[ASA] Fwd: [Kmos-3d] Call for spectroscopic data in extragalactic fields - Photometric redshift calibration for cosmological surveys

Mon Jun 4 09:02:29 AEST 2018

Hello,

Please circulate this on the mailing list to help our Euclid colleagues.

Many thanks,
Emily

---------- Forwarded message ----------
From: Audrey Galametz <Audrey.Galametz at unige.ch>
Date: Wed, May 30, 2018 at 9:49 PM
Subject: [Kmos-3d] Call for spectroscopic data in extragalactic fields -
Photometric redshift calibration for cosmological surveys
To: "euclid-ec-sgs-org at cosmos.esa.int" <euclid-ec-sgs-org at cosmos.esa.int>, "
euclid-ou-ext at cosmos.esa.int" <euclid-ou-ext at cosmos.esa.int>, "
euclid-ou-spe at cosmos.esa.int" <euclid-ou-spe at cosmos.esa.int>, "
csmct at stsci.edu" <csmct at stsci.edu>, "candels-mwcat at stsci.edu" <
candels-mwcat at stsci.edu>, "candels-sedphotz at stsci.edu" <
candels-sedphotz at stsci.edu>, "kmos-3d at lists.mpe.mpg.de" <
kmos-3d at lists.mpe.mpg.de>, "euclid-ou-mer at cosmos.esa.int" <
euclid-ou-mer at cosmos.esa.int>, "candels.riverside.ws at gmail.com" <
candels.riverside.ws at gmail.com>
Cc: "daniel.k.stern at gmail.com" <daniel.k.stern at gmail.com>, Stéphane Paltani
<Stephane.Paltani at unige.ch>, "fjcastander at gmail.com" <fjcastander at gmail.com>,
"capak at me.com" <capak at me.com>, "danmasters1 at gmail.com" <
danmasters1 at gmail.com>, Jean Coupon <Jean.Coupon at unige.ch>

*To the P.I. of any past or ongoing spectroscopic programs (large or small)
conducted within commonly observed extragalactic fields.*

*Please forward this call to mailing lists that may be relevant or
colleagues that may be concerned! Apologies if you receive this email more
than once.*

Besides their direct scientific value for studying galaxies, large
spectroscopic redshift samples are essential for properly training,
calibrating, and validating photometric redshifts. This becomes
particularly important and challenging for the next generation of
cosmological surveys, which require high precision photometric redshifts.
The photometric redshift teams for upcoming wide-field surveys such as
Euclid , LSST, and WFIRST have highlighted the need to build a reference
database of spectroscopic redshifts to train and later validate the various
photometric redshift methods being developed for these surveys. Such a
database will also be very useful for current programs.

We have started to collect spectroscopic redshifts in the following
commonly adopted calibration and/or deep fields split between the Euclid
primary and secondary calibration fields (but with the strong expectation
that these fields include the key calibration fields for other surveys):

Euclid Deep Fields:

   - North Ecliptic Pole: 1.8 deg radius circle centered at R.A.=17:58:56,
   Dec.=+66:01:04;
   - CDFS (including GOODS-S ): 1.8 deg radius circle centered at
   R.A.=3:32:49, Dec.=-26:16:41;

Primary Euclid Calibration Fields:

   - COSMOS: 2.5x2.5 deg2 region centered on R.A.=10:00:30, Dec.=+02:30:00;
   - VVDS: 1x1 deg2 region centered at R.A.=02:25:59, Dec.=+04:29:40;
   - GOODS-N: 1x1 deg2 region centered at R.A.=12:36:44, Dec.=+62:14:24;
   - SXDS: 2.5x2.5 deg2 region centered at R.A.=02:18:00, Dec.=-05:00:00;
   - EGS: 1x1 deg2 region centered at R.A.=14:19:27, Dec.=+52:40:56;
   - XMM-LSS/CFHT-LS W1: 9x8 deg2 region centered at R.A.=02:18:00,
   Dec.=-07:00:00.

Secondary Euclid Calibration Fields:

   - CFHT-LS D4: 1x1 deg2 region centered at R.A.=22:15:31, Dec.=-17:43:56;
   - CFHT-LS W2: 5x5 deg2 region centered at R.A.=08:57:49, Dec.=-03:19:00;
   - CFHT-LS W3: 7x7 deg2 region centered at R.A.=14:17:54, Dec.=+54:30:31;
   - CFHT-LS W2/SSA22: 5x5 deg2 region centered at R.A.=22:13:18
   Dec.=+01:19:00.

We note that the field characteristics may slightly change due to
operational constraints.

The goal is not only to collect spectroscopic redshifts in these fields but
also to merge redundant observations, investigate potential redshift
assignment discrepancies as well as homogenize the quality flag scheme.
Requirements on photometric redshift accuracy imposed by the cosmological
objectives of these Stage IV experiments demand that the spectroscopy used
for the photometric redshift training be as pure as possible.If you are
P.I. of past or on-going spectroscopic programs in these fields, we would
be much obliged if you were willing to allow us to incorporate your data
into a master spectroscopic database.

We note that we are creating this spectroscopic database for one purpose:
to improve the training/calibration of photometric redshifts for wide-field
extragalactic surveys. Ultimately, our goal is to provide a unique,
quality-homogenized master database of spectroscopic redshifts to the
scientific community. If you wish your data to remain private, however, and
be used only to help the survey photometric redshift calibration efforts,
we will not incorporate them into the public master catalogue.

*If you have data in these fields and would be willing to contribute to the
current effort, please contact us.*

At some stage, we may request 2D and 1D products in order to re-assign
redshifts and quality flag following the survey quality flag assessment.

Best regards,

Peter Capak (IPAC, Caltech, USA),
Jean Coupon (University of Geneva, CH),
Audrey Galametz (University of Geneva, CH),
Daniel Masters (JPL, USA),
Stéphane Paltani (University of Geneva, CH),
Daniel Stern (JPL, USA),
Francisco Castander (IEEC-CSIS, ES)

On behalf of the Euclid Organisation Unit for Photometric Redshifts
(OU-PHZ).

Signed letter available at: https://protect-au.mimecast.com/s/Ex9XCmOxDQtL1vXJsGUVld?domain=isdc.unige.ch
euclid/call-for-spectroscopic-data.html

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