[vsnet-campaign 61] NGC 4151 ASCA-VSNET multiwavelength campaign

[ueda@astro.isas.ac.jp]

NGC 4151 ASCA-VSNET multiwavelength campaign
				Hajime Inoue
				Yoshihiro Ueda
				Institute of Space and Astronautical Science
				on behalf of the VSNET team 
		
The ASCA satellite is observing the Seyfert galaxy NGC 4151 from May
12 12:00 to May 24 24:00 (UT) in the 0.5--10 keV band. This is the
first opportunity to make such a long, continoues observation of this
source with ASCA and simulataneous observations in other wavelengths
are strongly encouraged. Optical spectroscopic observation is most
important, although photometoric observation is also useful. High
monitoring frequencey is not necessary and one data point per day is
still appreciated. The main purpose of the ASCA observation is
summarized in the abstract attached below. Combining opticical and
X-ray data, we would like to investigate change and correlation of the
characterstics of the nuclei seen in different bands. For details of
optical observations (recommended standards etc), please refer another
article that will be posted by T.Kato or K.Ayani.


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A LONG OBSERVATION OF NGC4151 WITH ASCA

ABSTRACT

A broad and skewed line feature from Seyfert galaxies has been
interpreted to origineate from the innermost region of an accretion
disk. These features are detected not only from Seyfert 1 but also
Seyfert 2 galaxies. However, the inclination angles obtained from
"disk-line" fits to their spectra are always around 30 Deg, which is
inconsistent with a unified scheme of Seyfert 1 and 2 galaxies. One
interpretation could be an addition of a 6.4 keV line from a far
outside to the disk-line from the inside but if so, time scales of the
intensity variation of the two line components should be much
different from each other. To investigate such a line profile time
variation of Seyfert 2 like AGNs, we propose a long observation of one
of the brightest Seyfert 2-like galaxy, NGC4151.

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