2008ApJ...680.1072D

Query : 2008ApJ...680.1072D

2008ApJ...680.1072D - Astrophys. J., 680, 1072-1082 (2008/June-3)

Lyα-emitting galaxies at 0.2<z<0.35 from GALEX spectroscopy.

DEHARVENG J.-M., SMALL T., BARLOW T.A., PEROUX C., MILLIARD B., FRIEDMAN P.G., MARTIN D.C., MORRISSEY P., SCHIMINOVICH D., FORSTER K., SEIBERT M., WYDER T.K., BIANCHI L., DONAS J., HECKMAN T.M., LEE Y.-W., MADORE B.F., NEFF S.G., RICH R.M., SZALAY A.S., WELSH B.Y. and YI S.K.

Abstract (from CDS):

We have used the GALEX (Galaxy Evolution Explorer) spectroscopic survey mode, with a resolution of ∼8 Å in the far-ultraviolet (FUV; 1350-1750 Å) and ∼20 Å in the near-ultraviolet (NUV; 1950-2750 Å) for a systematic search of Lyα-emitting galaxies at low redshift. Our aim is to fill a gap between high-redshift surveys and a small set of objects studied in detail in the nearby universe. A blind search of 7018 spectra extracted in five deep exposures (5.65 deg2) has resulted in 96 Lyα-emitting galaxy candidates in the FUV domain after accounting for broad-line AGNs. The Lyα equivalent widths (EWs) are consistent with stellar population model predictions and show no trends as a function of UV color or UV luminosity, with the exception of a possible decrease in the most luminous objects that may be due to small-number statistics. The objects' distribution in EW is similar to that at z∼3, but their fraction among star-forming galaxies is smaller. Avoiding uncertain candidates, a subsample of 66 objects in the range 0.2<z<0.35 has been used to build a Lyα luminosity function (LF). The incompleteness due to objects with significant Lyα emission but a UV continuum too low for spectral extraction has been evaluated. A comparison with Hα LFs in the same redshift domain is consistent with an average Lyα/Hα of ∼1 in about 15% of the star-forming galaxies. A comparison with high-redshift Lyα LFs implies an increase of the Lyα luminosity density by a factor of about 16 from z∼0.3 to z∼3. By comparison with the factor of 5 increase in the UV luminosity density in the same redshift range, this suggests an increase of the average Lyα escape fraction with redshift.

Abstract Copyright: ∼

Journal keyword(s): Galaxies: Evolution - Galaxies: ISM - Galaxies: Luminosity Function, Mass Function - Galaxies: Starburst - Ultraviolet: Galaxies

VizieR on-line data: <Available at CDS (J/ApJ/680/1072): table2.dat>

Nomenclature: Table 2, col(2): [DSB2008] NNNNN N=96 among (Nos 958-37457).

Simbad objects: 97

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Number of rows : 97
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 [DSB2008] 23425 EmG 00 37 29.1 -43 38 08           ~ 4 0
2 [DSB2008] 23257 EmG 00 37 54.0 -43 38 28           ~ 3 0
3 [DSB2008] 16998 EmG 00 38 04.930 -43 52 28.50           ~ 5 0
4 [CBH2010] 009.559041-44.243584 AGN 00 38 14.2 -44 14 37           ~ 4 0
5 [DSB2008] 13715 EmG 00 38 33.2 -44 00 32           ~ 2 0
6 [DSB2008] 21062 EmG 00 38 39.9 -43 43 21           ~ 4 0
7 2MASX J00393212-4411305 G 00 39 32.1636894768 -44 11 30.383729412           ~ 10 0
8 [DSB2008] 2386 EmG 00 40 01.9 -44 25 44           ~ 2 0
9 [DSB2008] 16921 EmG 00 41 05.6 -43 52 29           ~ 4 0
10 [DSB2008] 3801 EmG 03 30 56.87 -28 16 47.8           ~ 7 0
11 [CBH2010] 052.760120-27.858473 EmG 03 31 02.429 -27 51 30.50           ~ 4 0
12 [WDK2001] 28937 EmG 03 31 32.754 -27 50 04.62       22.940   ~ 1 0
13 2dFGRS TGS322Z059 G 03 31 34.68 -28 20 23.0   19.298   18.687   ~ 5 0
14 [CBH2010] 052.962204-28.188999 EmG 03 31 50.929 -28 11 20.40           ~ 9 0
15 [CBH2010] 052.976501-28.238640 EmG 03 31 54.360 -28 14 19.10           ~ 6 0
16 [DSB2008] 7100 EmG 03 31 59.8687199784 -28 09 53.261757252           ~ 6 0
17 [CBH2010] 053.049873-28.025000 G 03 32 11.934 -28 01 30.13       20.130   ~ 8 0
18 [CBH2010] 053.061584-28.186527 EmG 03 32 14.780 -28 11 11.50           ~ 4 0
19 [CBH2010] 053.077999-28.222332 SyG 03 32 18.74 -28 13 21.2   20.05   18.99   ~ 7 0
20 [DSB2008] 33311 EmG 03 32 25.1 -27 17 25           ~ 2 0
21 NAME Chandra Deep Field-South reg 03 32 28.0 -27 48 30           ~ 2282 1
22 [CBH2010] 053.174255-28.190306 EmG 03 32 41.821 -28 11 25.10           ~ 5 0
23 CXOCDFS J033256.8-275318 QSO 03 32 56.6570292528 -27 53 16.624989096 20.82 20.5562   19.874 20.2611 ~ 49 0
24 [DSB2008] 1348 EmG 03 32 57.6582082992 -28 23 18.441361896           ~ 7 0
25 [CBH2010] 053.258461-28.357668 EmG 03 33 02.031 -28 21 27.60           ~ 5 0
26 LEDA 750493 rG 03 33 07.24 -27 44 31.2       17.66   ~ 33 0
27 [CBH2010] 053.359249-27.454334 EmG 03 33 26.220 -27 27 15.60           ~ 5 0
28 [CBH2010] 053.541294-28.255499 EmG 03 34 09.911 -28 15 19.80           ~ 4 0
29 [DSB2008] 10526 EmG 03 34 20.821 -28 03 56.50           ~ 2 0
30 SWIRE J033450.70-274346.1 EmG 03 34 50.7018724656 -27 43 45.918537924           ~ 5 0
31 SWIRE J033455.08-274803.6 EmG 03 34 55.1047126776 -27 48 03.572452368           ~ 5 0
32 [DSB2008] 10937 EmG 03 35 08.4 -28 02 43           ~ 2 0
33 [DSB2008] 29558 EmG 14 16 16.7 +53 01 33           ~ 4 0
34 [DSB2008] 21579 EmG 14 16 49.9 +52 50 20           ~ 5 0
35 CXOEGS J141654.3+522440 AGN 14 16 54.27127 +52 24 39.9264   20.475   19.247 18.791 ~ 11 0
36 [CBH2010] 214.291290+53.086723 EmG 14 17 09.910 +53 05 12.20           ~ 8 0
37 [DSB2008] 34512 EmG 14 17 10.6241966616 +53 11 53.286780516           ~ 4 0
38 [CBH2010] 214.300888+52.599110 AGN 14 17 12.20862 +52 35 56.2513   20.698   20.084 19.820 ~ 9 0
39 [FCM2009] EGS27 EmG 14 17 17.27666 +52 32 17.6401   21.439   21.304 20.98 ~ 5 0
40 [CBH2010] 214.430923+52.468307 G 14 17 43.33 +52 28 05.9   22.264   21.82 22.19 ~ 18 0
41 [DSB2008] 19002 EmG 14 17 45.150 +52 46 18.10           ~ 4 0
42 [CBH2010] 214.521545+52.752110 EmG 14 18 05.16832 +52 45 07.0168   20.874   20.361 20.275 ~ 8 0
43 [DSB2008] 5087 EmG 14 18 14.3 +52 23 44           ~ 3 0
44 [DSB2008] 36336 EmG 14 18 19.6 +53 20 21           ~ 2 0
45 [DSB2008] 2368 EmG 14 18 22.441 +52 18 24.29           ~ 4 0
46 [DSB2008] 2682 EmG 14 18 48.288 +52 17 57.00           ~ 7 0
47 [DSB2008] 21024 EmG 14 18 55.62966 +52 49 27.7469   20.704   18.860 18.274 ~ 11 0
48 [DSB2008] 28751 EmG 14 18 55.968 +52 59 31.90           ~ 7 0
49 [DSB2008] 3525 EmG 14 19 07.1 +52 21 08           ~ 5 0
50 NVSS J141910+531600 rG 14 19 10.7285434590 +53 15 57.014238381           ~ 5 0
51 [DSB2008] 4719 EmG 14 19 14.700 +52 23 26.91           ~ 6 0
52 [DSB2008] 29573 EmG 14 19 30.3 +53 02 06           ~ 3 0
53 [DSB2008] 33559 EmG 14 19 36.6 +53 09 36           ~ 4 0
54 [DSB2008] 9045 EmG 14 19 37.731 +52 30 25.41           ~ 6 0
55 [DSB2008] 3488 EmG 14 19 52.980 +52 21 00.90           ~ 5 0
56 [DSB2008] 36896 EmG 14 19 53.5 +53 22 35           ~ 2 0
57 [DSB2008] 20285 EmG 14 20 31.699 +52 47 57.80           ~ 5 0
58 [CBH2010] 215.170456+53.114002 G 14 20 41.1805510344 +53 06 50.195443608   20.406   18.347 17.730 ~ 8 0
59 [DSB2008] 17005 EmG 14 20 43.286 +52 43 07.50           ~ 8 0
60 [DSB2008] 21404 EmG 14 20 44.692 +52 50 06.20           ~ 7 0
61 [DSB2008] 37380 EmG 14 20 45.7 +53 19 29           ~ 2 0
62 [DSB2008] 14069 EmG 14 21 24.657 +52 39 19.70           ~ 6 0
63 [DSB2008] 5549 EmG 14 21 54.551 +52 24 24.20           ~ 4 0
64 [CBH2010] 215.533752+52.873722 Sy1 14 22 08.1 +52 52 26   19.85 19.06     ~ 6 0
65 [CBH2010] 215.610550+52.507526 AGN 14 22 26.6 +52 30 27           ~ 3 0
66 [DSB2008] 6834 EmG 14 22 37.5 +52 27 07           ~ 1 0
67 [DSB2008] 19364 EmG 14 23 06.200 +52 46 46.91           ~ 4 0
68 [DSB2008] 17525 EmG 14 23 17.8 +52 42 49           ~ 3 0
69 [DSB2008] 17867 EmG 14 23 22.284 +52 44 32.91           ~ 4 0
70 [DSB2008] 13305 EmG 14 23 32.8 +52 37 25           ~ 2 0
71 [DSB2008] 15686 EmG 14 23 37.1 +52 40 19           ~ 1 0
72 2MASS J14344688+3517020 Sy2 14 34 46.8710552904 +35 17 01.923241200       17.48 16.81 ~ 7 0
73 [DSB2008] 30997 EmG 14 34 55.3189060704 +35 31 28.354186920       19.58 18.28 ~ 2 0
74 [DSB2008] 28521 EmG 14 36 06.299 +35 27 30.79           ~ 4 0
75 [DSB2008] 35813 EmG 14 36 13.4 +35 43 45           ~ 2 0
76 [CBH2010] 219.092041+34.942139 EmG 14 36 22.096 +34 56 32.05       19.99 19.63 ~ 5 0
77 [CBH2010] 219.100540+34.993530 EmG 14 36 23.976 +34 59 37.54       18.95 18.25 ~ 6 0
78 2MASS J14363195+3438292 QSO 14 36 31.9501899912 +34 38 29.123044548       18.75 18.13 ~ 11 1
79 CXOXB J143636.3+345035 AGN 14 36 36.648 +34 50 34.02       18.80 18.21 ~ 13 0
80 [KEC2012] 219.192803+35.417392 EmG 14 36 46.273 +35 25 02.61       18.19 17.32 ~ 4 0
81 [DSB2008] 28760 EmG 14 36 47.472 +35 26 06.66       19.79 19.57 ~ 2 0
82 [DSB2008] 19918 EmG 14 36 47.7058676712 +35 10 32.731474152       17.58 16.95 ~ 2 0
83 [CBH2010] 219.243362+35.597694 EmG 14 36 58.3309775808 +35 35 51.572668128       17.67 17.03 ~ 5 0
84 [CBH2010] 219.281967+35.692280 EmG 14 37 07.594 +35 41 31.87       20.50 20.04 ~ 4 0
85 [KEC2012] 219.333865+34.757753 EmG 14 37 20.128 +34 45 27.91       20.24 19.96 ~ 5 0
86 [CBH2010] 219.356308+34.685585 EmG 14 37 25.466 +34 41 08.16       18.30 17.68 ~ 4 0
87 [DSB2008] 33782 EmG 14 38 18.5 +35 37 50           ~ 2 0
88 [DSB2008] 10713 EmG 14 38 59.059 +34 57 38.29           ~ 3 0
89 [DSB2008] 6321 EmG 14 39 07.3 +34 50 09           ~ 1 0
90 [DSB2008] 23690 EmG 14 39 22.7 +35 18 27           ~ 2 0
91 [DSB2008] 14085 EmG 17 12 35.8 +59 56 48           ~ 3 0
92 [DSB2008] 10895 EmG 17 14 22.024 +59 50 00.00           ~ 4 0
93 [DSB2008] 14297 EmG 17 14 44.099 +59 56 50.09           ~ 3 0
94 SDSS J171516.90+592323.4 rG 17 15 16.907 +59 23 23.43           ~ 3 0
95 SDSS J171650.57+595751.4 Sy2 17 16 50.5766419824 +59 57 51.399504792       18.81   ~ 15 1
96 SDSS J171731.08+592915.0 rG 17 17 31.084 +59 29 15.03       18.25   ~ 9 0
97 SDSS J171926.42+593335.8 rG 17 19 26.428 +59 33 35.81       19.09   ~ 5 0

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