CFHT Large Area U-Band Deep Survey
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1 CLAUDS + HSC SSP CFHT Large Area U-Band Deep Survey 20 deg 2 of u=27ab CFHT imaging in the HSC Deep Layer Marcin Sawicki on behalf of the CLAUDS team 1
2 HSC Strategic Survey Program 2
3 The power of U photo-z simulations by Masayuki Tanaka: U=25.5 U=27 zphot zspec 3
4 The power of U U-band gives: 1. better photometric redshifts (especially at z<0.5 and z~2 3): reduced scatter and catastrophic failure rates 2. z~2-3 U-dropout/BX/BM galaxy selection 3. improved SFR estimates (SFR=dM/dt) from massive young (blue) stars > improved SED fits 4. continuum for NB387 better than g-band > LAEs, Ly-alpha blobs at z~2.2 4
5 CLAUDS: the survey Goal: match HSC-Deep in u-band depth (U~27 AB, 5σ, 2 ) seeing (<1 ) area (20 deg 2 ) Project: CLAUDS (CFHT Large Area U-band Deep Survey) MegaCam on CFHT Canada + France + China awarded 375 hrs = 68 dark-time nights 5
6 MegaCam on 3.6m CFHT FOV = 1 deg 2 UV-sensitive CCDs (unlike most wide-field imagers) Superb site > great seeing (~0.85, in u-band) new high-throughput filters 6
7 HSC + CLAUDS filters new u old u* 7
8 CLAUDS: the survey combination of area & depth unmatched until LSST HSC SSP U(AB) limiting magnitude CANDELS HSC-UD (Taiwan CFHT) all IQ / best IQ CFHTLS-D CLAUDS CFHTLS-W CFHTLS -D best IQ represents 2, S/N=5 depth of the stacks (the 25%-ile stacks ) with seeing comparable to that which will be delivered with the dome-vented CFHTused in this project, and thus well-matched to the Subaru HSC seeing CLAUDS (this project) KiDS CFHT LuAU SCUSS ALTAS log (Area/sq deg) 8
9 CLAUDS: the survey new (CLAUDS) archival u data HSC Deep 9
10 CLAUDS: progress with data semester allocated C+F+C allocated (hrs) observed & validated (hrs) Observations completed in 2016B 2014B Images stacked & photo calibrated 2015A Aligned with HSC data (astrometry, pixels) 2015B Partial catalogs 2016A TO DO: Full HSCpipe-style catalogs 2016B TOTAL: hrs = 68.2 nights 240 hrs 10
11 Data processing Image processing (modified MegaPipe software) photometrically and astrometrically calibrated images in the HSC tract/patch format STEPHEN GWYN Photometry & catalogs HSC-like u+grizy catalogs (cmodel mags etc.) AND JEAN COUPON Data validation ANNEYA GOLOB SExtractor catalogs tests to validate data, assess quality etc. 11
12 CLAUDS: data examples Some HSC i and CFHT u data. i u Data above are in the XMM-LSS UD area (HSC Feb 2016 release) This is ~ what the final Deep Layer data will be like 12
13 U-band number counts u-band counts 4.5 deg2 in Deep 1.5 deg2 in UDDD CLAUDS done different ways: CLAUDS vs previous work: 13 ANNEYA GOLOB
14 Photometric redshifts photo-z s vs spec-z s XMM-LSS + E-COSMOS without u: with u: 14 ANNEYA GOLOB
15 Photometric redshifts 15 ANNEYA GOLOB
16 Stellar mass functions 4 sq deg of data (so far) not incompleteness corrected yet Total galaxy stellar mass functions INCOMPLETE PR RY A IN M I EL INCOMPLETE 16 ANNEYA GOLOB
17 Stellar mass functions 4 sq deg of data (so far) not incompleteness corrected yet By type: total, SF ing, Quiescent INCOMPLETE PR RY A IN M I EL INCOMPLETE 17 ANNEYA GOLOB
18 z~3 LBGs in CLAUDS+HSC
19 z~3 LBGs in CLAUDS+HSC here: 4.8 sq deg (XMM-LSS field) ~100,000 LBGs => 0.5M z~3 LBGs in whole 20 sq deg survey 4 3 LBG region u CLAUDS g HSC 2 1 CHENGZE LIU YUICHI HARIKANE YOSHIAKI ONO 0 1 Contour: star g HSC r HSC 19 MASAMI OUCHI
20 z~3 LBGs in CLAUDS+HSC Here: 0.6 sq deg in UDDD (we will have 30x more objects over whole survey) LFs: PRELIMINARY Clustering:
21 Summary CLAUDS is u-band (AB~27) that complements HSC-Deep We have recently completed Data quality tests are ongoing; data look very promising u-band depth is good, number counts good u-enhanced photo-z s performing well LBG selection looks good With the data in hand and largely reduced, we are now looking forward to doing science. 21
22 Taddy s questionnaire Q1. Science interests? Galaxy evolution at intermediate and high redshifts Q2. Ongoing collaborations with Subaru / other partner countries? Yes! (See this talk) Q3. Interest / potential for future collaborations? PFS SSP WF IR everything WF complement to JWST Q4. Size of Subaru projects? I am mostly interested in large, community-driven surveys such as HSC, PFS, and future ULTIMATE SSPs Q5. Subaru instruments? Wide-field everything Q6. Any request to Subaru science operation? None at present 22
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