J/ApJ/865/L1   LAEs discovered with ultra-deep MUSE sp. in UDF   (Maseda+, 2018)
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MUSE spectroscopic identifications of ultra-faint emission line galaxies with
M_UV_~-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
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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 m_AB_>~30-32.
    Specifically, we detect objects via Ly{alpha} 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 Ly{alpha} emission as well as the 1216 {AA}
    breaks and faint ultraviolet continua (M_UV_~-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 Ly{alpha}
    emitters as a function of luminosity is consistent with these objects
    being the high-equivalent width tail of the normal Ly{alpha}-emitter
    population at these redshifts.

Description:
    We utilize the MUSE spectroscopic data set in the Hubble Ultra Deep
    Field, covering 9.92arcmin^2^ to 10hr depth and a single 1.15arcmin^2^
    subfield to 32hr depth; further details about the observations and
    data reduction are presented in Bacon+, 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
                             Ly{alpha} 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   : Ly{alpha} 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] Ly{alpha} flux;
                                         in 1e-20erg/s/cm^2^ 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 Ly{alpha} 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

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(End)                     Prepared by [AAS], Emmanuelle Perret [CDS] 24-Sep-2019