2016ApJ...819...25K

Query : 2016ApJ...819...25K

2016ApJ...819...25K - Astrophys. J., 819, 25 (2016/March-1)

Morphological properties of Lyα emitters at redshift 4.86 in the cosmos field: clumpy star formation or merger?

KOBAYASHI M.A.R., MURATA K.L., KOEKEMOER A.M., MURAYAMA T., TANIGUCHI Y., KAJISAWA M., SHIOYA Y., SCOVILLE N.Z., NAGAO T. and CAPAK P.L.

Abstract (from CDS):

We investigate morphological properties of 61 Lyα emitters (LAEs) at z = 4.86 identified in the COSMOS field, based on Hubble Space Telescope Advanced Camera for Surveys (ACS) imaging data in the F814W band. Out of the 61 LAEs, we find the ACS counterparts for 54 LAEs. Eight LAEs show double-component structures with a mean projected separation of 0".63 (∼4.0 kpc at z = 4.86). Considering the faintness of these ACS sources, we carefully evaluate their morphological properties, that is, size and ellipticity. While some of them are compact and indistinguishable from the point-spread function (PSF) half-light radius of 0".07 (∼0.45 kpc), the others are clearly larger than the PSF size and spatially extended up to 0".3 (∼1.9 kpc). We find that the ACS sources show a positive correlation between ellipticity and size and that the ACS sources with large size and round shape are absent. Our Monte Carlo simulation suggests that the correlation can be explained by (1) the deformation effects via PSF broadening and shot noise or (2) the source blending in which two or more sources with small separation are blended in our ACS image and detected as a single elongated source. Therefore, the 46 single-component LAEs could contain the sources that consist of double (or multiple) components with small spatial separation (i.e., ≲0".3 or 1.9 kpc). Further observation with high angular resolution at longer wavelengths (e.g., rest-frame wavelengths of ≳4000 Å) is inevitable to decipher which interpretation is adequate for our LAE sample.

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Journal keyword(s): cosmology: observations - early universe - galaxies: evolution - galaxies: formation - galaxies: high-redshift

Simbad objects: 63

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Number of rows : 63
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 [STS2009] 61 EmO 09 57 50.63 +02 33 49.4           ~ 2 0
2 [STS2009] 19 EmO 09 57 54.99 +01 42 47.3           ~ 2 0
3 [STS2009] 33 EmO 09 57 58.65 +02 06 41.0           ~ 2 0
4 COSMOS2015 499354 G 09 58 01.57 +02 03 35.7     27.792 26.10 24.72 ~ 3 0
5 COSMOS2015 189780 G 09 58 01.80 +01 34 11.4     28.179     ~ 2 0
6 [STS2009] 50 EmO 09 58 02.46 +02 18 05.0           ~ 2 0
7 [STS2009] 60 EmO 09 58 21.16 +02 31 15.6           ~ 2 0
8 [STS2009] 59 EmO 09 58 24.80 +02 36 45.3           ~ 2 0
9 [STS2009] 49 EmO 09 58 30.43 +02 25 43.0           ~ 2 0
10 [STS2009] 71 EmO 09 58 38.66 +02 44 23.2           ~ 2 0
11 [STS2009] 27 EmO 09 58 48.35 +01 52 49.2           ~ 2 0
12 [STS2009] 72 EmO 09 58 54.32 +02 39 52.9           ~ 2 0
13 [STS2009] 57 EmO 09 59 01.84 +02 34 22.7           ~ 2 0
14 [STS2009] 25 EmO 09 59 03.61 +01 50 09.4           ~ 2 0
15 COSMOS2015 906718 G 09 59 08.96 +02 40 41.8   27.235 26.609     ~ 2 0
16 [STS2009] 31 EmO 09 59 12.62 +01 58 35.1           ~ 2 0
17 [STS2009] 78 EmO 09 59 13.58 +02 51 42.3           ~ 2 0
18 [STS2009] 16 EmO 09 59 16.18 +01 44 17.0           ~ 2 0
19 [STS2009] 18 EmO 09 59 16.23 +01 38 19.5           ~ 2 0
20 [ECM2024] 137-CGr79 EmO 09 59 17.26 +01 49 34.2           ~ 2 0
21 [STS2009] 42 EmO 09 59 20.24 +02 16 13.1           ~ 2 0
22 [STS2009] 17 EmO 09 59 24.81 +01 42 10.2           ~ 2 0
23 [STS2009] 48 EmO 09 59 26.41 +02 23 25.2           ~ 2 0
24 [STS2009] 15 EmO 09 59 28.59 +01 44 28.2           ~ 2 0
25 COSMOS2015 788192 EmG 09 59 29.34 +02 29 50.3           ~ 9 0
26 COSMOS2015 808385 G 09 59 35.18 +02 31 39.9           ~ 4 0
27 [STS2009] 14 EmO 09 59 41.73 +01 42 25.0           ~ 2 0
28 COSMOS2015 924171 EmG 09 59 46.67 +02 42 15.7           ~ 7 0
29 HSCS J095950+022451 EmG 09 59 50.02 +02 24 51.4           ~ 5 0
30 [HCS2018] J149.9679+02.2581 EmG 09 59 52.31 +02 15 29.4           ~ 5 0
31 HSCS J095956+015451 EmG 09 59 56.15 +01 54 51.6           ~ 6 0
32 COSMOS2015 555120 EmG 10 00 04.17 +02 08 45.8   28.250 27.324     ~ 9 0
33 NAME COSMOS Field reg 10 00 28.60 +02 12 21.0           ~ 3639 0
34 COSMOS2015 214169 EmG 10 00 30.43 +01 36 21.6           ~ 8 0
35 COSMOS2015 781008 G 10 00 32.41 +02 29 09.8           ~ 8 0
36 CANDELS COSMOS F160W J100041.07+022637.3 EmG 10 00 41.08 +02 26 37.4           ~ 12 0
37 [STS2009] 39 EmO 10 00 42.45 +02 09 46.5           ~ 2 0
38 [STS2009] 13 EmO 10 00 52.75 +01 38 51.3           ~ 2 0
39 COSMOS2015 604211 EmG 10 00 55.43 +02 13 09.2           ~ 9 0
40 [STS2009] 77 EmO 10 00 55.81 +02 50 57.2           ~ 2 0
41 [STS2009] 54 EmO 10 00 58.35 +02 31 49.2           ~ 2 0
42 [STS2009] 67 EmO 10 01 07.56 +02 39 06.1           ~ 2 0
43 COSMOS2015 879590 EmG 10 01 11.32 +02 38 05.4   27.791 27.327     ~ 7 0
44 [STS2009] 66 EmO 10 01 12.06 +02 39 58.2           ~ 2 0
45 COSMOS2015 966447 G 10 01 12.68 +02 46 21.1     27.838     ~ 2 0
46 COSMOS2015 366431 G 10 01 15.84 +01 50 55.8   28.624 27.765 26.30 24.89 ~ 3 0
47 HSCS J100122+022249 EmG 10 01 22.44 +02 22 49.9           ~ 6 0
48 [STS2009] 22 EmO 10 01 34.24 +01 51 10.0           ~ 2 0
49 [STS2009] 3 EmO 10 01 44.10 +01 35 05.1           ~ 2 0
50 [STS2009] 21 EmO 10 01 44.91 +01 49 16.5           ~ 2 0
51 [STS2009] 64 EmO 10 01 45.54 +02 43 14.3           ~ 2 0
52 COSMOS2015 490061 AGN 10 01 45.98 +02 02 44.3     27.270 25.80 24.10 ~ 5 0
53 COSMOS2015 235910 G 10 01 47.44 +01 38 21.8   26.736 28.166     ~ 2 0
54 [STS2009] 44 EmO 10 01 57.57 +02 24 19.1           ~ 2 0
55 [STS2009] 29 EmO 10 02 05.47 +02 03 14.4           ~ 2 0
56 [STS2009] 43 EmO 10 02 44.52 +02 25 21.3           ~ 2 0
57 [STS2009] 1 EmO 10 02 45.56 +01 35 52.9           ~ 2 0
58 [STS2009] 11 EmO 10 02 47.63 +01 38 35.6           ~ 2 0
59 [STS2009] 10 EmO 10 02 47.68 +01 39 32.3           ~ 2 0
60 [STS2009] 9 EmO 10 02 54.89 +01 39 16.0           ~ 2 0
61 [STS2009] 51 EmO 10 02 54.97 +02 35 03.0           ~ 2 0
62 COSMOS2015 603217 G 10 02 58.64 +02 12 59.3   27.037 26.422     ~ 2 0
63 [STS2009] 63 EmO 10 03 03.46 +02 41 19.2           ~ 2 0

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