2009MNRAS.399.1622G


Query : 2009MNRAS.399.1622G

2009MNRAS.399.1622G - Mon. Not. R. Astron. Soc., 399, 1622-1632 (2009/November-1)

Unusual optical quiescence of the classical BL Lac object PKS 0735+178 on intranight time-scale.

GOYAL A., GOPAL-KRISHNA, ANUPAMA G.C., SAHU D.K., SAGAR R., BRITZEN S., KAROUZOS M., ALLER M.F. and ALLER H.D.

Abstract (from CDS):

We present the result of our extensive intranight optical monitoring of the well-known low-energy peaked BL Lac (LBL) object PKS 0735+178. This long-term follow-up consists of R-band monitoring for a minimum duration of ∼4 hours, on 17 nights spanning 11 years (1998-2008). Using the CCD as an N-star photometer, a detection limit of around 1 per cent was attained for the intranight optical variability (INOV). Remarkably, an INOV amplitude of ≥3 per cent on hour-like time-scale was not observed on any of the 17 nights, even though the likelihood of a typical LBL showing such INOV levels in a single session of ≳4 hours duration is known to be high (∼50 per cent). Our observations have thus established a peculiar long-term INOV quiescence of this radio-selected BL Lac object. Moreover, the access to unpublished optical monitoring data of similarly high sensitivity, acquired in another programme, has allowed us to confirm the same anomalous INOV quiescence of this LBL all the way back to 1989, the epoch of its historically largest radio outburst. Here, we present observational evidence revealing the very unusual INOV behaviour of this classical BL Lac object and discuss this briefly in the context of its other known exceptional properties.

Abstract Copyright: © 2009 The Authors. Journal compilation © 2009 RAS

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

Simbad objects: 12

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Number of rows : 12
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 USNO-B1.0 1076-00175393 * 07 37 48.2012882496 +17 40 14.171738520   16.1   14.9   ~ 1 0
2 USNO-B1.0 1076-00175395 * 07 37 48.8904720096 +17 41 30.308277984   16.2   15.3   ~ 1 0
3 USNO-B1.0 1077-00176964 * 07 38 03.4253910840 +17 42 55.531186308   16.5   15.9   ~ 1 0
4 QSO J0738+1742 BLL 07 38 07.3935719136 +17 42 18.998218764   16.76 16.22 15.78   ~ 944 1
5 USNO-A2.0 1050-05296579 * 07 38 08.3573358024 +17 44 59.152702092   16.48 15.80 15.49 15.12 ~ 6 0
6 USNO-B1.0 1077-00177014 * 07 38 10.2653711328 +17 43 43.639275684   16.7   16.5   ~ 1 0
7 USNO-B1.0 1076-00175542 * 07 38 12.1450567536 +17 38 07.310339052   15.6   15.2   ~ 1 0
8 USNO-B1.0 1076-00175553 * 07 38 13.8231074496 +17 38 22.782680664   15.3   14.7   ~ 1 0
9 USNO-B1.0 1076-00175571 * 07 38 17.0855130456 +17 39 03.571810560   16.3   16.0   ~ 1 0
10 USNO-A2.0 1050-05299089 * 07 38 20.6320256760 +17 40 51.440948940   15.0 15.01 14.70 14.37 ~ 2 0
11 USNO-B1.0 1076-00175635 * 07 38 26.0053123800 +17 40 22.459456056   16.1   15.6   ~ 1 0
12 6C 091739+622838 QSO 09 21 36.2303190408 +62 15 52.181600580   19.76 19.26 18.96   ~ 333 1

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2022.08.11-07:30:49

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