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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Multiwavelength monitoring of the BL lacertae object PKS 2155-304 in 1994 MAY. I. The ground-based campaign
Astrophysical Journal, Volume 486, No. 2 PART I, Year 1997
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Description
Optical, near-infrared, and radio observations of the BL Lac object PKS 2155-304 were obtained simultaneously with a continuous UV/EUV/X-ray monitoring campaign in 1994 May. Further optical observations were gathered throughout most of 1994. The radio, millimeter, and near-infrared data show no strong correlations with the higher energies. The optical light curves exhibit flickering of 0.2-0.3 mag on timescales of 1-2 days, superposed on longer timescale variations. Rapid variations of ∼0.01 mag minute-1, if real, are the fastest seen to date for any BL Lac object. Small (0.2-0.3 mag) increases in the V and R bands occur simultaneously with a flare seen at higher energies. All optical wave bands (UBVRI) track each other well over the period of observation, with no detectable delay. For most of the period the average colors remain relatively constant, although there is a tendency for the colors (in particular, B- V) to vary more when the source fades. In polarized light, PKS 2155 -304 showed strong color dependence (polarization increases toward the blue, Pv/PI = 1.31) and the highest optical polarization (U = 14.3%) ever observed for this source. The polarization variations trace the flares seen in the UV flux. For the fastest variability timescale observed, we estimate a central black hole mass of ≲1.5 × 109(δ/10) M⊙, consistent with UV and X-ray constraints and smaller than previously calculated for this object. © 1997. The American Astronomical Society. All rights reserved.
Authors & Co-Authors
Pesce, J.
United States, Baltimore
Space Telescope Science Institute
Urry, Claudia Megan
United States, Baltimore
Space Telescope Science Institute
Maraschi, Laura
Italy, Merate
Osservatorio Astronomico Di Brera
Treves, Aldo
Italy, Trieste
Scuola Internazionale Superiore Di Studi Avanzati
Italy, Milan
Università Degli Studi Di Milano
Grandi, Paola
Italy, Rome
Consiglio Nazionale Delle Ricerche
Kollgaard, Ronald I.
United States, University Park
Pennsylvania State University
United States, Batavia
Fermi National Accelerator Laboratory
Pian, Elena
United States, Baltimore
Space Telescope Science Institute
Smith, Paul S.
United States, Tucson
The University of Arizona
United States, Tucson
Kitt Peak National Observatory
Aller, Hugh D.
United States, Ann Arbor
University of Michigan, Ann Arbor
Aller, M. F.
United States, Ann Arbor
University of Michigan, Ann Arbor
Barth, Aaron J.
United States, Berkeley
University of California, Berkeley
Bucklev, David A.H.
South Africa, Cape Town
South African Astronomical Observatory
Covino, E.
Italy, Naples
Osservatorio Astronomico Di Capodimonte
Filippenko, Alexei V.
United States, Berkeley
University of California, Berkeley
Hooper, Eric J.
United States, Tucson
The University of Arizona
Joner, Michael D.
United States, Provo
Brigham Young University
Chile, La Serena
Cerro Tololo Inter American Observatory
Kedziora-Chudczer, Lucyna L.
Australia, Sydney
Australia Telescope National Facility
Kilkenny, David
South Africa, Cape Town
South African Astronomical Observatory
Knee, Lewis B.G.
Chile, Santiago
Swedish Eso Submillimetre Telescope
Kunkel, Michael
Sweden, Onsala
Onsala Space Observatory
Layden, Andrew C.
Germany, Heidelberg
Max Planck Institute for Astronomy
Canada, Hamilton
Mcmaster University
Magalhães, A. M.
Chile, La Serena
Cerro Tololo Inter American Observatory
Marang, Freddy
South Africa, Cape Town
South African Astronomical Observatory
Margoniner, Vera E.
Chile, La Serena
Cerro Tololo Inter American Observatory
Palma, Christopher
United States, University Park
Pennsylvania State University
Brazil, Sao Paulo
Universidade de São Paulo
Pereyra, Antonio
Chile, La Serena
Cerro Tololo Inter American Observatory
Rodrigues, Claudia V.
Chile, La Serena
Cerro Tololo Inter American Observatory
United States, Charlottesville
University of Virginia
Schutte, Andries
Brazil, Sao Jose Dos Campos
Instituto Nacional de Pesquisas Espaciais
South Africa, Ulundi
University of Zululand
Sitko, Michael L.
South Africa, Pretoria
Siemens Telecommunications
Tornikoski, Merja
United States, Cincinnati
University of Cincinnati
Van Der Walt, Johan Der
Finland, Espoo
Aalto University
van Wyk, François G.
South Africa, Cape Town
South African Astronomical Observatory
Whitelock, Patricia A.
South Africa, Cape Town
South African Astronomical Observatory
United States, Stony Brook
Stony Brook University
Wolk, Scott J.
Chile, La Serena
Cerro Tololo Inter American Observatory
South Africa, Potchefstroom
North-west University
Statistics
Citations: 34
Authors: 34
Affiliations: 29
Identifiers
Doi:
10.1086/304538
ISSN:
0004637X
e-ISSN:
15384357