2017ApJ...849L..36I

Query : 2017ApJ...849L..36I

2017ApJ...849L..36I - Astrophys. J., 849, L36-L36 (2017/November-2)

Very compact millimeter sizes for composite star-forming/AGN submillimeter galaxies.

IKARASHI S., CAPUTI K.I., OHTA K., IVISON R.J., LAGOS C.D.P., BISIGELLO L., HATSUKADE B., ARETXAGA I., DUNLOP J.S., HUGHES D.H., IONO D., IZUMI T., KASHIKAWA N., KOYAMA Y., KAWABE R., KOHNO K., MOTOHARA K., NAKANISHI K., TAMURA Y., UMEHATA H., WILSON G.W., YABE K. and YUN M.S.

Abstract (from CDS):

We report the study of the far-infrared (IR) sizes of submillimeter galaxies (SMGs) in relation to their dust-obscured star formation rate (SFR) and active galactic nuclei (AGN) presence, determined using mid-IR photometry. We determined the millimeter-wave (λobs=1100 µm) sizes of 69 Atacama Large Millimeter/submillimeter Array (ALMA)-identified SMGs, selected with 10σ confidence on ALMA images (F_1100µm_=1.7-7.4 mJy). We found that all of the SMGs are located above an avoidance region in the size-flux plane, as expected by the Eddington limit for star formation. In order to understand what drives the different millimeter-wave sizes in SMGs, we investigated the relation between millimeter-wave size and AGN fraction for 25 of our SMGs at z = 1-3. We found that the SMGs for which the mid-IR emission is dominated by star formation or AGN have extended millimeter-sizes, with respective median Rc,e=1.6–0.21+0.34 and 1.5–0.24+0.93 kpc. Instead, the SMGs for which the mid-IR emission corresponds to star-forming/AGN composites have more compact millimeter-wave sizes, with median Rc,e=1.0–0.20+0.20 kpc. The relation between millimeter-wave size and AGN fraction suggests that this size may be related to the evolutionary stage of the SMG. The very compact sizes for composite star-forming/AGN systems could be explained by supermassive black holes growing rapidly during the SMG coalescing, star-formation phase.

Abstract Copyright: © 2017. The American Astronomical Society. All rights reserved.

Journal keyword(s): galaxies: evolution - galaxies: formation - galaxies: high-redshift - submillimeter: galaxies - submillimeter: galaxies

VizieR on-line data: <Available at CDS (J/ApJ/849/L36): table1.dat>

Nomenclature: Table 1: ASXDF 1100.NNN.NA N=69 among (Nos 002.1-252.1).

Simbad objects: 72

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Number of rows : 72
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 IC 1623 IG 01 07 47.380 -17 30 24.51   15       ~ 310 2
2 AS2UDS 0167.0 G 02 16 33.85 -05 02 42.7   26.37518 25.36596 25.06331   ~ 2 0
3 AS2UDS 0034.0 G 02 16 38.33 -05 01 21.5           ~ 3 0
4 AS2UDS 0087.0 G 02 16 41.04 -05 01 12.5           ~ 2 0
5 AS2UDS 0024.0 G 02 16 41.11 -05 03 51.4           ~ 5 0
6 AS2UDS 0201.0 G 02 16 41.94 -05 07 04.3   27.75404 27.64419 27.18736   ~ 2 0
7 AS2UDS 0074.0 G 02 16 44.48 -05 02 21.6   23.87139 23.71800 23.39314   ~ 2 0
8 AS2UDS 0004.0 G 02 16 47.93 -05 01 29.9     27.29742 26.76636   ~ 6 0
9 AS2UDS 0186.0 G 02 16 48.20 -04 58 59.6           ~ 6 0
10 AS2UDS 0539.0 G 02 16 50.4336 -05 10 15.758           ~ 3 0
11 AS2UDS 0060.0 G 02 16 59.4434 -05 10 55.338   23.436 22.986 22.440   ~ 6 0
12 AS2UDS 0346.0 G 02 17 05.65 -05 15 04.9           ~ 2 0
13 ASXDF 1100.095.1 G 02 17 12.9712 -05 14 12.067   27.731 26.898 26.948   ~ 5 0
14 AS2UDS 0077.0 G 02 17 13.34 -04 58 57.4           ~ 3 0
15 AS2UDS 0128.0 G 02 17 15.41 -04 57 55.6           ~ 2 0
16 AS2UDS 0116.0 G 02 17 20.02 -05 13 05.7   26.02975 25.71039 25.57254   ~ 10 0
17 AS2UDS 0084.0 G 02 17 20.80 -04 49 49.5   27.82382 27.40002 26.93976   ~ 2 0
18 AS2UDS 0069.0 G 02 17 21.53 -05 19 07.8   27.11858 27.03910 26.73968   ~ 4 0
19 AS2UDS 0036.0 G 02 17 27.3010 -05 06 42.750           ~ 4 0
20 AS2UDS 0055.0 G 02 17 29.77 -05 03 18.6   26.27905 25.80503 25.61189   ~ 3 0
21 AS2UDS 0007.0 G 02 17 30.44 -05 19 22.4           ~ 5 0
22 AS2UDS 0018.0 G 02 17 30.63 -04 59 36.8   27.94356 26.77297 26.04630   ~ 12 0
23 AS2UDS 0173.0 QSO 02 17 32.417 -05 12 51.09   22.45345 21.48767 21.61290   ~ 7 0
24 AS2UDS 0236.0 G 02 17 32.59 -04 50 26.4           ~ 2 0
25 ASXDF 1100.052.1 G 02 17 33.17 -05 01 54.5           ~ 1 0
26 AS2UDS 0136.0 G 02 17 35.37 -05 28 37.3           ~ 2 0
27 AS2UDS 0073.0 G 02 17 36.00 -05 20 34.4   24.39211 23.85281 23.39872   ~ 4 0
28 AS2UDS 0099.0 G 02 17 37.24 -04 47 53.0   27.89188 26.96745 26.55641   ~ 3 0
29 AS2UDS 0031.0 G 02 17 39.79 -05 29 19.2     27.98116 27.11823   ~ 3 0
30 AS2UDS 0028.0 G 02 17 42.11 -04 56 27.6           ~ 2 0
31 ASXDF 1100.009.1B G 02 17 42.16 -04 56 28.5           ~ 1 0
32 AS2UDS 0120.0 G 02 17 42.17 -05 25 46.8           ~ 2 0
33 AS2UDS 0519.0 G 02 17 42.55 -05 29 00.3           ~ 2 0
34 AS2UDS 0014.0 G 02 17 44.27 -05 20 08.6     27.29465 26.05094   ~ 8 0
35 AS2UDS 0454.0 G 02 17 45.85 -05 00 56.7           ~ 5 0
36 AS2UDS 0171.0 G 02 17 46.16 -04 47 47.2       27.36283   ~ 2 0
37 AS2UDS 0042.0 G 02 17 50.59 -05 30 59.2           ~ 2 0
38 AS2UDS 0465.0 G 02 17 53.25 -04 49 51.5   26.96676 26.34953 26.08070   ~ 2 0
39 AS2UDS 0414.0 G 02 17 53.87 -05 26 35.7           ~ 2 0
40 AS2UDS 0044.0 G 02 17 54.80 -05 23 23.0   27.54170 27.10372 26.76316   ~ 6 0
41 AS2UDS 0424.0 G 02 17 55.24 -05 06 45.1           ~ 2 0
42 AS2UDS 0370.0 G 02 17 56.74 -04 52 38.9   26.37572 25.77860 25.70373   ~ 6 0
43 AS2UDS 0106.0 G 02 17 59.32 -05 05 04.6   25.86702 25.04793 24.15620   ~ 10 0
44 AS2UDS 0206.0 G 02 17 59.65 -04 46 49.7           ~ 4 0
45 NAME SXDSF reg 02 18 00 -05 00.0           ~ 224 1
46 AS2UDS 0115.0 G 02 18 02.86 -05 00 31.6   25.69890 25.11196 24.48834   ~ 4 0
47 AS2UDS 0008.0 G 02 18 03.01 -05 28 41.9       26.79586   ~ 6 0
48 AS2UDS 0012.0 G 02 18 03.56 -04 55 27.3   26.11986 25.51819 25.31086   ~ 12 0
49 AS2UDS 0513.0 G 02 18 04.37 -05 34 03.5           ~ 2 0
50 AS2UDS 0684.0 G 02 18 05.51 -05 35 46.5           ~ 2 0
51 AS2UDS 0006.0 G 02 18 05.65 -05 10 49.7     27.36483 26.78275   ~ 7 0
52 AS2UDS 0169.0 G 02 18 07.85 -05 25 49.3           ~ 2 0
53 AS2UDS 0122.0 G 02 18 09.66 -05 18 43.1   25.01470 24.73363 24.51270   ~ 4 0
54 AS2UDS 0146.0 G 02 18 10.64 -05 34 53.6           ~ 2 0
55 AS2UDS 0121.1 G 02 18 11.00 -04 49 51.9     27.21253 26.30396   ~ 3 0
56 AS2UDS 0609.0 G 02 18 13.76 -05 37 27.3           ~ 2 0
57 AS2UDS 0079.0 G 02 18 13.83 -04 57 43.5           ~ 8 0
58 AS2UDS 0067.0 G 02 18 16.49 -04 55 08.8   25.91939 25.06212 24.73525   ~ 4 0
59 ASXDF 1100.097.2 G 02 18 17.61 -05 34 27.9           ~ 1 0
60 AS2UDS 0560.0 G 02 18 18.54 -05 34 34.7           ~ 2 0
61 AS2UDS 0096.0 G 02 18 18.84 -04 50 29.9   26.75304 26.52170 25.99932   ~ 3 0
62 AS2UDS 0033.0 G 02 18 20.40 -05 31 43.2           ~ 5 0
63 AS2UDS 0149.0 G 02 18 22.30 -05 07 37.0     27.12322 26.40669   ~ 2 0
64 ASXDF 1100.203.1 G 02 18 23.15 -05 27 02.0           ~ 1 0
65 AS2UDS 0022.0 G 02 18 23.73 -05 11 38.5           ~ 5 0
66 AS2UDS 0439.0 G 02 18 23.96 -05 32 07.8           ~ 2 0
67 AS2UDS 0438.0 G 02 18 24.59 -05 31 48.5       27.46519   ~ 2 0
68 AS2UDS 0218.0 G 02 18 33.31 -04 58 07.0           ~ 3 0
69 AS2UDS 0100.0 G 02 18 38.29 -05 03 18.3   27.90417 27.14939 26.24380   ~ 2 0
70 AS2UDS 0166.0 G 02 18 42.68 -04 59 32.1   25.78187 25.39683 24.85993   ~ 4 0
71 ASXDF 1100.213.1 G 02 18 44.02 -05 35 31.3           ~ 1 0
72 AS2UDS 0242.0 G 02 18 46.15 -05 04 12.5           ~ 2 0

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