2014ApJ...795...33E


C.D.S. - SIMBAD4 rel 1.7 - 2021.05.16CEST20:18:51

2014ApJ...795...33E - Astrophys. J., 795, 33 (2014/November-1)

The Lyα properties of faint galaxies at z ∼ 2-3 with systemic redshifts and velocity dispersions from Keck-MOSFIRE.

ERB D.K., STEIDEL C.C., TRAINOR R.F., BOGOSAVLJEVIC M., SHAPLEY A.E., NESTOR D.B., KULAS K.R., LAW D.R., STROM A.L., RUDIE G.C., REDDY N.A., PETTINI M., KONIDARIS N.P., MACE G., MATTHEWS K. and McLEAN I.S.

Abstract (from CDS):

We study the Lyα profiles of 36 spectroscopically detected Lyα-emitters (LAEs) at z ∼ 2-3, using Keck MOSFIRE to measure systemic redshifts and velocity dispersions from rest-frame optical nebular emission lines. The sample has a median optical magnitude MUV~= -22 to MUV> -18.2, and ranges from Mdyn < 1.3 x 108 M to Mdyn = 6.8 x 109 M, corresponding to rest-frame UV absolute magnitudes MUV≃ -22 to MUV> -18.2. Dynamical masses range from Mdyn< 1.3x108 M to Mdyn= 6.8x109 M, with a median value of Mdyn= 6.3x108 M. Thirty of the 36 Lyα emission lines are redshifted with respect to the systemic velocity with at least 1σ significance, and the velocity offset with respect to systemic ΔvLyαis correlated with the R-band magnitude, MUV, and the velocity dispersion measured from nebular emission lines with >3σ significance: brighter galaxies with larger velocity dispersions tend to have larger values of ΔvLyα. We also make use of a comparison sample of 122 UV-color-selected R < 25.5 galaxies at z ∼ 2, all with Lyα emission and systemic redshifts measured from nebular emission lines. Using the combined LAE and comparison samples for a total of 158 individual galaxies, we find that ΔvLyα is anti-correlated with the Lyα equivalent width with 7σ significance. Our results are consistent with a scenario in which the Lyα profile is determined primarily by the properties of the gas near the systemic redshift; in such a scenario, the opacity to Lyα photons in lower mass galaxies may be reduced if large gaseous disks have not yet developed and if the gas is ionized by the harder spectrum of young, low metallicity stars.

Abstract Copyright:

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

Nomenclature: Table 1: [ESS2003] Q1700-BNBNNN N=17 among (Nos 17-157).

Simbad objects: 37

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Number of rows : 37

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 [ESS2003] Q1700-BNB26 EmG 16 59 59.1030 +64 06 51.363           ~ 1 0
2 [ESS2003] Q1700-BNB157 EmG 17 00 21.5130 +64 07 20.169           ~ 1 0
3 [ESS2003] Q1700-BNB47 EmG 17 00 31.7460 +64 15 38.774           ~ 1 0
4 [ESS2003] Q1700-BNB93 EmG 17 00 32.6200 +64 16 28.437           ~ 1 0
5 [ESS2003] Q1700-BNB51 EmG 17 00 36.1690 +64 07 30.651           ~ 1 0
6 [ESS2003] Q1700-BNB27 EmG 17 00 46.2150 +64 19 04.119           ~ 1 0
7 [ESS2003] Q1700-BNB18 EmG 17 00 50.5880 +64 07 28.636           ~ 1 0
8 [ESS2003] Q1700-BNB104 EmG 17 00 51.7860 +64 14 58.858           ~ 1 0
9 [ESS2003] Q1700-BNB153 EmG 17 01 04.8440 +64 12 52.376           ~ 1 0
10 [ESS2003] Q1700-BNB36 EmG 17 01 18.7090 +64 12 40.142           ~ 1 0
11 [ESS2003] Q1700-BNB95 EmG 17 01 23.4580 +64 14 40.281           ~ 1 0
12 [ESS2003] Q1700-BNB88 EmG 17 01 27.2410 +64 07 29.465           ~ 1 0
13 [ESS2003] Q1700-BNB42 EmG 17 01 31.7000 +64 08 50.079           ~ 1 0
14 [ESS2003] Q1700-BNB17 EmG 17 01 33.6850 +64 06 53.143           ~ 1 0
15 [ESS2003] Q1700-BNB19 EmG 17 01 43.5790 +64 12 52.591           ~ 1 0
16 [ESS2003] Q1700-BNB115 EmG 17 01 47.6230 +64 13 23.974           ~ 1 0
17 [ESS2003] Q1700-BNB29 EmG 17 01 51.2740 +64 08 24.741           ~ 1 0
18 [YMK2012] LAE J221718.8+001518 EmG 22 17 18.77 +00 15 18.1       27.00   ~ 4 0
19 [YMK2012] LAE J221719.3+001450 EmG 22 17 19.25 +00 14 50.9       25.82   ~ 4 0
20 [NSS2011] 66 EmG 22 17 20.86 +00 15 11.8       26.64   ~ 3 0
21 SAS-LBG SSA22a-C28 EmG 22 17 21.11 +00 15 28.0       24.87   ~ 5 0
22 [NSS2011] 46 EmG 22 17 21.47 +00 14 54.6       27.00   ~ 3 0
23 [NSS2011] 42 EmG 22 17 21.50 +00 17 04.7       25.50   ~ 3 0
24 [YMK2012] LAE J221722.9+001441 EmG 22 17 22.87 +00 14 41.7       26.53   ~ 4 0
25 [NSS2011] 63 EmG 22 17 23.32 +00 15 52.9       26.55   ~ 3 0
26 [MYH2004] LAB 35 EmG 22 17 24.79 +00 17 17.4       25.51   ~ 19 0
27 [AMH2017] VLA-LAB16 EmG 22 17 24.80 +00 11 16.8       27.00   ~ 17 0
28 [YMK2012] LAE J221727.2+001622 EmG 22 17 27.18 +00 16 21.7       25.98   ~ 4 0
29 [NSS2011] 4 EmG 22 17 28.01 +00 14 30.0       24.34   ~ 7 0
30 [YMK2012] LAE J221728.3+001212 EmG 22 17 28.29 +00 12 12.3       25.84   ~ 7 0
31 [NSS2011] 72 EmG 22 17 31.24 +00 17 32.1       27.00   ~ 4 0
32 SAS-LBG SSA22a-M28 EmG 22 17 31.69 +00 16 57.6       24.75   ~ 22 0
33 SAS-LBG SSA22a-D3 EmG 22 17 32.40 +00 11 34.1       23.92   ~ 36 0
34 SSA 22 reg 22 17 34.7 +00 15 07           ~ 280 0
35 [NSS2011] 82 EmG 22 17 35.44 +00 16 47.6       27.00   ~ 4 0
36 [NSS2011] 67 EmG 22 17 36.26 +00 13 11.7       26.40   ~ 3 0
37 [NSS2011] 78 EmG 22 17 37.68 +00 16 48.3       25.95   ~ 4 0

    Equat.    Gal    SGal    Ecl

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