Date: Fri, 13 Jul 2007 11:00:39 -1000
Hi Yannick,
I checked a couple of typos, and added a bit of formating which
I would include as is on the CFHTLS news section. Yannick, how
about giving an estimation of gain in accuracy for the new
astrometry using 2MASS? I understand it varies from field to
field but on average I remember you gave some figures at the UM.
JJ, is it all fine as is? If so, I then suggest Yannick sends
it this time to the "cfhtls" alias. I guess you could attach
a small 1024x768 "screensaver" size chunck of one of the amazing
JPEG from the Deep 85% as a visual addition? Here, I cropped one
for you, attached to this email, it is only 1% of one Deep field,
wao... truly amazing!
Jean-Charles.
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Dear CFHTLS registered users
The Synoptic T0004 Table is now completed and opened to the public
without restriction. This table provides useful information about the
release and all quality assessment meta-data built during the production
of the release.
The T0004 release has important new features as compared to T0003:
- 2 sets of Deep data :
o 25% best seeing images stack (D25: ugriz with seeing down to 0.60" for
some fields with exp. time up to 15hrs)
o 85% best seeing images stack : the deepest wide field ever produced
with a 4-meter telescope (D85: up to 50 hrs in some fields)
- New Wide field: addition of the W4 wide field with 11 deg2 complete
in ugriz.
- New astrometry: done with 2MASS instead of USNO. It provides more
accurate and more stable astrometric calibration than T0003 for ALL
fields (a gain in rms internal and external error position by a factor
of 2). It also provides a more stable an accurate field-to-field
photometric calibration.
- Number of stacks:
o Deep: 40 [20 D25 (4*ugriz) + 20 D85 (4*ugriz)]
o Wide: 524 (35 u + 133 g + 173 r + 137 i + 46 z)
More information is available through the T0004 summary
http://terapix.iap.fr/rubrique.php?id_rubrique=241
as well as the Synoptic T0004 Table entry page
http://terapix.iap.fr/article.php?id_article=724
CFHT/CADC/Terapix
ps: attached is a 1% section of one of the Deep85 field gri color image.
(image/jpeg attachment: Deep_85p_T0004.jpg)