J/A+A/376/775 UBVRI and H-beta observations of 3C 390.3 (Shapovalova+ 2001)
Intermediate resolution H-beta spectroscopy and photometric monitoring
of 3C 390.3. I. Further evidence of a nuclear accretion disk.
Shapovalova A.I., Burenkov A.N., Carrasco L., Chavushyan V.H.,
Doroshenko V.T., Dumont A.M., Lyuty V.M., Valdes J.R., Vlasuyk V.V.,
Bochkarev N.G., Collin S., Legrand F., Mikhailov V.P., Spiridonova O.I.,
Kurtanidze O., Nikolashvili M.G.
<Astron. Astrophys. 376, 775 (2001)>
=2001A&A...376..775S 2001A&A...376..775S
ADC_Keywords: Active gal. nuclei ; Photometry, UBVRI ; Photometry, Cousins
Keywords: galaxies: active - galaxies: Seyfert -
galaxies: individual (3C 390.3) - line: profiles
Abstract:
We have monitored the AGN 3C 390.3 between 1995 and 2000. A historical
B-band light curve dating back to 1966 shows a large increase in
brightness during 1970-1971, followed by a gradual decrease down to a
minimum in 1982. During the 1995-2000 lapse the broad Hβ emission
and the continuum flux varied by a factor of ∼3. Two large amplitude
outbursts, of different duration, in continuum and light were observed
i.e.: in October 1994 a brighter flare that lasted ∼1000 days and in
July 1997 another one that lasted ∼700 days were detected. The
response time lag of the emission lines relative to flux changes of
the continuum has been found to vary with time i.e. during 1995-1997 a
lag of about 100 days is evident, while during 1998-1999 a double
valued lag of ∼100 days and ∼35 days is present in our data. The flux
in the Hβ wings and line core vary simultaneously, a behavior
indicative of predominantly circular motions in the broad line region.
Important changes of the Hβ emission profiles were detected: at
times, we found profiles with prominent asymmetric wings, like those
normaly seen in Sy1s, while at other times, we observe profiles with
weak, almost symmetrical wings, similar to those of Sy1.8s.
Objects:
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RA (2000) DE Designation(s)
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18 42 09.0 +79 46 17 3C 390.3 = QSO 1845+796
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 74 105 Photometric results
table4.dat 62 46 Log of the spectroscopic observations
table5.dat 38 46 Observed Hβ and continuum fluxes
tables.tex 105 205 LaTeX version of tables 2 and 4
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 10 A10 "YYYY/MM/DD" Date UT Date
12- 22 F11.3 d JD Julian date
24- 28 F5.2 mag Bmag ? B magnitude
30- 33 F4.2 mag e_Bmag ? rms uncertainty on Bmag
35- 40 F6.3 mag Vmag ? V magnitude
42- 46 F5.3 mag e_Vmag ? rms uncertainty on Vmag
48- 52 F5.2 mag Rcmag ? Cousins R magnitude
54- 57 F4.2 mag e_Rcmag ? rms uncertainty on Rcmag
59- 63 F5.2 mag Icmag ? Cousins I magnitude
65- 68 F4.2 mag e_Icmag ? rms uncertainty on Icmag
70- 74 A5 --- Obs Observatory (1)
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Note (1): Observatory where the data was obtained:
SAO: Spetial Astrofisical Observatory
SAI: Crimean Laboratory
Abast: Abastumani Astrophysical Observatory in Georgia
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 10 A10 "YYYY/MM/DD" Date UT Date
12- 22 F11.3 d JD Julian date
24- 25 A2 --- Instr Instrumentation code (G1)
27- 29 F3.1 arcsec Aper1 Aperture (slit width)
30 A1 --- --- [x]
31- 34 F4.1 arcsec Aper2 Aperture (slit length)
36- 39 I4 0.1nm Range1 Lower value of the spectral range
40 A1 --- --- [-]
41- 44 I4 0.1nm Range2 Upper value of the spectral range
46- 49 F4.1 0.1nm Resol Spectral Resolution
51- 53 F3.1 arcsec Seeing ? Seeing
54 A1 --- --- [-]
55 I1 arcsec Seeing2 ? Upper value of Seeing when interval
56 A1 --- u_Seeing2 [?] Uncertainty flag on Seeing and Seeing2
58- 61 F4.1 --- S/N Signal-to-noise ratio (2)
62 A1 --- n_S/N [a] a: Estimated S/N ratio in the
line-free continuum (5330-5370Å)
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Note (2): S/N is computed in a region of the continuum (537-542nm)
where there are no prominent emission or absorption lines.
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 11 F11.3 d JD Julian date
13- 14 A2 --- Instr Instrumentation code (G1)
16- 20 F5.3 10-16W/m2 FHbeta Total flux in Hβ (1)
22- 26 F5.3 10-16W/m2 e_FHbeta rms uncertainty on FHbeta (1)
28- 32 F5.3 10-17W/m2/nm Fc Continuum flux at 5125Å, reduced to
the 6m telescope aperture(2"x6") (2)
34- 38 F5.3 10-17W/m2/nm e_Fc Estimated continuum flux error (2)
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Note (1): In units of 10-13erg/s/cm2
Note (2): In units of 10-15erg/s/cm2/Å
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Global Notes:
Note (G1): The codes are:
G = 6m SAO, Prime focus UAGS 530x580 pixels
P = 6m SAO, Prime focus UAGS 1024x1024 pixels
T = 6m SAO, Prime focus Multi-Pupil Field Spectrograph 530x580 pixels
N = 6m SAO, Nasmyth focus Long slit 1024x1024 pixels
Z1 = 1m Zeiss, Cassegrain UAGS 530x580 pixels
Z2 = 1m Zeiss, Cassegrain UAGS 1040x1170 pixels
M = 2.1m GHO, Cassegrain Boller&Chivens 1024x1024 pixels
Acknowledgements: Luis Carrasco
(End) Patricia Bauer [CDS] 15-Aug-2001