The East Asian Young Astronomers Meeting 20172017.11.15

Ionized Gas Outflows in Infrared-brightDOGs at 0 < z < 1
Dust-ObscuredGalaxies
Toba et al. 2017c, ApJ, in press. (arXiv:1710.02525)

Yoshiki TOBA (鳥羽 儀樹)(ASIAA)
Hyun-Jin Bae (AMC), Tohru Nagao (Ehime Univ.), Jong-Hak Woo (SNU),
Wei-Hao Wang (ASIAA), Alexander Wagner (Tsukuba Univ.),
Ai-Lei Sun (JHU), Yu-Yen Chang (ASIAA)

We discovered IR-bright DOGs with strong ionized gas outflowσκυλ狗hundgnijnaί

Dogs are obscured by blanket..

caneIntroduction

chó

What are Dust-Obscured Galaxies (DOGs)?

หมาdogcão
ा#"कchienакасоб2개犬We discovered IR-bright DOGs with strong ionized gas outflow

Introduction

Dust-Obscured Galaxies
i - [22] > 7.0 (AB mag)

IROpticalToba et al. 2015, PASJ, 67, 86• An optically faint but infrared(IR) bright objects.

~ ULIRGs, HyLIRGs

F(IR) > 1000 × F(optical)• Most DOGs are ultra-luminous infrared galaxies(ULIRGs: LIR ≥ 1012 Lsun)• Some DOGs are hyperluminous infrared galaxies(HyLIRGs: LIR ≥ 1013 Lsun)

3Toba & Nagao 2016, ApJ, 820, 46

We discovered IR-bright DOGs with strong ionized gas outflow

Introduction

The importance of IR-bright DOGs

• In the context of major merger scenario, particularly

IR-bright DOGs (FMIR > 1 mJy) may correspond to amaximum phase of AGN activity behind a large
amount of dust.

• Some IR-bright DOGs are expected to be a “blowout”
phase during the co-evolution.

Dey+094

We discovered IR-bright DOGs with strong ionized gas outflow

Introduction

The importance of IR-bright DOGs

• In the context of major merger scenario, particularly

IR-bright DOGs (FMIR > 1 mJy) may correspond to amaximum phase of AGN activity behind a large
amount of dust.

• Some IR-bright DOGs are expected to be a “blowout”
phase during the co-evolution.

DOGs

Dey+094

We discovered IR-bright DOGs with strong ionized gas outflowIntroduction

The importance of IR-bright DOGs

• In the context of major merger scenario, particularly

IR-brightDOGsDOGs(FMIR > are1 mJy)
maycorrespond toIR-brightkeypopulation
toamaximumphaseofAGN
activitybehindalarge
understanding the co-evolution.
amount of dust.

Some IR-bright DOGs are expected to be a “blowout”•They
are a good laboratory to investigate thephase during the co-evolution.

AGN feedback phenomenon.
DOGs

Dey+094

We discovered IR-bright DOGs with strong ionized gas outflow

Introduction

IR-bright DOGs survey with SDSS and WISE
SDSS spec

Toba & Nagao 2016, ApJ, 820, 46

WISE

SDSS-WISE object

SDSS

WISE

i - [22] >7

SDSS-WISE DOGs

67

5

We discovered IR-bright DOGs with strong ionized gas outflowIntroduction

IR-bright DOGs survey with SDSS and WISE
SDSS spec

Toba & Nagao 2016, ApJ, 820, 46

WISE

SDSS-WISE object

SDSSWISE

We focus on 32 IR-bright DOGs (0 < z < 1)with [OIII]λ5007 line
i - [22] >7

SDSS-WISE DOGs

675

We discovered IR-bright DOGs with strong ionized gas outflow

Introduction

Broad & blue-shifted [OIII]λ5007Å[OIII] λ5007Å

SDSS pipe line6

We discovered IR-bright DOGs with strong ionized gas outflow

Introduction

Some objects have broad and blueshifted [OIII]
blue-shiftedas[OIII]λ5007Å
lineBroadthat is &mis-identified
Lyα based on theSDSS pipeline[OIII] λ5007Å

SDSS pipe line

Purpose of this work

To investigate the properties of outflowing
gas based on a detailed spectral analysis

6

We discovered IR-bright DOGs with strong ionized gas outflow

ｼｬ~outflowing DOG!?

Data and Analysis
How do we evaluate a peculiar profile of [OIII] line?

7

We discovered IR-bright DOGs with strong ionized gas outflow Data and Analysis

Spectral analysis

collaborated withDr. Hyun-Jin Bae

8We discovered IR-bright DOGs with strong ionized gas outflow Data and Analysis

Spectral analysis

collaborated with
Dr. Hyun-Jin Bae

8We discovered IR-bright DOGs with strong ionized gas outflow Data and Analysis

Spectral analysis

collaborated with
Dr. Hyun-Jin Bae

8We discovered IR-bright DOGs with strong ionized gas outflow Data and Analysis

Spectral analysis

collaborated with
Dr. Hyun-Jin Bae

8We discovered IR-bright DOGs with strong ionized gas outflow Data and Analysis

Spectral analysis

9

We discovered IR-bright DOGs with strong ionized gas outflow Data and Analysis

Spectral analysis

9We discovered IR-bright DOGs with strong ionized gas outflow Data and Analysis

Spectral analysis

9

We discovered IR-bright DOGs with strong ionized gas outflow Data and Analysis

Spectral analysis
velocity offset
velocity dispersion

109

We discovered IR-bright DOGs with strong ionized gas outflow

Results and Discussions
Comparison of outflow strength between IR-bright
DOGs and Sy2s
What determines the outflow strength?
How about other lines such as [OII]λ3727?
11

IR-bright DOGs with strong ionized gas outflow

Results and Discussions

Velocity offset ー Velocity Dispersion diagram
IR-bright DOGs
SDSS Sy2s (Woo+16)12IR-bright DOGs with strong ionized gas outflow

Results and Discussions

Velocity offset ー Velocity Dispersion diagram
IR-bright DOGs
SDSS Sy2s (Woo+16)12IR-bright DOGs with strong ionized gas outflow

Results and Discussions

Velocity offset ー Velocity Dispersion diagram
IR-bright DOGs
SDSS Sy2s (Woo+16)~75% IR-bright DOGs have σ[OIII] > 300 km/s

12IR-bright DOGs with strong ionized gas outflow

Results and Discussions

Velocity offset ー Velocity Dispersion diagram
IR-bright DOGs
SDSS Sy2s (Woo+16)IR-bright DOGs show relatively strong outflows
compared to Sy2s12IR-bright DOGs with strong ionized gas outflow

Results and Discussions

LIR (AGN) vs. outflow strengthv[OIII] vs. LIR (AGN)
SDSS Sy2s (Woo et al. 2016)
IR-bright DOGs (This work)

σ[OIII] vs. LIR (AGN)
SDSS Sy2s (Woo et al. 2016)
IR-bright DOGs (This work)13

IR-bright DOGs with strong ionized gas outflow

Results and Discussions

LIR (AGN) vs. outflow strengthv[OIII] vs. LIR (AGN)
SDSS Sy2s (Woo et al. 2016)
IR-bright DOGs (This work)

σ[OIII] vs. LIR (AGN)
SDSS Sy2s (Woo et al. 2016)
IR-bright DOGs (This work)

LIR (AGN) correlates with V[OIII] and σ[OIII]

13

IR-bright DOGs with strong ionized gas outflow

Results and Discussions

DOGs
LIR (AGN) vs. outflowIR-brightstrength
SDSS Sy2s (Woo+16)v[OIII] vs. LIR (AGN)
SDSS Sy2s (Woo et al. 2016)
IR-bright DOGs (This work)

σ[OIII] vs. LIR (AGN)
SDSS Sy2s (Woo et al. 2016)
IR-bright DOGs (This work)

LIR (AGN) correlates with V[OIII] and σ[OIII]

The systematic offset on the VVD is due to the differencein LIR(AGN)13

IR-bright DOGs with strong ionized gas outflow

Results and Discussions

VVD diagram for other lines[OIII][OII][NeIII]

14

IR-bright DOGs with strong ionized gas outflow

Results and Discussions

VVD diagram for other lines[OIII][OII][NeIII]The highly ionized gas
tends to show stronger outflows

14IR-bright DOGs with strong ionized gas outflow

Summary

Summary
We investigated ionized gas properties of 32 IR-bright
DOGs selected with SDSS and WISE

24/32 (75%) IR-bright DOGs have astrong [OIII] outﬂow
IR-bright DOGs show relatively strong
outﬂows compared to Sy2s due to thediﬀerence in LIR(AGN)
The highly ionized gas tends to showstronger outﬂows15

I ♥ DOGs

16