J/ApJ/865/L1 LAEs discovered with ultra-deep MUSE sp. in UDF (Maseda+, 2018)
MUSE spectroscopic identifications of ultra-faint emission line galaxies with
MUV~-15.
Maseda M.V., Bacon R., Franx M., Brinchmann J., Schaye J., Boogaard L.A.,
Bouche N., Bouwens R.J., Cantalupo S., Contini T., Hashimoto T., Inami H.,
Marino R.A., Muzahid S., Nanayakkara T., Richard J., Schmidt K.B.,
Verhamme A., Wisotzki L.
<Astrophys. J., 865, L1 (2018)>
=2018ApJ...865L...1M 2018ApJ...865L...1M
ADC_Keywords: Galaxies, spectra; Redshifts; Ultraviolet; Optical
Keywords: galaxies: evolution; galaxies: high-redshift; quasars: emission lines
Abstract:
Using an ultra-deep blind survey with the MUSE integral field
spectrograph on the European Southern Observatory Very Large
Telescope, we obtain spectroscopic redshifts to a depth never before
explored: galaxies with observed magnitudes mAB≳30-32.
Specifically, we detect objects via Lyα emission at 2.9<z<6.7
without individual continuum counterparts in areas covered by the
deepest optical/near-infrared imaging taken by the Hubble Space
Telescope, the Hubble Ultra Deep Field. In total, we find 102 such
objects in 9 square arcminutes at these redshifts. Detailed stacking
analyses confirm the Lyα emission as well as the 1216 Å
breaks and faint ultraviolet continua (MUV~-15). This makes them the
faintest spectroscopically confirmed objects at these redshifts,
similar to the sources believed to reionize the universe. A simple
model for the expected fraction of detected/undetected Lyα
emitters as a function of luminosity is consistent with these objects
being the high-equivalent width tail of the normal Lyα-emitter
population at these redshifts.
Description:
We utilize the MUSE spectroscopic data set in the Hubble Ultra Deep
Field, covering 9.92arcmin2 to 10hr depth and a single 1.15arcmin2
subfield to 32hr depth; further details about the observations and
data reduction are presented in Bacon+, 2017A&A...608A...1B 2017A&A...608A...1B
The HUDF was observed over eight GTO runs over two years: September,
October, November and December 2014, August, September, October, and
December 2015 and February 2016.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 80 102 Properties of HST-undetected MUSE
Lyα emitters (LAEs)
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See also:
VI/109 : Population Synthesis Models at very low metallicities (Schaerer, 2003)
II/258 : Hubble Ultra Deep Field Catalog (UDF) (STScI, 2004)
J/ApJS/173/185 : GALEX ultraviolet atlas of nearby galaxies (Gil de Paz+, 2007)
J/ApJ/667/79 : Lyα emission-line galaxies at z=3.1 (Gronwall+, 2007)
J/ApJS/176/301 : Subaru/XMM-Newton deep survey IV. (SXDS) (Ouchi+, 2008)
J/A+A/523/A64 : UV properties of starbursts (Raiter+, 2010)
J/ApJ/772/48 : Emission-line galaxies from PEARS. II. (Pirzkal+, 2013)
J/A+A/575/A75 : MUSE 3D view of HDF-S (Bacon+, 2015)
J/ApJ/803/34 : z∼4-10 galaxies from HST legacy fields (Bouwens+, 2015)
J/AJ/150/31 : Photom. & redshifts of galaxies in the UDF (Rafelski+, 2015)
J/ApJS/219/15 : Morphologies of z=0-10 galaxies with HST data (Shibuya+, 2015)
J/A+A/608/A2 : MUSE Hubble Ultra Deep Field Survey. II. (Inami+, 2017)
J/A+A/608/A8 : MUSE Hubble Ultra Deep Field Survey. VIII (Leclercq+, 2017)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- [IBB2017] [6316/7395] MUSE identifier
6- 13 F8.5 deg RAdeg [53.13/53.2] Right Ascension (J2000)
15- 23 F9.5 deg DEdeg [-27.9/-27.7] Declination (J2000)
25- 29 F5.3 --- z [2.9/6.6] Spectroscopic redshift
31- 36 F6.1 1-20mW/m2 Lya [74/1980] Lyα flux;
in 1e-20erg/s/cm2 units
38- 42 F5.2 1-20mW/m2 e_Lya [6/87] Uncertainty in Lya
44- 48 F5.2 [10-7W] logLLya [41/42.3] log Lyα luminosity;
in erg/s units
50- 57 F8.6 [10-7W] e_logLLya [0.007/0.2] Uncertainty in logLLya
59- 65 F7.4 --- S/N-F435W [-1.8/1.5] HST F435W filter
Signal-to-Noise value
67- 72 F6.3 --- S/N-F606W [-1.9/5] HST F606W filter
Signal-to-Noise value
74- 80 F7.4 --- S/N-F775W [-2/5] HST F775W filter
Signal-to-Noise value
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 24-Sep-2019