. Using the H alpha imaging, we measure the mass flux of hydrogen atoms crossing the RS front, in the velocity intervals (-7500 < V-obs < -2800 km s(-1)) and (1000 < V-obs < 7500 km s(-1)), (M)(H) over dot = 1.2 x 10(-3) M-circle dot yr(-1). We also present the first Ly alpha imaging of the whole remnant and new Chandra X-ray observations. Comparing the spatial distribution of the Ly alpha and X-ray emission, we observe that the majority of the high-velocity Ly alpha emission originates interior to the ER. The observed Ly alpha/H alpha photon ratio, < R(L alpha/H alpha)> approximate to 17, is significantly higher than the theoretically predicted ratio of approximate to 5 for neutral atoms crossing the RS front. We attribute this excess to Ly alpha emission produced by X-ray heating of the outer debris. The spatial orientation of the Ly alpha and X-ray emission suggests that X-ray heating of the outer debris is the dominant Ly alpha production mechanism in SN 1987 A at this phase in its evolution.
650 7a NATURVETENSKAPx Fysikx Astronomi, astrofysik och kosmologi0 (SwePub)103052 hsv//swe
650 7a NATURAL SCIENCESx Physical Sciencesx Astronomy, Astrophysics and Cosmology0 (SwePub)103052 hsv//eng
653 a circumstellar matter
653 a shock waves
653 a supernovae: individual (SN 1987A)
700a McCray, Richard4 aut
700a Fransson, Claesu Stockholms universitet,Institutionen för astronomi4 aut0 (Swepub:su)frans
700a Larsson, Josefin4 aut
700a Frank, Kari A.4 aut
700a Burrows, David N.4 aut
700a Challis, Peter4 aut
700a Kirshner, Robert P.4 aut
700a Chevalier, Roger A.4 aut
700a Garnavich, Peter4 aut
700a Heng, Kevin4 aut
700a Lawrence, Stephen S.4 aut
700a Lundqvist, Peteru Stockholms universitet,Institutionen för astronomi4 aut0 (Swepub:su)lundq
700a Smith, Nathan4 aut
700a Sonneborn, George4 aut
710a Stockholms universitetb Institutionen för astronomi4 org
773t Astrophysical Journal Lettersg 801:1q 801:1x 2041-8205x 2041-8213
8564 8u https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-115986
8564 8u https://doi.org/10.1088/2041-8205/801/1/L16

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