2001A&A...371...79D


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.25CET10:03:58

2001A&A...371...79D - Astronomy and Astrophysics, volume 371, 79-92 (2001/5-3)

A spectroscopic and photometric study of short-timescale variability in NGC 5548.

DIETRICH M., BENDER C.F., BERGMANN D.J., BILLS T.E., BOCHKAREV N.G., BURENKOV A., GASKELL C.M., GUTZMER D.D., GROVE R., HILLER M.E., HUCHRA J.P., KLIMEK E.S., LUND C., MERKULOVA N., PEBLEY S., POULSEN M.A., PRONIK V.I., SERGEEV S.G., SERGEEVA E.A., SHAPOVALOVA A.I., VLASYUK V.V. and WILKES B.

Abstract (from CDS):

Result. of a ground-based optical monitoring campaign on NGC 5548 in June 1998 are presented. The broad-band fluxes (U, B, V), and the spectrophotometric optical continuum flux Fλ (5100Å) monotonically decreased in flux while the broad-band R and I fluxes and the integrated emission-line fluxes of Hα and Hβ remained constant to within 5%. On June 22, a short continuum flare was detected in the broad band fluxes. It had an amplitude of about ∼18% and it lasted only ≃90 min. The broad band fluxes and the optical continuum Fλ (5100Å) appear to vary simultaneously with the EUV variations. No reliable delay was detected for the broad optical emission lines in response to the EUVE variations. Narrow Hβ emission features predicted as a signature of an accretion disk were not detected during this campaign. However, there is marginal evidence for a faint feature at λ≃4962Å with FWHM≃6Å redshifted by Δv≃1100km/s with respect to Hβnarrow.

Abstract Copyright:

Journal keyword(s): galaxies: active - galaxies: Seyfert galaxies - galaxies: individual (NGC 5548)

VizieR on-line data: <Available at CDS (J/A+A/371/79): table1a.dat table2a.dat table3a.dat>

Simbad objects: 9

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Number of rows : 9

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 IC 450 Sy1 06 52 12.32333 +74 25 37.2376   15.16 14.19     ~ 506 1
2 NGC 3516 Sy1 11 06 47.4596406816 +72 34 07.189563769   13.12 12.40     ~ 1424 0
3 NGC 3783 Sy1 11 39 01.7095761008 -37 44 19.008597647   12.46 13.43 11.33 12.1 ~ 1492 0
4 NGC 4151 Sy1 12 10 32.5771747733 +39 24 21.057727323   12.18 11.48     ~ 3399 2
5 TYC 2010-1062-1 * 14 17 29.5924772494 +25 03 11.166327109   11.65 11.24 11.20   ~ 6 0
6 NGC 5548 Sy1 14 17 59.5401093128 +25 08 12.600227883   14.35 13.73     ~ 2414 0
7 MCG+08-31-041 Sy1 17 19 14.4925747 +48 58 49.426017   15.86 14.81 9.44   ~ 278 1
8 ICRF J184208.9+794617 Sy1 18 42 08.9910523393 +79 46 17.129210139   16.06 15.38     ~ 1218 0
9 NGC 7469 Sy1 23 03 15.674 +08 52 25.28 12.60 13.00 12.34     ~ 1903 3

    Equat.    Gal    SGal    Ecl

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2020.10.25-10:03:58

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