「宇宙の間欠泉」から新たに出現した 双極高速ジェットから...
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![Page 1: 「宇宙の間欠泉」から新たに出現した 双極高速ジェットから …leo.lets.chukyo-u.ac.jp/rensei2019/slide/rensei2019_Imai.pdfAGARC, Kagoshima University FLASHING](https://reader033.vdocuments.mx/reader033/viewer/2022060916/60a95e3b5c895c5d4e4d8b51/html5/thumbnails/1.jpg)
「宇宙の間欠泉」から新たに出現した 双極高速ジェットからの同時噴出ガス塊今井 裕, 宇野友理, 前山大地, 山口諒祐, 甘田 渓, 濱江勇希(鹿児島大学),
Ross Burns(国立天文台), Gabor Orosz (タスマニア大学),
José Francisco Gómez (スペイン高等学術研究院),
Daniel Tafoya (オンサラ天文台), Lucero Uscanga(メキシコ自治大学)
2019年度連星系・変光星研究会
@中京大学 2019年11月30日
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NESS-NROComprehensive mapping of cold circumstellar envelopes in CO /13CO J=1→0 lines
Contours: JCMT 850 μm
30 000 AU @ 300pc
Amada, Imai et al. in prep.
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Water fountains Fast bipolar jets from dying stars traced by H2O masers
Image with ALMA+VLBA (Tafoya, Imai et al. in prep.)
CO J=2→1 (70 — 110 km/s) CO J=2→1 (-110 — -70 km/s) H2O masers (<90 km/s) 230 GHz dust continuum
Jet’s dynamical age: t~50 yearsPeriodic eruptions in 7 year cycle?Faster jet bullets with deceleration?
W43A
ALMA’s beam
500 AU @ 2.2 kpc
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FLASHING Finest Legacy Acquisitions of SiO- and H2O-maser
Ignitions by Nobeyama Generation
Using Nobeyama 45-m telescope + Perforated frequency separation filter plate
(Okada et al. 2020, PASJ) developed by HINOTORI (Hybrid Installation Project in Nobeyama, Triple-band Oriented)
Conducted as a Backup Program during 2018 December—2019 May (~260 hours)
Towards 17(+2) water fountains and candidates 3—14 observation sessions per source Velocity resolution: 0.42 km/s (H2O) and 0.22 km/s (SiO) Velocity coverage: 1258 km/s (H2O) Follow-up VLBI target-of-opportunity observations soon after new ignitions of highest velocity H2O maser components Will be registered in M2O (maser monitoring organization)
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Science goals of FLASHINGMonitoring 17 water fountains and candidates
Flux periodicity caused by stellar pulsation (1—5 years) Permanent death, evolving to a planetary nebula (~10 years) Recurrent outbursts caused by interactions in a binary system with a large eccentricity (>5 years) Line-of-sight velocity drifts caused by jet deceleration
Very long baseline time-domain radio astronomy
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Before ignitions of the highest velocity H2O maser components
Imai et al. (2020, PASJ VERA Special Issue)
Systemic velocity (~50 km/s)
IRAS 18286-0959
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New ignitions of the highest velocity H2O maser components
Imai et al. (2020, PASJ VERA Special Issue)
-160 -80 0 80 160 240LSR velocity [km/s]
Systemic velocity (~50 km/s)
IRAS 18286-0959
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New ignitions of the highest velocity H2O maser components
Imai et al. (2020, PASJ VERA Special Issue)
-160 -80 0 80 160 240LSR velocity [km/s]
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KaVA (KVN and VERA Combined Array)
target-of-opportunity follow-up
Epoch: 2019 March 4 for 6 hours
Participating telescopes: 4 VERA and 3 KVN antennas in LHCP
1Gbps recording —> Velocity coverage 1727 km/s 4096 channels —> Velocity resolution 0.42 km/s Synthesized beam: 2.1x1.4 mas, P.A.=-18 deg. 1-σ noise level: ~20 mJy/beam Maser spot identification: > 7-σ noise level
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Localization of the highest velocity H2O maser components
Imai et al. (2020, PASJ VERA Special Issue)
-150
-10
0
-50
0
50
1
00
150
200
2
50LS
R ve
locity
(km
s-1)
R.A. offset (mas)
Decl.
offse
t (ma
s)-2
00
-
100
0
1
00
200
0 -100
+1a
1b2b
2a3a
3b
4b
4a5a
5b
Mapped with KaVA (KVN and VERA Combined Array)
on 2019 March 6
Highest velocity jet before deceleration
Point symmetric pattern of maser distribution in a ~3.5 year spacing
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Decadal jet evolution
Imai et al. (2020, PASJ VERA Special Issue)
Clockwise precession and lobe expansion of the bipolar jet Dynamical age ~30 years New maser ignition after 2011
Short-lived (t<1 month) spots before 2011? Previous maser ignition before 2006?
Jet deceleration from 300 km/s to 110 km/s so as to mix with entrained material in ~3.5 years(?)
⇩
Velocity drift over ~10 km/s/yr!
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By-product of FLASHING Watching propagation of a shock wave?
S CrB SiO v=2 J=1→0 masers
(2018 December—2019 May
2 km/s100 days
Systemic velocity VLSR~-5 km/s (Famaey et al. 2005, A&Ap, 430, 165)
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By-product of FLASHING
0.15 km/s
Or watching mis-calculation of LSR velocity…… ?
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AcknowledgementsVery thanks to
Nobeyama Radio Observatory (Development Proposal 4171001) Mizusawa VLBI Observatory KVN/KASI AGARC, Kagoshima University FLASHING Team
KAKENHI grant-in-aid 16H02167 (P.I. Hiroshi Imai)
NAOJ Development Program P.I. Takeshi Manabe (FY2016, FY2017)