2013A&A...555A.134L


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.23CEST13:27:56

2013A&A...555A.134L - Astronomy and Astrophysics, volume 555A, 134-134 (2013/7-1)

Two-year monitoring of intra-day variability of quasar 1156+295 at 4.8 GHz.

LIU B.-R., LIU X., MARCHILI N., LIU J., MI L.-G., KRICHBAUM T.P., FUHRMANN L. and ZENSUS J.A.

Abstract (from CDS):

The quasar 1156+295 (4C +29.45) is one of the targets in the Urumqi monitoring program which aimed to search for evidence of annual modulation in the timescales of intra-day variable (IDV) sources. The IDV observations of 1156+295 were carried out nearly monthly from October 2007 to October 2009, with the Urumqi 25 m radio telescope at 4.8GHz. The source has shown prominent IDV of total flux density in most observing sessions with variability timescales of ≤1 day at 4.8GHz. The estimated IDV timescales seem to follow an annual cycle that can be fitted with an anisotropic interstellar scintillation model suggesting that a significant part of the flux density variations is due to ISS. The source underwent a dramatic flare in 2008. We studied the possible consequences of the flare on the IDV of 1156+295 by comparing the changes in its IDV characteristics with the evolution of the 43GHz Very Long Baseline Array core size of the source. The quasar 1156+295 shows evidence for an annual modulation of its IDV timescales at 4.8 GHz, the ISS-induced IDV timescales and variability strength might be affected by the overall activity state of the source core. More frequent IDV and VLBI measurements are required to confirm the relation between the IDV appearance and the core-size evolution of the source.

Abstract Copyright:

Journal keyword(s): quasars: individual: 4C +29.45 - radio continuum: galaxies - galaxies: jets - ISM: structure - scattering

VizieR on-line data: <Available at CDS (J/A+A/555/A134): table3.dat>

Simbad objects: 8

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Number of rows : 8

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 QSO B0405-385 QSO 04 06 59.03533560 -38 26 28.0423567   19.55 18.0     ~ 197 2
2 8C 0716+714 BLL 07 21 53.4484901266 +71 20 36.362058601   15.5 14.17 14.27   ~ 1100 1
3 6C 091739+622838 QSO 09 21 36.23106854 +62 15 52.1803472   19.76 19.26 18.96   ~ 306 1
4 6C 095456+654857 BLL 09 58 47.2452838930 +65 33 54.821524491     17.0 15.75   ~ 605 1
5 QSO J1128+592 QSO 11 28 +59.2           ~ 7 0
6 Ton 599 QSO 11 59 31.83390975 +29 14 43.8268741   14.80 14.41 17.652 13.39 ~ 781 1
7 [VV98] J130042.4-325312 QSO 13 00 42.4254849462 -32 53 12.118806423     18.70 18   ~ 70 0
8 ICRF J181926.5+384501 SyG 18 19 26.54737811 +38 45 01.7863328           ~ 105 0

    Equat.    Gal    SGal    Ecl

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2019.10.23-13:27:56

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