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

被引：10

作者：

Dietrich, M ^{[1
]}

Bender, CF

Bergmann, DJ

Bills, TE

Bochkarev, NG

Burenkov, A

Gaskell, CM

Gutzmer, DD

Grove, R

Hiller, ME

Huchra, JP

Klimek, ES

Lund, C

Merkulova, N

Pebley, S

Poulsen, MA

Pronik, VI

Sergeev, SG

Sergeeva, EA

Shapovalova, AI

Vlasyuk, VV

Wilkes, B

机构：

[1] Univ Florida, Dept Astron, Bryant Space Sci Ctr 211, Gainesville, FL 32611 USA

[2] Landessternwarte Heidelberg, D-69117 Heidelberg, Germany

[3] Univ Nebraska, Dept Phys & Astron, Lincoln, NE 68588 USA

[4] Moscow MV Lomonosov State Univ, Sternberg Astron Inst, Moscow 119899, Russia

[5] Russian Acad Sci, Special Astrophys Observ, Nyzknij Arkhyz 369167, Karachaj Cherke, Russia

[6] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA

[7] Crimean Astrophys Observ, UA-98409 Crimea, Ukraine

[8] Isaac Newton Inst Chile, Crimean Branch, Santiago, Chile

来源：

ASTRONOMY & ASTROPHYSICS | 2001年 / 371卷 / 01期

关键词：

galaxies : active; galaxies : Seyfert galaxies galaxies : individual (NGC 5548);

D O I：

10.1051/0004-6361:20010330

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Results 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 F lambda (5100 Angstrom) monotonically decreased in flux while the broad-band R and I fluxes and the integrated emission-line fluxes of H alpha and H beta remained constant to within 5%. On June 22, a short continuum are was detected in the broad band fluxes. It had an amplitude of about similar to 18% and it lasted only approximate to 90 min. The broad band fluxes and the optical continuum F lambda (5100 Angstrom) 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 H beta 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 lambda similar or equal to 4962 Angstrom with FWHM similar or equal to 6 Angstrom redshifted by Delta upsilon similar or equal to 1100 km s(-1) with respect to H beta (narrow).

引用

页码：79 / 92

页数：14

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