Chandra衛星による新星残骸 GK PerのX線時間発展...
Transcript of Chandra衛星による新星残骸 GK PerのX線時間発展...
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Chandra衛星による新星残骸GK PerのX線時間発展の観測
武井 大(理研/SPring-8), Jeremy J. Drake (SAO),山口 弘悦 (NASA/GSFC), Patrick Slane (SAO),内山 泰伸 (立教大学), & 勝田 哲 (JAXA/ISAS)
(Takei et al. 2015, ApJ, 801, 92)
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Classical Novae
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Classical Novae
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超新星残骸 vs 新星残骸
GK PerseiCopyright: NASA/CXC/J. DePasquale
Cassiopeia ACopyright: NASA/CXC/SAO
http://chandra.harvard.edu/photo/2013/casa/casa.jpg
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超新星残骸 vs 新星残骸
大まかに言えばタイムスケールは質量と比例
Explosion EnergyEjecta MassEjecta Velocity
Free ExpansionAdiabaticCoolingDisappearance
102 years104 years105 years106 years
SNR NR
1046 erg10-4 M.103 km/s
1051 erg10 M.104 km/s
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GK Persei (Nova Persei 1901)
残骸の構造がX線で観測されている唯一の新星
2000年にChandraでX線残骸を観測(Balman 2005, ApJ)
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Chandra
X線で世界最高の空間分解能 (約0.5秒角)2013年(約14年ぶり)に2回目の観測を実施
http://smsc.cnes.fr/IcCOROT/Chandra.png
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Images (0.5-1.2 keV, 100 ksec)
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Images (0.5-1.2 keV, 100 ksec)
VTP
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Radial Profiles
中心付近はパイルアップ裾野は残骸成分が卓越
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Projection Profiles
最も明るい領域を比較14年間で2秒角ほど拡大
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Azimuthal Profiles
X線強度の位置依存性暗い所がより暗くなった
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X-ray Spectra
吸収+熱的プラズマ強度は60%~70%に低下
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Discussion
• Emission Measure: neniV ~ 1054 cm-3
• Spherical Emitting Volume: V ~ 1053 cm-3
• Shell Thickness: R/12 (= Compression Ratio of 4)
• Pre-Shock Number Density: n0 = ni/4 ~ 1 cm-3
• Swept-Up Mass: mHniV ~ 10-4 M.
• Sedov Solution:
• Total Explosion Energy: E ~ 1045 erg
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Discussion
• Expansion Rate in X-rays: 0.14 arcsec/year• Ejecta Velocity: vej ~ 300 km/s
• Plasma Temperature: kT ~ 0.2 keV• Cooling Coefficient: ~10-22 erg cm3 s-1
• Radiation Energy in 14 years: ER ~ 1039-1041 erg
• Radiative cooling is negligible
• Mean Flux Decline: 30-40%• The expansion into regions of much lower density
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http://www.riken.jp/en/pr/press/2015/20150317_1/
www.nasa.gov/mission_pages/chandra/mini-supernova-explosion-could-have-big-impact.html
http://chandra.harvard.edu/
http://www.alphagalileo.org/ViewItem.aspx?ItemId=150725&CultureCode=en http://www.alphagalileo.org/ViewItem.aspx?ItemId=150725&CultureCode=en
http://www.astroarts.co.jp/news/2015/03/17gk_persei/index-j.shtml
http://headlines.yahoo.co.jp/hl?a=20150312-00000027-rps-sctch