J/A+A/431/793 Ly-alpha emitters around MRC 0316-257 (Venemans+, 2005)
Properties of Ly-alpha emitters around the radio galaxy MRC 0316-257. Venemans B.P., Rottgering H.J.A., Miley G.K., Kurk J.D., De Breuck C., Overzier R.A., van Breugel W.J.M., Carilli C.L., Ford H., Heckman T., Pentericci L., McCarthy P. <Astron. Astrophys. 431, 793 (2005)> =2005A&A...431..793V
ADC_Keywords: Galaxies, radio ; Redshifts ; Photometry Keywords: galaxies: active - galaxies: high-redshift - galaxies: evolution - galaxies: clusters: general - cosmology: observations - cosmology: early Universe Abstract: Observations of the radio galaxy MRC 0316-257 at z=3.13 and the surrounding field resulted in the discovery of 77 candidate Lyα emitters with a rest-frame equivalent width of >15Å. 31 of 40 candidate emitters observed spectroscopically have redshifts similar to that of the radio galaxy. The properties of the Lyα emission line of the 31 confirmed emitters and the radio galaxy are presented in the file table2.dat (Table 2 in the paper). The magnitudes and continuum slopes of these z∼3.1 galaxies are printed in the file table4.dat (Table 4 in the paper). The Lyα galaxies are faint, blue and small, consistent with the emitters being young starforming galaxies which are still nearly dust free. Description: On 2001, September 20 and 21, narrow- and broad-band imaging was carried out with the 8.2m Yepun (VLT UT4) to search for Lyα emitting galaxies around MRC 0316-257. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 147 32 Lyα line properties table4.dat 73 32 Magnitudes and slopes
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 4 A4 --- Seq Object's number in SExtractor catalog (G1) 6- 7 I2 h RAh Right Ascension J2000 (hours) 9- 10 I2 min RAm Right Ascension J2000 (minutes) 12- 16 F5.2 s RAs Right Ascension J2000 (seconds) 18 A1 --- DE- Declination J2000 (sign) 19- 20 I2 deg DEd Declination J2000 (degrees) 22- 23 I2 arcmin DEm Declination J2000 (minutes) 25- 28 F4.1 arcsec DEs Declination J2000 (seconds) 30- 35 F6.4 --- z Redshift 37- 42 F6.4 --- e_z Uncertainty in redshift 44- 47 I4 zW/m2 Flux Lyα line flux (in 10-18erg/s/cm2) 49- 50 I2 zW/m2 e_Flux Uncertainty in line flux 52- 54 I3 0.1nm EW Rest-frame equivalent width of line 56- 59 I4 0.1nm E_EW ? Upper sigma of equivalent width 62- 63 I2 0.1nm e_EW ? Lower sigma of equivalent width 65- 68 I4 km/s FWHM Line full width at half maximum (FWHM) 70- 72 I3 km/s e_FWHM ? Uncertainty in FWHM 74- 77 F4.1 solMass/yr SFR ? Star formation rate based on Lyα 79- 81 F3.1 solMass/yr e_SFR ? Uncertainty in SFR 83-147 A65 --- Notes Notes on individual objects
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 4 A4 --- Seq Object's number in SExtractor catalog (G1) 6- 10 F5.2 mag NBmag Narrow-band (5045Å) magnitude 12- 15 F4.2 mag e_NBmag Uncertainty in NBmag 17- 21 F5.2 mag Vmag V magnitude (1) 23- 26 F4.2 mag e_Vmag ? Uncertainty in Vmag (1) 28- 32 F5.2 mag Imag ? I magnitude (1) 34- 37 F4.2 mag e_Imag ? Uncertainty in Imag (1) 39- 43 F5.2 mag I814mag ? ACS I814 magnitude 45- 48 F4.2 mag e_I814mag ? Uncertainty in I814mag 50- 54 F5.2 --- beta ? UV continuum slope beta (2) 56- 59 F4.2 --- e_beta ? Uncertainty in beta (2) 61- 65 F5.2 --- betaACS ? UV continuum slope using ACS mag (2) 67- 70 F4.2 --- e_betaACS ? Uncertainty in betaACS (2) 72 A1 --- Note Notes on individual objects (3)
Note (1): If no error is given for the V or I magnitude, then the object was not detected in that band, and the magnitude given is a 2 sigma lower limit. Note (2): The slope, beta, of the UV continuum is defined as f(λ) ∝ λβ. If no error is given for the slope beta, then the value of the slope is a 2 sigma limit. Note (3): Notes mean the following: A = Photometry unreliable due to nearby bright star. B = Undetected in ACS image, I814mag > 27.1 mag/arcsec2. C = Resolved by HST into several components. D = Photometry influenced by nearby object.
Global notes: Note (G1): HzRG is the high redshift radio galaxy.
Acknowledgements: Bram Venemans, venemans(at)strw.leidenuniv.nl
(End) Bram Venemans [Leiden Obs.], Patricia Vannier [CDS] 12-Nov-2004
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