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VERSION:2.0
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BEGIN:VEVENT
SUMMARY:Polarimetric Studies Galaxies
DTSTART:20251202T153000Z
DTEND:20251202T170000Z
DTSTAMP:20260630T170734Z
UID:2b383485-b64d-4b27-9e40-65e8a7dcdbcf
SEQUENCE:1
CREATED:20250912T101223Z
DESCRIPTION:Photopolarimetry provides unique insights into the composition
 \, structure\, and physical properties of interstellar dust in galaxies. T
 his thesis presents an extensive polarimetric analysis of supernova host g
 alaxies\, focusing on interstellar polarization (ISP)\, dust extinction pr
 operties\, and the alignment of magnetic fields. Within dust environments 
 light can be polarized by scattering off dust grains or by absorption of s
 pheroidal grains aligned by an external magnetic field. Radiative transfer
  simulations were realized to provide expectations for the polarization of
  light due to scattering off different types of dust environments. Observa
 tions were conducted using VLTFORS2 polarimetric imaging\, and a robust da
 ta reduction sequence was developed to correct instrumental and interstell
 ar polarization effects. The results confirm the presence of an axisymmetr
 ic scattering pattern in multiple galaxies of our sample\, with a stronger
  effect in blue bands. Additionally\, the wavelength dependence of polariz
 ation follow either a U-shape or a monotonic increase\, in scattering-domi
 nated regions\, aligning with simulations for graphite and silicate grains
 \, respectively. Some observed polarization angle maps reveal alignment wi
 th spiral arms\, supporting theoretical predictions of magnetic field orie
 ntation. The Serkowski relation is confirmed in several regions\, allowing
  for precise determinations of the peak wavelength (λmax) and total-tosel
 ective extinction ratio (RV). These parameters exhibit spatial variations\
 , with RV being on average similar to that of the Milky Way ~3.1 in mid an
 d outer regions of host galaxies but displaying variations between arm and
  inter-arm regions. Milky Way ISP estimations align well with Planck obser
 vations\, though with notable differences in angle. Statistical comparison
 s indicate that polarization\, and in a few particular cases RV\, distribu
 tions vary across different galaxies\, emphasizing the complex interplay b
 etween dust grain properties and local interstellar environments. These fi
 ndings contribute to an expanded understanding of dust-induced polarizatio
 n in intragalactic environments.
LAST-MODIFIED:20250912T101223Z
LOCATION:Anfiteatro PA3 (Piso -1 do Pavilhão de Matemática) do IST
URL:http://df.vps.tecnico.ulisboa.pt/en/events/polarimetric-studies-galaxi
 es/
X-ALT-DESC;FMTTYPE=text/html:<p data-block-key="i7hf1">Photopolarimetry pr
 ovides unique insights into the composition\, structure\, and physical pro
 perties of interstellar dust in galaxies. This thesis presents an extensiv
 e polarimetric analysis of supernova host galaxies\, focusing on interstel
 lar polarization (ISP)\, dust extinction properties\, and the alignment of
  magnetic fields. Within dust environments light can be polarized by scatt
 ering off dust grains or by absorption of spheroidal grains aligned by an 
 external magnetic field. Radiative transfer simulations were realized to p
 rovide expectations for the polarization of light due to scattering off di
 fferent types of dust environments.<br/><br/> Observations were conducted 
 using VLTFORS2 polarimetric imaging\, and a robust data reduction sequence
  was developed to correct instrumental and interstellar polarization effec
 ts. The results confirm the presence of an axisymmetric scattering pattern
  in multiple galaxies of our sample\, with a stronger effect in blue bands
 . Additionally\, the wavelength dependence of polarization follow either a
  U-shape or a monotonic increase\, in scattering-dominated regions\, align
 ing with simulations for graphite and silicate grains\, respectively. Some
  observed polarization angle maps reveal alignment with spiral arms\, supp
 orting theoretical predictions of magnetic field orientation.<br/><br/> Th
 e Serkowski relation is confirmed in several regions\, allowing for precis
 e determinations of the peak wavelength (λmax) and total-toselective exti
 nction ratio (RV). These parameters exhibit spatial variations\, with RV b
 eing on average similar to that of the Milky Way ~3.1 in mid and outer reg
 ions of host galaxies but displaying variations between arm and inter-arm 
 regions. Milky Way ISP estimations align well with Planck observations\, t
 hough with notable differences in angle. Statistical comparisons indicate 
 that polarization\, and in a few particular cases RV\, distributions vary 
 across different galaxies\, emphasizing the complex interplay between dust
  grain properties and local interstellar environments. These findings cont
 ribute to an expanded understanding of dust-induced polarization in intrag
 alactic environments.</p>
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