J/AJ/166/34 Interstellar Polarization Survey. III. (Angarita+, 2023)
Interstellar Polarization Survey.
III. Relation between Optical Polarization and Reddening in the General
Interstellar Medium.
Angarita Y., Versteeg M.J.F., Haverkorn M., Rodrigues C.V.,
Magalhaes A.M., Santos-Lima R., Kawabata K.S.
<Astron. J., 166, 34 (2023)>
=2023AJ....166...34A 2023AJ....166...34A
ADC_Keywords: Stars, variable; Interstellar medium
Keywords: Starlight polarization ; Optical observation ; Interstellar
medium ; Interstellar magnetic fields ; Interstellar dust ;
Interstellar dust extinction
Abstract:
Optical starlight can be partially polarized while propagating through
the dusty, magnetized interstellar medium (ISM). The polarization
efficiency describes the polarization intensity fraction per reddening
unit, PV/E(B-V), related to the interstellar dust grains and magnetic
field properties. The maximum value observed, [PV/E(B-V)]max, is thus
achieved under optimal polarizing conditions of the ISM. Therefore,
the analysis of polarization efficiency observations across the Galaxy
contributes to the study of magnetic field topology, small-scale
magnetic fluctuations, grain-alignment efficiency, and composition.
Infrared observations from Planck satellite have set [PV/E(B-V)]max to
13%/mag. However, recent optical polarization observations in Planck's
highly polarized regions showed polarization efficiency values between
13.6%/mag and 18.2%/mag (depending on the extinction map used),
indicating that [PV/E(B-V)]max is not well constrained yet. We used
V-band polarimetry of the Interstellar Polarization Survey (consisting
of ∼10500 high-quality observations distributed in 34 fields of
0.3degx0.3deg) to accurately estimate the polarization efficiency in
the ISM. We estimated the upper limit of PV/E(B-V) with the weighted
99th percentile of the field. In five regions, the polarization
efficiency upper limit is above 13% mag-1. Furthermore, we found
[PV/E(B-V)]max=15.8-0.9+1.3%/mag using diffuse
intermediate-latitude (|b|>7.5deg) regions with apparently strong
regular Galactic magnetic field in the plane-of-sky. We studied the
variations of PV/E(B-V) across the sky and tested toy models of
polarization efficiency with Galactic longitude that showed some
correspondence with a uniform spiral magnetic field.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 65 317 Variable stars in IPS-GI catalog
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See also:
II/226 : Stellar polarization catalogs agglomeration (Heiles, 2000)
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
I/350 : Gaia EDR3 (Gaia Collaboration, 2020)
II/366 : ASAS-SN catalog of variable stars (Jayasinghe+, 2018-2020)
I/354 : StarHorse2, Gaia EDR3 photo-astrometric distances (Anders+, 2022)
VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)
J/A+A/453/635 : Modelling Galactic Interstellar Extinction (Marshall+, 2006)
J/ApJ/665/369 : Photopolarimetry of Southern Coalsack stars (Andersson+, 2007)
J/AJ/156/241 : 1st catalog variable stars measured by ATLAS (Heinze+, 2018)
J/A+A/625/A135 : Galac interstellar dust Gaia-2MASS 3D maps (Lallement+, 2019)
J/A+A/624/L8 : Starlight polarization (Panopoulou+, 2019)
J/ApJ/906/73 : Total/polar extinct/emission PostPlanck Era (Hensley+, 2021)
J/A+A/649/A3 : Gaia Early Data Release3 photometric passbands (Riello+, 2021)
J/A+A/661/A147 : Galactic interstellar dust Gaia-2MASS 3Dmap (Lallement+, 2022)
J/A+A/664/A174 : Galactic interstellar dust Gaia-2MASS 3D maps (Vergely+, 2022)
Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 19 A19 --- Gaia Gaia-EDR3 source identifier
21- 29 F9.5 deg RAdeg [105/284] Right Ascension (J2000)
31- 40 F10.6 deg DEdeg [-72/10] Declination (J2000)
42- 43 I2 --- Field [0/58] IPS-GI field ID from
Versteeg+, 2023AJ....165...87V 2023AJ....165...87V
45- 63 A19 --- Class ? Database classification (1)
65- 65 I1 --- Ref [1/3] Source database reference (2)
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Note (1): Some objects were found in more than one catalog, hence, they have
more than one classification and reference. Therefore, different
rows were assigned to those sources' ids and coordinates.
Note (2): References as follows:
1 = ASAS-SN, Jayasinghe+, 2018,II/366; 2019MNRAS.486.1907J 2019MNRAS.486.1907J,
2019MNRAS.485..961J 2019MNRAS.485..961J, and 2020MNRAS.491...13J 2020MNRAS.491...13J
2 = ATLAS-VAR, Heinze+, 2018, J/AJ/156/241
3 = Gaia-DR3 variable stars, Eyer+, 2022arXiv220606416E 2022arXiv220606416E
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History:
From electronic version of the journal
References:
Versteeg et al. Papaer II : 2023AJ....165...87V 2023AJ....165...87V
(End) Prepared by [AAS], Coralie Fix [CDS], 15-Apr-2024