J/ApJ/865/103 STUDIES. II. NIR morphologies of submm galaxies (Chang+, 2018)
SCUBA-2 Ultra Deep Imaging EAO Survey (STUDIES).
II. Structural properties and near-infrared morphologies of faint submillimeter
galaxies.
Chang Y.-Y., Ferraro N., Wang W.-H., Lim C.-F., Toba Y., An F., Chen C.-C.,
Smail I., Shim H., Ao Y., Bunker A., Conselice C.J., Cowley W., da Cunha E.,
Fan L., Goto T., Guo K., Ho L.C., Hwang H.S., Lee C.-H., Lee M.,
Michalowski M.J., Oteo I., Scott D., Serjeant S., Shu X., Simpson J.,
Urquhart S.
<Astrophys. J., 865, 103 (2018)>
=2018ApJ...865..103C 2018ApJ...865..103C
ADC_Keywords: Galaxies, photometry; Millimetric/submm sources; Redshifts;
Morphology; Surveys
Keywords: galaxies: evolution; galaxies: high-redshift;
galaxies: star formation;
galaxies: structure; submillimeter: galaxies
Abstract:
We present structural parameters and morphological properties of faint
450µm selected submillimeter galaxies (SMGs) from the JCMT Large
Program, STUDIES, in the COSMOS-CANDELS region. Their properties are
compared to an 850µm selected and a matched star-forming samples.
We investigate stellar structures of 169 faint 450µm sources
(S450=2.8-29.6mJy; S/N>4) at z<3 using HST near-infrared
observations. Based on our spectral energy distribution fitting, half
of such faint SMGs (LIR=1011.65±0.98^L☉) lie above the
star formation rate (SFR)/stellar mass plane. The size-mass relation
shows that these SMGs are generally similar to less-luminous
star-forming galaxies selected by NUV-r versus r-J colors. Because of
the intrinsic luminosity of the sample, their rest-frame optical
emission is less extended than the 850µm sources (S850>2mJy) and
more extended than the star-forming galaxies in the same redshift
range. For the stellar mass and SFR-matched sample at z∼1 and z∼2, the
size differences are marginal between faint SMGs and the matched
galaxies. Moreover, faint SMGs have similar Sersic indices and
projected axis ratios as star-forming galaxies with the same stellar
mass and SFR. Both SMGs and the matched galaxies show high fractions
(∼70%) of disturbed features at z∼2, and the fractions depend on the
SFRs. These suggest that their star formation activity is related to
galaxy merging and the stellar structures of SMGs are similar to those
of star-forming galaxies. We show that the depths of submillimeter
surveys are approaching the lower luminosity end of star-forming
galaxies, allowing us to detect galaxies on the main sequence.
Description:
In this paper, we use our extremely deep 450 and 850um data obtained
through the SCUBA-2 Ultra Deep Imaging EAO Survey (STUDIES) program,
as well as data from the JCMT archive. A full description of STUDIES
is given by Wang+ (2017ApJ...850...37W 2017ApJ...850...37W).
STUDIES is a multi-year JCMT Large Program, aiming to reach the
confusion limit and an rms noise below 0.6mJy at 450um in the
COSMOS-CANDELS region. In this paper, we include the first 2 years of
data from STUDIES (170hr).
We also include the extremely deep archival data from the JCMT Legacy
Program, S2CLS (Geach+ 2013MNRAS.432...53G 2013MNRAS.432...53G, 150hr, program code: MJLSC01),
and the shallower but wider archival data of
Casey+ (2013, J/MNRAS/436/1919 20hr, program code: M11BH11A, M12AH11A,
and M12BH21A).
The final combined 450um map as shown in Figure 1 achieves an rms
sensitivity of 0.7mJy in its center.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 107 188 List of 188 submillimeter galaxies (SMGs) sources
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See also:
J/ApJS/143/315 : IRAS 1Jy sample of ultraluminous gal. II. (Veilleux+, 2002)
J/ApJ/622/772 : Redshift survey of submillimeter galaxies (Chapman+, 2005)
J/MNRAS/358/149 : HDFN SCUBA Super-map. III (Pope+, 2005)
J/ApJS/172/70 : zCOSMOS-bright catalog (Lilly+, 2007)
J/MNRAS/413/80 : Hubble Space Telescope GOODS NICMOS Survey (Conselice+, 2011)
J/ApJ/730/125 : HST/NICMOS obs. of bright IR galaxies (Zamojski+, 2011)
J/ApJS/203/24 : Structural param. of galaxies in CANDELS (van der Wel+, 2012)
J/MNRAS/436/1919 : SCUBA observations of COSMOS galaxies (Casey+, 2013)
J/A+A/556/A55 : Multi-color photom. of star-forming galaxies (Ilbert+, 2013)
J/MNRAS/436/430 : SCUBA-2 cosmology legacy survey (Roseboom+, 2013)
J/ApJ/788/125 : ALMA survey of ECDFS submillimeter galaxies (Simpson+, 2014)
J/ApJS/219/8 : SFR for WISE + SDSS spectroscopic galaxies (Chang+, 2015)
J/ApJ/806/110 : ALESS survey: SMGs in the ECDF-S data (da Cunha+, 2015)
J/ApJS/221/11 : CANDELS visual classifications for GOODS-S (Kartaltepe+, 2015)
J/ApJ/819/62 : The COSMOS-Legacy Survey (CLS) catalog (Civano+, 2016)
J/MNRAS/458/4321 : SCUBA-2 galaxies in 850um survey (Koprowski+, 2016)
J/ApJS/224/24 : The COSMOS2015 catalog (Laigle+, 2016)
J/ApJ/817/34 : C-COSMOS Legacy multiwavelength cat. (Marchesi+, 2016)
J/ApJ/837/139 : SUPER GOODS. I. Ultradeep SCUBA-2 survey (Cowie+, 2017)
J/ApJ/840/78 : z survey of ALMA-identified SMGs in ECDFS (Danielson+, 2017)
J/ApJ/850/83 : DANCING-ALMA. I. submm/mm continuum sources (Fujimoto+, 2017)
J/MNRAS/465/1789 : SCUBA-2 Cosmology Legacy Survey (Geach+, 2017)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 I6 --- ID [611035/835952] COSMOS2015 Identifier (1)
8- 11 F4.2 --- zphot [0/4.4] Photometric redshift (1)
13- 21 F9.5 deg RAdeg [149.96/150.24] Right Ascension (J2000) (1)
23- 29 F7.5 deg DEdeg [2.2/2.6] Declination (J2000) (1)
31- 35 F5.2 mJy S450 [2.7/29.7]? SCUBA 450 um flux
37- 41 F5.2 --- SNR-450 [3.5/35.6]? 450um signal-to-noise ratio
43- 47 F5.2 mJy S850 [2/12.8]? SCUBA 850 um flux
49- 53 F5.2 --- SNR-850 [6/82]? 850um signal-to-noise ratio
55- 59 F5.2 Msun Mstar [8/11.7]? Stellar mass
61- 64 F4.2 Msun e_Mstar [0/0.6]? Uncertainty in Mstar
66- 70 F5.2 Msun/yr SFR [-0.2/3.1]? Star-formation rate
72- 75 F4.2 Msun/yr e_SFR [0.0/0.6]? Uncertainty in SFR
77- 81 F5.2 kpc Reff [0/60.2]? Effective radius
83- 87 F5.2 kpc e_Reff [0/17.3]? Uncertainty in Reff
89- 92 F4.2 --- q [0.05/1]? Projected axis ratio
94- 97 F4.2 --- e_q [0/0.28]? Uncertainty in q
99-102 F4.2 --- n [0.2/8]? Sersic index
104-107 F4.2 --- e_n [0/2.5]? Uncertainty in n
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Note (1): Identifiers, photometric redshifts, and equatorial positions taken
from COSMOS2015 catalog, Laigle+ (2016, J/ApJS/224/24).
--------------------------------------------------------------------------------
History:
From electronic version of the journal
References:
Wang et al. Paper I. 2017ApJ...850...37W 2017ApJ...850...37W
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 17-Sep-2019