J/AJ/112/2500 JHK' photometry of 4 clusters of galaxies (McLean+ 1996)
Near infrared JHK photometry of intermediate redshift clusters
McLean I.S., Teplitz H.
<Astron. J. 112, 2500 (1996)>
=1996AJ....112.2500M 1996AJ....112.2500M (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, galaxy ; Photometry, infrared
Abstract:
Deep near-infrared images of four intermediate redshift (z=0.2-0.4)
clusters (Abell 370, Abell 963, CL 0024+1654 and CL 0909+4408) have
been obtained in the J, H, and K bands using the UCLA Two-Channel IR
Camera with a spatial resolution of ∼1". The 3'x3' field of view
includes over 100 galaxies in each cluster. Photometry has been
obtained with 1σ or limiting magnitudes of 21.7 at J, 21.0 at H,
and 20.4 at K', and complete to 2 magnitudes fainter than L*. Data
reduction techniques for flat-fielding object identification, and
photometry of faint object crowded fields are discussed. The best
method is the subtraction of a running-average sky made from object
frames. The photometry is cross referenced to previous catalogs, and
infrared color-magnitude diagrams are presented. Comparison of the IR
colors of these four clusters to the predictions of the spectral
synthesis models of Bruzual and Chariot is discussed. There is a
discrepancy between the models and the observations of several tenths
of a magnitude in the colors. Photometry has also been obtained for
the gravitational lensing arcs in CL 0024+1654, which is consistent
with an actively star-forming galaxy at z>1.
For a description of the JHK' photometric system, see e.g. GCPD/09
Objects:
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RA (2000) DE Designation(s)
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02 39.8 -01 35 Abell 370 = ClG 0237.3-0148
10 17.2 +39 02 Abell 963 = ClG 1014.2+3917
00 26 32.5 +17 09 43 ClG 0024+1654
09 52 57.1 +43 55 28 ClG 0909+4408
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3 45 134 JHK' photometry of Abell 370.
table4 45 135 JHK' photometry of CL 0024+1654
table5 45 82 JHK' Photometry of Abell 963.
table6 45 61 JHK' photometry of CL 0909+4408
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Byte-by-byte Description of file: table3 table5
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Bytes Format Units Label Explanations
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1- 3 I3 --- No Object number in cluster
5- 7 I3 --- BO ? Butcher and Oemler (1978ApJ...219...18B 1978ApJ...219...18B) number
9- 15 F7.3 pix xpos x position (1)
17- 22 F6.2 pix ypos y position (1)
23 A1 --- n_ypos [a] Note (2)
25- 30 F6.3 mag Jmag J magnitude (1.2um)
31 A1 --- n_Jmag [a] Note (2)
33- 38 F6.3 mag Hmag ? H magnitude (1.65um)
40- 45 F6.3 mag K'mag K' magnitude (2.1um)
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Note (1): 1 pix = 0.68". North is up, East is to the left
Note (2): a : This object is poorly resolved from its neighbor
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Byte-by-byte Description of file: table4 table6
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Bytes Format Units Label Explanations
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1- 3 I3 --- No Object number in cluster
5- 7 I3 --- DG ? Dressler and Gunn (1992, Cat. J/ApJS/78/1)
number
9- 15 F7.3 pix xpos x position (1)
17- 22 F6.2 pix ypos y position (1)
23 A1 --- n_ypos [a] Note (2)
25- 30 F6.3 mag Jmag J magnitude (1.2um)
31 A1 --- n_Jmag [a] Note (2)
33- 38 F6.3 mag Hmag ? H magnitude (1.65um)
40- 45 F6.3 mag K'mag K' magnitude (2.1um)
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Note (1): 1 pix = 0.68". North is up, East is to the left
Note (2): a : This object is poorly resolved from its neighbor
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History: Prepared via OCR at CDS.
(End) James Marcout, Patricia Bauer [CDS] 30-Sep-1997