J/MNRAS/468/1123 LAE among star-forming galaxies at z=2.5 (Shimakawa+, 2017)
Similarities and uniqueness of Ly α emitters among star-forming
galaxies at z = 2.5.
Shimakawa R., Kodama T., Shibuya T., Kashikawa N., Tanaka I., Matsuda Y.,
Tadaki K.-I., Koyama Y., Hayashi M., Suzuki T.L., Yamamoto M.
<Mon. Not. R. Astron. Soc., 468, 1123-1141 (2017)>
=2017MNRAS.468.1123S 2017MNRAS.468.1123S (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, spectra ; Redshifts ; Equivalent widths ; Ultraviolet
Keywords: galaxies: evolution - galaxies: formation - galaxies: high-redshift
Abstract:
We conducted a deep narrow-band imaging survey with the Subaru Prime
Focus Camera on the Subaru Telescope and constructed a sample of
Lyα emitters (LAEs) at z=2.53 in the UDS-CANDELS field, where
a sample of Hα emitters (HAEs) at the same redshift is already
obtained from our previous narrow-band observation at near-infrared.
The deep narrow-band and multibroad-band data allow us to find LAEs of
stellar masses and star formation rates (SFRs) down to ≥108M☉
and ≥0.2 M☉/yr, respectively. We show that the LAEs are located
along the same mass-SFR sequence traced by normal star-forming
galaxies such as HAEs, but towards a significantly lower mass regime.
Likewise, LAEs seem to share the same mass-size relation with typical
star-forming galaxies, except for the massive LAEs that tend to show
significantly compact sizes. We identify a vigorous mass growth in the
central part of LAEs: the stellar mass density in the central region
of LAEs increases as their total galaxy mass grows. On the other hand,
we see no Lyα line in emission for most of the HAEs. Rather, we
find that the Lyα feature is either absent or in absorption
(Lyα absorbers, LAAs), and its absorption strength may increase
with reddening of the UV continuum slope. We demonstrate that a deep
Lyα narrow-band imaging like this study is able to search for
not only LAEs but also LAAs in a certain redshift slice. This work
suggests that LAEs trace normal star-forming galaxies in the low-mas
Description:
We have conducted an optical NB imaging survey with the Suprime-Cam to
search for LAEs at z=2.5 in the UDS-CANDELS field where we have
already identified many HAEs in the same redshift slice by our
previous NB imaging survey at NIR. Together with existing WFC3/IR data
from the HST and multiband photometries from various large programs,
we identify 50 LAE candidates at z=2.53 down to stellar mass of
108M☉ and SFR of 0.2M☉/yr. Our sample are limited by
Lyα luminosities (>4.40x1041erg/s in 1.5 arcsec aperture
diameter), Lyα EWs (>15Å) and HF160W-band magnitude
(<26.89mag).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 134 50 Final catalogue of LAEs at z=2.5
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See also:
J/ApJS/203/24 : Structural parameters of galaxies in CANDELS
(van der Wel+, 2012)
J/ApJS/214/24 : 3D-HST+CANDELS catalog (Skelton+, 2014)
J/ApJS/225/27 : 3D-HST Survey: grism spectra master catalog (Momcheva+, 2016)
J/A+A/498/13 : Lyman-α emitters from redshifts z∼2-3 (Nilsson+, 2009)
J/ApJ/706/762 : LAEs at z∼4.5 in the LALA Cetus field (Wang+, 2009)
J/MNRAS/403/L54 : Lyα emitters (LAE) in A1689-7.1 (Matsuda+, 2010)
J/ApJ/736/31 : HETDEX pilot survey. II. 1.9<z<3.8 LAEs (Blanc+, 2011)
J/ApJ/738/136 : LAEs between 0.19<z<1.25 with GALEX grism (Cowie+, 2011)
J/ApJ/743/9 : z=3.1 LAEs morphological properties (Gronwall+, 2011)
J/ApJ/744/110 : LAE galaxies between 2.1=<z≤3.1 (Ciardullo+, 2012)
J/ApJ/751/29 : Lyα profiles of LAEs at z=3.1 (Yamada+, 2012)
J/ApJ/753/95 : LAE galaxies in the ECDF-S at z∼2.1 and z∼3.1 (Bond+, 2012)
J/ApJ/765/47 : Lyman-break galaxies and LAEs at z∼3 (Nestor+, 2013)
J/ApJ/779/65 : Photometry of LBGs, LAEs and GNBs at z∼2.85 (Mostardi+, 2013)
J/ApJ/810/107 : Lyman break galaxies and LAEs HST photometry (Mostardi+ 2015)
J/ApJ/813/78 : z=4.5 and z=5.7 LAEs properties with Spitzer
(Finkelstein+, 2015)
J/ApJ/863/92 : LAE cand. at z∼5.7 in the field of QSO J0148+0600
(Becker+, 2015)
J/ApJ/845/172 : LAE candidates around bright Lyα blobs (Badescu+, 2017)
J/MNRAS/465/316 : Lyman continuum LAEs and LBGs in SSA22 field (Micheva+, 2017)
J/ApJ/865/L1 : LAEs discovered with ultra-deep MUSE sp. in UDF
(Maseda+, 2018)
J/A+A/628/A3 : LAE z∼3-7 luminosity functions (de La Vieuville+, 2019)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- ID ID of LAEs defined by this paper
5- 9 I5 --- IDHST ID of 3D-HST UDS catalogue
(Skelton et al., 2014, Cat. J/ApJS/214/24)
11- 18 F8.5 deg RAdeg Peak right ascension of NB flux (J2000)
20- 27 F8.5 deg DEdeg Peak declination of NB flux (J2000)
29- 32 F4.2 --- zbest Photometric redshift (z_best) from
Momcheva et al. (2016, Cat. J/ApJS/225/27)
34- 38 F5.1 10+34W LLya Lyα luminosity (in 1041erg/s)
40- 42 F3.1 10+34W e_LLya Lyα luminosity 1sigma error
(in 1041erg/s)
44- 46 I3 0.1nm EWLya Equivalent width of Lyα emission
48- 49 I2 0.1nm e_EWLya Equivalent width of Lyα emission
1sigma error
51- 55 F5.2 --- beta UV slope
57- 60 F4.2 --- e_beta UV slope 1sigma error
62- 66 F5.2 [Msun] logM* Log stellar mass
69- 72 F4.2 [Msun] e_logM* Negative error on logM* (1)
75- 78 F4.2 [Msun] E_logM* Positive error on logM* (1)
80- 83 F4.1 Msun/yr SFRUVB SFR from UV luminosity, dust corrected based
on UV slope
86- 89 F4.1 Msun/yr e_SFRUVB Negative error on SFRUVB
92- 96 F5.1 Msun/yr E_SFRUVB Positive error on SFRUVB
98-102 F5.1 Msun/yr SRFUVsed SFR from UV luminosity, dust corrected based
on Av from the SED fitting
105-109 F5.1 Msun/yr e_SRFUVsed Negative error on SRFUVsed
112-116 F5.1 Msun/yr E_SRFUVsed Positive error on SRFUVsed
118-123 F6.2 kpc Re Effective radii (van der Wel et al., 2012,
Cat. J/ApJS/203/24)
125-130 F6.2 kpc e_Re Effective radii 1sigma error (van der Wel
et al., 2012, Cat. J/ApJS/203/24)
132 I1 --- f_Re [0/2] Fitting result flag (2)
134 A1 --- Note [*] Nore on LAE (3)
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Note (1): 68th percentiles assuming Chabrier IMF based on FAST SED fitting
(Kriek et al., 2009ApJ...700..221K 2009ApJ...700..221K).
Note (2): fitting results, defined by van der Wel et al., 2012,
Cat. J/ApJS/203/24 as follows:
0 = good fit
1 = suspicious fit
2 = bad fit
Note (3): Supplementary comments:
LAE-031 = MIPS 24mm sources found by SpUDS (Dunlop et al., 2007, A Spitzer
Public Legacy survey of the UKIDSS Ultra Deep Survey, Spitzer
Proposal) overlap those objects within 3 arcsec radius
LAE-087 = Ha emitter at z=2.5 selected by Tadaki et al.
(2013ApJ...778..114T 2013ApJ...778..114T, 2014ApJ...780...77T 2014ApJ...780...77T)
LAE-114 = HST images are affected by diffraction spikes
LAE-118 = Ha emitter at z=2.5 selected by Tadaki et al.
(2013ApJ...778..114T 2013ApJ...778..114T, 2014ApJ...780...77T 2014ApJ...780...77T)
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 09-Dec-2019