J/MNRAS/471/629 Bootes-HiZELS. Em-line galaxies at z=0.4-4.7 (Matthee+, 2017)
Bootes-HiZELS: an optical to near-infrared survey of emission-line galaxies at
z = 0.4-4.7.
Matthee J., Sobral D., Best P., Smail I., Bian F., Darvish B.,
Rottgering H., Fan X.
<Mon. Not. R. Astron. Soc., 471, 629-649 (2017)>
=2017MNRAS.471..629M 2017MNRAS.471..629M (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, IR ; Redshifts ; Photometry, infrared ; Optical
Keywords: galaxies: active - galaxies: evolution - galaxies: high-redshift -
galaxies: luminosity function, mass function -
galaxies: star formation
Abstract:
We present a sample of ∼1000 emission-line galaxies at z=0.4-4.7 from
the ∼0.7deg2 High-z Emission-Line Survey in the Bootes field
identified with a suite of six narrow-band filters at ~=0.4-2.1µm.
These galaxies have been selected on their Lyα (73), [OII]
(285), Hβ/[OIII] (387) or Hα (362) emission line, and have
been classified with optical to near-infrared colours. A subsample of
98 sources have reliable redshifts from multiple narrow-band (e.g.
[OII]-Hα) detections and/or spectroscopy. In this survey paper,
we present the observations, selection and catalogues of emitters. We
measure number densities of Lyα, [OII], Hβ/[OIII] and
Hα and confirm strong luminosity evolution in star-forming
galaxies from z∼0.4 to ∼5, in agreement with previous results. To
demonstrate the usefulness of dual-line emitters, we use the sample of
dual [OII]-Hα emitters to measure the observed [OII]/Hα
ratio at z=1.47. The observed [OII]/Hα ratio increases
significantly from 0.40±0.01 at z=0.1 to 0.52±0.05 at z=1.47,
which we attribute to either decreasing dust attenuation with
redshift, or due to a bias in the (typically) fibre measurements in
the local Universe that only measure the central kpc regions. At the
bright end, we find that both the Hα and Lyα number
densities at z~=2.2 deviate significantly from a Schechter form,
following a power law. We show that this is driven entirely by an
increasing X-ray/active galactic nucleus fraction with line
luminosity, which reaches ~=100 per cent at line luminosities
L≥3x1044erg/s.
Description:
Optical observations in two narrow-band filters (NB392, NB501), a
medium band filter (stV) and the g band were performed with the Wide
Field Camera (WFC) on the 2.5-m Isaac Newton Telescope, part of the
Roque de los Muchachos Observatory on the island of La Palma, Spain.
Near-infrared observations in H, NBH and NBK were performed with WFCAM
on the UK Infrared Telescope (UKIRT) on Mauna Kea as part of the
HiZELS .
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablec1.dat 93 42 List of sources that are observed as
dual-emitters (line-emitters in at least
two narrow-bands)
tabled1.dat 49 57 Catalogue of NB392 line-emitters
tabled2.dat 49 39 Catalogue of stV line-emitters
tabled3.dat 49 65 Catalogue of NB501 line-emitters
tabled4.dat 58 1161 Catalogue of NB921 line-emitters
tabled5.dat 55 301 Catalogue of NBH line-emitters
tabled6.dat 57 255 Catalogue of NBK line-emitters
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Byte-by-byte Description of file: tablec1.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 11 A11 --- ID Designation, B-HiZELS_NN
13- 19 F7.3 deg RAdeg Right ascension (J2000)
21- 27 F7.4 deg DEdeg Declination (J2000)
29- 32 F4.2 --- zdualNB dual-NB redshift
34- 37 F4.2 --- zsp ? Spectroscopic redshift
39- 42 F4.1 mag Imag I magnitude
44- 93 A50 --- Note list of emission lines that are detected.
X-ray- and LOFAR-detected sources are indicated
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Byte-by-byte Description of file: tabled1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
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1- 17 A17 --- ID Designation, B-HiZELSNB392NN
19- 25 F7.3 deg RAdeg Right ascension (J2000)
27- 33 F7.4 deg DEdeg Declination (J2000)
35- 38 F4.1 mag Imag ?=99 I magnitude
40- 43 F4.1 10-16mW/m2 Lineflux Line flux in NB392 (392nm) filter
45- 47 I3 0.1nm EW Observed equivalent width
49 I1 --- LAE-z2p2 [0/1] Class flag (1)
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Note (1): Class flag as follows:
0 = unclassed
1 = LAE at z=2.2
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Byte-by-byte Description of file: tabled2.dat
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Bytes Format Units Label Explanations
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1- 15 A15 --- ID Designation, B-HiZELSstVNN
17- 23 F7.3 deg RAdeg Right ascension (J2000)
25- 31 F7.4 deg DEdeg Declination (J2000)
33- 37 F5.1 10-19W/m2 lineflux Line flux in stV (410nm) filter
39- 42 I4 0.1nm EW Observed equivalent width
44- 47 F4.1 mag Imag I magnitude
49 I1 --- LAE-z2p4 [0/1] Class flag (1)
--------------------------------------------------------------------------------
Note (1): Class flag as follows:
0 = unclassed
1 = LAE at z=2.4
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Byte-by-byte Description of file: tabled3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
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1- 17 A17 --- ID Designation, B-HiZELSNB501NN
19- 25 F7.3 deg RAdeg Right ascension (J2000)
27- 33 F7.4 deg DEdeg Declination (J2000)
35- 38 F4.1 mag Imag ?=99 I magnitude
40- 43 F4.1 10-19W/m2 lineflux Line flux in NB501 (501nm) filter
45- 47 I3 0.1nm EW Observed equivalent width
49 I1 --- LAE-z3p1 [0/1] Class flag (1)
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Note (1): Class flag as follows:
0 = unclassed
1 = LAE at z=3.1
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Byte-by-byte Description of file: tabled4.dat
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Bytes Format Units Label Explanations
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1- 19 A19 --- ID Designation, B-HiZELSNB921NNNN
21- 27 F7.3 deg RAdeg Right ascension (J2000)
29- 35 F7.4 deg DEdeg Declination (J2000)
37- 40 F4.1 10-19W/m2 lineflux Line flux in NB921 (919nm) filter
42- 45 I4 0.1nm EW Observed equivalent width
47- 50 F4.1 mag Imag ?=99 I magnitude
52 I1 --- Unclassed [0/1] 1 for unclassed
54 I1 --- HA-z0p4 [0/1] 1 for Hα at z=0.4
56 I1 --- O3-z0p8 [0/1] 1 for Hβ/[OIII] at z=0.8
58 I1 --- O2-z1p47 [0/1] 1 for [OII] at z=1.47
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Byte-by-byte Description of file: tabled5.dat
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Bytes Format Units Label Explanations
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1- 16 A16 --- ID Designation, B-HiZELSNBHNNN
18- 24 F7.3 deg RAdeg Right ascension (J2000)
26- 32 F7.4 deg DEdeg Declination (J2000)
34- 37 F4.1 10-19W/m2 lineflux Line flux in NBH (1620nm) filter
39- 42 I4 0.1nm EW Observed equivalent width
44- 47 F4.1 mag Imag ?=99 I magnitude
49 I1 --- Unclassed [0/1] 1 for unclassed
51 I1 --- HA-z1p5 [0/1] 1 for Hα at z=1.47
53 I1 --- O3-z2p2 [0/1] 1 for Hβ/[OIII] at z=2.2
55 I1 --- O2-z3p3 [0/1] 1 for [OII] at z=3.3
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Byte-by-byte Description of file: tabled6.dat
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Bytes Format Units Label Explanations
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1- 16 A16 --- ID Designation, B-HiZELSNBKNNN
18- 24 F7.3 deg RAdeg Right ascension (J2000)
26- 32 F7.4 deg DEdeg Declination (J2000)
34- 37 F4.1 10-19W/m2 lineflux Line flux in NBK (2120nm) filter
39- 42 I4 0.1nm EW Observed equivalent width
44- 47 F4.1 mag Imag ?=99 I magnitude
49 I1 --- Unclassed [0/1] 1 for unclassed
51 I1 --- Lowz-sel [0/1] 1 for z<1
53 I1 --- HA-z2p2 [0/1] 1 for Hα at z=2.23
55 I1 --- O3-z3p3 [0/1] 1 for Hβ/[OIII] at z3.2
57 I1 --- O2-z4p7 [0/1] 1 for [OII] at z=4.7
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 15-May-2020