2001A&A...379..798P

Query : 2001A&A...379..798P

2001A&A...379..798P - Astronomy and Astrophysics, volume 379798-806 (2001/12-1)

Hα emitting galaxies and the star formation rate density at z ≃ 0.24.

PASCUAL S., GALLEGO J., ARAGON-SALAMANCA A. and ZAMORANO J.

Abstract (from CDS):

We have carried out a survey searching for Hα emitting galaxies at z≃0.24 using a narrow band filter tuned with the redshifted line. The total sky area covered was 0.19 square degrees within the redshift range 0.228 to 0.255 in a set of four fields in the ELAIS-N1 zone. This corresponds to a volume of 9.8x103Mpc3 and a look-back time of 3.6Gyr when H0=50km/s/Mpc and q0=0.5 are assumed. A total of 52 objects are selected as candidates for a broad band limiting magnitude of I∼22.9, plus 16 detected only in the narrow band image for a narrow band limiting magnitude for object detection of 21.0. The threshold detection corresponds to about 20Å equivalent width with an uncertainty of ~±10Å. Point-like objects (15) were excluded from our analysis using CLASS_STAR parameter from SExtractor. The contamination from other emission lines such as [OII]λ3727, Hβ and [OIII]λλ 4959,5007 at redshifts 1.2, 0.66 and 0.61 respectively is estimated, and found to be negligible at the flux limits of our sample. We find an extinction-corrected Hα luminosity density of (5.4±1.1)x1039erg/s/Mpc3. This uncertainty takes into account the photometric and Poissonian errors only. Assuming a constant relation between the Hα luminosity and star formation rate, the SFR density in the covered volume is (0.043±0.009)M☉/yr/Mpc3. This translates to (0.037 ±0.009) M☉ yr–1.Mpc–3 when the total density is corrected for the AGN contribution as estimated in the local Universe. This value is a factor ∼4 higher than the local SFR density. This result needs to be confirmed by future spectroscopic follow-up observations.

Abstract Copyright: ∼

Journal keyword(s): galaxies: distances and redshifts - galaxies: evolution - galaxies: luminosity function, mass function

VizieR on-line data: <Available at CDS (J/A+A/379/798): table2.dat>

Nomenclature: Table 1: ELAIS aN (Nos a3-a4, b3-b4). Tables 2: [PGA2001] ELAIS aN NNNNN N=25+19+5+20.

Simbad objects: 74

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Number of rows : 74
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 [PGA2001] ELAIS a4 723 G 16 03 08.7 +54 32 16           ~ 1 0
2 [PGA2001] ELAIS a4 1427 G 16 03 20.1 +54 29 40           ~ 1 0
3 [PGA2001] ELAIS a4 2126 * 16 03 28.2 +54 37 54           ~ 1 0
4 [PGA2001] ELAIS a4 2158 * 16 03 28.5 +54 27 40           ~ 1 0
5 [PGA2001] ELAIS a4 2606 * 16 03 32.5 +54 27 02           ~ 1 0
6 [PGA2001] ELAIS a4 2734 G 16 03 33.6 +54 27 13           ~ 1 0
7 [PGA2001] ELAIS a4 2795 G 16 03 34.0 +54 26 57           ~ 1 0
8 [PGA2001] ELAIS b4 5083 G 16 03 55.0 +54 20 32           ~ 1 0
9 [PGA2001] ELAIS b4 5353 G 16 03 56.0 +54 19 55           ~ 1 0
10 [PGA2001] ELAIS b4 5420 G 16 03 56.6 +54 19 56           ~ 1 0
11 [PGA2001] ELAIS b4 5465 G 16 03 57.2 +54 20 53           ~ 1 0
12 [PGA2001] ELAIS b4 5526 G 16 03 57.8 +54 18 15           ~ 1 0
13 [PGA2001] ELAIS b4 6643 G 16 04 01.2 +54 22 32           ~ 1 0
14 [PGA2001] ELAIS b4 6574 G 16 04 01.8 +54 22 32           ~ 1 0
15 [PGA2001] ELAIS b4 6733 G 16 04 02.6 +54 21 21           ~ 1 0
16 [PGA2001] ELAIS b4 7323 G 16 04 06.5 +54 23 58           ~ 1 0
17 [PGA2001] ELAIS b4 7302 G 16 04 07.6 +54 17 37           ~ 1 0
18 [PGA2001] ELAIS a4 8242 * 16 04 14.6 +54 25 56           ~ 1 0
19 [PGA2001] ELAIS a4 8655 G 16 04 19.4 +54 27 10           ~ 1 0
20 [PGA2001] ELAIS b4 8696 G 16 04 20.7 +54 16 08           ~ 1 0
21 [PGA2001] ELAIS a4 8942 G 16 04 22.2 +54 27 19           ~ 1 0
22 [PGA2001] ELAIS a4 8934 G 16 04 22.3 +54 27 12           ~ 1 0
23 [PGA2001] ELAIS a4 9041 G 16 04 23.6 +54 27 07           ~ 1 0
24 [PGA2001] ELAIS a4 9381 * 16 04 24.7 +54 27 04           ~ 1 0
25 [PGA2001] ELAIS b4 9146 G 16 04 28.1 +54 13 40           ~ 1 0
26 [PGA2001] ELAIS b4 9528 G 16 04 32.2 +54 22 10           ~ 1 0
27 [PGA2001] ELAIS a4 11748 G 16 04 32.5 +54 30 35           ~ 1 0
28 [PGA2001] ELAIS a4 11185 G 16 04 36.6 +54 36 51           ~ 1 0
29 [PGA2001] ELAIS a4 9989 G 16 04 37.9 +54 34 47           ~ 1 0
30 [PGA2001] ELAIS a4 10732 G 16 04 41.3 +54 34 24           ~ 1 0
31 [PGA2001] ELAIS a3 551 G 16 04 41.4 +54 34 26           ~ 1 0
32 [PGA2001] ELAIS a4 9826 * 16 04 43.3 +54 34 34           ~ 1 0
33 [PGA2001] ELAIS a3 561 G 16 04 43.4 +54 34 36           ~ 1 0
34 [PGA2001] ELAIS a4 9807 G 16 04 49.8 +54 31 51           ~ 1 0
35 [PGA2001] ELAIS b4 11002 G 16 04 51.5 +54 14 37           ~ 1 0
36 [PGA2001] ELAIS a3 1245 G 16 04 52.8 +54 28 09           ~ 1 0
37 [PGA2001] ELAIS a3 1305 * 16 04 53.9 +54 28 23           ~ 1 0
38 [PGA2001] ELAIS a3 1344 * 16 04 54.5 +54 28 17           ~ 1 0
39 [PGA2001] ELAIS b4 11643 G 16 04 58.8 +54 17 01           ~ 1 0
40 [PGA2001] ELAIS b4 11594 G 16 04 59.0 +54 26 34           ~ 1 0
41 [PGA2001] ELAIS b4 11683 G 16 05 00.5 +54 17 01           ~ 1 0
42 [PGA2001] ELAIS a3 2247 G 16 05 06.6 +54 37 59           ~ 1 0
43 ELAIS a4 reg 16 05 12 +54 22.5           ~ 1 0
44 [PGA2001] ELAIS b4 12527 G 16 05 13.1 +54 15 39           ~ 1 0
45 [PGA2001] ELAIS b4 12850 G 16 05 16.6 +54 25 15           ~ 1 0
46 [PGA2001] ELAIS a3 3420 * 16 05 17.9 +54 36 11           ~ 1 0
47 [PGA2001] ELAIS b4 13336 G 16 05 20.5 +54 16 18           ~ 1 0
48 [PGA2001] ELAIS a3 4084 G 16 05 23.9 +54 34 45           ~ 1 0
49 [PGA2001] ELAIS a3 5901 G 16 05 35.1 +54 27 05           ~ 1 0
50 [PGA2001] ELAIS a3 6224 * 16 05 39.8 +54 26 19           ~ 1 0
51 2MASS J16054611+5439094 Sy1 16 05 46.1247474864 +54 39 09.756620712   19.32 18.91     ~ 14 0
52 [PGA2001] ELAIS a3 7003 G 16 05 46.3 +54 37 13           ~ 1 0
53 [PGA2001] ELAIS a3 7224 G 16 05 47.2 +54 25 57           ~ 1 0
54 [PGA2001] ELAIS a3 7605 * 16 05 50.0 +54 38 48           ~ 1 0
55 [PGA2001] ELAIS a3 7836 G 16 05 51.4 +54 32 08           ~ 1 0
56 [PGA2001] ELAIS a3 7930 G 16 05 52.4 +54 33 24           ~ 1 0
57 [PGA2001] ELAIS a3 8412 G 16 05 54.5 +54 38 38           ~ 1 0
58 ELAIS b4 reg 16 05 57 +54 09.6           ~ 1 0
59 [PGA2001] ELAIS b3 13504 G 16 05 59.0 +54 13 41           ~ 1 0
60 [PGA2001] ELAIS a3 10108 * 16 06 00.5 +54 26 53           ~ 1 0
61 [PGA2001] ELAIS a3 8971 G 16 06 03.2 +54 30 28           ~ 1 0
62 [PGA2001] ELAIS a3 9064 G 16 06 03.3 +54 28 11           ~ 1 0
63 [PGA2001] ELAIS a3 8661 G 16 06 07.9 +54 35 42           ~ 1 0
64 [PGA2001] ELAIS b3 14173 G 16 06 10.2 +54 23 43           ~ 1 0
65 [PGA2001] ELAIS a3 9996 * 16 06 12.6 +54 29 42           ~ 1 0
66 [PGA2001] ELAIS b3 14456 G 16 06 13.7 +54 21 49           ~ 1 0
67 [PGA2001] ELAIS a3 10141 G 16 06 18.1 +54 30 59           ~ 1 0
68 [PGA2001] ELAIS b3 14658 G 16 06 18.6 +54 17 10           ~ 1 0
69 [PGA2001] ELAIS a3 9856 G 16 06 20.3 +54 31 50           ~ 1 0
70 [PGA2001] ELAIS a3 9668 * 16 06 20.8 +54 31 50           ~ 1 0
71 [PGA2001] ELAIS b3 14820 G 16 06 20.9 +54 25 30           ~ 1 0
72 ELAIS a3 reg 16 06 42 +54 22.6           ~ 1 0
73 ELAIS b3 reg 16 07 27 +54 09.7           ~ 1 0
74 ELAIS N1 reg 16 10 01 +54 30.6           ~ 489 0

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