J/ApJ/707/1779 BLAST: the redshift survey (Eales+, 2009)
BLAST: the redshift survey.
Eales S., Chapin E.L., Devlin M.J., Dye S., Halpern M., Hughes D.H.,
Marsden G., Mauskopf P., Moncelsi L., Netterfield C.B., Pascale E.,
Patanchon G., Raymond G., Rex M., Scott D., Semisch C., Siana B.,
Truch M.D.P., Viero M.P.
<Astrophys. J., 707, 1779-1808 (2009)>
=2009ApJ...707.1779E 2009ApJ...707.1779E
ADC_Keywords: Surveys ; Cross identifications ; Redshifts ; Spectroscopy ;
Millimetric/submm sources
Keywords: galaxies: evolution - galaxies: high-redshift - submillimeter -
surveys
Abstract:
The Balloon-borne Large Aperture Submillimeter Telescope (BLAST) has
recently surveyed ∼8.7deg2 centered on Great Observatories Origins
Deep Survey-South at 250, 350, and 500um. In Dye et al. (2009, Cat.
J/ApJ/703/285), we presented the catalog of sources detected at
5σ in at least one band in this field and the probable
counterparts to these sources in other wavebands. In this paper, we
present the results of a redshift survey in which we succeeded in
measuring redshifts for 82 of these counterparts. The spectra show
that the BLAST counterparts are mostly star-forming galaxies but not
extreme ones when compared to those found in the Sloan Digital Sky
Survey. Roughly one quarter of the BLAST counterparts contain an
active nucleus. We have also investigated the cases where there are
two possible counterparts to the BLAST source, finding that in at
least half of these there is evidence that the two galaxies are
physically associated, either because they are interacting or because
they are in the same large-scale structure. Finally, we have made the
first direct measurements of the luminosity function in the three
BLAST bands.
Description:
This paper represents a continuation of the work described in Dye et
al. (2009, Cat. J/ApJ/703/285). We present the results of a redshift
survey of the counterparts to the BLAST sources with the AAOmega
multi-object spectrometer on the Anglo-Australian Telescope, on 2008
November 24.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 113 69 Secondary radio and 24um counterparts to
5σ BLAST sources
table2.dat 82 82 Spectroscopic redshifts for the BLAST counterparts
table3.dat 27 317 Spectroscopic redshifts for the other targets
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See also:
II/253 : Chandra Deep Field South: multi-colour data (Wolf+, 2008)
II/290 : SWIRE Photometric Redshift Catalogue (Rowan-Robinson+, 2008)
J/ApJS/191/222 : BLAST observations of the SEP field (Valiante+, 2010)
J/ApJ/703/285 : Radio and 24um BLAST counterparts in CDFS (Dye+, 2009)
J/ApJ/681/428 : BLAST sources in Galactic plane survey (Chapin+, 2008)
J/ApJS/179/71 : VLA survey of the CDF-S I. (Kellermann+, 2008)
J/AJ/132/2409 : Deep ATLAS radio observations of CDFS (Norris+, 2006)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- [DAB2009] Internal source number
5- 9 A5 --- --- [BLAST]
11- 24 A14 --- BLAST Official BLAST identification (JHHMMSS+DDMMSS)
26- 33 F8.5 deg RAdeg ? Radio right ascension in decimal degrees
(J2000)
35- 43 F9.5 deg DEdeg ? Radio declination in decimal degrees (J2000)
45- 48 F4.2 mJy Frad ? Flux density at 1.4GHz
50- 56 F7.5 --- Prad ? Probability radio counterpart being chance
alignment
58- 62 F5.2 arcsec off ? Radio radial offset
64- 71 F8.5 deg RA24deg ? 24um right ascension in decimal degrees
(J2000)
73- 81 F9.5 deg DE24deg ? 24um declination in decimal degrees (J2000)
83- 87 F5.3 mJy F24 ? Flux density at 24 microns
89- 95 F7.5 --- P24 ? Probability 24 micron source counterpart
being chance alignment
97-101 F5.2 arcsec 24off ? 24um radial offset
103-107 F5.3 --- zRR ? Rowan-Robinsonn et al. (2009, Cat. II/290)
photometric redshift
109-113 F5.3 --- z17 ? COMBO-17 (Wolf et al., 2004, Cat. II/253)
photometric redshift
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- [DAB2009] Internal source number
4 A1 --- f_[DAB2009] [a] Note on object (1)
6- 10 A5 --- --- [BLAST]
12- 25 A14 --- BLAST Official BLAST identification (JHHMMSS+DDMMSS)
27 I1 --- C [1/2] Number indicating whether the counterpart
is a primary or a secondary one (2)
29- 36 F8.5 deg RAdeg Counterpart right ascension in decimal degrees
(J2000) (3)
38- 46 F9.5 deg DEdeg Counterpart declination in decimal degrees
(J2000) (3)
48- 53 F6.4 --- zsp Spectroscopic redshift
55 I1 --- q_zsp [3,5] Redshift quality (G1)
57- 58 I2 0.1nm EW ? Hα equivalent width in the rest frame
60- 63 F4.2 --- [NII]/Ha ? Ratio of the flux in the [NII]658.3 line to
the flux in the Hα line
65- 82 A18 --- OType Object type (4)
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Note (1):
a = The radio/24um counterparts for this source fall within the same galaxy
visible on the optical image (Section 4.3), and so these redshifts are
effectively independent measurements for the same galaxy.
Note (2): The counterparts are mostly the primary counterparts ("1"; from
Cat. J/ApJ/703/285), but nine are the secondary counterparts ("2";
from table 1 of this paper). See section 2 for further details.
Note (3): In order of preference, a radio, optical or IRAC 3.5um position.
Note (4): A comment on whether there is any evidence from the line ratios
or the width of the lines that the galaxy contains an AGN or a Quasar
(see Section 4.1 for details).
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 8 F8.5 deg RAdeg Right Ascension in decimal degrees (J2000) (1)
10- 18 F9.5 deg DEdeg Declination in decimal degrees (J2000) (1)
20- 25 F6.4 --- zsp Spectroscopic redshift
27 I1 --- q_zsp [3,5] Quality in z (G1)
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Note (1): The position of the fiber on the sky.
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Global notes:
Note (G1): Code quality as follows:
5 = the redshift is certain;
4 = the redshift is almost certain, approximately a 95% of being correct;
3 = the redshift is somewhat less certain but still probably correct.
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Nomenclature notes:
Table 3: sources are <[ECD2009] DD.ddddd+DD.ddddd> in Simbad.
History:
From electronic version of the journal
References:
Dye et al. BLAST counterparts. 2009ApJ...703..285D 2009ApJ...703..285D Cat. J/ApJ/703/285
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 12-Oct-2011