J/ApJ/751/29 Lyα profiles of LAEs at z=3.1 (Yamada+, 2012)
Profiles of Lyα emission lines of the emitters at z = 3.1.
Yamada T., Matsuda Y., Kousai K., Hayashino T., Morimoto N., Umemura M.
<Astrophys. J., 751, 29 (2012)>
=2012ApJ...751...29Y 2012ApJ...751...29Y (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, optical ; Redshifts ; Spectroscopy ; Magnitudes
Keywords: galaxies: evolution - galaxies: formation - galaxies: high-redshift -
galaxies: kinematics and dynamics - galaxies: star formation
Abstract:
We present the results of the observations of the Lyα line
profiles of 91 emission-line galaxies at z=3.1 with a spectral
resolution of λ/δλ(FWHM)~1700 or 180km/s. A
significant fraction of ∼50% of the observed objects show the
characteristic double peaks in their Lyα profile. The red peak
is much stronger than the blue one for most of the cases. The red
peaks themselves also show weak but significant asymmetry and their
widths are correlated with the velocity separation of the red and the
blue peaks. This implies that the peaks are not isolated multiple
components with different velocities but parts of a single line that
are modified by the absorption and/or scattering by the associated
neutral hydrogen gas. The characteristic profile can be naturally
explained by scattering in the expanding shell of the neutral hydrogen
surrounding the Lyα emitting region while the attenuation by the
intergalactic medium should also be considered. Our results suggest
that the star formation in these Lyα emitters are dominated by
young burst-like events that produce the intrinsic Lyα emission
as well as the gas outflow.
Description:
The sample of Lyα emitters (LAE) is selected based on the same
data presented in Hayashino et al. (2004AJ....128.2073H 2004AJ....128.2073H) and Yamada et
al. (2012AJ....143...79Y 2012AJ....143...79Y) at the field of SSA22-Sb1.
The observations of the Lyα profiles of the emitters are done by
the Faint Object Camera And Spectrograph (FOCAS) equipped with the
Subaru 8.2m telescope in 2004 July to 2005 August.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 73 91 Summary of the observed Lymanα emitters
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See also:
J/ApJ/744/110 : LAE galaxies between 2.1=<z≤3.1 (Ciardullo+, 2012)
J/ApJ/743/9 : z=3.1 LAEs morphological properties (Gronwall+, 2011)
J/ApJ/736/31 : HETDEX pilot survey. II. 1.9<z<3.8 LAEs (Blanc+, 2011)
J/ApJ/705/639 : Sizes of Lyman alpha emitters at z=3.1 (Bond+, 2009)
J/A+A/498/13 : Lyman-α emitters from redshifts z∼2-3 (Nilsson+, 2009)
J/ApJS/176/301 : Subaru/XMM-Newton deep survey IV. (SXDS) (Ouchi+, 2008)
J/PASJ/58/313 : Lyα emitters in the SUBARU Deep Field (Shimasaku+, 2006)
J/PASJ/57/165 : Lyα emitters in the SUBARU Deep Field (Taniguchi+, 2005)
J/PASJ/57/881 : Imaging of high-redshift Lyman alpha emitters (Yamada+, 2005)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- --- [LAE]
5- 20 A16 --- LAE Galaxy identification (JHHMMSS.s+DDMMSS);
<[YMK2012] LAE JHHMMSS.s+DDMMSS> in Simbad
22- 26 F5.3 --- ze [3/3.2] Redshift measured by the peak of the
strongest emission-line component
28- 33 F6.1 km/s FWHM [19/1998]?=0 FWHM of the strongest component
after correction for the instrumental profile (1)
35- 40 F6.1 0.1nm lam1 [4928/5006] The central wavelength of the red peak
in the multiple-component Gaussian fitting
42- 47 F6.1 0.1nm lam2 [4923/4992]?=0 The central wavelength of the blue
peak in the multiple-component Gaussian fitting
48 A1 --- u_lam2 Uncertainty flag on lam2
50- 55 F6.1 0.1nm lam0 [4928/5001] The central wavelength of peak in the
single-component Gaussian fitting
57- 61 F5.2 mag NBauto [22.4/25.6] AB magnitude in the NB497 narrowband
filter (MAG_AUTO)
63- 67 F5.2 mag NBap [22.4/25.7]?=0 AB aperture magnitude in the NB497
narrowband filter (2)
69- 73 F5.2 mag BVap [23.4/29]?=0 Effectively averaged AB aperture
magnitude of the B and the V band (2)
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Note (1): The zero value means that the line is not resolved.
Note (2): The aperture magnitude values are measured in the 2arcsec diameter
apertures.
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History:
From electronic version of the journal
(End) Emmanuelle Perret [CDS] 16-Dec-2013