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Polarimetry of the ...
Polarimetry of the Lyα envelope of the radio-quiet quasar SDSS J124020.91+145535.6
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North, P. (författare)
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- Hayes, Matthew J., 1977- (författare)
- Stockholms universitet,Institutionen för astronomi
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Millon, M. (författare)
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Verhamme, A. (författare)
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Trebitsch, M. (författare)
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Blaizot, J. (författare)
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Courbin, F. (författare)
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Chelouche, D. (författare)
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(creator_code:org_t)
- 2024
- 2024
- Engelska.
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Ingår i: Astronomy and Astrophysics. - 0004-6361 .- 1432-0746. ; 684
- Relaterad länk:
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https://doi.org/10.1...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- The radio quiet quasar SDSS J1240+1455 lies at a redshift of z = 3.11, is surrounded by a Lyα blob (LAB), and is absorbed by a proximate damped Lyα system. In order to better define the morphology of the blob and determine its emission mechanism, we gathered deep narrow-band images isolating the Lyα line of this object in linearly polarized light. We provide a deep intensity image of the blob, showing a filamentary structure extending up to 16″ (or 122 physical kpc) in diameter. No significant polarization signal could be extracted from the data, but 95% probability upper limits were defined through simulations. They vary between ∼3% in the central 0.75″ disk (after subtraction of the unpolarized quasar continuum) and ∼10% in the 3.8 − 5.5″ annulus. The low polarization suggests that the Lyα photons are emitted mostly in situ, by recombination and de-excitation in a gas largely ionized by the quasar ultraviolet light, rather than by a central source and scattered subsequently by neutral hydrogen gas. This blob shows no detectable polarization signal, contrary to LAB1, a brighter and more extended blob that is not related to the nearby active galactic nucleus (AGN) in any obvious way, and where a significant polarization signal of about 18% was detected.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Nyckelord
- quasars: emission lines
- quasars: general
- quasars: individual: SDSS J124020.91+145535.6
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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