effelsberg-bonn hi survey (ebhis)
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Effelsberg-Bonn HI Survey (EBHIS)
Jürgen Kerp1,Benjamin Winkel2, Nadya Ben Bekhti1, Shahram Faridani1, Lars Flöer1, Peter
Kalberla1, Daniel Lenz1,Tobias Röhser1
1Argelander-Institut für Astronomie 2Max-Planck-Institut für Radioastronomie
jkerp@astro.uni-bonn.de
To make an all-sky survey of Galactic 21-To make an all-sky survey of Galactic 21-cm emission with a 100m-class telescope cm emission with a 100m-class telescope has been a dream for many decades, now has been a dream for many decades, now the dream is finally coming true.the dream is finally coming true.
jkerp@astro.uni-bonn.de
anonymous referee
• 7-beam receiver system
• On-the fly observing mode
• Fully sampled sky coverage above Dec = -5⁰
• EBHIS observations started in August 2008
• First full sky coverage finished in April 2013!
jkerp@astro.uni-bonn.de
EBHIS concept• Galactic and extragalactic HI survey in
parallel: • 21.400 square degrees • 100 MHz bandwidth z ≤ 0.07 (270 Mpc)• 14 spectrometer with 16384 spectral channels each• High angular resolution → fully sampled grid 1/44 LAB• Complementary to the Parkes multi-feed survey projects
(HIPASS,GASS)
jkerp@astro.uni-bonn.de
EBHIS concept
HVC 289+33+251
Brüns & Westmeier 2004, A&A 426, L9
Beam filling is different !
LAB
100-m
EBHIS concept
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jkerp@astro.uni-bonn.deImage: B. Winkel
EBHIS: extragalactic science prospects
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EBHIS “The HI Nearby Galaxy Survey”
jkerp@astro.uni-bonn.de
Walter et al. 2008, AJ 136, 2563
EBHIS: THINGS ensemble
jkerp@astro.uni-bonn.deKerp et al. 2013, in prep.
EBHIS: THINGS ensemble
jkerp@astro.uni-bonn.deKerp et al. 2013, in prep.
EBHIS: THINGS ensemble
jkerp@astro.uni-bonn.deKerp et al. 2013, in prep.
EBHIS vs. THINGS: flux comparison I
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THINGS: NGC 3031 (M81)
jkerp@astro.uni-bonn.de
Walter et al. 2008, AJ 136, 2563
ETHINGS: NGC 3031 (M81)
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Kerp et al. 2013, in prep.
ON-OFF
ETHINGS: NGC 3031 (M81)
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Background: EBHIS Inset: THINGS
ETHINGS: NGC 3031 (M81)
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Background: EBHIS Inset: THINGS
Poster: Shahram Faridani
EBHIS vs. HyperLeda: flux comparison II
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EBHIS: Milky Way science prospects
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The northern polar cap (LAB)
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b=30⁰
l=270⁰l=90⁰
The northern polar cap (EBHIS)
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b=30⁰
l=270⁰l=90⁰
The northern polar cap (EBHIS)
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IVC135+53
Draco
IVC 88+56
IVC Spur & Arc
The northern polar cap (EBHIS)
jkerp@astro.uni-bonn.de
IVC135+53
Draco
IVC 88+56
IVC Spur & Arch
EBHIS-Planck correlation
jkerp@astro.uni-bonn.de24
EBHIS-Planck correlation (H2 formation)
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Ph. D. Tobias Röhser
25
EBHIS-Planck correlation (H2 formation)
jkerp@astro.uni-bonn.de
Ph. D. Tobias Röhser
26
EBHIS-Planck correlation (H2 formation)
jkerp@astro.uni-bonn.de
Ph. D. Tobias Röhser
27
Poster: Tobias Röhser
The northern polar cap (EBHIS)
jkerp@astro.uni-bonn.de
IVC135+53
Draco
IVC 88+56
IVC 88+56
IVC 135+53 (velocity bridge)
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Lenz et al., in prep.
IVC 135+53 (HVC deceleration)
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Lenz et al., in prep.
IVC 135+53 (dust-to-gas ratio)
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-0.43±0.12 dex (Feige 48) Hernandez et al. 2013, submitted
Lenz et al., in prep.
IVC 135+53 (EBHIS-Planck → H2 map)
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Lenz et al., in prep.
Lenz et al., in prep.
IVC 135+53 (EBHIS-Planck → H2 map)
jkerp@astro.uni-bonn.de
Lenz et al., in prep.
H2 rain? (HVC triggered IVC H2 formation?) 1. Towards the northern polar cap we observe about 1∙106 Msun @ 500
pc altitude
2. Say 10% of the mass H2
3. Northern polar cap 1sr
4. Yielding 1∙106 MSun of H2 full sky
5. Free fall time t ~ 106
1 Msun/year (low metallicity)
Extent 5 pc distance about 500 pc
→ 35’ @ 500 pc
→ 21” @ 50 kpc (LMC/SMC)
→ 0.3” @ 3.5 Mpc (Ursa Major)
“Dark Gas” Wolfire, Hollenbach & McKee 2010, ApJ 716, 1191jkerp@astro.uni-bonn.de
EBHIS products
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Ph. D. Lars Flöer
The future: second coverage > 30⁰
jkerp@astro.uni-bonn.de Image: B. Winkel
Thank you!
KE757/7-1 to 7-3
jkerp@astro.uni-bonn.de
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