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Dense Iron Ejecta and Core-Collapse Supernova Explosion in the Young Supernova Remnant G11.2-0.3

Moon, Dae-Sik and Koo, Bon-Chul and Lee, Ho-Gyu and Matthews, Keith and Lee, Jae-Joon and Pyo, Tae-Soo and Seok, Ji Yeon and Hayashi, Masahiko (2009) Dense Iron Ejecta and Core-Collapse Supernova Explosion in the Young Supernova Remnant G11.2-0.3. Astrophysical Journal Letters, 708 (1). L81-L85. ISSN 2041-8205.

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We present the results of near-infrared spectroscopic observations of dense (≳10^3 cm^(–3)) iron ejecta in the young core-collapse supernova remnant G11.2-0.3. Five ejecta knots projected to be close to its center show a large dispersion in their Doppler shifts: two knots in the east are blueshifted by more than 1000 km s^(-1), while three western knots have relatively small blueshifts of 20-60 km s^(-1). This velocity discrepancy may indicate that the western knots have been significantly decelerated or that there exists a systematic velocity difference among the knots. One ejecta filament in the northwestern boundary, on the other hand, is redshifted by ≳200 km s^(-1), while opposite filament in the southeastern boundary shows a negligible radial motion. Some of the knots and filaments have secondary velocity components, and one knot shows a bow shock-like feature in the velocity structure. The iron ejecta appear to be devoid of strong emission from other heavy elements, such as S, which may attest to the α-rich freezeout process in the explosive nucleosynthesis of the core-collapse supernova explosion close to its center. The prominent bipolar distribution of the Fe ejecta in the northwestern and southeastern direction, along with the elongation of the central pulsar wind nebula in the perpendicular direction, is consistent with the interpretation that the supernova exploded primarily along the northwestern and southeastern direction.

Item Type:Article
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URLURL TypeDescription
Moon, Dae-Sik0000-0003-4200-5064
Pyo, Tae-Soo0000-0002-3273-0804
Additional Information:© 2009. The American Astronomical Society. Received 2008 August 27; accepted 2009 August 13; published 2009 September 4. We thank Roger Chevalier,AdamBurrows,Ken’ichi Nomoto, Marten van Kerkwijk, Samar Safi-Harb, Chris Matzner, Andy Howell, and Alex Conley for helpful comments. D.-S.M. acknowledges the support by NSERC through Discovery program 327277 and B.-C.K. and D.-S.M acknowledge KOSEF through the Joint Research Project under the KOSEF-NSERC Cooperative Program F01-2007-000-10048-0.
Funding AgencyGrant Number
Natural Sciences and Engineering Research Council of Canada (NSERC)327277
Korea Science and Engineering FoundationF01-2007-000-10048-0
Korean Society for Atmospheric EnvironmentUNSPECIFIED
Subject Keywords:shock waves; supernova remnants; supernovae: general
Issue or Number:1
Record Number:CaltechAUTHORS:20091002-111858373
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Official Citation:Dense Iron Ejecta and Core-Collapse Supernova Explosion in the Young Supernova Remnant G11.2-0.3 Dae-Sik Moon, Bon-Chul Koo, Ho-Gyu Lee, Keith Matthews, Jae-Joon Lee, Tae-Soo Pyo, Ji Yeon Seok, and Masahiko Hayashi 2009 ApJ 703 L81-L85 doi: 10.1088/0004-637X/703/1/L81
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:16168
Deposited By: Ruth Sustaita
Deposited On:02 Oct 2009 23:29
Last Modified:19 Nov 2019 00:44

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