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Xrray Versus Optical Variations in the Seyfert 1 Nucleus Ngc 3516: A Puzzling Disconnectedness by Dan Maoz, Nasa Technical Reports Server (Ntrs), Et Al - Paperback
58.80 AED

Xrray Versus Optical Variations in the Seyfert 1 Nucleus Ngc 3516: A Puzzling Disconnectedness by Dan Maoz, Nasa Technical Reports Server (Ntrs), Et Al - Paperback

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Category Type
Politics
ISBN
9781287293538
Author
Dan Maoz, Nasa Technical Reports Server (Ntrs), Et Al
Publisher
Bibliogov
Description:

We present optical broadband (B and R) observations of the Seyfert 1 nucleus NGC 3516, obtained at Wise Observatory from March 1997 to March 2002, contemporaneously with X-ray 2-10 keV measurements with RXTE. With these data we increase the temporal baseline of this dataset to 5 years, more than triple to the coverage we have previously presented for this object. Analysis of the new data ...

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    Category Type
    Politics
    ISBN
    9781287293538
    Item EAN
    2724352929564
    People
    Author
    Dan Maoz, Nasa Technical Reports Server (Ntrs), Et Al
    People
    Publisher
    Bibliogov
    Category Type
    Politics
    ISBN
    9781287293538
    Item EAN
    2724352929564
    People
    Author
    Dan Maoz, Nasa Technical Reports Server (Ntrs), Et Al
    People
    Publisher
    Bibliogov
    Technical Information
    Binding
    Paperback
    Languages and countries
    Book Language
    English
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  •  

    Description:

    We present optical broadband (B and R) observations of the Seyfert 1 nucleus NGC 3516, obtained at Wise Observatory from March 1997 to March 2002, contemporaneously with X-ray 2-10 keV measurements with RXTE. With these data we increase the temporal baseline of this dataset to 5 years, more than

    We present optical broadband (B and R) observations of the Seyfert 1 nucleus NGC 3516, obtained at Wise Observatory from March 1997 to March 2002, contemporaneously with X-ray 2-10 keV measurements with RXTE. With these data we increase the temporal baseline of this dataset to 5 years, more than triple to the coverage we have previously presented for this object. Analysis of the new data does not confirm the 100-day lag of X-ray behind optical variations, tentatively reported in our previous work. Indeed, excluding the first year's data, which drive the previous result, there is no significant correlation at any Lag between the X-ray and optical bands. We also find no correlation at any lag between optical flux and various X-ray hardness ratios. We conclude that the close relation observed between the bands during the first year of our program was either a fluke, or perhaps the result of the exceptionally bright state of NGC 3516 in 1997, to which it has yet to return. Reviewing the results of published joint X-ray and UV/optical Seyfert monitoring programs, we speculate that there are at least two components or mechanisms contributing to the X-ray continuum emission up to 10 key: a soft component that is correlated with UV/optical variations on timescales approx. greater than 1 day, and whose presence can be detected when the source is observed at low enough energies (approx. 1 keV), is unabsorbed, or is in a sufficiently bright phase; and a hard component whose variations are uncorrelated with the UV/optical.

    Product Features:
    • Category: Politics
    • Binding: Paperback
    • Language of Text: English
    • Author(s): Dan Maoz, Nasa Technical Reports Server (Ntrs), Et Al
    • Publisher: Bibliogov
    • ISBN: 9781287293538
    • Number of Pages: 24
    • Dimensions: 9.69 x 7.44 x 0.05 inches
 

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