Multiwavelength observations of short-timescale variability in NGC 4151 .4. Analysis of multiwavelength continuum variability

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	Multiwavelength observations of short-timescale variability in NGC 4151 .4. Analysis of multiwavelength continuum variability
	Edelson, RA ; Alexander, T ; Crenshaw, DM ; Kaspi, S ; Malkan, MA ; Peterson, BM ; Warwick, RS ; Clavel, J ; Filippenko, AV ; Horne, K
刊名	ASTROPHYSICAL JOURNAL
	1996-10-10
卷号	470 期号:1 页码:364-377
关键词	Galaxies, Active Galaxies, Individual (Ngc 4151) Galaxies, Seyfert Ultraviolet, Galaxies X-rays, Galaxies
ISSN号	0004-637X
英文摘要	This paper combines data from the three preceding papers in order to analyze the multi-wave-band variability and spectral energy distribution of the Seyfert 1 galaxy NGC 4151 during the 1993 December monitoring campaign. The source, which was near its peak historical brightness, showed strong, correlated variability at X-ray, ultraviolet, and optical wavelengths. The strongest variations were seen in medium-energy (similar to 1.5 keV) X-rays, with a normalized variability amplitude (NVA) of 24%. Weaker (NVA = 6%) variations (uncorrelated with those at lower energies) were seen at soft gamma-ray energies of similar to 100 keV. No significant variability was seen in softer (0.1-1 keV) X-ray bands. In the ultraviolet/optical regime, the NVA decreased from 9% to 1% as the wavelength increased from 1275 to 6900 Angstrom These data do not probe extreme ultraviolet (1200 Angstrom to 0.1 keV) or hard X-ray (2-50 keV) variability. The phase differences between variations in different bands were consistent with zero lag, with upper limits of less than or similar to 0.15 day between 1275 Angstrom and the other ultraviolet bands, less than or similar to 0,3 day between 1275 Angstrom and 1.5 keV, and less than or similar to 1 day between 1275 and 5125 Angstrom These tight limits represent more than an order of magnitude improvement over those determined in previous multi-wave-band AGN monitoring campaigns. The ultraviolet fluctuation power spectra showed no evidence for periodicity, but were instead well fitted with a very steep, red power law (a less than or equal to -2.5).
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	UNIV CHICAGO PRESS
WOS记录号	WOS:A1996VL72300028
内容类型	期刊论文
源URL	[http://119.78.226.72/handle/331011/32419]
专题	中国科学院上海天文台
通讯作者	Edelson, RA
作者单位	1.TECHNION ISRAEL INST TECHNOL,DEPT PHYS,IL-32000 HAIFA,ISRAEL 2.TEL AVIV UNIV,SACKLER FAC EXACT SCI,SCH PHYS & ASTRON,IL-69978 TEL AVIV,ISRAEL 3.TEL AVIV UNIV,SACKLER FAC EXACT SCI,WISE OBSERV,IL-69978 TEL AVIV,ISRAEL 4.NASA,GODDARD SPACE FLIGHT CTR,ASTRON PROGRAM,COMP SCI CORP,GREENBELT,MD 20771 5.MT ROYAL COLL,DEPT ENGN MATH & PHYS,CALGARY,AB T3E 6K6,CANADA 6.UNIV CALIF LOS ANGELES,DEPT ASTRON,LOS ANGELES,CA 90024 7.OHIO STATE UNIV,DEPT ASTRON,COLUMBUS,OH 43210 8.UNIV LEICESTER,DEPT ASTRON,LEICESTER LE1 7RH,LEICS,ENGLAND 9.EUROPEAN SPACE AGCY,ISO PROJECT,MADRID 28080,SPAIN 10.UNIV ST ANDREWS,SCH PHYS & ASTRON,ST ANDREWS KY16 9SS,FIFE,SCOTLAND
推荐引用方式 GB/T 7714	Edelson, RA,Alexander, T,Crenshaw, DM,et al. Multiwavelength observations of short-timescale variability in NGC 4151 .4. Analysis of multiwavelength continuum variability[J]. ASTROPHYSICAL JOURNAL,1996,470(1):364-377.
APA	Edelson, RA.,Alexander, T.,Crenshaw, DM.,Kaspi, S.,Malkan, MA.,...&Zou, ZL.(1996).Multiwavelength observations of short-timescale variability in NGC 4151 .4. Analysis of multiwavelength continuum variability.ASTROPHYSICAL JOURNAL,470(1),364-377.
MLA	Edelson, RA,et al."Multiwavelength observations of short-timescale variability in NGC 4151 .4. Analysis of multiwavelength continuum variability".ASTROPHYSICAL JOURNAL 470.1(1996):364-377.