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How to maintain the star formation of the Milky Way Galaxy? On the - - PowerPoint PPT Presentation

Feb 06, 2024 41 likes •644 views

How to maintain the star formation of the Milky Way Galaxy? On the value of single dish full-sky surveys Jrgen Kerp 1 , Benjamin Winkel 2 , Peter Kalberla 1 and the EBHIS team 1 Argelander-Institut fr Astronomie, Universitt Bonn 2

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„How to maintain the star formation of the Milky Way Galaxy?“ On the value of single dish full-sky surveys

Jürgen Kerp1, Benjamin Winkel2, Peter Kalberla1 and the EBHIS team

1Argelander-Institut für Astronomie, Universität Bonn 2Max-Planck-Institut für Radioastronomie

jkerp@uni-bonn.de 1

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HI 21-cm line data

jkerp@uni-bonn.de 2

Adopted Wikipedia

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HI 21-cm line data

Peak → lower limit to gas temperature FWHM → upper limit to gas temperature

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Square Kilometer Array (SKA)

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Wikipedia

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Single dish to radio interferometer

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Single dish to radio interferometer

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Single dish to radio interferometer

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HVC 125+41-207: radio interferometer

jkerp@uni-bonn.de Braun & Burton 2000, A&A 354, 853 8

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HVC 125+41-207: Effelsberg dish

VII-9 jkerp@uni-bonn.de Brüns, Kerp & Pagels 2001, A&A 370, L26

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Radio interferometer are sensitive to small scale structure Single dish telescopes are sensitive to structures on scales of the

  • bserved area of interest

jkerp@uni-bonn.de VII- 10

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Radio interferometer are sensitive to small scale structure Single dish telescopes are sensitive to structures on scales of the

  • bserved area of interest

Single dish full-sky surveys can disclose structures across hundreds of square degrees

jkerp@uni-bonn.de VII- 11

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Stray-radiation

12 Winkel et al. (2016), A&A 585, 41

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Effelsberg-Bonn HI Survey (EBHIS)

jkerp@uni-bonn.de 13

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Effelsberg-Bonn HI Survey (EBHIS)

  • Effelsberg 100-m key-science project
  • started in August 2008
  • first coverage finished spring 2013
  • angular resolution: 10.8’
  • velocity resolution: 1.4 km/s
  • sensitivity: ~90 mK
  • maximum redshift: 0.07
  • data are public (CDS)
  • Motivated FPGA spectrometer technology!

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Effelsberg-Bonn HI Survey (EBHIS)

  • 10 TByte of raw data
  • Software written from scratch
  • Many new methods/algorithms developed

–RFI mitigation (Flöer+ 2009) –Stray-radiation removal (Kalberla; see Winkel+ 2016a) –Flux calibration/Bandpass removal

(Winkel & Kerp 2007; Winkel+ 2010, 2012a, 2016a)

–Source finding/parametrization

(Flöer & Winkel 2012; Flöer+ 1014)

–Data gridding (Winkel+ 2016b) –Basket-weaving (Winkel+ 2012b)

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EBHIS first data release after two years

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HI4PI: Effelsberg & Parkes Milky Way Surveys

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HI4PI collaboration: 2016 A&A 594, A116

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HI4PI still a top 10 paper of Astronomy & Astrophysics after a year

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20 Kerp+ 2011 Winkel+ 2016 jkerp@uni-bonn.de

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21 Kerp+ 2011 Winkel+ 2016 jkerp@uni-bonn.de

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22 Kerp+ 2011 Winkel+ 2016 jkerp@uni-bonn.de

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Green Bank Telescope: M31 HVCs

jkerp@uni-bonn.de 23 Thilker, Braun & Westmeier 2005, ASP 331, 113

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EBHIS: M31 HVCs

jkerp@uni-bonn.de 24 Kerp et al.. 2016, A&A 589, 120

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EBHIS: M31 HVCs

jkerp@uni-bonn.de 25 Kerp et al.. 2016, A&A 589, 120

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„How to maintain the star formation of the Milky Way Galaxy?“

jkerp@uni-bonn.de 26

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Persistent fueling: no evidence for major mergers

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Halo and disk-halo interface

jkerp@uni-bonn.de 28 Marasco, Marinacci & Fraternali 2013, MNRAS 443, 1634

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Magnani & Smith 2010, ApJ 722, 1685

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Magnani & Smith 2010, ApJ 722, 1685

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In 2010 about 11 molecular IVCs were known

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Dust to HI gas

atomic molecular molecular atomic

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  • T. Röhser 2016 Ph. D., U. Bonn
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Finding molecular IVCs: Gaussian decomposition

jkerp@uni-bonn.de 34 Kalberla & Haud 2015, A&A 578, A78

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IVC 86+38

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  • T. Röhser 2016 Ph. D., U. Bonn
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North

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Röhser et al. 2016, A&A 596, 94

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North

HI 21-cm line data

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Röhser et al. 2016, A&A 596, 94

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South

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Röhser et al. 2016, A&A 596, 94

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South

artefact MS

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Röhser et al. 2016, A&A 596, 94

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North-south asymmetry

Total numbers of FIR excess IVCs ~ 1000!!!!

694 MIVCs towards the northern sky 389 toward the southern sky

Large clouds (> 35 arcmin)

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Röhser et al. (2016), A&A 596, 94

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North-south asymmetry

Total numbers of FIR excess IVCs

694 MIVCs towards the northern sky 389 toward the southern sky

Large clouds (> 35 arcmin)

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Röhser et al. (2016), A&A 596, 94

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North-south asymmetry

Total numbers of FIR excess IVCs

694 MIVCs towards the northern sky 389 toward the southern sky

Large clouds (> 35 arcmin)

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Röhser et al. (2016), A&A 596, 94

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MIVCs: tiny extent and mass, but many

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Röhser et al. (2016), A&A 596, 94

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MIVCs: tiny extent and mass, but many

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Too faint and too tiny to detect them beyond

the Magellanic Cloud System

Röhser et al. (2016), A&A 596, 94

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MIVCs: tiny extent and mass, but many

jkerp@uni-bonn.de 47

Total local mass of IVCs 3.1 106 Msun Up to 0.5 Msuna-1

Only 10% of the Milky Way halo is probed

Röhser et al. (2016), A&A 596, 94

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What next?

jkerp@uni-bonn.de 48

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EBHIS: confirmed galaxy detections

jkerp@uni-bonn.de 49 Flöer 2015, PhD thesis Bonn University

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EBHIS: Zone of avoidence

jkerp@uni-bonn.de 50 Schöder, Flöer, Winkel in prep.

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EBHIS: radio continuum full sky map

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Winkel et al., in prep.

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Foregrounds

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Polarization and Faraday rotation

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NHI map Planck polarization fraction

Bachelor these A. Manthei 2017

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Polarization and Faraday rotation

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NHI map Planck Faraday rotation

Bachelor these A. Manthei 2017

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Polarization and Faraday rotation

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Dust temperature (Planck) Faraday rotation

Bachelor these A. Manthei 2017

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Cosmic infrared background (CIB)

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  • D. Lenz, 2016 Ph. D., U. Bonn
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Cosmic infrared background (CIB)

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  • D. Lenz, 2016 Ph. D., U. Bonn
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eRosita (2019): X-ray full-sky survey

jkerp@uni-bonn.de 58 MPE

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HI 21-cm column density 0.25 keV ROSAT

Dark Gas: correlation with X-rays

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  • J. Kerp „X-ray astroomy“ 2003
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Thank you

jkerp@uni-bonn.de 60

Poster of Charitarth Vyas on gas accretion