J/MNRAS/465/316 Lyman continuum LAEs and LBGs in SSA22 field (Micheva+, 2017)
Searching for candidates of Lyman continuum sources -
revisiting the SSA22 field.
Micheva G., Iwata I., Inoue A.K., Matsuda Y., Yamada T., Hayashino T.
<Mon. Not. R. Astron. Soc., 465, 316-336 (2017)>
=2017MNRAS.465..316M 2017MNRAS.465..316M (SIMBAD/NED BibCode)
ADC_Keywords: Galaxy catalogs ; Galaxies, peculiar ; Redshifts ;
Photometry, infrared ; Photometry, UBVRI ; Photometry, SDSS
Keywords: galaxies: evolution - galaxies: high-redshift - intergalactic medium -
cosmology: observations - diffuse radiation
Abstract:
We present the largest to date sample of hydrogen Lyman continuum
(LyC) emitting galaxy candidates at any redshift, with 18 Lyman
α emitters (LAEs) and seven Lyman break galaxies (LBGs),
obtained from the SSA22 field with Subaru/Suprime-Cam. The sample is
based on the 159 LAEs and 136 LBGs observed in the field, all with
spectroscopically confirmed redshifts, and these LyC candidates are
selected as galaxies with counterparts in a narrow-band filter image
which traces LyC at z≥3.06. Many LyC candidates show a spatial
offset between the rest-frame non-ionizing ultraviolet (UV) detection
and the LyC-emitting substructure or between the Lyα emission
and LyC. The possibility of foreground contamination complicates the
analysis of the nature of LyC emitters, although statistically it is
highly unlikely that all candidates in our sample are contaminated by
foreground sources. Many viable LyC LAE candidates have flux density
ratios inconsistent with standard models, while also having too blue
UV slopes to be foreground contaminants. Stacking reveals no
significant LyC detection, suggesting that there is a dearth of
objects with marginal LyC signal strength, perhaps due to a bimodality
in the LyC emission. The foreground contamination corrected 3σ
upper limits of the observed average flux density ratios are fLyC/fUV
< 0.08 from stacking LAEs and fLyC/fUV<0.02 from stacking LBGs.
There is a sign of a positive correlation between LyC and Lyα,
suggesting that both types of photons escape via a similar mechanism.
The LyC detection rate among protocluster LBGs is seemingly lower
compared to the field.
Description:
The data we use in our analysis have been previously compiled and
published (Hayashino et al., 2004AJ....128.2073H 2004AJ....128.2073H; Iwata et al.,
2009ApJ...692.1287I 2009ApJ...692.1287I; Nakamura et al., 2011MNRAS.412.2579N 2011MNRAS.412.2579N). While two
of those studies concentrate on the search for high-redshift Lyα
emitters in the direction of the SSA22 field, Iwata et al.
(2009ApJ...692.1287I 2009ApJ...692.1287I) perform an analysis similar to ours, using the
same set of filters. Our reanalysis, however, utilizes the deeper
available data from Nakamura et al. (2011MNRAS.412.2579N 2011MNRAS.412.2579N) and improved
astrometry in the NB359 filter, resulting in a larger LyC candidate
sample. The astrometric uncertainty in the NB359 band is now
∼0.2arcsec.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
lyc.dat 332 25 LyC Catalog (confirmed foreground contaminants
not included, AGN not included)
nonlyc.dat 178 265 Non-LyC catalog
(LAEs and LBGs at redshift z≥3.06)
--------------------------------------------------------------------------------
See also:
J/MNRAS/465/302 : Lyman continuum leaking AGN in SSA22 field (Micheva+, 2017)
Byte-by-byte Description of file: lyc.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 I2 --- Seq Running number (number)
4- 8 A5 --- Name Primary ID of LyC object (primary_id0)
10- 29 A20 --- NED NED name of LyC object (ned_id0)
31- 41 F11.7 deg RAdeg Radio right ascension (J2000) (ra_r)
43- 51 F9.7 deg DEdeg Radio declination (J2000) (dc_r)
53- 57 F5.3 --- z Spectroscopic redshift (redshift)
59- 62 F4.2 arcsec FWHM R band FWHM (r_modelFWHM)
64- 68 F5.2 mag N3mag ? growth curve total AB mag in NB359
(n3_modelmag)
70- 73 F4.2 mag e_N3mag ? growth curve total AB mag error in NB359
(n3_modelmagerr)
75- 79 F5.2 mag Bmag growth curve total AB mag in B (b_modelmag)
81- 84 F4.2 mag e_Bmag growth curve total AB mag error in B
(b_modelmagerr)
86- 90 F5.2 mag N4mag ? growth curve total AB mag in NB497
(n4_modelmag)
92- 95 F4.2 mag e_N4mag ? growth curve total AB mag error in NB497
(n4_modelmagerr)
97-101 F5.2 mag Vmag growth curve total AB mag in V (v_modelmag)
103-106 F4.2 mag e_Vmag growth curve total AB mag error in V
(v_modelmagerr)
108-112 F5.2 mag Rmag growth curve total AB mag in R (r_modelmag)
114-117 F4.2 mag e_Rmag growth curve total AB mag error in R
(r_modelmagerr)
119-123 F5.2 mag i'mag growth curve total AB mag in i' (i_modelmag)
125-128 F4.2 mag e_i'mag growth curve total AB mag error in i'
(i_modelmagerr)
130-134 F5.2 mag z'mag growth curve total AB mag in z' (z_modelmag)
136-139 F4.2 mag e_z'mag growth curve total AB mag error in z'
(z_modelmagerr)
141-145 F5.2 mag N3magapR ? diameter=1.2 arcsec aperture AB mag in
NB359 at R band position (n3ap12r_mag)
147-150 F4.2 mag e_N3magapR ? diameter=1.2 arcsec aperture AB mag error
in NB359 at R band position
(n3ap12r_magerr)
152-156 F5.2 mag BmagapR diameter=1.2 arcsec aperture AB mag in B at R
band position (bap12r_mag)
158-161 F4.2 mag e_BmagapR diameter=1.2 arcsec aperture AB mag error in
B at R band position (bap12r_magerr)
163-167 F5.2 mag N4magapR ? diameter=1.2 arcsec aperture AB mag in
NB497 at R band position (n4ap12r_mag)
169-172 F4.2 mag e_N4magapR ? diameter=1.2 arcsec aperture AB mag error
in NB497 at R band position
(n4ap12r_magerr)
174-178 F5.2 mag VmagapR diameter=1.2 arcsec aperture AB mag in V
at R band position (vap12r_mag)
180-183 F4.2 mag e_VmagapR diameter=1.2 arcsec aperture AB mag error in
V at R band position (vap12r_magerr)
185-189 F5.2 mag RmagapR diameter=1.2 arcsec aperture AB mag in R
at R band position (rap12r_mag)
191-194 F4.2 mag e_RmagapR diameter=1.2 arcsec aperture AB mag error in
R at R band position (rap12r_magerr)
196-200 F5.2 mag i'magapR diameter=1.2 arcsec aperture AB mag in i'
at R band position (iap12r_mag)
202-205 F4.2 mag e_i'magapR diameter=1.2 arcsec aperture AB mag error in
i' at R band position (iap12r_magerr)
207-211 F5.2 mag z'magapR diameter=1.2 arcsec aperture AB mag in z'
at R band position (zap12r_mag)
213-216 F4.2 mag e_z'magapR diameter=1.2 arcsec aperture AB mag error in
z' at R band position (zap12r_magerr)
218-222 F5.2 mag N3magapN3 diameter=1.2 arcsec aperture AB mag in NB359
at NB359 band position (n3ap12n3_mag)
224-227 F4.2 mag e_N3magapN3 diameter=1.2 arcsec aperture AB mag error in
NB359 at NB359 band position
(n3ap12n3_magerr)
229-233 F5.2 mag BmagapN3 diameter=1.2 arcsec aperture AB mag in B
at NB359 band position (bap12n3_mag)
235-238 F4.2 mag e_BmagapN3 diameter=1.2 arcsec aperture AB mag error in
B at NB359 band position (bap12n3_magerr)
240-244 F5.2 mag N4magapN3 ? diameter=1.2 arcsec aperture AB mag in
NB497 at NB359 band position
(n4ap12n3_mag)
246-249 F4.2 mag e_N4magapN3 ? diameter=1.2 arcsec aperture AB mag error
in NB497 at NB359 band position
(n4ap12n3_magerr)
251-255 F5.2 mag VmagapN3 diameter=1.2 arcsec aperture AB mag in V
at NB359 band position (vap12n3_mag)
257-260 F4.2 mag e_VmagapN3 diameter=1.2 arcsec aperture AB mag error in
V at NB359 band position (vap12n3_magerr)
262-266 F5.2 mag RmagapN3 diameter=1.2 arcsec aperture AB mag in R
at NB359 band position (rap12n3_mag)
268-271 F4.2 mag e_RmagapN3 diameter=1.2 arcsec aperture AB mag error in
R at NB359 band position (rap12n3_magerr)
273-277 F5.2 mag i'magapN3 ? diameter=1.2 arcsec aperture AB mag in i'
at NB359 band position (iap12n3_mag)
279-282 F4.2 mag e_i'magapN3 ? diameter=1.2 arcsec aperture AB mag error
in i' at NB359 band position
(iap12n3_magerr)
284-288 F5.2 mag z'magapN3 ? diameter=1.2 arcsec aperture AB mag in z'
at NB359 band position (zap12n3_mag)
290-293 F4.2 mag e_z'magapN3 ? diameter=1.2 arcsec aperture AB mag error
in z' at NB359 band position
(zap12n3_magerr)
295-299 F5.2 arcsec OffX359B x offset NB359 ←> R in arcsec (offx359r)
301-305 F5.2 arcsec OffY359R y offset NB359 ←> R in arcsec (offy359r)
307-311 F5.2 arcsec OffX497R ? x offset NB497 ←> R in arcsec (offx497r)
313-317 F5.2 arcsec OffY497R ? y offset NB497 ←> R in arcsec (offy497r)
319-322 F4.2 arcsec OffX497BVR ? x offset (NB497-BV) ←> NB359 in arcsec
(offx497bv_r)
324-327 F4.2 arcsec OffY497BVR ? y offset (NB497-BV) ←> NB359 in arcsec
(offy497bv_r)
329-332 F4.2 mag AV Galactic Extinction using IRSA
(Av_SandF) (G1)
--------------------------------------------------------------------------------
Byte-by-byte Description of file: nonlyc.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 I4 --- Seq Running number (number)
6- 8 A3 --- Type Galaxy type (gal_type)
10- 20 F11.7 deg RAdeg Right ascension (J2000) (ra_r)
22- 30 F9.7 deg DEdeg Delcination (J2000) (dc_r)
32- 36 F5.3 --- z Spectroscopic redshift (redshift)
38- 41 F4.2 arcsec FWHM R band FWHM (r_modelFWHM)
43- 47 F5.2 mag Bmag ? growth curve total AB mag in B (b_modelmag)
49- 52 F4.2 mag e_Bmag ? growth curve total AB mag error in B
(b_modelmagerr)
54- 58 F5.2 mag N4mag ? growth curve total AB mag in NB497
(n4_modelmag)
60- 63 F4.2 mag e_N4mag ? growth curve total AB mag error in NB497
(n4_modelmagerr)
65- 69 F5.2 mag Vmag growth curve total AB mag in V (v_modelmag)
71- 74 F4.2 mag e_Vmag growth curve total AB mag error in V
(v_modelmagerr)
76- 80 F5.2 mag Rmag growth curve total AB mag in R (r_modelmag)
82- 85 F4.2 mag e_Rmag growth curve total AB mag error in R
(r_modelmagerr)
87- 91 F5.2 mag i'mag growth curve total AB mag in i' (i_modelmag)
93- 96 F4.2 mag e_i'mag growth curve total AB mag error in i'
(i_modelmagerr)
98-102 F5.2 mag z'mag ? growth curve total AB mag in z' (z_modelmag)
104-107 F4.2 mag e_z'mag ? growth curve total AB mag error in z'
(z_modelmagerr)
109-113 F5.2 mag BmagapR ? diameter=1.2 arcsec aperture AB mag in B
at R band position (bap12r_mag)
115-118 F4.2 mag e_BmagapR ? diameter=1.2 arcsec aperture AB mag error in
B at R band position (bap12r_magerr)
120-124 F5.2 mag N4magapR ? diameter=1.2 arcsec aperture AB mag in NB497
at R band position (n4ap12r_mag)
126-129 F4.2 mag e_N4magapR ? diameter=1.2 arcsec aperture AB mag error in
NB497 at R band position (n4ap12r_magerr)
131-135 F5.2 mag VmagapR diameter=1.2 arcsec aperture AB mag in V
at R band position (vap12r_mag)
137-140 F4.2 mag e_VmagapR diameter=1.2 arcsec aperture AB mag error in V
at R band position (vap12r_magerr)
142-146 F5.2 mag RmagapR diameter=1.2 arcsec aperture AB mag in R
at R band position (rap12r_mag)
148-151 F4.2 mag e_RmagapR diameter=1.2 arcsec aperture AB mag error in R
at R band position (rap12r_magerr)
153-157 F5.2 mag i'magapR ? diameter=1.2 arcsec aperture AB mag in i'
at R band position (iap12r_mag)
159-162 F4.2 mag e_i'magapR ? diameter=1.2 arcsec aperture AB mag error in
i' at R band position (iap12r_magerr)
164-168 F5.2 mag z'magapR ? diameter=1.2 arcsec aperture AB mag in z'
at R band position (zap12r_mag)
170-173 F4.2 mag e_z'magapR ? diameter=1.2 arcsec aperture AB mag error in
z' at R band position (zap12r_magerr)
175-178 F4.2 mag AV Galactic Extinction using IRSA (Av_SandF) (G1)
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Global notes:
Note (G1): Schlafly and Finkbeiner, 2011ApJ...737..103S 2011ApJ...737..103S.
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History:
From electronic version of the journal
References:
Micheva et al., Paper II 2017MNRAS.465..302M 2017MNRAS.465..302M, Cat. J/MNRAS/465/302
(End) Patricia Vannier [CDS] 08-Jun-2018