a survey for dla galaxies with integral field spectroscopy
DESCRIPTION
A survey for DLA galaxies with integral field spectroscopy. Lise Christensen ( Ph.D. student, AIP, Postdam) Collaborators: Sebastian Sanchez, Knud Jahnke, Lutz Wisotski, Martin Roth. The survey. Purpose What types of galaxies host DLAs? - PowerPoint PPT PresentationTRANSCRIPT
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A survey for DLA galaxieswith integral field spectroscopy
Lise Christensen ( Ph.D. student, AIP, Postdam)Collaborators: Sebastian Sanchez, Knud Jahnke,
Lutz Wisotski, Martin Roth
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The survey
PurposeWhat types of galaxies host DLAs?Look for emission lines from the galaxies hosting DLAsDLA lines known from the literatureEmission properties and impact parameters
Main parts:
• Low redshift: Search for optical emission lines from known objects
• High redshift (z > 2): search for objects with Lyman- emission somewhere close to the QSO
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PMAS facts
Observations are done with:
PMAS= Potsdam Multi Aperture Spectrophotometer
16*16 fibres connected to lens array (no loss between fibres)
8”*8” field of view ( in our setup)
3.5 m telescope at Calar Alto, Spain
IFS advantages:
Imaging and spectrosopy simultaneously
No slit-losses
Pointing less crucial
Spectral resolution independent on spatial sampling and seeing
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Method
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Visualisation – long slits
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Visualisation – narrow bands - cubes
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Movies….
Looping through a cube ofQ2233+131,Sub-DLA @ z =3.15
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Candidate DLA galaxies
High redshift DLAs
13 DLAs included in the survey (+ 7 sub-DLAs) towards 9 QSOs
8 good candidates found – but only candidates
Line flux in the range 3-10*10-17erg cm-2 s-
1
Impact parameters from 1 - 4” (10 - 40 kpc)
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Results; Line fluxes ; Velocities; Metallicities ; Impact parameters
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Results; Line fluxes ; Velocities; Metallicities ; Impact parameters
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Results; Line fluxes ; Velocities; Metallicities ; Impact parameters
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Results; Line fluxes ; Velocities; Metallicities ; Impact parameters
Exponential fit
Scale length
kpc
kpc
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ConclusionsFollow-up slit spectra needed
Impact parameters consistent with large disks
Fluxes rather large – Ly properties consistent with those of previously identified DLA galaxies
No preference for candidates from high metallicity DLAs
Integral field spectroscopy is suited for the project
With 8-m class telescopes identification of DLA galaxies will be trivial
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Identifying emission lines
16 spectra
Emission from QSO
Emission line candidate
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Results; Flux ; Velocities; Metallicities ; Impact parameters
Power-law fit : b/b*=(N(H)/N(H)*) b*= kpc, =0.220.18