RC Nearby mission

Virgo CO Survey of
Molecular Nuclei
Yoshiaki Sofue
Dept.Phys., Meisei Univ.
@ALMA WS Nearby Galaxies, NAOJ 2011 Feb. 10
GAMMA Project
with ALMA
Virgo Galaxy MAss MApping
ー銀河Dynamics空白地帯を埋めるー
技術、サイエンス
ALMA時代の銀河研究
１．日米欧：敵情を知れ。
２．ALMAは干渉計である。
(本質的にマッピングマシンである。）
3. NMAでの研究を基盤、正面突破
BIMA
(BERKELEY
CO
SONG
ILLINOIS MARYLAND ASSOCIATION
Survey of Nearby Galaxies)
OVRO
(Owens
/CARMA
Valley Radio Observatory )
IRAM
Plateau de Bure Interferometer
Nobeyama mm Array
NMA
Why Virgo?
Cepheid Distance 16 Mpc
CO rich Spirals
All-wave Atlases (Opt, Radio, HI, IR, FIR, X)
Visible from ALMA!
1. Nuclear Dynamics
&
Massive cores
NGC 3079 RAINBOW
RB+C+D
RB
NGC 3079
P-V Diagram: HI vs CO
HI (Irwin & Seaquist 91)
CO (NMA)
NGC 3079
CO PVD → RC → Mass Distribution
質量分布ー直接導出
>
>
Surf. Mass Density
• Massive Core
• Bulge
• Disk
• Dark Halo
Black hole connection
NGC 3079
2. “Single peak”
vs
“Twin peaks”
Nuclear ISM Physics
V
”Twin”
to
“Single”
“Single
peaks”
Molecular Nucleus
(Single Peaks） Rate
BIMA
5”
NMA-OV 4”
Virgo
3”
32% (14/44)
40% (8/20)
33% (5/15)
NMA Unifo1.5”
66% (4/6)
3. Uniform wt maps
in place for
RAINBOW
Ico=5660 K km/s-1
4. ISM Physics of
S-peaks
Single Peaks
Ico > 500 K km/s
N(H2) > 1023 H2 cm-2
超高密度分子コア
100
銀河系と比較
pc
High-Density Molecular Core in R~100 pc
(if conv.X=1x1020 H2/ K km-1)
Column Density
N(H2) > 1023 H2 cm-2
Gass Mass
M(H2) ~ Several108 Msun
Dynamical mass ~ 109 Msun
Schimidt Law
SFR∝Σ1.0(gas) (Schimidt law)
(Komugi et al. 2004)
X X
X X XN3079
[1] Bar accretion
“Twin peaks” + Ring
Temporary
[2] Feeding Nuclei
[3] Nucl. Mol. Core,
“Single Peak”
Stationary
SFR=Schmidt / Starburst
質量空白域 or DM cusp
Rc
銀河質量研究の空白領域 BH - Bulge
Log R
BH – Bulge – Disk
NGC 3079
BH formation in core/cusp
Rc
作業仮説
Flat RC
(Isothermal)
beyond BH.
MBH ～
0.9
MG
Log MBH～-1.8MB,disk
Log MBH
Log MBH ～ -1.8 MB,disk
MB,Bulge MB,disk
Kormendy 2000
１．野辺山、ＡＬＭＡ回転曲線
２．質量分布
３．銀河研究の空白地帯
４．対数回転曲線
NMA
Virgo
ALMA
Virgo
D = 16 Mpc D = 16Mpc
45m
Milky Way
D = 10kpc
Θ=1”
Θ=0.01”
Θ=15”
d=100 pc
d=1 pc
d=1 pc

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