Observations And Modeling of the Gas Dynamics of the Barred Spiral Galaxy Ngc 3359
Observations And Modeling of the Gas Dynamics of the Barred Spiral Galaxy Ngc 3359
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In our eReader you can find the full English version of the book. Read Observations And Modeling of the Gas Dynamics of the Barred Spiral Galaxy Ngc 3359 Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book Observations And Modeling of the Gas Dynamics of the Barred Spiral Galaxy Ngc 3359
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First, the single channel maps of NGC 3359 were split into four quadrants, to reduce the number of integrations necessary in each step.
Each quadrant was then integrated using the window method, with the signal-to-noise criteria mentioned above. The spectra were also Manning smoothed in frequency, to improve further the signal-to-noise properties of the integrated maps. For comparison, the same integrations were com- puted by the cutoff technique. The cutoff adopted was twice the rms single cha...nnel noise, and the same "three sigma" requirement on the inte- gral was enforced as in the window method. The density and velocity maps generated by the former technique were subtracted from those produced by the latter, to give density and velocity difference maps in the four quadrants. These maps were among the primary tools used to find regions of the galaxy where errors were likely. Another very useful tool was to plot the point-by-point velocities, determined by the velocity-window program, after subtracting at each point the mean rotational velocity (properly deprojected) of the annulus in which it lies.
What to read after Observations And Modeling of the Gas Dynamics of the Barred Spiral Galaxy Ngc 3359?
You can find similar books in the "Read Also" column, or choose other free books by Ball, John Roger, 1956- to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
First, the single channel maps of NGC 3359 were split into four quadrants, to reduce the number of integrations necessary in each step.
Each quadrant was then integrated using the window method, with the signal-to-noise criteria mentioned above. The spectra were also Manning smoothed in frequency, to improve further the signal-to-noise properties of the integrated maps. For comparison, the same integrations were com- puted by the cutoff technique. The cutoff adopted was twice the rms single cha...nnel noise, and the same "three sigma" requirement on the inte- gral was enforced as in the window method. The density and velocity maps generated by the former technique were subtracted from those produced by the latter, to give density and velocity difference maps in the four quadrants. These maps were among the primary tools used to find regions of the galaxy where errors were likely. Another very useful tool was to plot the point-by-point velocities, determined by the velocity-window program, after subtracting at each point the mean rotational velocity (properly deprojected) of the annulus in which it lies.
What to read after Observations And Modeling of the Gas Dynamics of the Barred Spiral Galaxy Ngc 3359?
You can find similar books in the "Read Also" column, or choose other free books by Ball, John Roger, 1956- to read onlineMoreLess
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