2007A&A...467..465C


C.D.S. - SIMBAD4 rel 1.7 - 2019.11.16CET01:19:42

2007A&A...467..465C - Astronomy and Astrophysics, volume 467, 465-483 (2007/5-4)

Ten-year optical monitoring of PKS 0735+178: historical comparison, multiband behavior, and variability timescales.

CIPRINI S., TAKALO L.O., TOSTI G., RAITERI C.M., FIORUCCI M., VILLATA M., NUCCIARELLI G., LANTERI L., NILSSON K. and ROS J.A.

Abstract (from CDS):

New data and results on the optical behavior of the prominent blazar PKS 0735+178 (also known as OI 158, S3 0735+17, DA 237, 1ES 0735+178, 3EG J0737+1721) are presented, through the most continuous BVRI data available in the period 1994-2004 (about 500 nights of observations). In addition, the whole historical light curve, and a new photometric calibration of comparison stars in the field of this source are reported. Several methods for time series analysis of sparse data sets are developed, adapted, and applied to the reconstructed historical light curve and to each observing season of our unpublished optical database on PKS 0735+178. Optical spectral indexes are calculated from the multi-band observations and studied on long-term (years) durations as well. For the first time in this source, variability modes, characteristic timescales, and the signal power spectrum are explored and identified over 3 decades in time with sufficient statistics. The novel investigation of mid-term optical scales (days, weeks), could be also applied and compared to blazar gamma-ray light curves that will be provided, on the same timescales, by the forthcoming GLAST observatory. In the last 10 years the optical emission of PKS 0735+178 exhibited a rather achromatic behavior and a variability mode resembling the shot-noise. The source was at an intermediate or low brightness level, showing a mild flaring activity and a superimposition/succession of rapid and slower flares, without extraordinary and isolated outbursts, but, at any rate, characterized by one major active phase in 2001. Several mid-term scales of variability were found, the more common falling into duration intervals of about 27-28 days, 50-56 days and 76-79 days. Rapid variability in the historical light curve appears to be modulated by a general, slower, and rather oscillating temporal trend, where typical amplitudes of about 4.5, 8.5, and 11-13 years can be identified. This spectral and temporal analysis, accompanying our data publication, suggests the occurrence of distinctive signatures at mid-term durations that can likely be of transitory nature. On the other hand the possible pseudo-cyclical or multi-component modulations at long times could be more stable, recurrent and correlated to the bimodal radio flux behavior and the twisted radio structure observed over several years in this blazar.

Abstract Copyright:

Journal keyword(s): BL Lacertae objects: individual: PKS 0735+178 - BL Lacertae objects: general - galaxies: active - galaxies: photometry - methods: statistical

CDS comments: Fig.1, Table 1 star C1 is USNO-A2.0 1050-05294925 in Simbad, C2 is USNO-A2.0 1050-05296619, C4 is USNO-A2.0 1050-05297238, C7 is USNO-A2.0 1050-05299089, stars A to D are [W73] PKS 0735+17 A to [W73] PKS 0735+17 D.

Simbad objects: 11

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Number of rows : 11

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 8C 0716+714 BLL 07 21 53.4484901266 +71 20 36.362058601   15.5 14.17 14.27   ~ 1101 1
2 USNO-A2.0 1050-05294925 * 07 38 00.5709352391 +17 41 19.801349174   13.4 13.26 12.89 12.57 ~ 1 0
3 [W73] PKS 0735+17 C * 07 38 02.4888955321 +17 41 21.966734922   15.48 14.40 13.85 13.32 ~ 5 0
4 QSO J0738+1742 BLL 07 38 07.39374766 +17 42 18.9982302   16.76 16.22 15.78   ~ 887 1
5 USNO-A2.0 1050-05296579 * 07 38 08.3571919498 +17 44 59.152967340   16.48 15.80 15.49 15.12 ~ 5 0
6 2MASS J07380855+1740292 RG* 07 38 08.5551007298 +17 40 29.187869295   14.0 13.31 12.79 12.32 ~ 3 0
7 USNO-A2.0 1050-05297238 * 07 38 11.4856082486 +17 40 04.473209167   14.4 14.17 13.80 13.48 ~ 1 0
8 USNO-A2.0 1050-05299089 * 07 38 20.6320512347 +17 40 51.441208059   15.0 15.01 14.70 14.37 ~ 2 0
9 [W73] PKS 0735+17 A * 07 38 23.2914805675 +17 42 42.449890263   13.87 13.40 13.10 12.82 ~ 4 0
10 QSO J0854+2006 BLL 08 54 48.8749311881 +20 06 30.642936668   15.91 15.43 15.56   ~ 1945 1
11 NAME BL Lac BLL 22 02 43.2913773726 +42 16 39.978417860   15.66 14.72     ~ 1975 1

    Equat.    Gal    SGal    Ecl

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2019.11.16-01:19:42

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