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 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 2003A&A...397..361Z
File Summary:
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FileName Lrecl Records Explanations
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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/* . 70 The contents of the catalog
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Byte-by-byte Description of file: filters.dat
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Bytes Format Units Label Explanations
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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)
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See also:
http://batc.bao.ac.cn/ : BATC Large Field Multi-Color Sky Survey Home Page
Byte-by-byte Description of file: summary.dat
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Bytes Format Units Label Explanations
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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)
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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
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Byte-by-byte Description of file: batc/*
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Bytes Format Units Label Explanations
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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
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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.
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Author's address:
Xu ZHOU , Zhaoji JIANG
Acknowledgements:
Hongfeng GUO
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References:
Fan, X., Burstein, D., Chen, J., et al. 1996AJ....112..628F 1996AJ....112..628F
Yan, H., Burstein, D., Fan, X., et al. 2000PASP..112..691Y 2000PASP..112..691Y
Zhou, X., Chen, J., Xu, W., et al. 1999PASP..111..909Z 1999PASP..111..909Z
Zhou, X., Jiang, Z., Xue, S., et al. 2001ChJAA...1..372Z 2001ChJAA...1..372Z
Zhou, X., Jiang, Z., Ma, J., et al. 2003A&A...397..361Z 2003A&A...397..361Z
(End) Chenzhou CUI [NAOC, China] 20-Jul-2005