BVRI CCD-Photometry of Comparison Stars in the Neighborhoods of Galaxies with Active Nuclei. I

Doroshenko, V. T.; Сергеев, С. Г.; Меркулова, Н. И.; Сергеева, Е. А.; Golubinsky, Yu. V.; Pronik, V. I.; Okhmat, N. N.

doi:10.1007/s10511-005-0016-5

Cited by 26 publications

(45 citation statements)

References 10 publications

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“…Details of the observing and reduction procedure are as described by Klimek et al (2004). Comparison star magnitudes were calibrated following Doroshenko et al (2005aDoroshenko et al ( , 2005b and Chonis & Gaskell (2008). To minimize the effects of variations in the image quality, fluxes were measured through an aperture of radius 8.…”

Section: Photometrymentioning

confidence: 99%

Reverberation Mapping Measurements of Black Hole Masses in Six Local Seyfert Galaxies

Denney

Peterson

Pogge

et al. 2010

ApJ

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We present the final results from a high sampling rate, multi-month, spectrophotometric reverberation mapping campaign undertaken to obtain either new or improved Hβ reverberation lag measurements for several relatively low-luminosity active galactic nuclei (AGNs). We have reliably measured the time delay between variations in the continuum and Hβ emission line in six local Seyfert 1 galaxies. These measurements are used to calculate the mass of the supermassive black hole at the center of each of these AGNs. We place our results in context to the most current calibration of the broad-line region (BLR) R BLR -L relationship, where our results remove outliers and reduce the scatter at the low-luminosity end of this relationship. We also present velocity-resolved Hβ time-delay measurements for our complete sample, though the clearest velocity-resolved kinematic signatures have already been published.

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Section: Photometrymentioning

confidence: 99%

Reverberation Mapping Measurements of Black Hole Masses in Six Local Seyfert Galaxies

Denney

Peterson

Pogge

et al. 2010

ApJ

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321

345

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“…Coordinates and stellar magnitudes of the comparison stars are given in Table 2. Designations of the comparison stars in column (2) of Table 2 are the same as in Doroshenko et al (2005). Table 3 shows variability characteristics of these nuclei for the B filter.…”

Section: Observations and Data Processingmentioning

confidence: 99%

“…Typical uncertainty is about 0.7%. More details about observations, processing, and photometric uncertainties are given by Doroshenko et al (2005).…”

Section: Observations and Data Processingmentioning

confidence: 99%

Lag‐Luminosity Relationship for Interband Lags between Variations inB,V,R, andIBands in Active Galactic Nuclei

Сергеев

Doroshenko

Golubinskiy

et al. 2005

ApJ

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We determine interband lags between variations in the B band and variations in the V, R, and I bands for 14 active galactic nuclei observed at the Crimean Astrophysical Observatory. The computed lags range from tenths of a day to several days, and it is positive (that is, V, R, and I bands lag behind the B band) in most cases, except for a few cases for the V filter. In some cases, the lag is greater than zero, with more than 3 confidence. The lag is systematically less for the V filter than for the red filters, and the lag determined from the cross-correlation function (CCF) centroid is systematically greater than the lag determined from the CCF peak. We find that the lag scales with luminosity as L b , where b % 0:4-0.5. We attribute this lag to the light time travel effect, so it reflects the geometrical size of the region that emits optical continuum. We consider a model in which optical emission is mainly reprocessed emission that arises in the accretion disk heated by an X-ray source above the disk.

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“…5 for comments). Doroshenko et al 2005aDoroshenko et al , 2005b were aligned using ALIGN/IMAGE and REBIN/ROTATE commands and then averaged.…”

Section: Observations and Data Reductionmentioning

confidence: 99%

“…Johnson-Cousins comparison sequences in the fields of Seyfert galaxies were presented in the papers of Penston, Penston & Sandage (1971), Miller (1981Miller ( , 1986, Hamuy & Maza (1989), Curry et al (1998), Bachev, Strigachev & Dimitrov (2000), González-Pérez, Kidger & Martín-Luis (2001), and Doroshenko et al (2005aDoroshenko et al ( , 2005b. Further improvement of the existing standard sequences along with establishing new ones is highly recommended.…”

Section: Introductionmentioning

confidence: 99%

Johnson‐Cousins magnitudes of comparison stars in the fields of ten Seyfert galaxies

Mihov

Slavcheva-Mihova

2008

Astron Nachr

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We present UBVRCIC magnitudes of 49 comparison stars in the fields of the Seyfert galaxies Mrk 335, Mrk 79, Mrk 279, Mrk 506, 3C 382, 3C 390.3, NGC 6814, Mrk 304, Ark 564, and NGC 7469 in order to facilitate the photometric monitoring of these objects; 36 of the stars have not been calibrated before. The comparison stars are situated in 5 × 5 arcmin fields centred on the Seyfert galaxies, their V band flux ranges from 11.7 to 18.2 mag with a median value of 16.3 mag, and their B − V colour index ranges from 0.4 to 1.6 mag with a median value of 0.8 mag. The median errors of the calibrated UBVRCIC magnitudes are 0.08, 0.04, 0.03, 0.04, and 0.06 mag, respectively. Comparison stars were calibrated for the first time in three of the fields (Mrk 506, 3C 382, and Mrk 304). The comparison sequences in the other fields were improved in various aspects. Extra stars were calibrated in four fields (Mrk 335, Mrk 79, NGC 6814, and NGC 7469) -most of these stars are fainter and are situated closer to the Seyfert galaxies compared to the existing comparison stars. The passband coverage of the sequences in five fields (Mrk 335, Mrk 79, Mrk 279, NGC 6814, and Ark 564) was complemented with the U band.

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BVRI CCD-Photometry of Comparison Stars in the Neighborhoods of Galaxies with Active Nuclei. I

Cited by 26 publications

References 10 publications

Reverberation Mapping Measurements of Black Hole Masses in Six Local Seyfert Galaxies

Reverberation Mapping Measurements of Black Hole Masses in Six Local Seyfert Galaxies

Lag‐Luminosity Relationship for Interband Lags between Variations inB,V,R, andIBands in Active Galactic Nuclei

Johnson‐Cousins magnitudes of comparison stars in the fields of ten Seyfert galaxies

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