1994A&A...284..764B


C.D.S. - SIMBAD4 rel 1.7 - 2021.05.09CEST09:04:09

1994A&A...284..764B - Astronomy and Astrophysics, volume 284, 764-776 (1994/4-3)

The Hamburg Quasar Monitoring program (HQM) at Calar Alto I. Low amplitude variability in quasars.

BORGEEST U. and SCHRAMM K.-J.

Abstract (from CDS):

HQM is an optical broad-band photometric monitoring program carried out since Sept. 1988. Our main intention is to search for indications of microlensing in a sample of ∼100 selected quasars; however, we also want to study the intrinsic variability. We use a CCD camera equipped to the MPIA 1.2m telescope. Fully automatic photometric reduction relative to stars in the frame is done within a few minutes after each exposure, thus interesting brightness changes can be followed in detail. The typical photometric error is 1-2% for a 17.5mag quasar, making HQM the most accurate long-term quasar monitoring program yet carried out. The main results of HQM which we discuss here are: (1) Concerning variability, quasars form two, clearly distinct classes, optically violent variables (OVVs) and non-OVVs. (2) All OVVs are radio loud and probably belong to the blazar class. (3) Non-OVVs have lightcurve gradients of at most several 0.1mag/yr in the quasar restframe and can be well fitted by polynomials of low order. (4) Although our data cover only a relatively short timespan, we conclude that there is a large fraction of quasars which would be undetectable in photographic surveys using optical variability alone as the selection criterium. (5) A broad class of flat-spectrum radio quasars are no blazars, they are even less variable in the optical than radio quiet objects. (6) There is some statistical evidence for microlensing in our sample; if present it does, however, lead only to low lightcurve gradients.

Abstract Copyright:

Journal keyword(s): techniques: photometric - quasars: general - gravitational lenses

Simbad objects: 48

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Number of rows : 48

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 2E 12 Sy1 00 05 59.2379634379 +16 09 49.023089304   16.51 16.40     ~ 269 1
2 LBQS 0007-0004 QSO 00 10 16.4978440931 +00 12 27.680293148   17 17.0     ~ 51 0
3 LBQS 0013-0029 QSO 00 16 02.4050445836 -00 12 25.076529860   18.67 18.36     ~ 181 0
4 4C -02.04B QSO 00 41 26.0085368274 -01 43 15.683086954   16 15.0     ~ 92 2
5 LBQS 0058+0155 QSO 01 00 54.1201344020 +02 11 36.334277171   17.48 17.16     ~ 160 0
6 QSO B0104+318 QSO 01 06 58.7025789346 +32 09 18.892221565   18.97 18.88     ~ 38 0
7 2E 503 Sy1 01 54 27.9923794588 +04 48 18.159306691   17.01 16.91     ~ 85 0
8 QSO B0153+744 BLL 01 57 34.9662542558 +74 42 43.219635727   16 16.0 16.7   ~ 200 1
9 QSO B0248+430 QSO 02 51 34.53674204 +43 15 15.8291997     18.0 13.72   ~ 198 1
10 QSO B0446-208 QSO 04 48 58.8150873856 -20 44 46.011013874     17     ~ 46 0
11 QSO B0454+0356 QSO 04 56 47.1747689004 +04 00 52.945030656   16.76 16.53 16.26   ~ 233 1
12 QSO B0731+653 QSO 07 36 21.2979100309 +65 13 12.006365459   19.10 18.5     ~ 45 1
13 2E 1877 Sy1 07 49 09.1316900209 +55 37 55.551039225   18.41 17.84     ~ 22 0
14 4C 05.34 QSO 08 07 57.5374925559 +04 32 34.541448939   18.53 18.16     ~ 191 1
15 3C 196 Sy1 08 13 36.056090 +48 13 02.63597   18.36 17.79     ~ 491 2
16 4C 71.07 QSO 08 41 24.36526906 +70 53 42.1730054     16.5 16.8   ~ 711 1
17 QSO B0903+1734 QSO 09 06 38.1896175617 +17 22 23.424022505   17.3 18.0     ~ 59 0
18 Ton 469 Sy1 09 58 20.9495949602 +32 24 02.209578357   15.88 15.78 15.51   ~ 405 1
19 Ton 490 QSO 10 13 53.42876682 +24 49 16.4407698   16.59 16.57 15.85   ~ 175 1
20 QSO B1109+357 QSO 11 12 06.9454080988 +35 27 41.243660154   17.53 17.30     ~ 34 0
21 LB 2136 QSO 11 53 24.46663282 +49 31 08.8301947   17.94 17.66     ~ 438 1
22 LBQS 1209+1046 QSO 12 11 40.6044459296 +10 30 02.077569939   18.52 18.37     ~ 107 0
23 Ton 1530 QSO 12 25 27.3985176122 +22 35 13.016993055   15.49 17.00     ~ 182 0
24 LB 685 QSO 13 34 11.7017943959 +55 01 24.869305608   18.79 18.45     ~ 90 1
25 QSO B1421+331 QSO 14 23 26.0579478241 +32 52 20.360753583   16.99 16.70     ~ 106 0
26 8C 1435+638 QSO 14 36 45.8021364767 +63 36 37.865982148   17.06 16.86 16.23   ~ 193 1
27 QSO B1520+41 QSO 15 22 19.7853040912 +41 11 56.266636704   18 18.5     ~ 20 0
28 QSO B1521+1009 QSO 15 24 24.5235638849 +09 58 29.086612264   15.74 16.2     ~ 115 0
29 QSO B1604+290 QSO 16 06 55.9496649751 +28 55 19.139382398     17.0     ~ 29 0
30 QSO B1630+3744 QSO 16 32 01.1118986024 +37 37 49.980862599   16.50 16.30     ~ 164 0
31 QSO B1634+7037 QSO 16 34 28.9917493918 +70 31 32.394595988   14.90 14.66     ~ 260 0
32 QSO B1633+267 QSO 16 35 38.1694977937 +26 38 27.414888096   19.2 17     ~ 15 0
33 QSO B1640+396 QSO 16 41 47.5394411699 +39 35 03.328547314   20.01 19.83     ~ 59 1
34 HS 1700+6416 QSO 17 01 00.6195618802 +64 12 09.118927057   16.39 16.17     ~ 348 0
35 2MASX J17021115+6058480 Sy1 17 02 11.1389038162 +60 58 48.048012343   19.21 18.50     ~ 41 0
36 2A 1705+609 Sy1 17 04 41.3742389551 +60 44 30.522600868   15.65 15.40 15.30   ~ 728 1
37 QSO J1716+5328 QSO 17 16 35.5678393946 +53 28 15.827636771   16.30 16.48     ~ 68 0
38 QSO J1719+4804 QSO 17 19 38.2496689104 +48 04 12.245390013   15.33 14.60 14.25   ~ 174 1
39 QSO B1741-038 QSO 17 43 58.85613396 -03 50 04.6166450     18.5 17.98   ~ 486 1
40 ClG 1821+64 ClG 18 21 56.7276 +64 20 55.841           ~ 494 1
41 2E 4066 Sy1 18 21 57.2365 +64 20 36.226   14.23 14.24     ~ 547 1
42 4C 56.28 QSO 18 58 26.9534391717 +56 45 56.636824490     17.3     ~ 68 1
43 QSO B2126-15 QSO 21 29 12.17589777 -15 38 41.0413097   17.61 17.3 17.3   ~ 472 1
44 QSO B2134+0028 QSO 21 36 38.5862648232 +00 41 54.210724774   17.30 17.08 17.02   ~ 531 2
45 2MASX J22174771-0332380 Sy1 22 17 47.7282911170 -03 32 38.438394671   17.25 17.20 17.37   ~ 56 0
46 4C 24.61 QSO 22 54 09.3419014 +24 45 23.423210     17.8     ~ 137 1
47 4C 09.72 BLL 23 11 17.7543884785 +10 08 15.754791578   16.15 16.00     ~ 183 1
48 4C 14.85 QSO 23 57 18.3891089566 +14 46 09.848716233   19.06 18.97     ~ 95 2

    Equat.    Gal    SGal    Ecl

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2021.05.09-09:04:09

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