USING MOLECULAR GAS PROPERTIES TO STUDY AGN Anne Klitsch DARK, - - PowerPoint PPT Presentation

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USING MOLECULAR GAS PROPERTIES TO STUDY AGN Anne Klitsch DARK, - - PowerPoint PPT Presentation

Aug 20, 2022 43 likes •294 views

USING MOLECULAR GAS PROPERTIES TO STUDY AGN Anne Klitsch DARK, Niels Bohr Institute, University of Copenhagen Cline Proux (ESO), Martin Zwaan (ESO), Ian Smail (CEA), Mark Swinbank (CEA), Rob Ivison (ESO) Marianne Vestergaard (DARK), Sandra

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USING MOLECULAR GAS PROPERTIES TO STUDY AGN

Anne Klitsch DARK, Niels Bohr Institute, University of Copenhagen

Céline Péroux (ESO), Martin Zwaan (ESO), Ian Smail (CEA), Mark Swinbank (CEA), Rob Ivison (ESO) Marianne Vestergaard (DARK), Sandra Raimundo (DARK)

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GAS FLOWS IN GALAXIES

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Gas Flows in Galaxies on Different Scales

1 – 1 p c . 1 – 1 k p c 1 – 1 k p c > 1 k p c

Strochi-Bergmann et al. 2019

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Gas Flows into and out of Galaxies

Tumlinson et al. 2018

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Absorption-selected systems

Our Tools and Aims

Use intervening absorbers to study gas flows on larger scales. Study the multiphase ISM and CGM

  • f the connected galaxies (neutral,

ionized and molecular gas) Find a connection with Nuclear activity? Understand the flow of baryons into and out of galaxies

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THE QUEST FOR ABSORBER HOST GALAXIES

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Difficult host galaxy identification

Until very recently: Only very few absorber host galaxies identified!

  • gas rich
  • not necessarily stellar mass rich
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SLIDE 8

Difficult host galaxy identification

Until very recently: Only very few absorber host galaxies identified! Integral field spectroscopy is a game changer

  • C. Péroux,AK+2019
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SLIDE 9

Difficult host galaxy identification

Until very recently: Only very few absorber host galaxies identified! Integral field spectroscopy is a game changer Molecular gas studies in progress

  • C. Péroux,AK+2019
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MOLECULAR GAS IN ABSORBER HOST GALAXIES

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Gas mass / stellar mass vs. redshift

adapted from Fynbo et al. (2018)

Molecular gas fraction is decreasing with decreasing redshift Absorption-selected galaxies follow the same trend as emission-selected galaxies

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SFR vs. molecular gas mass correlation

adapted from Kanekar et al. (2018)

12 molecular gas measurements for absorber host galaxies High molecular gas masses and low SFE? Most studies use Milky Way-type conversion factor and line ratios

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THE ALMACAL SURVEY

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ALMACAL

Unique (sub)mm archival survey carried out by utilizing ALMA calibrator

  • bservations.

Up until today > 800 quasar fields observed (> 2000h). Frequency setup depends on the science observations. Cross match with known absorbers to search for CO emission from connected galaxies.

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CO line detections from absorption-selected galaxies

Klitsch et al. (2019)

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Measuring molecular gas temperature and density

Carilli & Walter (2013)

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Molecular gas conditions in different galaxies

1 2 3 4 5 6 J 100 101 SJ/S(2

1)MW

Milky Way BzK M82 QSO SMG 1 2 3 4 5 6 100 101

Measuring the molecular gas temperature and density:

Carilli & Walter (2013)

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SLIDE 18

ISM conditions differ from Milky Way

1 2 3 4 5 6 J 100 101 SJ/S(2

1)MW

J0423B J0238A J0238A1 Milky Way BzK M82 QSO SMG 1 2 3 4 5 6 100 101

Measuring the molecular gas temperature and density:

Carilli & Walter (2013)

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SLIDE 19

ISM conditions differ from Milky Way

1 2 3 4 5 6 J 100 101 SJ/S(2

1)MW

J0423B J0238A J0238A1 Milky Way BzK M82 QSO SMG 1 2 3 4 5 6 100 101

CO SLEDs deviate from MW Galactic conversion factors not applicable? Galactic line ratios not applicable? High masses in the literature overestimated?

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Molecular gas masses overestimated?

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Interacting System

Ionized Gas Chen+2005

Galaxy A: active Galaxy A1: starburst + AGN environment

Molecular Gas

quasar or starburst like CO SLED

Neutral Gas

Extended high column density (log N(HI) = 21.7) HI structure

AK+19

Absorption selection → interacting/active systems?

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SUMMARY

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Summary

More evidence for groups associated to absorbers CO SLEDs of absorption selected galaxies suggest more excited ISM conditions → Absorption selection traces interacting/active systems? Harbour a large amount of gas that can fuel the AGN

RA (J2000) Dec (J2000) CO(2-1) CO(4-3) QSO J0238A CO(3-2) 10 kpc = 1.60"

AK+2018,2019

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Summary

More evidence for groups associated to absorbers CO SLEDs of absorption selected galaxies suggest more excited ISM conditions → Absorption selection traces interacting/active systems? Harbour a large amount of gas that can fuel the AGN

1 2 3 4 5 6 J 100 101 SJ/S(2

1)MW

J0423B J0238A J0238A1 Milky Way BzK M82 QSO SMG 1 2 3 4 5 6 100 101

Klitsch et al. (2019)

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SLIDE 25

Summary

More evidence for groups associated to absorbers CO SLEDs of absorption selected galaxies suggest more excited ISM conditions → Absorption selection traces interacting/active systems? Harbour a large amount of gas that can fuel the AGN

RA (J2000) Dec (J2000) CO(2-1) CO(4-3) QSO J0238A CO(3-2) 10 kpc = 1.60"

AK+2018,2019