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
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 117 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.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
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