J/ApJS/149/53 Multicolor photometry of A2255 galaxies (Yuan+, 2003)
Multicolor photometry of the galaxies in A2255 by the
Beijing-Arizona-Taiwan-Connecticut Survey and Sloan Digital Sky Survey.
Yuan Q., Zhou X., Jiang Z.
<Astrophys. J. Suppl. Ser. 149, 53 (2003)>
=2003ApJS..149...53Y 2003ApJS..149...53Y
ADC_Keywords: Clusters, galaxy ; Redshifts ; Photometry, SDSS
Keywords: galaxies: clusters: individual (A2255) -
galaxies: distances and redshifts - galaxies: fundamental parameters -
galaxies: photometry - methods: data analysis
Abstract:
We present our optical multicolor photometry for the nearby
cluster of galaxies A2255 with 13 intermediate filters in the
Beijing-Arizona-Taiwan-Connecticut (BATC) system (see Cat. II/262),
which cover an optical wavelength range from 3000 to 10000Å. The
spectral energy distributions (SEDs) in the optical band for more than
7000 sources are achieved down to V∼20 in a field of 58'x58' entered
on this rich cluster. A2255 has been observed by the Sloan Digital
Sky Survey (SDSS) down to V∼17.5 spectroscopically and r'∼22.0
photometrically. A method of combining the SDSS photometric data in
five broad bands and the BATC SEDs is then explored. A sample of 254
galaxies with known redshifts in the region of A2255 is constructed
for testing the reliability of the method of combining SEDs. Our
application of the technique of photometric redshift on this sample
shows that the combined SEDs with higher resolution could lead to a
more accurate estimate of photometric redshift. Based on 214
spectroscopically confirmed member galaxies, spatial and dynamical
properties of this cluster are studied.
Description:
The BATC photometric observations of A2255 were taken with the 60/90cm
f/3 Schmidt Telescope of BAO, located at the Xinglong site with an
altitude of 900m. A Ford 2048x2048 CCD camera was equipped at the
prime focus of the telescope. The field of view was ∼1.0 square
degree, and the spatial scale was 1.7" per pixel. The combined image
in each filter covers a sky region of 59x59arcmin2, defined by a
right ascension range from 17:08:03.7 to 17:16:8.6, and a declination
range from +63:36:31.5 to +64:35:28.8 (J2000.0). The BATC filter
system includes 15 intermediate-band filters, namely, a-k, m-p,
covering the whole optical wavelength range from ∼3000 to 10000Å.
For distinguishing explicitly between the SDSS and BATC filter names,
in this paper we refer to the SDSS filters and magnitudes as u', g',
r', i', and z', which correspond to central wavelengths of 3560, 4680,
6180, 7500, and 8870Å.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 152 254 The combined SEDs of 254 known galaxies in the
region of Abell 2255
table4.dat 152 313 The combined SEDs of 313 newly-selected member
galaxies in the region of Abell 2255
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See also:
II/262 : BATC Data Release One - BATC DR1 (Zhou+ 1995-2005)
J/AJ/125/1817 : SDSS Early-Type Galaxies Catalog (Bernardi+, 2003)
Byte-by-byte Description of file: table2.dat table4.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- [YZJ2003] Galaxy number (1)
5- 6 I2 h RAh Hour of Right Ascension (J2000)
8- 9 I2 min RAm Minute of Right Ascension (J2000)
11- 15 F5.2 s RAs Second of Right Ascension (J2000)
16 A1 --- DE- Declination sign
17- 18 I2 deg DEd Degree of Declination (J2000)
20- 21 I2 arcmin DEm Arcminute of Declination (J2000)
23- 27 F5.2 arcsec DEs Arcsecond of Declination (J2000)
29- 36 F8.6 --- zsp ? NED spectroscopic redshift (table2 only)
38- 42 F5.3 --- zph Estimated photometric redshift from combined SED
44 I1 --- Ttype ? Morphology type (table4 only) (2)
46- 50 F5.2 mag bmag Aperture-corrected b band (0.40um) magnitude (3)
52- 56 F5.2 mag dmag Aperture-corrected d band (0.45um) magnitude (3)
58- 62 F5.2 mag emag Aperture-corrected e band (0.49um) magnitude (3)
64- 68 F5.2 mag fmag Aperture-corrected f band (0.54um) magnitude (3)
70- 74 F5.2 mag gmag Aperture-corrected g band (0.57um) magnitude (3)
76- 80 F5.2 mag hmag Aperture-corrected h band (0.60um) magnitude (3)
82- 86 F5.2 mag imag Aperture-corrected i band (0.66um) magnitude (3)
88- 92 F5.2 mag jmag Aperture-corrected j band (0.70um) magnitude (3)
94- 98 F5.2 mag kmag Aperture-corrected k band (0.75um) magnitude (3)
100-104 F5.2 mag mmag Aperture-corrected m band (0.80um) magnitude (3)
106-110 F5.2 mag nmag Aperture-corrected n band (0.85um) magnitude (3)
112-116 F5.2 mag omag Aperture-corrected o band (0.92um) magnitude (3)
118-122 F5.2 mag pmag Aperture-corrected p band (0.98um) magnitude (3)
124-128 F5.2 mag u'mag Aperture-corrected SDSS u' band magnitude
130-134 F5.2 mag g'mag Aperture-corrected SDSS g' band magnitude
136-140 F5.2 mag r'mag Aperture-corrected SDSS r' band magnitude
142-146 F5.2 mag i'mag Aperture-corrected SDSS i' band magnitude
148-152 F5.2 mag z'mag Aperture-corrected SDSS z' band magnitude
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Note (1): Sorted by the distance to the cluster center.
Note (2): Morphological type:
1 = E; 2 = S0; 3 = Sa; 4 = Sb; 5 = Sc; 6 = Sd; 7 = Im
Note (3): BATC filters are described in Cat. II/262;
special values of magnitude are:
0.0 = out of field;
99.00 = too faint to be detected.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Bauer [CDS] 17-Nov-2003