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Impact of seeing and host galaxy into the analysis of photo-polarimetric microvariability in blazars - Case study of the nearby blazars 1ES 1959+650 and HB89 2201+044
- Source :
- Sosa, M S, von Essen, C, Andruchow, I & Cellone, S A 2017, ' Impact of seeing and host galaxy into the analysis of photo-polarimetric microvariability in blazars Case study of the nearby blazars 1ES 1959+650 and HB89 2201+044 ', Astronomy & Astrophysics, vol. 607, 49 . https://doi.org/10.1051/0004-6361/201629823, CONICET Digital (CONICET), Consejo Nacional de Investigaciones Científicas y Técnicas, instacron:CONICET, SEDICI (UNLP), Universidad Nacional de La Plata, instacron:UNLP
- Publication Year :
- 2017
-
Abstract
- Blazars, a type of Active Galactic Nuclei, present a particular orientation of their jets close to the line ofsight. Their radiation is thus relativistically beamed, giving rise to extreme behaviors, specially strong variability on very short time-scales (i.e., microvariability). Here we present simultaneous photometric and polarimetric observations of two relatively nearby blazars, 1ES 1959+650 and HB89 2201+044, that were obtained using the Calar Alto Faint Object Spectrograph mounted at the 2.2 m telescope in Calar Alto, Spain. An outstanding characteristic of these two blazars is the presence of well resolved host galaxies. This particular feature allows us to produce a study of their intrinsic polarization, a measurement of the polarization state of the galactic nucleus unaffected by the host galaxy. To carry out this work, we computed photometric fluxes from which we calculated the degree and orientation of the blazars polarization. Then, we analyzed the depolarizing effect introduced by the host galaxy with the main goal to recover the intrinsic polarization of the galactic nucleus, carefully taking into consideration the spurious polarimetric variability introduced by changes in seeing along the observing nights. We find that the two blazars do not present intra-night photo-polarimetric variability, although we do detect a significant inter-night variability. Comparing polarimetric values before and after accounting for the host galaxies, we observe a significant difference in the polarization degree of about 1 % in the case of 1ES 1959+650, and 0.3 % in the case of HB89 2201+044, thus evidencing the non-negligible impact introduced by the host galaxies. We note that this host galaxy effect depends on the weaveband, and varies with changing seeing conditions, so it should be particularly considered when studying frequency-dependent polarization in blazars.<br />11 pages, 8 figures
- Subjects :
- Ciencias Astronómicas
EXTRAGALACTIC SOURCES
Ciencias Físicas
Astrophysics
OPTICAL LINEAR-POLARIZATION
01 natural sciences
law.invention
purl.org/becyt/ford/1 [https]
INDIVIDUAL: HB89 2201+044 [BL LACERTAE OBJECTS]
law
galaxies
010303 astronomy & astrophysics
ACTIVE [GALAXIES]
Physics
Line-of-sight
Faint Object Spectrograph
Astrophysics::Instrumentation and Methods for Astrophysics
Polarization (waves)
QUASARS
BL Lacertae objects
Astrophysics::Earth and Planetary Astrophysics
CIENCIAS NATURALES Y EXACTAS
Active galactic nucleus
Astrophysics::High Energy Astrophysical Phenomena
Polarimetry
FOS: Physical sciences
Astrophysics::Cosmology and Extragalactic Astrophysics
Telescope
photometric
0103 physical sciences
Blazar
Astrophysics::Galaxy Astrophysics
INTRADAY VARIABILITY
POLARIMETRIC [TECHNIQUES]
RADIO
010308 nuclear & particles physics
ERROR ANALYSIS
Astronomy and Astrophysics
purl.org/becyt/ford/1.3 [https]
PHOTOMETRIC [TECHNIQUES]
BL-LACERTAE OBJECTS
Astrophysics - Astrophysics of Galaxies
Galaxy
Astronomía
INDIVIDUAL: 1ES 1959+650 [BL LACERTAE OBJECTS]
Space and Planetary Science
Astrophysics of Galaxies (astro-ph.GA)
LAC OBJECTS
polarimetric
POINT
STARS
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Journal :
- Sosa, M S, von Essen, C, Andruchow, I & Cellone, S A 2017, ' Impact of seeing and host galaxy into the analysis of photo-polarimetric microvariability in blazars Case study of the nearby blazars 1ES 1959+650 and HB89 2201+044 ', Astronomy & Astrophysics, vol. 607, 49 . https://doi.org/10.1051/0004-6361/201629823, CONICET Digital (CONICET), Consejo Nacional de Investigaciones Científicas y Técnicas, instacron:CONICET, SEDICI (UNLP), Universidad Nacional de La Plata, instacron:UNLP
- Accession number :
- edsair.doi.dedup.....8ecbef1d3dd0590d3578def12272bdce