ACT DR6 web atlas

This is a pannable, zoomable web atlas for Atacama Cosmology Telescope (ACT)'s 6th data release (DR6). The initial view is a multifrequency view of an ACT DR6+Planck coadd, where the red, green and blue color channels correspond to ACT's f090, f150 and f220 bands respectively. Here the CMB looks like a gray fog, synchrotron sources look like red dots, dust looks light blue and tSZ dark blue.

Usage

Pan and scroll using the mouse, like on google maps. Use the keyboard to change what is shown.

• Press f/r to switch between f090, f150, f220, ftot, f030 and f040.
• Press c/v to cycle through T, Q, U, E, B, F.
• Press j/k to act+planck (microwave), WISE (infrared), Legacysurvey (optical) and NVSS (radio)
• Press n/m to switch between ACT+Planck and Planck.
• Press z/x/ to cycle through single-freq, 3-freq, 2-freq, and 2-freq difference
• Press g to switch between color and gray-scale when in single-frequency mode. Gray-scale is better for looking at low-S/N features, like point sources and clusters in the F map, or polarization.
• Press u/i to increase/decrease the color scale in steps of 10%.
• Press o/p to shift the color scale center.
• Press q to toggle the coordinate grid.
• Press a to toggle the mouseover coordinates from decimal degrees to sexagesimal hour angles.
• Press l to update the address bar with a link to the current view, so you can bookmark it or send it to others

On computers without a keyboard, such as a mobile phone or tablet, you can press the hamburger icon in the top right, which gives you a virtual keyboard with the buttons above. This is clunky, but works in a pinch.

Object lookup

You can do an object lookup by shift-cliking on a spot in the map, using NED. This can take a few seconds.

Browser compatibility

The ACT data is served as raw bytes encodes as PNG tiles, which is then decoded and turned into real images on the fly in the browser. This is why it's possible to change the color scale interactively. This works in Firefox and Chrome-like browsers, but not in Safari. In safari the ACT map will look like random blotches of color!