J/ApJ/705/639 Sizes of Lyman alpha emitters at z=3.1 (Bond+, 2009)
Sizes of Lyα-emitting galaxies and their rest-frame ultraviolet components
at z = 3.1.
Bond N.A., Gawiser E., Gronwall C., Ciardullo R., Altmann M., Schawinski K.
<Astrophys. J., 705, 639-649 (2009)>
=2009ApJ...705..639B 2009ApJ...705..639B
ADC_Keywords: Galaxies, photometry ; Surveys
Keywords: cosmology: observations - galaxies: formation -
galaxies: high-redshift - galaxies: structure
Abstract:
We present a rest-frame ultraviolet analysis of ∼120 z∼3.1 Lyman Alpha
Emitters (LAEs) in the Extended Chandra Deep Field South. Using Hubble
Space Telescope (HST) images taken as part of the Galaxy Evolution
From Morphology and SEDS (GEMS) survey, Great Observatories Origins
Deep Survey (GOODS), and Hubble Ultradeep Field surveys, we analyze
the sizes of LAEs, as well as the spatial distribution of their
components, which are defined as distinct clumps of UV-continuum
emission. We set an upper limit of ∼1kpc (∼0.1") on the rms offset
between the centroids of the continuum and Lyα emission. Most of
the multi-component LAEs identified in shallow frames become connected
in deeper images, suggesting that the majority of the rest-UV "clumps"
are individual star-forming regions within a single system.
Description:
This paper complements the Gronwall et al. (2007, Cat. J/ApJ/667/79)
and Gawiser et al. (2007ApJ...671..278G 2007ApJ...671..278G) studies of the MUSYC z=3.1
LAE sample by measuring the rest-UV size and component distributions
using high-resolution V-band images, taken by the Advanced Camera for
Surveys (ACS) and obtained as part of the Galaxy Evolution from
Morphology and SEDs survey (GEMS; Rix et al. 2004ApJS..152..163R 2004ApJS..152..163R),
Great Observatories Origins Deep Survey (GOODS; Giavalisco et al.
2004, Cat. II/261), and Hubble Ultradeep Field survey (HUDF; Beckwith
et al. 2006, Cat. J/AJ/132/1729).
File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table2.dat 56 128 LAE photometric properties in GEMS
(Galaxy Evolution from Morphology and SEDs)
table3.dat 75 128 LAE component photometric properties
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See also:
II/261 : GOODS initial results (Giavalisco+, 2004)
J/A+A/498/13 : Lyman-α emitters from redshifts z∼2-3 (Nilsson+, 2009)
J/ApJS/172/615 : GALFIT result for GEMS galaxies (Haussler+, 2007)
J/ApJ/667/79 : Lyα emission-line galaxies at z=3.1 (Gronwall+, 2007)
J/AJ/132/1729 : Hubble Ultra Deep Field BVI-dropout sources (Beckwith+, 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: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 I3 --- [GCH2007] [4/162] Index number (1)
5- 9 A5 --- Survey Survey name (GEMS, GOODS or HUDF)
11 I1 h RAh Hour of Right Ascension (J2000) (2)
13- 14 I2 min RAm Minute of Right Ascension (J2000) (2)
16- 21 F6.3 s RAs Second of Right Ascension (J2000) (2)
23 A1 --- DE- Sign of the Declination (J2000)(2)
24- 25 I2 deg DEd Degree of Declination (J2000) (2)
27- 28 I2 arcmin DEm Arcminute of Declination (J2000) (2)
30- 35 F6.3 arcsec DEs Arcsecond of Declination (J2000) (2)
37- 41 F5.2 mag Vmag ? PHOT-computed V-band AB magnitude
43- 46 F4.2 mag e_Vmag ? Uncertainty in Vmag
48- 51 F4.2 arcsec dc ? ACS/ground-based centroid distance
53- 56 F4.2 arcsec re ? PHOT-computed half-light radius (3)
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Note (1): From Table 2 in Gronwall et al. 2007, Cat. J/ApJ/667/79
Note (2): Position of ACS centroid (set to ground-based position when there are
no SExtractor detections).
Note (3): Not reported for LAEs without SExtractor detections.
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Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 I3 --- [GCH2007] [4/162] Index number
5 I1 --- m_[GCH2007] Component number
7- 11 A5 --- Survey Survey name (GEMS, GOODS or HUDF)
13 I1 h RAh Hour of Right Ascension (J2000)
15- 16 I2 min RAm Minute of Right Ascension (J2000)
18- 23 F6.3 s RAs Second of Right Ascension (J2000)
25 A1 --- DE- Sign of the Declination (J2000)
26- 27 I2 deg DEd Degree of Declination (J2000)
29- 30 I2 arcmin DEm Arcminute of Declination (J2000)
32- 37 F6.3 arcsec DEs Arcsecond of Declination (J2000)
39- 43 F5.2 mag Vmag SExtractor computed V-band AB magnitude
45- 48 F4.2 mag e_Vmag Uncertainty in Vmag
50- 53 F4.2 arcsec dc Distance from ground-based Lyα position
55- 58 F4.2 --- b/a SExtractor-computed isophotal axis ratio
60- 65 F6.2 deg theta SExtractor-computed isophotal position angle
67- 70 F4.2 arcsec reSE SExtractor-computed half-light radius
72- 75 F4.2 Msun/yr SFR UV-derived star formation rate
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History:
From electronic version of the journal
References:
Gronwall et al. Paper II. 2011ApJ...743....9G 2011ApJ...743....9G Cat. J/ApJ/743/9
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 02-Dec-2011