J/MNRAS/478/3740 High-z LAEs and LBGs in SHARDS survey (Arrabal Haro+, 2018)
A simultaneous search for high-z LAEs and LBGs in the SHARDS survey.
Arrabal Haro P., Rodriguez Espinosa J.M., Munoz-Tunon C.,
Perez-Gonzalez P.G., Dannerbauer H., Bongiovanni A., Barro G., Cava A.,
Lumbreras-Calle A., Hernan-Caballero A., Eliche-Moral M.C.,
Dominguez Sanchez H., Conselice C.J., Tresse L., Alcalde Pampliega B.,
Balcells M., Daddi E., Rodighiero G.
<Mon. Not. R. Astron. Soc., 478, 3740-3755 (2018)>
=2018MNRAS.478.3740A 2018MNRAS.478.3740A (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies ; Redshifts ; Ultraviolet ; Equivalent widths
Keywords: galaxies: distances and redshifts - galaxies: evolution -
galaxies: groups: general - galaxies: high-redshift -
galaxies: star formation
Abstract:
We have undertaken a comprehensive search for both Lyman alpha
emitters (LAEs) and Lyman break galaxies (LBGs) in the Survey for
High-z Absorption Red and Dead Sources (SHARDS) Survey of the Great
Observatories Origins Deep Survey North field. SHARDS is a deep
imaging survey, made with the 10.4m Gran Telescopio Canarias,
employing 25 medium band filters in the range from 500 to 941nm. This
is the first time that both LAEs and LBGs are surveyed simultaneously
in a systematic way in a large field. We draw a sample of 1558
sources; 528 of them are LAEs. Most of the sources (1434) show
rest-frame UV continua. A minority of them (124) are pure LAEs with
virtually no continuum detected in SHARDS. We study these sources from
z∼3.35 up to z∼6.8, well into the epoch of reionization. Note that
surveys done with just one or two narrow band filters lack the
possibility to spot the rest-frame UV continuum present in most of our
LAEs. We derive redshifts, star formation rates, Lyα equivalent
widths, and luminosity functions (LFs). Grouping within our sample is
also studied, finding 92 pairs or small groups of galaxies at the same
redshift separated by less than 60 comoving kpc. In addition, we
relate 87 and 55 UV-selected objects with two known overdensities at
z=4.05 and z=5.198, respectively. Finally, we show that surveys made
with broad-band filters are prone to introduce many unwanted sources
(∼20 per cent interlopers), which means that previous studies may be
overestimating the calculated LFs, specially at the faint end.
Description:
SHARDS is an ESO/GTC deep optical spectro-photometric survey of the
GOODS-N field acquired with 200h of observing time with the OSIRIS
instrument on the 10.4m Gran Telescopio Canarias (GTC). The surveyed
area is ∼130arcmin2, split into two pointings. This survey
provides very deep photometry (m≲26.5-27.0 ABmag, at the 3σ
level) in 25 medium-band filters, from 500 to 941nm. The first 22
filters have ∼17nm FWHM, while the last three have an FWHM (full
width at half-maximum) of 35, 25, and 33nm, respectively.
We have used the SHARDS survey to carry out a search of high-z
galaxies. The narrow/medium width of the 25 SHARDS filters and their
completeness in the 500-941nm wavelength range have allowed us to
develop very precise SEDs in the optical/NIR. We have therefore
sampled the high-z galaxy population from z∼3.35 to z∼6.8 in a
uniform way.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 103 1558 Main relevant parameters of the sample
table2.dat 68 202 Distances between the objects in groups and
their redshifts
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 14 A14 --- Name Name of the object using the SHARDS
identification, SHARDSNNNNNNNN
17- 18 I2 h RAh Right ascension (J2000)
20- 21 I2 min RAm Right ascension (J2000)
23- 27 F5.2 s RAs Right ascension (J2000)
29 A1 --- DE- Declination sign (J2000)
30- 31 I2 deg DEd Declination (J2000)
33- 34 I2 arcmin DEm Declination (J2000)
36- 40 F5.2 arcsec DEs Declination (J2000)
43- 46 F4.2 --- z Redshift
48- 51 F4.2 --- e_z Redshift error
54- 56 F3.1 10+35W LLya ?=- Lyman alpha luminosity
(in 1042erg/s unit)
58- 60 F3.1 10+35W e_LLya ?=- Lyman alpha luminosity error
(in 1042erg/s unit)
63- 66 F4.1 mag m1500 ?=- Apparent magnitude at 1500Å
rest-frame (AB mag)
68- 70 F3.1 mag e_m1500 ?=- Apparent magnitude at 1500Å
rest-frame error (AB mag)
73- 75 F3.1 Msun/yr SFRLya ?=- SFR derived from the Lyman alpha
emission
77- 79 F3.1 Msun/yr e_SFRLya ?=- SFR error derived from the Lyman alpha
emission
82- 87 F6.1 Msun/yr SFRL1500 ?=- SFR derived from the rest-frame UV
continuum at 1500Å
89- 94 F6.1 Msun/yr e_SFRL1500 ?=- SFR error derived from the rest-frame UV
continuum at 1500Å
97- 99 I3 0.1nm EW ?=- Rest-frame EW (in Å)
101-103 I3 0.1nm e_EW ?=- Rest-frame EW error (in Å)
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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 A3 --- Group Identification name of the group.
6- 19 A14 --- Name Name of the object using the SHARDS
identification, SHARDSNNNNNNNN
22- 23 I2 h RAh Right ascension (J2000)
25- 26 I2 min RAm Right ascension (J2000)
28- 32 F5.2 s RAs Right ascension (J2000)
34 A1 --- DE- Declination sign (J2000)
35- 36 I2 deg DEd Declination (J2000)
38- 39 I2 arcmin DEm Declination (J2000)
41- 45 F5.2 arcsec DEs Declination (J2000)
48- 52 F5.2 kpc Dist Separation distance between members of the
group (comoving kpc) (1)
54- 57 F4.2 kpc e_Dist Separation distance error (comoving kpc)
60- 63 F4.2 --- z Redshift
65- 68 F4.2 --- e_z Redshift error
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Note (1): In case of more than two objects in a group, the distance shown is
the largest between the central object and the rest.
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 20-Sep-2021