Publications (as of January 18, 2011)
Refereed journals
1) Ulrich, M.-H., Fink, H.H., Schaeidt, S., et al. 1992,
"Multiwavelength observations of the quasar
Q1821+643 during the ROSAT All Sky Survey", A&A 266, 183
2) von Linde, A., Borgeest, U., Schramm, K.J.,
et al. 1993, "A rapid optical flare in the distant gamma-ray
source 0836+710", A&A 267, L23
3) Schramm, K.-J., Borgeest, U., Camenzind, M., et al.
1993,"Another active period in the
optical and radio lightcurves of the Blazar 3C 345: indications for a
'lighthouse effect' due to jet rotation", A&A 278, 391
4) Courvoisier, T.J.-L., Blecha, A., Bouchet, P., et al.
1994, "Multiwavelength monitoring of the
BL Lacertae object PKS 2155-304. III. Ground-based observations
in November 1991", ApJ 438, 108
5) Edelson, R., Krolik, J., Madejski, G., et al.
1994,
"Multiwavelength monitoring of the BL Lacertae object PKS 2155-304.
IV. Multiwavelength analysis.", ApJ 438, 120
6) Treves, A., Fink, H.H., Malkan, M., et al.
1995, "Multifrequency observations of KAZ 102
during the ROSAT All Sky Survey", ApJ 442, 589
7) Wagner, S.J., Mattox, et al.
1995, "High-energy gamma-rays from PKS 1406-076 and the observation
of correlated gamma-ray and optical emission", ApJ 454, L97
8) Sillanpää, A., Takalo, L.O., Pursimo, T., et al.
1996, "Confirmation of the 12 year optical
outburst cycle in blazar OJ 287", A&A 305, L17
9) Heidt, J., Wagner, S.J. 1996, "Statistics of
optical intraday variability in a complete sample of radio-selected
BL Lac objects", A&A 305, 42
10) Benitez, E., Dultzin-Hacyan, D., Heidt, J., et al.
1996,
"The close environment of OJ 287: underlying nebulosity and
a possible optical jet", ApJ 464, L47
11) Wagner, S.J., Witzel, A., Heidt, et al.
1996, "Rapid variability in S5 0716+714 across the electromagnetic
spectrum", AJ 111, 2187
12) Heidt, J., Nilsson, K., Pursimo, T.,
Takalo, L.O., Sillanpää, A.
1996, "Possible absorbing systems towards the BL Lacertae object
PKS 0139-097", A&A 312, L13
13) von Linden, S., Reuter, H.-P., Heidt, J., Wielebinski, R.,
Pohl, M. 1996, "The dynamics of the inner part of NGC 7331",
1996, A&A 315, 52
14) Sillanp&aunl;ä, A., Takalo, L.O., Pursimo, T., et al.
Nilsson, K.,
1996, "Double-peak structure in the cyclic
outbursts of blazar OJ 287", 1996, A&A 315, L13
15) Takalo, L.O., Sillanpää, A., Lehto, H.J., et al.
1996, "Monitoring of
3C 66A during an extended outburst. I. The light curves", A&AS 120,313
16) Falomo, R., Kotilainen, J., Pursimo, et al.
1997, On the galaxy surrounding the BL Lac
object MS 0205.7+3509 , A&A 321,374
17) Zickgraf, F.-J., Thiering, I., Krautter, J., et al.
1997, "Identifikation of a complete sample of northern
ROSAT All-Sky Survey X-ray sources. II. The optical observations",
A&AS 123,103
18) Heidt, J., Wagner, S.J., Wilhelm-Erkens, U. 1997,
"Optical and UV observations of the BL Lac object PKS 2155-304",
A&A 325, 27
19) Nilsson, K., Heidt, J., Pursimo, T., et al.
1997, "Discovery of an optical jet in the
BL Lacertae object 3C 371", ApJ 484, L107
20) Heidt, J., Wagner, S.J. 1998, "Intraday variability
in X-ray selected BL Lacertae objects", A&A 329, 853
21) Fuchs, B., Möllenhoff, C., Heidt, J. 1998, "Decomposition
of the rotation curves of distant field galaxies", A&A 336, 878
22) Shin, J.-Y., Gehrz, R.D., Jones, T.J., et al.
1998, "The shell of QU Vul at 2.2 µm,
Hα and 3.6cm , AJ 116, 1966
23) Gorosabel, J., Castro-Tirado, A.J., Wolf, C., et al.
1998, "An optical study of the GRB 970111
field beginning 19 hours after the gamma-ray burst", A&A 339, 719
24) Heidt, J., Nilsson, K., Sillanpää, A., Takalo, L.O.,
Pursimo, T. 1999, "High-resolution imaging of Einstein Slew Survey
BL Lacertae objects", A&A 341, 683
25) Castro-Tirado, A.J., Zapatero-Osorio, M.R., Gorosabel, J.,
et al. 1999, "The optical/IR counterpart of the
3 July 1998 gamma-ray burst and its evolution", ApJ 511, 85
26) Nilsson, K., Takalo, L.O., Pursimo, T., et al.
1999, "Discovery of a blue arc near the BL Lacertae object RGB 1745+398",
A&A 343, 81
27) Kraus, A., Quirrenbach, A., Lobanov, A., et al.
1999, "Unusual
radio variability in the BL Lac object AO 0235+164", A&A 344, 807
28) Heidt, J., Nilsson, K., Fried, J.W., Takalo, L.,
Sillanpää, A. 1999, "1ES 1741+196: a BL Lacertae object in a
triplet of interacting galaxies?", A&A 348, 113
29) Nilsson, K., Pursimo, T., Takalo, L.O., et al.
1999, "Two-dimensional photometric
decomposition of the TeV BL Lacertae objects Mkn 421, Mkn 501
and 1ES 2344+514", PASP 111, 1223
30) Möllenhoff, C., Appenzeller, I., Gässler, W., et al.
1999, "Morphological structure and colors of
NGC 1232 and NGC 1288", A&A 352, L5
31) Heidt, J., Nilsson, K., Appenzeller, I., et al.
Jäger, K., Seifert,
1999, "Observations of the host galaxies of the BL Lacertae
objects H 0414+009 and OJ 287 with FORS1 at VLT-UT1", A&A 352, L11
32) Jäger, K., Fricke, K.J., Appenzeller, I., et al.
Szeifert, T., 1999, "Imaging and spectroscopy
with FORS1 in the field of Q 0307-0015", A&A 352, L17
33) Pursimo, T., Takalo, L.O., Sillanpää, A., et al.
2000, "Intensive monitoring of OJ 287", A&AS 146, 141
34) Möllenhoff, C., Heidt, J. 2001, "Surface brightness
photometry of spiral galaxies in NIR: structural parameters of disks and
bulges", A&A 368, 16
35) Hartmann, R.C., Böttcher, M., Aldering, G.,
et al. 2001, "Multiepoch
multiwavelength spectra and models for Blazar 3C 279", ApJ 553, 683
36) Hartmann, R.C., Villata, M., Balonek, T.J.,
et al. 2001, "Day-scale variability
of 3C 279 and searches for correlations in Gamma-ray, X-ray and
optical bands", ApJ 558, 583
37) Schmid, H.M., Appenzeller, I., Camenzind, M., et al.
2001, "VLT-spectropolarimetry of the
high-polarization Seyfert I galaxy Fairall 51", A&A 372, 59
38) Raiteri, C. M., Villata, M., Aller, et al.
2001, "Optical and
radio variability of the BL Lacertae object AO 0235+164: a possible
5-6 year periodicity", A&A 377, 396
39) Ziegler, B.L., Böhm, A., Fricke, K.J., et al.
2002, "The evolution of the Tully-Fisher relation of Spiral galaxies",
ApJ 564, L69
40) Pursimo, T., Nilsson, K., Takalo, L.O., et al.
2002, "Deep optical imaging of radio selected
BL Lacertae objects", A&A 381, 810
41) Mehlert, D., Noll, S., Appenzeller, I., et al.
2002, "Evidence for chemical evolution in the spectra of high-redshift
galaxies", A&A 393, 809
42) Heidt, J.,
Appenzeller, I., Gabasch, A., et al.
2003, "The FORS Deep Field:
Field selection, photometric observations and photometric catalog",
A&A 398, 49
43) Dietrich, M., Appenzeller, I., Hamann, F., et al.
2003, "Elemental abundances
in the broad emission line region of
Quasars at redshifts larger than 4", A&A 398, 891
44) Dietrich, M., Hamann, F., Shields, J.C.,
2003, "Quasar elemental abundances
at high redshifts", ApJ 589, 722
45) Nilsson, K., Pursimo, T., Heidt, J.,
Takalo, L.O., Sillanpää, A. 2003,
"R-band imaging of the host galaxies of RGB BL Lacertae
objects", A&A 400, 95
46) Heidt, J., Jäger, K., Nilsson, K., et al.
2003, "The BL Lacertae object PKS 0537-441: extended
[O II] emission and a binary QSO?", A&A 406, 565
47) Ziegler, B.L., Böhm, A., Jäger, K., Heidt, J., Möllenhoff,
C. 2003, "Internal kinematics of spirals in
distant galaxy clusters", ApJ 598, L87
48) Heidt, J., Tröller, M., Nilsson, K., et al. 2004,
"Evolution of BL Lacertae host galaxies", A&A 418, 813
49) Noll, S., Mehlert, D., Appenzeller, et al. 2004, "The FORS
Deep Field spectroscopic survey", A&A 418, 885
50) Böhm, A., Ziegler, B.L., Saglia, R.P., et al.
2004, "The Tully-Fisher relation at intermediate redshift", A&A
420, 97
51) Gabasch, A., Bender, R., Seitz, S., et al. 2004, "The
evolution of the luminosity functions in the FORS Deep Field from low to
high redshift: I. The blue bands", A&A 421, 41
52) Jäger, K., Ziegler, B.L., Böhm, A., et al. 2004,
"Internal kinematics of spiral galaxies in distant clusters. Part
II. Observations and data analysis", A&A 422, 907
53) Londish, D., Heidt, J., Boyle, B.J., Croom, S.M. 2004,
"2QZJ215454.3-305654: a radio-quiet BL Lac or lineless QSO?",
MNRAS 352, 903
54) Sbarufatti, B., Treves, A., Falomo, R., et al. 2005, "ESO-VLT
optical spectroscopy of BL Lac objects. I. New redshifts.",
AJ 129, 559
55) Gabasch, A., Hopp, U., Feulner, G., et al. 2006, "The
evolution of the luminosity functions in the FORS Deep Field from low
to high redshift: II. The red bands", A&A 448, 101
56) Ostorero, L., Wagner, S.J., Gracia, J., et al. 2006, "Testing
the inverse-Compton catastrophe scenario in the intra-day variable
source S5 0716+71", A&A 451, 797
57) Villata, N., Raiteri, C.M., Balonek, T.J., et al. 2006,
"The unprecedented optical outburst of the quasar 3C 454.3. The
WEBT campaign of 2004-2005", A&A 453, 817
58) Sbarufatti, B., Treves, A., Falomo, R., et al. 2006, "ESO-VLT
optical spectroscopy of BL Lac objects: II. New redshifts, featureless
objects and classification assessments.", AJ 132, 1
59) Tapken, C., Appenzeller, I., Gabasch, A., et al. 2006,
"Lyα emission galaxies at a redshift of z ~ 5.7 in the
FORS Deep Field", A&A 455, 145
60) Londish, D., Croom, S.C., Heidt, J., et al. 2007,
"The 2dF BL Lac survey II", MNRAS 374, 556
61) Raiteri, C., Villata, M., Capetti, A., et al. 2007,
"Spectroscopic monitoring of the BL Lac object AO 0235+164",
A&A 464, 871
62) Tapken, C., Appenzeller, I., Noll, S., et al. 2007,
"Lyα emission in high-redshift galaxies", A&A 467, 63
63) Villata, M., Raiteri, C.M., Larinov, V.M. et al. 2008,
"Multifrequency monitoring of the blazar 0716+714 during the
GASP-WEBT-AGILE campaign of 2007", A&A 481, L79
64) Valtonen, Lehto, H.J., M., Nilsson, K., et al.
2008, "A test of a massive binary black hole system and of Einsteins
General Relativity in the quasar OJ 287",
Nature 452, 851
65) Villforth, C., Heidt, J., Nilsson, K. 2008,
"Quasar host galaxies in the FORS Deep Field",
A&A 488, 133
66) Böttcher, M., Fultz, K., Aller, H.D., et al.
2009,
"The Whole Earth Blazar Telescope campaign on the intermediate BL Lac
object 3C 66A in 2007-2008",
ApJ 694, 174
67) Valtonen, M.J., Nilsson, K., Villforth, C., et al. 2009,
"Tidally induced outbursts in OJ 287 during the 2005-2008",
ApJ 698, 781
68) Villforth, C., Nilsson, K., Ostensen, R., et al. 2009,
"Intranight polarization variability in radio-loud and radio-quiet AGN",
MNRAS 397, 1893
69) Villata, M., Raiteri, C.M., Gurwell, M.A., et al. 2009,
"The GASP-WEBT monitoring of 3C 454.3 during the 2008 optical-to-radio
and gamma-ray outburst", A&A 504, L9
70) Raiteri, C.M., Villata, M., Capetti A., et al. 2009,
"WEBT multiwavelength monitoring and XMM-Newton observations of BL Lacertae
in 2007-2008. Unveiling different emission components.", A&A 507, 769
71) D'Ammando, F.D., Pucella, G., Raiteri, C.M., et al. 2009,
"AGILE detection of a rapid gamma-ray flare
from the blazar PKS 1510-089 during the GASP-WEBT monitoring"
A&A 508, 181
72) Acciari, V.A., Aliu, E., Aune, T., et al. 2009,
"Multiwavelength Observations of a TeV-Flare from W Comae",
ApJ 707, 612
73) Abdo, A.A., Ackermann, M., Ajello, M., et al. 2010,
"A change in the optical polarization associated with a gamma-ray flare in
the blazar 3C279",
Nature 463, 919
74) Vercellone, S., D'Ammando, F., Vittorini, S., et al. 2010,
"Multiwavelength Observations of 3C 454.3. III. Eighteen Months of
Agile Monitoring of the "Crazy Diamond" ", ApJ 712, 405
75) Villforth, C., Nilsson, K., Heidt, J., et al. 2010,
"Variability and stability of blazar jets on time scales of years: Optical
polarization monitoring of OJ 287 in 2005-2009", MNRAS 402, 2087
76) Abdo, A.A., Ackermann, M., Agudo, I., et al. 2010,
"The spectral energy distribution of Fermi bright blazars",
ApJ 716, 30
77) Abdo, A.A., Ackermann, M., Ajello, M., et al. 2011,
"Multi-wavelength observations of the flaring gamma-ray blazar 3C 66A
in 2008 October", ApJ 726, 43
78) Agudo, I., Jorstad, S.G., Marscher, A.P., et al. 2011,
"Location of gamma-ray flare emission in the jet of the BL Lacertae
Object OJ287 more than 14 pc from the central engine", ApJ 726, L13
79) Palma, N.I., Böttcher, M., de la Calle, I. et al. 2011,
"Multiwavelength observations of the gamma-ray Blazar PKS 0528+134
in quiescence", ApJ submitted
80) Heidt, J. & Nilsson, K. 2011,
"Polarimetry of optically selected BL Lac candidates from the SDSS",
A&A submitted
Invited reviews and lectures
1) Heidt, J. 1999, "Host galaxies and environment of
BL Lac objects", Invited review, in proc. ``BL Lac Phenomenon'',
ed. L.O. Takalo, A. Sillanpää, PASP Conf. Ser. 159, 367
2) Heidt, J., et al. 2001, "The FORS Deep Field",
Reviews in Modern Astronomy 14, 209
Conference Proceedings
1) Heidt, J., Wagner, S.J., Erkens, U. 1991, "Optical
monitoring of southern BL Lac objects", Astron. Ges.,
Abstr. Ser. 6, 105
2) Heidt, J., Wagner, S.J. 1991, "Spectral variability of the
BL Lac object S5 0716+714", Astron. Ges., Abstr. Ser. 6, 22
3) Wagner, S.J., Heidt, J., Witzel, A., Wegner, R.,
Quirrenbach, A. 1992, "Radio- and optical variability in
0716+714", Proc. "Physics of active galactic nuclei",
ed. W.D. Duschl, S.J. Wagner, Springer, p. 598
4) Treves, A., Fink, H.H., Malkan, M.A., et al. 1992,
"Multifrequency observations of KAZ 102 during the
ROSAT All Sky Survey", in "X-ray emission from AGN and the cosmic X-ray
background", workshop proceedings, ed. W. Brinkmann,
J. Trümper, 175
5) Döbereiner, S., Böhringer, H., Heidt, J. 1993,
"ROSAT PSPC observations of M86", Astron. Ges.,
Abstr. Ser. 8, 23
6) Heidt, J. 1993, "Variability in BL Lac objects",
in "Megaphot", workshop proceedings, ed. U. Borgeest, K.J. Schramm,
J. von Linde, 96
7) Kümmel, M., Wagner, S.J., Heidt, J. 1994, "Rapid variability
of the polarization of the BL Lac object S5 0716+714", Astron. Ges.,
Abstr. Ser. 10, 226
8) Blecha, A., Courvoisier, T.J.-L., Aller, H.D., et al.
1994, "Ground based observations of
PKS 2155-304 in November 1991",
in "Multi-wavelength continuum emission of AGN", proceedings IAU Symp. 159,
ed. T.J.-L. Courvoisier, A. Blecha, Kluwer Academic Publishers, 319
9) Schramm, K.J., Borgeest, U., von Linde, J., Heidt, J.,
Wagner, S.J. 1994, "The recent lightcurve of 3C 345",
in "Multi-wavelength continuum emission of AGN",
proceedings IAU Symp. 159, ed. T.J.-L. Courvoisier, A. Blecha
Kluwer Academic Publishers, 391
10) Heidt, J. 1994, "Optical microvariability in complete
samples of BL Lac objects", in "Multi-wavelength continuum emission
of AGN", proceedings IAU Symp. 159, ed. T.J.-L. Courvoisier, A. Blecha
Kluwer Academic Publishers, 393
11) Sillanpää, A., Takalo, L.O., Valtaoja, E., et al.
1994, "Coordinated
multifrequency observations of OJ 287 and MRK 421",
in "Multi-wavelength continuum emission of AGN", proceedings
IAU Symp. 159, ed. T.J.-L. Courvoisier, A. Blecha,
Kluwer Academic Publishers, 404
12) Heidt, J., Bock, H., Heines, A., Kümmel, M., Wagner, S.J.
1994, "Supplementary observations of OJ 287 and 3C 66A during
the OJ-94 campaign", in proc. ``Workshop on intensive monitoring
of OJ 287'', ed. M.R. Kidger, L.O. Takalo, Tuorla Observatory Reports
No. 174, 22
13) Pian, E., Edelson, R.A., Wagner, S.J., et al. 1995,
"Simultaneous UV, optical and radio monitoring of the BL Lac object OJ 287
in March 1993", Ad.Sp.R 16, 57
14) Sillanpää, A., Takalo, L.O., Pursimo, T.,
et al. 1996, "Light curves of OJ 287, 3C 66A, AO 0235+164
and S5 0716+714 observed during the OJ-94 project", in proc. ``Workshop
on two years of intensive monitoring of OJ 287 and 3C 66A'',
ed. L.O. Takalo, Tuorla Observatory Reports No. 176, 7
15) Heidt, J. 1996, "Near-IR and optical imaging of OJ 287",
in proc. ``Workshop on two years of intensive monitoring of OJ 287 and
3C 66A'', ed. L.O. Takalo, Tuorla Observatory Reports No. 176, 86
16) Döbereiner, S., Heidt, J., Wagner, S.J. 1996,
"Emission line regions in M86",
in ``New light on galaxy evolution'', proceedings IAU Symp. 171,
ed. R. Bender, R.L. Davies, Kluwer Academic Publishers, 364
17) Heidt, J., Pursimo, T., Sillanpää, A., Takalo, L.O.,
Nilsson, K. 1996, "High-resolution imaging of BL Lac host galaxies",
in ``New light on galaxy evolution'', proceedings IAU Symp. 171,
ed. R. Bender, R.L. Davies, Kluwer Academic Publishers, 389
18) von Linden, S., Heidt, J., Reuter, H.P., Wielebinski, R.
1996, "Simulation of mass transport in disk galaxies",
in ``New light on galaxy evolution'', proceedings IAU Symp. 171,
ed. R. Bender, R.L. Davies, Kluwer Academic Publishers, 405
19) Takalo, L.O., Sillanpää, A., Pursimo, T., et al.
1996, "Variability
characteristics of blazar OJ 287", in ``Extragalactic radio sources'',
proceedings IAU Symp. 175, ed. R. Ekers, C. Fanti, L. Padrielli,
Kluwer Academic Publishers, 45
20) Sillanpää, A., Takalo, L.O., Nilsson, K., et al.
1996,
"The environment of OJ 287: nearby galaxies and a long optical jet?",
in ``Extragalactic radio sources'', proceedings IAU Symp. 175,
ed. R. Ekers, C. Fanti, L. Padrielli, Kluwer Academic Publishers, 47
21) Heidt, J. 1996, "Intraday variability statistics in
radio-selected and x-ray selected BL Lac objects",
in ``Extragalactic radio sources'', proceedings IAU Symp. 175,
ed. R. Ekers, C. Fanti, L. Padrielli, Kluwer Academic Publishers, 246
22) Sillanpää, A., Takalo, L.O., Valtaoja, E., et al.
1996, "Simultaneous optical
and radio observations of the blazar OJ 287", Mem. Soc. Astron. Ital. 67, 539
23) Takalo, L.O., Sillanpää, A., Pursimo, T., et al.
1996, "Multifrequency
monitoring of blazars OJ 287 and 3C 66A", Mem. Soc. Astron. Ital. 67, 545
24) Kümmel M.W., Wagner S.J., Heidt J., et al.
1996, "Optical polarization
properties of gamma sources", in proceedings of Heidelberg workshop on
``Gamma-ray emitting AGN'', ed. J.G. Kirk, M. Camenzind, C. von Montigny,
S.J. Wagner, MPI H-V37-1996, 131
25) Heidt J. 1996, "Intraday variability statistics
of BL Lac objects in the optical domain", in procs.
``Blazar variability'', ed. H. R. Miller, J.R. Webb, J.C. Noble,
PASP Conf. Series No. 110, p. 64
26) Sillanpää, A., Takalo, L.O., Pursimo, T., et al.
1996, "Optical variations of OJ 287", in procs. ``Blazar variability'',
ed. H. R. Miller, J.R. Webb, J.C. Noble, PASP Conf. Series No. 110, 74
27) Castro-Tirado, A., Gorosabel, J., Masetti, N., et al.
1997, "The GRB 970111 errox box 19 hours
after the high-energy event", in proc. ``$4^ \rm th $ compton symposium'',
ed. C.D. Dermer, M.S. Strickman, J.D. Kurfess, AIP Conf. Proc. 410, 1516
28) Castro-Tirado, A.J., Gorosabel, J., Costa, E., et al.
1997, "Optical/IR
follow-up observations of GRBs detected by BeppoSAX", in proc. ``4th
Huntsville Gamma-Ray Burst Symposium, ed. C.A. Meegan, R.D. Preece,
T.M. Koshut, AIP Conf. Proc. 428, 489
29) Jäger, K., Fricke, K.J., Heidt J. 1997, "Observing the
the galaxy environment of QSOs",
in proc. IAC/ESO workshop ``Quasar hosts'', ed. D.L. Clements,
I. P\' e rez-Fournon, Springer, 90
30) Heidt J. 1997, "NIR-imaging of BL Lac host galaxies",
in proc. IAC/ESO workshop ``Quasar hosts'', ed.
D.L. Clements, I. P\' e rez-Fournon, Springer, 200
31) Fried J.W., Heidt J. 1997, "Host galaxies of
radio-loud AGN", in proc. IAC/ESO workshop ``Quasar hosts'',
ed. D.L. Clements, I. P\' e rez-Fournon, Springer, 215
32) Sillanpää, A., Takalo, L.O., Pursimo, T., et al.
1997, "Some examples of extremely close environments of
BL Lac objects",
in proc. IAC/ESO workshop ``Quasar hosts'', ed. D.L. Clements,
I. P\' e rez-Fournon, Springer, 223
33) Takalo, L.O., Nilsson, K., Pursimo, T., Sillanpää, A.,
Heidt, J.
1997, "The optical jet in 3C 371",
in proc. IAC/ESO workshop ``Quasar hosts'', D.L. Clements,
ed. I. P\' e rez-Fournon, Springer, 225
34) Heidt, J., Wagner, S.J., Sillanpää, A., et al.
1997,
"RXJ 1745+398: Detection of the first AGN acting as a gravitational lens",
Astron. Ges., Abstr. Ser. 13, 68
35) Jäger, K., Fricke, K.J., Heidt, J. 1997, "A deep
imaging survey around QSOs with intermediate redshift",
Astron. Ges., Abstr. Ser. 13, 69
36) Sillanpää, A., Takalo, L.O., Heinämäki, S, et al.
1998, "Light curves of OJ 287 and 3C 66A",
in proc. ``The OJ-94 Annual Meeting 1997'', ed. G. Tosti, L.O. Takalo, 5
37) Nilsson, K., Pursimo, T., Takalo, L.O., Sillanpää, A.,
Heidt, J. 1998, "Deep optical images of 3C 66A",
in proc. ``The OJ-94 Annual Meeting 1997'', ed. G. Tosti, L.O. Takalo, 43
38) Heidt, J. 1998, "Surrounding of OJ 287 on larger scales",
in proc. ``The OJ-94 Annual Meeting 1997'', ed. G. Tosti, L.O. Takalo, 49
39) Dietrich, M., Wagner, S.J., Bock, H., Heidt, J., Herter, M.,
Otterbein, K., Pfeiffer, M., Seitz, T. 1998, "The BL Lac outburst
in July 1997",
in proc. ``The OJ-94 Annual Meeting 1997'', ed. L.O. Takalo, G. Tosti, 204
40) Heidt, J. 1998, "High-resolution imaging of
EINSTEIN Slew Survey BL Lac objects", Astron. Ges.,
Abstr. Ser. 14, 62
41) Jäger, K., Fricke, K.J., Böhm, T., Heidt, J. 1998,
"On the environments of radio-quiet QSOs",
Astron. Ges., Abstr. Ser. 14, 63
42) Pursimo, T., Nilsson, K., Sillanpää, A., Takalo, L.O.,
Heidt, J. 1999, "Deep imaging of 1 Jy BL Lacs - Mg II absorbers",
in proc. ``BL Lac Phenomenon'',
ed. L.O. Takalo, A. Sillanpää, PASP Conf. Ser. 159, 385
43) Sillanpää, A., Takalo, L.O., Nilsson, K., et al.
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