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Titolo:
Multiband optical polarimetry of BL Lacertae objects with the Nordic Optical Telescope
Autore:
Tommasi, L; Palazzi, E; Pian, E; Piirola, V; Poretti, E; Scaltriti, F; Sillanpaa, A; Takalo, L; Treves, A;
Indirizzi:
Osserv Astron Trieste, I-34131 Trieste, Italy Osserv Astron Trieste Trieste Italy I-34131 este, I-34131 Trieste, Italy CNR, ITESRE, I-40129 Bologna, Italy CNR Bologna Italy I-40129CNR, ITESRE, I-40129 Bologna, Italy Univ Milan, Dipartimento Fis, I-20133 Milan, Italy Univ Milan Milan Italy I-20133 n, Dipartimento Fis, I-20133 Milan, Italy Tuorla Observ, Piikkio 21500, Finland Tuorla Observ Piikkio Finland 21500 uorla Observ, Piikkio 21500, Finland Osserv Astron Brera, I-23807 Merate, Italy Osserv Astron Brera Merate Italy I-23807 on Brera, I-23807 Merate, Italy Osserv Astron Torino, I-10025 Pino Torinese, Italy Osserv Astron Torino Pino Torinese Italy I-10025 25 Pino Torinese, Italy Univ Insubria, Dipartimento Sci, I-22100 Como, Italy Univ Insubria Como Italy I-22100 , Dipartimento Sci, I-22100 Como, Italy
Titolo Testata:
ASTRONOMY & ASTROPHYSICS
fascicolo: 1, volume: 376, anno: 2001,
pagine: 51 - 58
SICI:
1432-0746(200109)376:1<51:MOPOBL>2.0.ZU;2-Y
Fonte:
ISI
Lingua:
ENG
Soggetto:
UBVRI PHOTOPOLARIMETRIC OBSERVATIONS; ACTIVE GALACTIC NUCLEI; POLARIZATION MEASUREMENTS; CIRCULAR-POLARIZATION; INFRARED POLARIMETRY; VRI PHOTOMETRY; HOST GALAXIES; RADIO-SOURCES; BLAZARS; OJ-287;
Keywords:
polarization; radiation mechanisms : non-thermal; galaxies : active; BL Lacertae objects : general; BL Lacertae objects : individual : 3C 66A; BL Lacertae objects : individual : PKS 0735+178;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
56
Recensione:
Indirizzi per estratti:
Indirizzo: Pian, E Osserv Astron Trieste, I-34131 Trieste, Italy Osserv Astron Trieste Trieste Italy I-34131 34131 Trieste, Italy
Citazione:
L. Tommasi et al., "Multiband optical polarimetry of BL Lacertae objects with the Nordic Optical Telescope", ASTRON ASTR, 376(1), 2001, pp. 51-58

Abstract

Optical polarization of seven selected BL Lac objects in UBVRI bands was studied with the Nordic Optical Telescope from December 10-14, 1999. Two of them, 3C 66A and PKS 0735+178, were monitored for 4 nights for a total integration time of 4.75 and 5.5 hours, respectively. Other objects (1 Jy 0138-097, H 0414+009, PKS 0823-223, OJ287 and BL Lac) were observed sparsely during the run. Apart from PKS 0823-223 (more polarized than observed in the past), the sources show levels of flux and polarization consistent with results at previous epochs. 3C 66A and PKS 0735+178 were intensively observed during December 11 and 12 and exhibited variability of polarization, both oninternight and intranight time scales. Wavelength dependence of polarization has been investigated, as well as circular polarization. The results arediscussed within the standard model for BL Lacs.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 24/11/17 alle ore 17:29:57