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J/ApJ/647/128     Hα observations of UV-selected galaxies      (Erb, 2006)

Hα observations of a large sample of galaxies at z∼2: implications for star formation in high-redshift galaxies. Erb D.K. <Astrophys. J. 647, 128 (2006)> =2006ApJ...647..128E
ADC_Keywords: Galaxies, spectra ; Photometry, ultraviolet ; Photometry, H-alpha Keywords: galaxies: evolution - galaxies: high-redshift - stars: formation Abstract: Using Halpha spectra of 114 rest-frame UV-selected galaxies at z∼2, we compare inferred star formation rates (SFRs) with those determined from the UV continuum luminosity. After correcting for extinction using standard techniques based on the UV continuum slope, we find excellent agreement between the indicators, with <SFRHa≥31M/yr and <SFRUV≥29M/yr. The agreement between the indicators suggests that the UV luminosity is attenuated by a typical factor of ∼4.5 (ranging from no attenuation to a factor of 100 for the most obscured object in the sample), in good agreement with estimates of obscuration from X-ray, radio, and mid-IR data. Description: The selection of the sample and our observing and data reduction procedures are described in detail by Erb et al. (2006ApJ...646..107E). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file position.dat 37 114 Galaxies position (from Erb et al., 2006ApJ...646..107E) table1.dat 74 114 Star formation rates
See also: J/MNRAS/300/303 : UV-selected galaxy redshift survey (Treyer+, 1998) J/ApJS/122/109 : Galaxy structural parameters (Takamiya+, 1999) J/ApJ/549/820 : Hα flux of ACCG 114 galaxies (Couch+, 2001) J/A+A/379/798 : ELAIS Hα emitting galaxies (Pascual+, 2001) J/ApJ/586/794 : Multiwavelength luminosities of galaxies (Bell, 2003) J/AJ/127/2002 : Star Formation Rate of NFGS galaxies (Kewley+, 2004) J/A+A/425/417 : Star formation rates of blue compact galaxies (Kong+, 2004) J/ApJ/604/141 : Hα fluxes in Cl J0023+0423B galaxies (Finn+, 2004) J/ApJ/630/206 : Hα data for 3 EDisCS galaxy clusters (Finn+, 2005) J/PASP/117/227 : Properties of 101 galaxies from the NFGS (Kewley+, 2005) Byte-by-byte Description of file: position.dat
Bytes Format Units Label Explanations
1- 12 A12 --- Name Object name 14- 15 I2 h RAh Right ascension (J2000) 17- 18 I2 min RAm Right ascension (J2000) 20- 24 F5.2 s RAs Right ascension (J2000) 26 A1 --- DE- Declination sign (J2000) 27- 28 I2 deg DEd Declination (J2000) 30- 31 I2 arcmin DEm Declination (J2000) 33- 37 F5.2 arcsec DEs Declination (J2000)
Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 12 A12 --- Name Object name 14 A1 --- n_Name [l] AGN (1) 16- 22 F7.5 --- z Redshift from Hα line 24- 28 F5.3 mag E(B-V) The E(B-V) extinction (2) 30- 33 F4.1 10-20W/m2 FHa Observed Hα emission line flux in units of 10-17erg/s/cm2 35- 37 F3.1 10+35W LHa Observed Hα luminosity in units of 1042erg/s 39- 40 I2 solMass/yr SFR0 Uncorrected SFR from Hα flux (3) 42- 44 I3 solMass/yr SFR1 SFR from Hα flux (4) 46- 50 F5.2 mag F1500 Observed 1500 Angstrom magnitude (5) 52- 56 F5.2 [mW/m2/Hz] L1500 Log of the 1500 Angstrom rest frame luminosity in units of erg/s/cm2/Hz 58- 59 I2 solMass/yr USFR0 Uncorrected SFR from UV magnitude 61- 63 I3 solMass/yr USFR1 SFR from extinction-corrected UV magnitude 65- 67 I3 solMass/yr SFR ? The SFR from SED fitting 69- 72 I4 0.1nm WHa ? Rest frame Hα equivalent width in Angstroms (6) 74 A1 --- n_WHa [m] Aperture correction not applied (7)
Note (1): l = AGN, as determined from rest-frame UV or optical spectra Note (2): Inferred from SED fitting when K-band photometry is present (indicated by a value in SFRfit), and calculated from the G-R color index assuming an SED with constant star formation and an age of 570Myr otherwise. Note (3): Uncorrected for extinction and applying a factor of two aperture correction. Note (4): After correcting for extinction and slit losses. Note (5): G-band for most objects, Un for those with z∼1.5. Note (6): Incorporating a factor of two aperture correction except where noted. Note (7): m = Aperture correction not applied for equivalent width calculation
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 17-Jun-2008
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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