2003A&A...400..487C


C.D.S. - SIMBAD4 rel 1.7 - 2019.12.08CET03:48:30

2003A&A...400..487C - Astronomy and Astrophysics, volume 400, 487-498 (2003/3-3)

Optical variability of the BL Lacertae object GC 0109+224. Multiband behaviour and time scales from a 7-years monitoring campaign.

CIPRINI S., TOSTI G., RAITERI C.M., VILLATA M., IBRAHIMOV M.A., NUCCIARELLI G. and LANTERI L.

Abstract (from CDS):

We present the most continuous data base of optical BVRcIc observations ever published on the BL Lacertae object GC 0109+224, collected mainly by the robotic telescope of the Perugia University Observatory in the period November 1994-February 2002. These observations have been complemented by data from the Torino Observatory, collected in the period July 1995-January 1999, and Mt. Maidanak Observatory (December 2000). GC 0109+224 showed rapid optical variations and six major outbursts were observed at the beginning and end of 1996, in fall 1998, at the beginning and at the end of 2000, and at the beginning of 2002. Fast and large-amplitude drops characterized its flux behaviour. The Rc magnitude ranged from 13.3 (16.16mJy) to 16.46 (0.8mJy), with a mean value of 14.9 (3.38mJy). In the periods where we collected multi-filter observations, we analyzed colour and spectral indexes, and the variability patterns during some flares. The long-term behaviour seems approximatively achromatic, but during some isolated outbursts we found evidence of the typical loop-like hysteresis behaviour, suggesting that rapid optical variability is dominated by non-thermal cooling of a single emitting particle population. We performed also a statistical analysis of the data, through the discrete correlation function (DCF), the structure function (SF), and the Lomb-Scargle periodogram, to identify characteristic times scales, from days to months, in the light curves, and to quantify the mode of variability. We also include the reconstruction of the historical light curve and a photometric calibration of comparison stars, to favour further extensive optical monitoring of this interesting blazar.

Abstract Copyright:

Journal keyword(s): BL Lacertae objects: individual: GC 0109+224 - BL Lacertae objects: general - quasars: general - galaxies: photometry - methods: statistical

CDS comments: Fig.1, Table 1: comparison stars format 'A' are '[MMM83] 0109+22 A' in SIMBAD, star 'C1' = 'EQ J011200.3+224522.3' in SIMBAD.

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 EQ J011200.3+224522.3 * 01 12 00.3 +22 45 22   16.30 15.28     ~ 1 0
2 QSO B0109+224 BLL 01 12 05.8246825085 +22 44 38.786096536   16.00 15.66 15.47   ~ 286 2
3 QSO B0235+1624 BLL 02 38 38.93010 +16 36 59.2746   16.46 15.50 15.92   ~ 1368 2
4 QSO B0323+022 BLL 03 26 13.9474696478 +02 25 14.675022985   17.05 16.55 15.3   ~ 220 1
5 QSO J0854+2006 BLL 08 54 48.8749311881 +20 06 30.642936668   15.91 15.43 15.56   ~ 1949 1
6 Mrk 421 BLL 11 04 27.3139210166 +38 12 31.798324828   13.50 12.90 8.31   ~ 2333 1
7 6C 121520+302351 BLL 12 17 52.0819140772 +30 07 00.636792927   16.07 15.62 13.47   ~ 393 1
8 7C 1219+2830 BLL 12 21 31.6902446545 +28 13 58.500383827   16.81 16.11 14.24   ~ 763 1
9 3C 273 BLL 12 29 06.6996828061 +02 03 08.598846466   13.05 14.830 14.11   ~ 5251 1
10 QSO B2155-304 BLL 21 58 52.0651817803 -30 13 32.120657891   13.36 13.09 12.62   ~ 1520 1
11 NAME BL Lac BLL 22 02 43.2913773726 +42 16 39.978417860   15.66 14.72     ~ 1976 1

    Equat.    Gal    SGal    Ecl

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2019.12.08-03:48:30

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