Interstellar Medium - LUTH - Observatoire de Paris

luth.obspm.fr

Interstellar Medium - LUTH - Observatoire de Paris

Interstellar Medium” team

Results and perspectives

Hervé Abgrall, Estelle Bayet (2006), Manuel Gonzalez, Jacques Le Bourlot

Franck Le Petit, Léandre Machin (2005-07), Evelyne Roueff

LUTH - Observatoire de Paris & Université Paris-Diderot

16 March 2009

Evaluation AERES - LUTH 1 / 27


Introduction

• Horsehead

Tools

Some Results

Projects

Interstellar Medium

Evaluation AERES - LUTH 2 / 27


Introduction

• Horsehead

Tools

Some Results

Projects

Interstellar Medium

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Introduction

• Horsehead

Tools

Some Results

Projects

Interstellar Medium

c○Spitzer - 8µm

Evaluation AERES - LUTH 4 / 27


Introduction

• Horsehead

Tools

Some Results

Projects

Interstellar Medium

c○JCMT - 850µm

Evaluation AERES - LUTH 5 / 27


Introduction

• Horsehead

Tools

Some Results

Projects

Interstellar Medium

c○ESO

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Introduction

Tools

• Models

• Observations

• Physics

Some Results

Projects

Models - PDR, Shocks, ...

Plane parallel, 1D, stationary

Chemistry, thermal balance, detailed balance

...and radiative transfer

Evaluation AERES - LUTH 7 / 27


Introduction

Tools

• Models

• Observations

• Physics

Some Results

Projects

Observations

• FUSE

• HST/STIS

• Spitzer

• CSO

• IRAM 30m

• IRAM PdB

• VLT

• Herschel

• ALMA

Evaluation AERES - LUTH 8 / 27


Introduction

Tools

• Models

• Observations

• Physics

Some Results

Projects

Atomic and Molecular Physics

• H2

◦ Structure (Rydberg

states)

◦ Formation on grains

◦ State specific dissociation

• Others

probabilities

◦ Chemical rates

◦ Isotopic fractionation

◦ Collisional excitation

c○IAS

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Introduction

Tools

Some Results

• Pequignot

• Transfer

• Deuteration

• H2

• H2 formation

• High z

Projects

D. Pequignot - PN

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Introduction

Tools

Some Results

• Pequignot

• Transfer

• Deuteration

• H2

• H2 formation

• High z

Projects

Radiative transfer - 1

Goicoechea & Le Bourlot (2007), Martin-Zaïdi et al. (2008)

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Introduction

Tools

Some Results

• Pequignot

• Transfer

• Deuteration

• H2

• H2 formation

• High z

Projects

Radiative transfer - 2

λ * u λ (erg cm −3 )

10 −10

10 −11

10 −12

10 −13

10 −14

10 3

ISRF computed with Meudon/IAS PDR+DUSTEM code

NGC7023 incident radiation

2.73 K Black Body

Field at A v = 0

10 4

PAH features

Evaluation AERES - LUTH 12 / 27

10 5

λ (Å)

10 6

Manuel Gonzalez thesis

Warm dust

10 7

CMB

10 8


Introduction

Tools

Some Results

• Pequignot

• Transfer

• Deuteration

• H2

• H2 formation

• High z

Projects

Deuterated molecules

• First detections of ND3,

ND2H, CH2D + , ...(?)

• Build chemical networks

• Used as diagnostic tool.

• Here:

ND2H, 110 − 101

in Barnard 1 cloud

(Roueff et al.)

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Introduction

Tools

Some Results

• Pequignot

• Transfer

• Deuteration

• H2

• H2 formation

• High z

Projects

Collisional excitation of ND2H

Machin & Roueff (2007)

(ND2H + He)

+ Grenoble (ND2H + H)

Evaluation AERES - LUTH 14 / 27


Introduction

Tools

Some Results

• Pequignot

• Transfer

• Deuteration

• H2

• H2 formation

• High z

Projects

Détection of 15 NH2D

NH2D (red ×1/50) vs. 15 NH2D (black)

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Introduction

Tools

Some Results

• Pequignot

• Transfer

• Deuteration

• H2

• H2 formation

• High z

Projects

H2 Spectrum - Theory vs. Lab.









Evaluation AERES - LUTH 16 / 27



Gabriel et al. (2009)


Introduction

Tools

Some Results

• Pequignot

• Transfer

• Deuteration

• H2

• H2 formation

• High z

Projects

H2 formation on grains

• “well known” from observations (?!)

Evaluation AERES - LUTH 17 / 27


Introduction

Tools

Some Results

• Pequignot

• Transfer

• Deuteration

• H2

• H2 formation

• High z

Projects

H2 formation on grains

• “well known” from observations (?!)

Evaluation AERES - LUTH 18 / 27


Introduction

Tools

Some Results

• Pequignot

• Transfer

• Deuteration

• H2

• H2 formation

• High z

Projects

H2 formation on grains

• “well known” from observations (?!)

Evaluation AERES - LUTH 19 / 27


Introduction

Tools

Some Results

• Pequignot

• Transfer

• Deuteration

• H2

• H2 formation

• High z

Projects

H2 formation on grains

• “well known” from observations (?!)

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Introduction

Tools

Some Results

• Pequignot

• Transfer

• Deuteration

• H2

• H2 formation

• High z

Projects

H2 formation - Problem I

• Evaporation is fast from hot grains.

Evaluation AERES - LUTH 21 / 27


Introduction

Tools

Some Results

• Pequignot

• Transfer

• Deuteration

• H2

• H2 formation

• High z

Projects

H2 formation - Problem II

• Grains are very small.

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Introduction

Tools

Some Results

• Pequignot

• Transfer

• Deuteration

• H2

• H2 formation

• High z

Projects

H2 formation - Statistical physics

• Collaboration with

O. Biham (Jerusalem)

• Use Master equation

for exact solution

• Validate

Moment equations

• Adapt to rate

formalism within

PDR code

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Introduction

Tools

Some Results

• Pequignot

• Transfer

• Deuteration

• H2

• H2 formation

• High z

Projects

H2 in DLAs (z = 2.4)

H2 up to J = 5, NI, Mg I, Mg II, SII, CI, CI ∗ , CII ∗ , etc...

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Introduction

Tools

Some Results

• Pequignot

• Transfer

• Deuteration

• H2

• H2 formation

• High z

Projects

H2 in DLAs (z = 2.4)

Low density, low radiation field, low grain/gaz ratio (∼ 10 −3 )

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Introduction

Tools

Some Results

Projects

• Strategy

• Collaborations

Strategy

• Keep working on 1D PDR Code

• Develop 2D code (ASTRONET Post-Doc)

• Open both codes via the web

• ALMA & Herschel

• Keep close interaction with physics

• Keep close interaction with observations

But possible only through “(Wo)Man Power”.

• Fall 2009: 3 post-docs positions

• Permanent position?

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Introduction

Tools

Some Results

Projects

• Strategy

• Collaborations

Contracts, Collaborations & Trivia (last 4 years only)

• Constant contractant with PCMI

• FP6 - “Molecular Universe”

• France - Israel specific collaboration

• ASTRONET: “Star Format”

• Herschel Key project (O2)

• Associated to numerous ANR propositions.

Collaborations in France and abroad

• LERMA, IAS, IAP, CESR, LAM, IRAM, ...

• Durham (GB), Köln (FRG), Madrid (S),

Los Angeles (Cal), Colombus (Ohi),

Jerusalem & Tel Aviv (I), Eindhoven (N)

• From ADS: 46 refereed papers (5 yrs)

• 3 PhD (C. Nehmé, L. Machin, M.

Gonzalez-Garcia)

Evaluation AERES - LUTH 27 / 27

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