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II/262      BATC Data Release One - BATC DR1             (Zhou+ 1995-2005)

Large Field Multi-Color Sky Survey Data Release One - BATC DR1 Xu ZHOU, Zhaoji JIANG <National Astronomical Observatories of China (1995-2005)>
ADC_Keywords: Colors; Galaxies, photometry; Photometry, special systems Description: Multi-color photometry data of the project, "Large Field Multi-Color Sky Survey" supported by Beijing-Arizona-Taiwan-Connecticut (BATC) is presented. From 1995 to 2004, 110 58'x58' sky survey fields have been observed. First release of BATC catalog includes observation results for 511842 sources located in 70 sky survey fields. The whole release is divided into 70 files. Each file corresponds to one observation field. The BATC filter system includes 15 intermediate band filters, covering a range in optical wavelengths from 300 to 1000 nm. The telescope used is a 60/90 cm f/3 Schmidt telescope located at Xinglong Station of National Astronomical Observatories. A Ford Aerospace 2048x2048 CCD camera with 15 micron pixel size is mounted at the Schmidt focus of the telescope. The field of view of the CCD is 58'x58' with a plate scale of 1.7arcsec per pixel. The BATC magnitude system adopts the AB magnitude system, defining as Mbatc = -2.5log(Fν) - 48.60 where Fν is the flux per unit frequency in units of erg/s/cm2/Hz, and Fν={Sum}[d(logν)*fν*Rν]/{Sum}[d(logν)*Rν] where Rν represents the response of the system. Four Oke & Gunn (1983ApJ...266..713O) standards, HD 19445, HD 84937, BD+26 2606 and BD+17 4708 are observed in photometric nights for flux calibration. We provide catalogues down to i-band (666nm) about 20 mag with complete spectral energy distributions (SEDs) for each object. Typical error in photometry is about 0.02-0.05 mag. There is usually the deepest observation at i-band. Most of the catalogs use i-band data as their reference for coordinate calibration. While, "T0329","TA01" and "TA03" use j-band as reference. All colors in the "TA04" catalog have no photo calibration. For detailed information of the data reduction, please refer to: Zhou, X., Jiang, Z., Ma, J., et al. 2003, 2003A&A...397..361Z File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file filters.dat 112 7001 Transmission curves of the 15 filters summary.dat 54 70 Basic information for the following files batc/* 235 70 The contents of the catalog
Byte-by-byte Description of file: filters.dat
Bytes Format Units Label Explanations
1- 5 I5 0.1nm lambda Wavelength in Angstroms 6- 7 A2 --- --- [.0] 8-112 15F7.4 --- T(lambda) Transmission of the 15 filters (see also the "Filter characteristics" section below)
See also: http://batc.bao.ac.cn/ : BATC Large Field Multi-Color Sky Survey Home Page Byte-by-byte Description of file: summary.dat
Bytes Format Units Label Explanations
1- 4 A4 --- Field Field name 6- 7 I2 h RAh Right ascension (J2000.0) of field center 9- 10 I2 min RAm Right ascension (J2000.0) of field center 12- 16 F5.2 s RAs Right ascension (J2000.0) of field center 18 A1 --- DE- Declination sign (J2000.0) of field center 19- 20 I2 deg DEd Declination (J2000.0) of field center 22- 23 I2 arcmin DEm Declination (J2000.0) of field center 25- 28 F4.1 arcsec DEs Declination (J2000.0) of field center 30- 31 I2 --- FN Number of filters available in this field 34- 38 I5 --- Nsrc Number of sources in the file 40- 54 A15 --- Filter [.a-km-p] List of filters in this field (see the "Filter characteristics" section below)
Filter characteristics: --------------------------------- Filter Code cw(nm) FWHM(nm) --------------------------------- a 336.0 36 b 389.0 34 c 421.0 32 d 455.0 34 e 492.5 39 f 527.0 34 g 579.5 31 h 607.5 31 i 666.0 48 j 705.0 30 k 749.0 33 m 802.0 26 n 848.0 18 o 919.0 26 p 974.5 27 --------------------------------- Byte-by-byte Description of file: batc/*
Bytes Format Units Label Explanations
1 A1 --- Rem Comment (1) 2- 6 I5 --- Seq Sequence Number in the field 8- 9 I2 h RAh Right Ascension J2000 (hours) 11- 12 I2 min RAm Right Ascension J2000 (minutes) 14- 18 F5.2 s RAs Right Ascension J2000 (seconds) 20 A1 --- DE- Declination J2000 (sign) 21- 22 I2 deg DEd Declination J2000 (degrees) 24- 25 I2 arcmin DEm Declination J2000 (minutes) 27- 30 F4.1 arcsec DEs Declination J2000 (seconds) 32- 44 A13 --- USNO-A2.0 Designation in USNO-A2.0 (I/252) catalogue 46- 49 F4.1 mag Bmag ?Magnitude from blue plate (USNO-A2.0) 51- 54 F4.1 mag Rmag ?Magnitude from red plate (USNO-A2.0) 57- 61 F5.2 mag aMag ? AB magnitude from a filter (336±36nm) 63 A1 --- n_aMag [X] Mark on magnitude from a filter (2) 64- 67 F4.2 mag e_aMag ? Error on magnitude from a filter 69- 73 F5.2 mag bMag ? AB magnitude from b filter (389±34nm) 75 A1 --- n_bMag [X] Mark on magnitude from b filter (2) 76- 79 F4.2 mag e_bMag ? Error on magnitude from b filter 81- 85 F5.2 mag cMag ? AB magnitude from c filter (421±32nm) 87 A1 --- n_cMag [X] Mark on magnitude from c filter (2) 88- 91 F4.2 mag e_cMag ? Error on magnitude from c filter 93- 97 F5.2 mag dMag ? AB magnitude from d filter (455±34nm) 99 A1 --- n_dMag [X] Mark on magnitude from d filter (2) 100-103 F4.2 mag e_dMag ? Error on magnitude from d filter 105-109 F5.2 mag eMag ? AB magnitude from e filter (492.5±39nm) 111 A1 --- n_eMag [X] Mark on magnitude from e filter (2) 112-115 F4.2 mag e_eMag ? Error on magnitude from e filter 117-121 F5.2 mag fMag ? AB magnitude from f filter (527±34nm) 123 A1 --- n_fMag [X] Mark on magnitude from f filter (2) 124-127 F4.2 mag e_fMag ? Error on magnitude from f filter 129-133 F5.2 mag gMag ? AB magnitude from g filter (579.5±31nm) 135 A1 --- n_gMag [X] Mark on magnitude from g filter (2) 136-139 F4.2 mag e_gMag ? Error on magnitude from g filter 141-145 F5.2 mag hMag ? AB magnitude from h filter (607.5±31nm) 147 A1 --- n_hMag [X] Mark on magnitude from h filter (2) 148-151 F4.2 mag e_hMag ? Error on magnitude from h filter 153-157 F5.2 mag iMag ? AB magnitude from i filter (666±48nm) 159 A1 --- n_iMag [X] Mark on magnitude from i filter (2) 160-163 F4.2 mag e_iMag ? Error on magnitude from i filter 165-169 F5.2 mag jMag ? AB magnitude from j filter (705±30nm) 171 A1 --- n_jMag [X] Mark on magnitude from j filter (2) 172-175 F4.2 mag e_jMag ? Error on magnitude from j filter 177-181 F5.2 mag kMag ? AB magnitude from k filter (749±33nm) 183 A1 --- n_kMag [X] Mark on magnitude from k filter (2) 184-187 F4.2 mag e_kMag ? Error on magnitude from k filter 189-193 F5.2 mag mMag ? AB magnitude from m filter (802±26nm) 195 A1 --- n_mMag [X] Mark on magnitude from m filter (2) 196-199 F4.2 mag e_mMag ? Error on magnitude from m filter 201-205 F5.2 mag nMag ? AB magnitude from n filter (848±18nm) 207 A1 --- n_nMag [X] Mark on magnitude from n filter (2) 208-211 F4.2 mag e_nMag ? Error on magnitude from n filter 213-217 F5.2 mag oMag ? AB magnitude from o filter (919±26nm) 219 A1 --- n_oMag [X] Mark on magnitude from o filter (2) 220-223 F4.2 mag e_oMag ? Error on magnitude from o filter 225-229 F5.2 mag pMag ? AB magnitude from p filter (974.5±27nm) 231 A1 --- n_pMag [X] Mark on magnitude from p filter (2) 232-235 F4.2 mag e_pMag ? Error on magnitude from p filter
Note (1): The first character of each object marks some special character of the object checked by naked eyes: b = saturated bright star, coordinates may inaccurate d = polluted (CCD defect etc.) e = near the edge and some band objects out of frame f = very faint object but visible g = galaxies determined by naked eyes m = blended with nearby stars of similar brightness n = Could not find the object by naked eyes s = effected by bright star pollution (in halo or spark) t = polluted by galaxies x = may be false object detected star on bright galaxies Note (2): For some objects, if we have not got magnitude of PSF fitting in normal way, the aperture magnitude is used instead of PSF magnitude and the character X is marked before the error of the magnitude.
Author's address: Xu ZHOU , Zhaoji JIANG Acknowledgements: Hongfeng GUO References: Fan, X., Burstein, D., Chen, J., et al. 1996AJ....112..628F Yan, H., Burstein, D., Fan, X., et al. 2000PASP..112..691Y Zhou, X., Chen, J., Xu, W., et al. 1999PASP..111..909Z Zhou, X., Jiang, Z., Xue, S., et al. 2001ChJAA...1..372Z Zhou, X., Jiang, Z., Ma, J., et al. 2003A&A...397..361Z
(End) Chenzhou CUI [NAOC, China] 20-Jul-2005
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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