2014ApJ...796...64C

Query : 2014ApJ...796...64C

2014ApJ...796...64C - Astrophys. J., 796, 64 (2014/November-3)

Hubble Space Telescope emission line galaxies at z ∼ 2: the Lyα escape fraction.

CIARDULLO R., ZEIMANN G.R., GRONWALL C., GEBHARDT H., SCHNEIDER D.P., HAGEN A., MALZ A.I., BLANC G.A., HILL G.J., DRORY N. and GAWISER E.

Abstract (from CDS):

We compare the Hβ line strengths of 1.90 < z < 2.35 star-forming galaxies observed with the near-IR grism of the Hubble Space Telescope with ground-based measurements of Lyα from the HETDEX Pilot Survey and narrow-band imaging. By examining the line ratios of 73 galaxies, we show that most star-forming systems at this epoch have a Lyα escape fraction below ∼6%. We confirm this result by using stellar reddening to estimate the effective logarithmic extinction of the Hβ emission line (cHβ= 0.5) and measuring both the Hβ and Lyα luminosity functions in a ∼100, 000 Mpc3 volume of space. We show that in our redshift window, the volumetric Lyα escape fraction is at most 4.4–1.2+2.1%, with an additional systematic ∼25% uncertainty associated with our estimate of extinction. Finally, we demonstrate that the bulk of the epoch's star-forming galaxies have Lyα emission line optical depths that are significantly greater than that for the underlying UV continuum. In our predominantly [O III] λ5007-selected sample of galaxies, resonant scattering must be important for the escape of Lyα photons.

Abstract Copyright: ∼

Journal keyword(s): cosmology: observations - galaxies: evolution - galaxies: formation - galaxies: luminosity function, mass function

VizieR on-line data: <Available at CDS (J/ApJ/796/64): table1.dat>

Nomenclature: Table 1: [CZG2014] JHHMMSS.ss+DDMMSS.s N=87.

Simbad objects: 91

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Number of rows : 91
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 [CZG2014] J033204.00-274351.6 EmG 03 32 04.00 -27 43 51.6           ~ 2 0
2 [GZC2016] 195 EmG 03 32 07.836 -27 42 27.14   26.40 26.10     ~ 4 0
3 ZFOURGE CDFS 26207 EmG 03 32 08.660 -27 42 50.29   25.08 24.93     ~ 8 0
4 ZFOURGE CDFS 16438 EmG 03 32 09.60 -27 47 39.9           ~ 6 0
5 ZFOURGE CDFS 10806 EmG 03 32 11.45 -27 50 26.7           ~ 5 0
6 ZFOURGE CDFS 26037 EmG 03 32 13.76 -27 43 00.5           ~ 3 0
7 ZFOURGE CDFS 12345 EmG 03 32 18.13022 -27 49 42.0035   24.397   24.513   ~ 9 0
8 GOODS J033221.40-275126.2 AGN 03 32 21.40298 -27 51 26.2199   24.83   25.33   ~ 15 0
9 GOODS J033223.24-274231.7 EmG 03 32 23.242 -27 42 31.65   25.229 24.92 25.042   ~ 9 0
10 [GZC2016] 176 EmG 03 32 25.82 -27 46 09.3           ~ 4 0
11 ZFOURGE CDFS 19984 EmG 03 32 26.83270 -27 46 01.9729   25.385   25.013   ~ 8 0
12 NAME GOODS Southern Field reg 03 32 28.0 -27 48 30           ~ 1623 1
13 NAME Chandra Deep Field-South reg 03 32 28.0 -27 48 30           ~ 2282 1
14 GOODS J033228.85-275220.0 EmG 03 32 28.84745 -27 52 19.9841   25.394   25.538   ~ 7 0
15 GOODS-MUSIC 9561 EmG 03 32 34.447 -27 47 42.83   25.48 25.344     ~ 11 0
16 GOODS-MUSIC 9496 EmG 03 32 35.598 -27 47 45.41   26.3497 26.28     ~ 12 0
17 CANDELS UDS F160W J033235.74-274639.0 EmG 03 32 35.735 -27 46 39.03 28.5890 27.2787 26.58   26.0703 ~ 21 0
18 JADES-GS NC 207467 EmG 03 32 40.192 -27 46 54.60 26.8449 26.6771 26.55     ~ 15 0
19 ZFOURGE CDFS 12792 EmG 03 32 40.520 -27 49 32.52   26.9472       ~ 6 0
20 [CZG2014] J033241.55-274824.4 EmG 03 32 41.549 -27 48 24.43   26.4322       ~ 6 0
21 UDF 657 EmG 03 32 42.188 -27 48 59.63   26.0551 26.0731     ~ 10 0
22 ZFOURGE CDFS 24788 EmG 03 32 43.463 -27 43 36.55   26.10 25.41     ~ 9 0
23 ZFOURGE CDFS 4783 EmG 03 32 45.54 -27 53 43.3           ~ 6 0
24 ZFOURGE CDFS 13039 EmG 03 32 46.15 -27 49 22.6           ~ 6 0
25 [CZG2014] J033259.11-275320.7 EmG 03 32 59.11 -27 53 20.7           ~ 2 0
26 [CZG2014] J033300.61-274027.0 EmG 03 33 00.61 -27 40 27.0           ~ 5 0
27 CANDELS COSMOS F160W J100015.73+022028.0 EmG 10 00 15.73 +02 20 28.1           ~ 5 0
28 ZFOURGE COSMOS 4780 EmG 10 00 17.22 +02 13 38.0 25.62 25.27 24.95 25.05 24.69 ~ 10 0
29 ZFOURGE COSMOS 13680 EmG 10 00 17.31 +02 19 26.5 25.27 24.90 24.42 24.35 24.15 ~ 8 0
30 [CZG2014] J100018.68+021459.9 EmG 10 00 18.68 +02 14 59.9           ~ 2 0
31 ZFOURGE COSMOS 5420 EmG 10 00 19.19 +02 14 06.6   24.734 24.568     ~ 8 0
32 ZFOURGE COSMOS 11276 EmG 10 00 19.55 +02 17 56.2 25.11 24.99 24.70 24.79 24.53 ~ 8 0
33 HETDEX J100020.68+021253.3 EmG 10 00 20.69 +02 12 53.4           ~ 7 0
34 ZFIRE 5298 EmG 10 00 21.92 +02 15 40.0           ~ 6 0
35 VUDS 510994477 EmG 10 00 22.90 +02 17 14.1 25.37 25.13 24.61 24.66 24.56 ~ 8 0
36 [CZG2014] J100023.23+021230.7 EmG 10 00 23.23 +02 12 30.7           ~ 3 0
37 [CZG2014] J100023.41+021432.3 EmG 10 00 23.41 +02 14 32.3           ~ 3 0
38 ZFOURGE COSMOS 8307 EmG 10 00 23.61 +02 15 57.3 25.18 24.86 24.50 24.46 24.39 ~ 12 0
39 [CZG2014] J100023.79+021310.4 EmG 10 00 23.79 +02 13 10.4           ~ 2 0
40 ZFOURGE COSMOS 5588 EmG 10 00 24.22 +02 14 11.7 25.15 24.88 24.43 24.39 24.24 ~ 9 0
41 CANDELS COSMOS F160W J100025.44+021427.8 EmG 10 00 25.45 +02 14 27.8           ~ 5 0
42 XLS 4 EmG 10 00 26.61 +02 17 14.5           ~ 6 0
43 HETDEX J100027.22+021731.5 EmG 10 00 27.24 +02 17 31.3 24.86 24.81 24.61 24.72 24.66 ~ 11 0
44 NAME COSMOS Field reg 10 00 28.60 +02 12 21.0           ~ 3639 0
45 COSMOS 1999830 EmG 10 00 28.63 +02 17 48.8 24.000 24.12 23.90 23.92 23.98 ~ 17 0
46 COSMOS2015 648058 EmG 10 00 29.57 +02 17 02.8 24.52 24.45 24.19 24.18 24.00 ~ 8 0
47 [HOS2013] COSMOS-30679 EmG 10 00 29.810 +02 18 49.00   24.05 23.12     ~ 11 0
48 COSMOS 1610005 EmG 10 00 32.32 +02 14 52.9 24.68 24.75 24.50 24.59 24.54 ~ 5 0
49 CANDELS COSMOS F160W J100032.60+021535.8 EmG 10 00 32.60 +02 15 35.9 24.90 24.84 24.45 24.50 24.56 ~ 10 0
50 COSMOS 1616510 EmG 10 00 33.95 +02 13 15.9 24.31 24.39 24.50 24.30 24.26 ~ 12 0
51 CANDELS COSMOS F160W J100034.07+021554.3 AGN 10 00 34.08 +02 15 54.4 22.41 21.43 20.70     ~ 25 0
52 ZFOURGE COSMOS 3809 EmG 10 00 35.54 +02 13 03.0 25.45 24.98 24.55 24.78 24.25 ~ 7 0
53 [MMS2013] 121253 EmG 10 00 36.68 +02 13 07.8 25.59 25.22 24.86 24.83 24.63 ~ 8 0
54 ZFOURGE COSMOS 10988 EmG 10 00 37.02 +02 17 47.5           ~ 4 0
55 ZFOURGE COSMOS 12327 EmG 10 00 38.63 +02 18 36.3 25.60 25.44 25.28 25.22 25.05 ~ 5 0
56 ZFOURGE COSMOS 6643 EmG 10 00 39.12 +02 14 51.0 24.77 24.45 24.03 24.04 23.84 ~ 14 0
57 ZFOURGE COSMOS 12069 EmG 10 00 40.82 +02 18 23.1 23.537 23.27 22.88 22.91 22.81 ~ 15 0
58 COSMOS2015 658956 EmG 10 00 41.65 +02 18 00.4 24.64 24.29 23.78 23.76 23.57 ~ 8 0
59 UVISTADR1 J100042.21+021848.5 EmG 10 00 42.21 +02 18 48.5 25.62 25.37 24.91 25.02 25.13 ~ 7 0
60 ZFOURGE COSMOS 12066 EmG 10 00 42.91 +02 18 25.8 24.91 24.66 24.24 24.29 24.22 ~ 8 0
61 CANDELS COSMOS F160W J100044.92+021553.2 EmG 10 00 44.93 +02 15 53.3 25.74 25.62 25.41 25.45 25.53 ~ 6 0
62 ZFOURGE COSMOS 10987 EmG 10 00 47.16 +02 17 44.6 24.081 23.77 23.36 23.35 23.20 ~ 8 0
63 [CZG2014] J123613.33+621145.2 EmG 12 36 13.33 +62 11 45.2           ~ 3 0
64 [CZG2014] J123615.00+621329.9 EmG 12 36 15.00 +62 13 29.9           ~ 2 0
65 GOODS J123615.85+621326.0 EmG 12 36 15.8542 +62 13 26.049 24.76 25.4136 26.5 25.37 25.6132 ~ 8 0
66 TKRS 6032 EmG 12 36 18.7621 +62 10 37.632 25.30 25.0896 25.04 24.71 24.4780 ~ 11 0
67 TKRS 5653 EmG 12 36 20.0773 +62 11 12.708 25.18 24.8567 24.93 24.41 24.4172 ~ 9 0
68 MODS deep 956 EmG 12 36 20.4821 +62 14 52.281 26.1 26.4 26.3     ~ 5 0
69 [CZG2014] J123624.96+621223.6 EmG 12 36 24.9656 +62 12 23.922 25.47 25.5336 25.66 25.20 25.0873 ~ 6 0
70 TKRS 4390 EmG 12 36 35.4255 +62 14 37.854 25.14 24.2831 24.45 23.9 23.7912 ~ 9 0
71 MODS deep 1413 EmG 12 36 40.6119 +62 13 10.951 26.4 25.91 25.86     ~ 5 0
72 TKRS 7701 EmG 12 36 41.2614 +62 11 15.969 25.6 24.8533 24.98   24.4670 ~ 7 0
73 COLDz -cont-GN-10 rG 12 36 42.093 +62 13 31.29 26.61 27.03 26.43 25.8 25.7254 ~ 75 0
74 [WBD96] 2-40.0 EmG 12 36 44.12 +62 14 01.9           ~ 3 0
75 MODS deep 2106 EmG 12 36 44.8865 +62 13 35.676 26.8 26.7 26.7     ~ 5 0
76 GOODS J123647.45+621503.7 EmG 12 36 47.4549 +62 15 03.743 25.0 25.4001 25.48   25.3223 ~ 7 0
77 Cowie 124 EmG 12 36 50.08 +62 14 00.9 25.05 25.0662 25.31 24.55 24.5726 ~ 39 0
78 GOODS J123653.33+621036.1 EmG 12 36 53.3271 +62 10 36.149 25.9 25.1160 25.09   24.6995 ~ 10 0
79 [CZG2014] J123653.79+621521.7 EmG 12 36 53.7862 +62 15 21.748 25.5 25.9 26.06     ~ 3 0
80 HPS 434 EmG 12 36 54.1731 +62 13 35.877 27.0 26.5 26.7 26.89   ~ 15 1
81 NAME GOODS-N Field reg 12 36 55.0 +62 14 15           ~ 1364 1
82 Cowie 118 EmG 12 36 55.0618 +62 13 47.430 24.77 24.7692 24.95 24.23 24.5698 ~ 38 1
83 MODS deep 3863 EmG 12 36 55.6178 +62 14 50.500 25.7 26.3 26.3     ~ 5 0
84 MODS wide 6780 EmG 12 37 02.0338 +62 14 19.073     26.6     ~ 5 0
85 [CZG2014] J123702.72+621010.8 EmG 12 37 02.7160 +62 10 10.774 25.8 25.8 25.82     ~ 4 0
86 CXOHDFN J123704.2+621446 Sy2 12 37 04.34 +62 14 46.1 24.55 24.4432 24.97 24.5 24.4307 ~ 46 0
87 GOODS J123707.10+621153.0 EmG 12 37 07.1009 +62 11 52.967 25.9 25.3146 25.26   24.9861 ~ 7 0
88 [CZG2014] J123710.42+621035.5 EmG 12 37 10.42 +62 10 35.5           ~ 4 0
89 [CZG2014] J123711.00+621140.1 EmG 12 37 11.0039 +62 11 40.428 25.4 25.0893 25.37 25.14 25.0037 ~ 8 0
90 [CZG2014] J123711.20+621431.5 EmG 12 37 11.2014 +62 14 31.534 26.3 26.1 25.81     ~ 4 0
91 MODS wide 7209 EmG 12 37 11.7620 +62 13 38.801 26.3 26.0 25.95     ~ 5 0

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