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Re: [APML] OT: Infrared M13
Wei-Hao, that is very cool! Sounds like a lot of work but it is certainly
worth it. Thanks so much for sharing this.
No apologies for the OT post - I do not subscribe to any lists for
professional astronomers shooting in IR so would not get to see this
otherwise! Is this camera from the CFHT?
Stuart
----- Original Message -----
From: "Wei-Hao Wang" <astrophoto@gmail.com>
To: "APML" <astro-photo@seds.org>
Sent: Sunday, July 03, 2005 6:07 AM
Subject: [APML] OT: Infrared M13
Hi,
Sorry for this OT. It's not a film image. I know there is a CCD list
but this is not
a CCD image. I know there is a DSLR list but this is not a DSLR image
either.
This is M13 taken by a CMOS-like, 16 mega pixel mosaic camera. This camera
is still the largest near-IR camera in the world. I took images using
1.6 um and
1.2 um broadband filters but I only managed to process the 1.6 um data. So
I only have a B/W image. Telescope is our 2.2m telescope. Exposure time is
26
minutes at the center of the image and 8.7 minutes at the corners. Seeing
was
about 0.7 arcsec. No deconvolution. Here are the 1.6 um B/W images:
small version
http://www.ifa.hawaii.edu/~wang/misc/M13_ULB_H-small.jpg
larger version (1.1MB)
http://www.ifa.hawaii.edu/~wang/misc/M13_ULB_H.jpg
Well, some people may feel B/W images are a little boring. To colorize the
image, I downloaded 2MASS 1.2, 1.6, and 2.1 um images and made an LRGB
color image. L is my own 1.6um image, RGB are 2MASS 1.2, 2.1, and 1.6 um
data respectively. This is not an easy task because stars are almost
colorless
in near-IR. I have to swap the order of 1.6 and 2.1 um images to make
the stars
have a little color. Otherwise all stars will look stupidly green.
In addition,
2MASS's resolution and depth are both much lower than my image. This is why
there are color halos around bright stars and the faintest stars
remain colorless.
Anyway, here are the color images:
small version
http://www.ifa.hawaii.edu/~wang/misc/M13_ULB_2MASS-small.jpg
larger version (1.3MB)
http://www.ifa.hawaii.edu/~wang/misc/M13_ULB_2MASS.jpg
Enjoy.
Wei-Hao
______________________________________________________________________
Wei-Hao Wang :)
Institute for Astronomy at University of Hawaii
Address:
2680 Woodlawn Drive Personal Website:
Honolulu, HI 96822 http://www.ifa.hawaii.edu/~wang
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