J/AJ/147/106 Catalog of member galaxies in A2319 (Yan+, 2014)
Multicolor photometry of the merging galaxy cluster A2319: dynamics and star
formation properties.
Yan P.-F., Yuan Q.-R., Zhang L., Zhou X.
<Astron. J., 147, 106 (2014)>
=2014AJ....147..106Y 2014AJ....147..106Y
ADC_Keywords: Clusters, galaxy ; Morphology ; Redshifts
Keywords: galaxies: clusters: individual: A2319 -
galaxies: distances and redshifts - methods: data analysis -
galaxies: kinematics and dynamics
Abstract:
Asymmetric X-ray emission and a powerful cluster-scale radio halo
indicate that A2319 is a merging cluster of galaxies. This paper
presents our multicolor photometry for A2319 with 15 optical
intermediate filters in the Beijing-Arizona-Taiwan-Connecticut (BATC)
system. There are 142 galaxies with known spectroscopic redshifts
within the viewing field of 58'x58' centered on this rich cluster,
including 128 member galaxies (called sample I). A large velocity
dispersion in the rest frame, 1622-70+91km/s, suggests merger
dynamics in A2319. The contour map of projected density and localized
velocity structure confirm the so-called A2319B substructure, at ∼10'
northwest to the main concentration A2319A. The spectral energy
distributions (SEDs) of more than 30000 sources are obtained in our
BATC photometry down to V∼20mag. A u-band (∼3551Å) image with
better seeing and spatial resolution, obtained with the Bok 2.3m
telescope at Kitt Peak, is taken to make star-galaxy separation and
distinguish the overlapping contamination in the BATC aperture
photometry. With color-color diagrams and photometric redshift
technique, 233 galaxies brighter than hBATC=19.0 are newly selected
as member candidates after an exclusion of false candidates with
contaminated BATC SEDs by eyeball-checking the u-band Bok image. The
early-type galaxies are found to follow a tight color-magnitude
correlation. Based on sample I and the enlarged sample of member
galaxies (called sample II), subcluster A2319B is confirmed. The star
formation properties of cluster galaxies are derived with the
evolutionary synthesis model, PEGASE, assuming a Salpeter initial mass
function and an exponentially decreasing star formation rate (SFR). A
strong environmental effect on star formation histories is found in
the manner that galaxies in the sparse regions have various star
formation histories, while galaxies in the dense regions are found to
have shorter SFR time scales, older stellar ages, and higher
interstellar medium metallicities. For the merging cluster A2319,
local surface density is a better environmental indicator rather than
the cluster-centric distance. Compared with the well-relaxed cluster
A2589, a higher fraction of star-forming galaxies is found in A2319,
indicating that the galaxy-scale turbulence stimulated by the
subcluster merger might have played a role in triggering the star
formation activity.
Description:
The Beijing-Arizona-Taiwan-Connecticut (BATC) multicolor photometric
observations were taken with the 60/90cm f/3 Schmidt Telescope of the
National Astronomical Observatories, Chinese Academy of Sciences
(NAOC), located at the Xinglong site at an altitude of 900m. The
photometric system contains 15 intermediate-band filters, namely, a-k,
m-p, covering almost the whole optical wavelength range from ∼3000 to
10000Å.
From 2003 January to 2008 May, images for A2319 in 15 bands have been
obtained with the total exposure time more than 52hr
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 39 128 Catalog of 128 spectroscopically confirmed
member galaxies in A2319
table4.dat 34 233 Catalog of 233 newly selected member galaxies
in A2319
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See also:
VII/110 : Rich Clusters of Galaxies (Abell+ 1989)
VII/4 : Abell and Zwicky Clusters of Galaxies (Abell+ 1974)
J/other/RAA/12.1381 : BATC photometry on A119 (Tian+, 2012)
J/ApJS/199/26 : The 2MASS Redshift Survey (2MRS) (Huchra+, 2012)
J/AJ/141/99 : BATC and SDSS photometry of A2589 cluster (Liu+, 2011)
J/other/RAA/10.1 : BATC photometry in A98 cluster (Zhang+, 2010)
J/ApJS/149/53 : Multicolor photometry of A2255 galaxies (Yuan+, 2003)
J/A+A/397/361 : BATC photometry of Landolt SA95 field (Zhou+, 2003)
J/AJ/122/1718 : Multicolor photometry in Abell 2634 (Yuan+, 2001)
J/ApJS/112/245 : Redshift survey for IRAS galaxies (Nakanishi+ 1997)
J/AJ/112/1803 : Large Scale Structure (Marzke+ 1996)
J/AJ/112/628 : BATC Color Survey of M67 (Fan+ 1996)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 I3 --- Galaxy [1/128] Running sequence number of the galaxy
<[YYZ2014] I NNN> in Simbad
5- 15 F11.7 deg RAdeg Right Ascension (J2000)
17- 26 F10.7 deg DEdeg Declination (J2000)
28- 35 F8.6 --- zsp Spectroscopic redshift
37 A1 --- Sub [AB] A=main cluster A2319A, B=subcluster A2319B
39 A1 --- Ref Reference (1)
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Note (1): Reference code defined as follows:
1 = Oegerle et al. (1995AJ....110...32O 1995AJ....110...32O);
2 = Faber & Dressler (1977AJ.....82..187F 1977AJ.....82..187F);
3 = de Vaucouleurs et al. 1991 (cat. VII/155);
4 = Marzke et al. 1996 (cat. J/AJ/112/1803);
5 = Nakanishi et al. 1997 (cat. J/ApJS/112/245);
6 = Huchra et al. 2012 (cat. J/ApJS/199/26).
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 I3 --- Galaxy [1/233] Running sequence number of the galaxy
<[YYZ2014] II NNN> in Simbad
5- 15 F11.7 deg RAdeg Right Ascension (J2000) (1)
17- 26 F10.7 deg DEdeg Declination (J2000) (1)
28- 32 F5.3 --- zph Photometric redshift
34 I1 --- MT [1/7] Morphological classification (2)
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Note (1): Beijing-Arizona-Taiwan-Connecticut (BATC)-detected celestial
coordinates.
Note (2): Hubble type of the best-fit template, numbered as follows:
1 = E;
2 = S0;
3 = Sa;
4 = Sb;
5 = Sc;
6 = Sd;
7 = Irr.
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History:
From electronic version of the journal
(End) Sylvain Guehenneux [CDS] 15-Sep-2014