WildGuruLarry wrote:TheLeRoque wrote:It would be very informative to post side-by-side images of this scene - one taken at visible wavelengths and the other at IR wavelengths - to visually demonstrate the ability of IR images to penetrate cosmic dust.
You can look at this APOD:
http://apod.nasa.gov/apod/ap061003.html
I loaded the two pictures up in two tabs and flipped between them. The two galaxies are just barely visible on the left side of the visible wavelength image. Very cool.
-Mike
I rotated and rescaled the above visible-wavelength image to match the WISE IR image; see it
here. Below is a small HTML file which fades the visible image in and out as you move your mouse left and right across it.
Code: Select all
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en"><head>
<title>Heart Nebula, visible and IR</title>
<script type="text/javascript">
function s(ev,x) {
var i = document.getElementById("vis")
var t = x / i.width
t = 1 - t*t
i.style.opacity = t
i.style.filter = "alpha(opacity=" + 100*t + ")"
}
</script>
</head>
<body style="padding:0;margin:0;">
<h2 style="text-align:center">Heart Nebula (IC 1805), in IR (base) and visible (overlay)</h2>
<div style="margin:5px">Image credits:
<a href="http://apod.nasa.gov/apod/ap061003.html">Visible image</a>:
Matt Russell (rotated and rescaled);
<a href="http://antwrp.gsfc.nasa.gov/apod/ap100309.html">IR image</a>:
WISE team.
</div>
<img src="http://antwrp.gsfc.nasa.gov/apod/image/1003/heartmaffei_wise_big.jpg" id="IR"
style="position:absolute; width:100%; z-index:1;" />
<img src="http://img198.imageshack.us/img198/3379/heartvisible.png" id="vis"
onmousemove="s(event,event.clientX)" onmouseout="s(event,0)"
style="position:absolute; width:100%; z-index:2;" />
</body></html>
(Works best in non-IE browsers; IE doesn't handle PNG transparency the same way other browsers do.)
[quote="WildGuruLarry"][quote="TheLeRoque"]It would be very informative to post side-by-side images of this scene - one taken at visible wavelengths and the other at IR wavelengths - to visually demonstrate the ability of IR images to penetrate cosmic dust.[/quote]
You can look at this APOD:
http://apod.nasa.gov/apod/ap061003.html
I loaded the two pictures up in two tabs and flipped between them. The two galaxies are just barely visible on the left side of the visible wavelength image. Very cool.
-Mike[/quote]I rotated and rescaled the above visible-wavelength image to match the WISE IR image; see it [url=http://img198.imageshack.us/img198/3379/heartvisible.png]here[/url]. Below is a small HTML file which fades the visible image in and out as you move your mouse left and right across it. [code]<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en"><head>
<title>Heart Nebula, visible and IR</title>
<script type="text/javascript">
function s(ev,x) {
var i = document.getElementById("vis")
var t = x / i.width
t = 1 - t*t
i.style.opacity = t
i.style.filter = "alpha(opacity=" + 100*t + ")"
}
</script>
</head>
<body style="padding:0;margin:0;">
<h2 style="text-align:center">Heart Nebula (IC 1805), in IR (base) and visible (overlay)</h2>
<div style="margin:5px">Image credits:
<a href="http://apod.nasa.gov/apod/ap061003.html">Visible image</a>:
Matt Russell (rotated and rescaled);
<a href="http://antwrp.gsfc.nasa.gov/apod/ap100309.html">IR image</a>:
WISE team.
</div>
<img src="http://antwrp.gsfc.nasa.gov/apod/image/1003/heartmaffei_wise_big.jpg" id="IR"
style="position:absolute; width:100%; z-index:1;" />
<img src="http://img198.imageshack.us/img198/3379/heartvisible.png" id="vis"
onmousemove="s(event,event.clientX)" onmouseout="s(event,0)"
style="position:absolute; width:100%; z-index:2;" />
</body></html>[/code](Works best in non-IE browsers; IE doesn't handle PNG transparency the same way other browsers do.)