J/MNRAS/379/1343 Infrared study of UKIDSS massive supercluster (Swinbank+, 2007)
The discovery of a massive supercluster at z=0.9 in the
UKIDSS Deep eXtragalactic Survey.
Swinbank A.M., Edge A.C., Smail I., Stott J.P., Bremer M., Sato Y.,
Van Breukelen C., Jarvis M., Waddington I., Clewley L., Bergeron J.,
Cotter G., Dye S., Geach J.E., Gonzalez-Solares E., Hirst P., Ivison R.J.,
Rawlings S., Simpson C., Smith G.P., Verma A., Yamada T.
<Mon. Not. R. Astron. Soc., 379, 1343-1351 (2007)>
=2007MNRAS.379.1343S 2007MNRAS.379.1343S
ADC_Keywords: Clusters, galaxy ; Galaxies, photometry ; Photometry, infrared
Keywords: galaxies: clusters: general - galaxies: high-redshif
Abstract:
We analyse the first publicly released deep field of the UK Infrared
Deep Sky Survey (UKIDSS) Deep eXtragalactic Survey to identify
candidate galaxy overdensities at z∼1 across ∼1deg2 in the ELAIS-N1
field. Using I-K, J-K and K-3.6um colours, we identify and
spectroscopically follow up five candidate structures with
Gemini/Gemini Multi-Object Spectrograph and confirm that they are all
true overdensities with between five and 19 members each.
Description:
We utilize the UKIDSS DXS EDR for the ELAIS-N1 region which covers a
contiguous area of 0.86x0.86deg2 centred on RA=16:11:14.400;
DE=+54:38:31:20 (J2000).
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 63 6 Properties of the cluster candidates
table2.dat 117 58 Member galaxies
table3.dat 106 75 Non-Member galaxies
--------------------------------------------------------------------------------
See also:
II/255 : SWIRE ELAIS N1 Source Catalogs (Surace+, 2004)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 5 A5 --- [SES2007] Cluster name
7- 8 I2 h RAh Right ascension (J2000)
10- 11 I2 min RAm Right ascension (J2000)
13- 16 F4.1 s RAs Right ascension (J2000)
18 A1 --- DE- Declination sign (J2000)
19- 20 I2 deg DEd Declination (J2000)
22- 23 I2 arcmin DEm Declination (J2000)
25- 26 I2 arcsec DEs Declination (J2000)
28- 29 I2 --- Nslits ? Number of spectroscopic slits on the mask
31- 32 I2 --- Ncl Number of confirmed cluster members
34- 39 F6.4 --- z Redshift
41- 46 F6.4 --- e_z rms uncertainty on z
48- 51 I4 km/s sigma Velocity dispersion of the spectroscopic sample
53- 55 I3 km/s e_sigma rms uncertainty on sigma
57- 59 I3 km/s sigma' ? Velocity dispersion after removal of
substructure
61- 63 I3 km/s e_sigma' ? rms uncertainty on sigma'
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table[23].dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 F4.2 --- zCl ? Cluster Redshift (only in table2)
6- 10 A5 --- [SES2007] Cluster name
11 A1 --- --- [-]
12- 13 I2 --- Gal Galaxy number in the cluster (1)
15 I1 --- n_Gal [1/4]? Individual note on Gal (2)
17- 18 I2 h RAh Right ascension (J2000)
20- 21 I2 min RAm Right ascension (J2000)
23- 28 F6.3 s RAs Right ascension (J2000)
30 A1 --- DE- Declination sign (J2000)
31- 32 I2 deg DEd Declination (J2000)
34- 35 I2 arcmin DEm Declination (J2000)
37- 41 F5.2 arcsec DEs Declination (J2000)
43- 47 F5.2 mag Imag Johnson I magnitude
49- 52 F4.2 mag e_Imag rms uncertainty on Imag
54- 58 F5.2 mag Jmag Johnson J magnitude
60- 63 F4.2 mag e_Jmag rms uncertainty on Jmag
65- 69 F5.2 mag Kmag Johnson K magnitude
71- 74 F4.2 mag e_Kmag rms uncertainty on Kmag
76- 80 F5.2 mag 3.6mag ?=- Magnitude at 3.6um (3)
82- 86 F5.2 mag 4.5mag ?=- Magnitude at 4.5um (3)
88- 92 F5.2 mag 5.8mag ?=- Magnitude at 5.8um (3)
94- 98 F5.2 mag 24mag ?=- Magnitude at 24um (3)
100-106 F7.5 --- z ?=- Redshift
108-109 I2 10-5 e_z ? Error on z (lower limit) (only in table2)
111-112 I2 10-5 E_z ? Error on z (upper limit) (only in table2)
114-117 A4 --- SpType Spectral morphological type (only in table2)
--------------------------------------------------------------------------------
Note (1): Galaxies identified as [SES2007] Cluster-Gal, in Simbad, i.e.
[SES2007] DXS2-NN for DXS2 galaxies.
Note (2): Individual notes as follows:
1 = Lenses: We have searched for any unidentified lines in the
spectra to search for lensed background galaxies and identify
one candidate from the cluster and two from the field population.
DXS1-11 has unambiguous identification of [OII]3727, Ca H&K and
G band for z=0.89, but we also identify weak line emission at
8594.5 (spatial offset <0.5") which we tentatively identify as
[OII]3727 at z=1.306.
2 = Noteworthy objects. We note that the brightest cluster member in
DXS4b at z=1.09 has a number of high ionization lines such as
[NeV]3346,3426 and [NeIII]3343,3868.7. The strong 24um detection
suggests that this galaxy contains a highly obscured AGN,
although it has a low infrared luminosity (~<5x1011L☉
from the lack of a 70-m detection).
3 = Lenses. DXS2-9 is a z=0.67 galaxy through identification of
Ca H&K, H4861 and [OIII]4959,5007. However, we also identify
[OII]3727 and Ca H&K at 8109, 8555 and 8632Å respectively
(spatial offset <0.5") giving a redshift of z=1.175
4 = DXS3-28 is identified as a z=0.67 galaxy from [OII]3727 emission
and Ca H&K absorption. However, spatially offsetting by ∼0.75"
to the south, we also identify line emission at
6748,8801,8979&9067Å which corresponds to redshifted
[OII]3727, Hβ and [OIII]4959,5007 for z=0.81.
Note (3): Note that 1Jy corresponds to mAB=23.90.
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 06-Dec-2007