J/ApJ/677/169 Hα galaxies at z=0.84 (Villar+, 2008)
The Hα-based star formation rate density of the universe at z=0.84.
Villar V., Gallego J., Perez-Gonzalez P.G., Pascual S., Noeske K.,
Koo D.C., Barro G., Zamorano J.
<Astrophys. J., 677, 169-185 (2008)>
=2008ApJ...677..169V 2008ApJ...677..169V
ADC_Keywords: Equivalent widths ; Extinction ; Photometry, infrared ;
Galaxies, IR
Keywords: galaxies: evolution - galaxies: luminosity function, mass function -
galaxies: starburst
Abstract:
We present the results of an Hα near-infrared narrowband survey
searching for star-forming galaxies at redshift z=0.84. This work is
an extension of our previous narrowband studies in the optical at
lower redshifts. After removal of stars and redshift interlopers
(using spectroscopic and photometric redshifts), we build a complete
sample of 165 Hα emitters in the extended Groth strip and
GOODS-N fields with L(Hα)>1041ergs/s. We compute the Hα
luminosity function at z=0.84 after corrections for [NII] flux
contamination, extinction, systematic errors, and incompleteness. Our
sources present an average dust extinction of A(Hα)=1.5mag.
Adopting Hα as a surrogate for the instantaneous SFR, we measure
an extinction-corrected SFR density of 0.17+0.03-0.03M☉/yr/Mpc3.
Combining this result to our prior measurements at z=0.02, 0.24, and
0.40, we derive an Hα-based evolution of the SFR density
proportional to (1+z)β with β=3.8±0.5. This evolution is
consistent with that derived by other authors using different SFR
tracers.
Description:
The survey was carried out with the NIR camera OMEGA-2000 on the 3.5m
telescope at the Calar Alto Observatory (Almeria, Spain) with the
J and narrowband filters. Three different 15'x15' pointings were
obtained, two in the extended Groth strip (EGS) and another one in the
GOODS-North (GOODS-N) field, in 2005 April and 2006 May.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 68 157 Observed sample
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See also:
J/ApJS/95/387 : Universidad Complutense de Madrid list 1 (Zamorano+ 1994)
J/ApJS/105/343 : Universidad Complutense de Madrid list 2 (Zamorano+ 1996)
J/A+A/379/798 : ELAIS Hα emitting galaxies (Pascual+, 2001)
J/ApJS/177/431 : Mid-IR sources in EGS (Barmby+, 2008)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 7 A7 --- Name Source identification (<[VGP2008] aN-NNNN>
in Simbad)
9- 17 F9.5 deg RAdeg Right ascension in decimal degrees (J2000)
19- 26 F8.5 deg DEdeg Declination in decimal degrees (J2000)
28- 32 F5.2 mag Jmag J-band magnitude (Vega)
34- 37 F4.2 mag e_Jmag Jmag uncertainty
39- 42 F4.1 10-20W/m2 fHalpha Hα line flux in 10-17ergs/s/cm2
44- 47 F4.1 10-20W/m2 e_fHalpha fHalpha uncertainty
49- 52 I4 0.1nm EWHa Hα rest-frame equivalent width
54- 57 F4.2 mag AHa Hα extinction
59- 62 F4.1 solMass/yr SFRobs Star Formation Rate observed
64- 68 F5.1 solMass/yr SFRcor Star Formation Rate corrected for extinction
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History:
From electronic version of the journal
(End) Emmanuelle Perret [CDS] 15-Sep-2010