J/MNRAS/372/1621 SCUBA Half-Degree Extragalactic Survey. II (Coppin+, 2006)
The SCUBA Half-Degree Extragalactic Survey (SHADES).
II. Submillimetre maps, catalogue and number counts.
Coppin K., Chapin E.L., Mortier A.M.J., Scott S.E., Borys C., Dunlop J.S.,
Halpern M., Hughes D.H., Pope A., Scott D., Serjeant S., Wagg J.,
Alexander D.M., Almaini O., Aretxaga I., Babbedge T., Best P.N., Blain A.,
Chapman S., Clements D.L., Crawford M., Dunne L., Eales S.A., Edge A.C.,
Farrah D., Gaztanaga E., Gear W.K., Granato G.L., Greve T.R., Fox M.,
Ivison R.J., Jarvis M.J., Jenness T., Lacey C., Lepage K., Mann R.G.,
Marsden G., Martinez-Sansigre A., Oliver S., Page M.J., Peacock J.A.,
Pearson C.P., Percival W.J., Priddey R.S., Rawlings S., Rowan-Robinson M.,
Savage R.S., Seigar M., Sekiguchi K., Silva L., Simpson C., Smail I.,
Stevens J.A., Takagi T., Vaccari M., Van Kampen E., Willott C.J.
<Mon. Not. R. Astron. Soc., 372, 1621-1652 (2006)>
=2006MNRAS.372.1621C 2006MNRAS.372.1621C
ADC_Keywords: Surveys ; Millimetric/submm sources
Keywords: surveys - galaxies: evolution - galaxies: formation -
galaxies: starburst - cosmology: observations - submillimetre
Abstract:
We present maps, source catalogue and number counts of the largest,
most complete and unbiased extragalactic submillimetre survey: the
850-m SCUBA Half-Degree Extragalactic Survey (SHADES). Using the
Submillimetre Common-User Bolometer Array (SCUBA) on the James Clerk
Maxwell Telescope (JCMT), SHADES mapped two separate regions of sky:
the Subaru/XMM-Newton Deep Field (SXDF) and the Lockman Hole East (LH).
Encompassing 93 per cent of the overall acquired data (i.e. data taken
up to 2004 February 1), these SCUBA maps cover 720arcmin2 with a rms
noise level of about 2mJy and have uncovered >100 submillimetre
galaxies. In order to ensure the utmost robustness of the resulting
source catalogue, data reduction was independently carried out by four
subgroups within the SHADES team, providing an unprecedented degree of
reliability with respect to other SCUBA catalogues available from the
literature. Individual source lists from the four groups were combined
to produce a robust 120-object SHADES catalogue; an invaluable
resource for follow-up campaigns aiming to study the properties of a
complete and consistent sample of submillimetre galaxies. For the
first time, we present deboosted flux densities for each submillimetre
galaxy found in a large survey. Extensive simulations and tests were
performed separately by each group in order to confirm the robustness
of the source candidates and to evaluate the effects of false
detections, completeness and flux density boosting. Corrections for
these effects were then applied to the data to derive the
submillimetre galaxy source counts. SHADES has a high enough number of
detected sources that meaningful differential counts can be estimated,
unlike most submillimetre surveys which have to consider integral
counts. We present differential and integral source number counts and
find that the differential counts are better fit with a broken power
law or a Schechter function than with a single power law; the SHADES
data alone significantly show that a break is required at several mJy,
although the precise position of the break is not well constrained. We
> also find that a 850-m survey complete down to 2mJy would resolve
> 20-30 per cent of the far-infrared background into point sources.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 118 120 The 850-um SHADES catalogue for the LH and SXDF
regions
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See also:
J/MNRAS/370/1057 : Blank-field SCUBA surveys (Scott+ 2006)
J/MNRAS/379/1571 : SCUBA Half-Degree Extragalactic Survey. IV (Aretxaga+, 2007)
J/MNRAS/380/199 : SCUBA Half-Degree Extragalactic Survey. III (Ivison+, 2007)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- --- [SHADES]
8- 21 A14 --- SHADES SHADES designation (JHHMMSS+DDMMSS)
23- 33 A11 --- [CCM2006] Name (LOCK850.NNN or SXDF850.NNN)
35- 36 I2 h RAh Right ascension (J2000)
38- 39 I2 min RAm Right ascension (J2000)
41- 45 F5.2 s RAs Right ascension (J2000)
47 A1 --- DE- Declination sign (J2000)
48- 49 I2 deg DEd Declination (J2000)
51- 52 I2 arcmin DEm Declination (J2000)
54- 57 F4.1 arcsec DEs Declination (J2000)
59- 63 F5.2 mJy S850um Flux density at 850um
65- 67 F3.1 mJy E_S850um Error on S850um (Upper limit)
69- 71 F3.1 mJy e_S850um Error on S850um (Lower limit)
73- 75 F3.1 --- S/N map signal-to-noise ration
77- 79 F3.1 mJy MapS850 Map noise estimate at 850um
81 A1 --- l_S450um Limit flag on S450um
82- 84 I3 mJy S450um Flux density at 450um (3σ limit)
85 A1 --- n_S450um [g] Note on S450um (1)
87-112 A26 --- Com Comments (2)
114-118 A5 --- Notes Individual notes (1)
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Note (1): Notes as follows:
a = This source was identified by all four groups with a S/N>3
b = This source was identified by three groups with a S/N>3
c = This source was identified by two groups with a S/N>3
d = This source was identified by one additional group with 2.5<S/N<3
e = This source was identified by two additional groups with 2.5<S/N<3
f = This source is mildly affected by the noise spike (cf. Appendix A)
g = This source has a hint of flux at 450um measured at the SHADES
catalogue positions at a significance level >3σ
(see Fig. 21).
Note (2): Corresponding SCUBA 8mJy survey IDs (Scott et al.
2002MNRAS.331..817S 2002MNRAS.331..817S) and new IDs from the reduction of Scott et al.
(2006, Cat. J/MNRAS/370/1057), along with an indication of how many
groups detected each source.
χs = this source has a relatively poor spatial χ2 fit.
χt = this source has a relatively poor temporal χ2 fit.
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History:
* 10-Aug-2007: From electronic version of the journal
* 12-Dec-2008: Source SHADES J105130+572036 has a RA off by 1min;
error fixed at CDS with an additional comment.
References:
Mortier et al., Paper I 2005MNRAS.363..563M 2005MNRAS.363..563M
Ivison et al., Paper III 2007MNRAS.380..199I 2007MNRAS.380..199I, Cat. J/MNRAS/380/199
Aretxaga et al., Paper IV 2007MNRAS.379.1571A 2007MNRAS.379.1571A, Cat. J/MNRAS/379/1571
Takagi et al., Paper V 2007MNRAS.381.1154T 2007MNRAS.381.1154T
Chopin et al., Paper VI 2008MNRAS.384.1597C 2008MNRAS.384.1597C
(End) Patricia Vannier [CDS] 10-Aug-2007