J/A+A/578/A105 EELGs out to z∼1 in zCOSMOS (Amorin+, 2015)
Extreme emission-line galaxies out to z∼1 in zCOSMOS.
I. Sample and characterization of global properties.
Amorin R., Perez-Montero E., Contini T., Vilchez J.M., Bolzonella M.,
Tasca L.A.M., Lamareille F., Zamorani i G., Maier C., Carollo C.M.,
Kneib J.-P., Le Fevre O., Lilly S., Mainieri V., Renzini A., Scodeggio M.,
Bardelli S., Bongiorno A., Caputi K., Cucciati O., de la Torre S.,
de Ravel L., Franzetti P., Garilli B., Iovino A., Kampczyk P.,
Knobel C., Kovac K., Le Borgne J.-F., Le Brun V., Mignoli M., Pello R.,
Peng Y., Presotto V., Ricciardelli E., Silverman J.D., Tanaka M.,
Tresse L., Vergani D., Zucca E. (the zCOSMOS team)
<Astron. Astrophys. 578, A105 (2015)>
=2015A&A...578A.105A 2015A&A...578A.105A
ADC_Keywords: Galaxy catalogs ; Spectroscopy ; Abundances
Keywords: galaxies: evolution - galaxies: fundamental parameters -
galaxies: abundances - galaxies: starbursts - galaxies: irregular -
galaxies: star formation
Abstract:
We present line measurements and physical properties of a sample of
165 extreme emission-line galaxies (EELGs) in the zCOSMOS 20k-Bright
Survey (Lilly et al., 2009, Cat. J/ApJS/184/218). The zCOSMOS spectra
consist of ∼1h integrations in the medium resolution LRRED grism
setting (R∼600 with 2.5Å/pixel), covering a wavelength range
5550<λ<9650Å. Measured emission-line fluxes are given in
units of 10-17erg/s/cm2. Flux errors have been derived following
Perez-Montero et al. (2013A&A...549A..25P 2013A&A...549A..25P) and Amorin et al.
(2012ApJ...749..185A 2012ApJ...749..185A and 2012ApJ...754L..22A 2012ApJ...754L..22A). No extinction
correction has been applied to these fluxes. For each galaxy the
reddening constant, c(Hβ), is presented. These values and their
corresponding uncertainties have been derived from the
Hα/Hβ or Hγ/Hβ ratios, whenever possible. A
reddening constant derived from the SED best-fitting was adopted for
(a) those galaxies where the computation of c(Hβ) from emission
lines is not possible because of the lack of lines, or (b) the
corresponding line ratio produces a negative extinction correction
(i.e., Ha/Hb<2.82 or Hg/Hb<0.47, assuming Case B recombination with
Te=2*10^4K, ne=100cm-3). Stellar mass and 1σ uncertainties
have been obtained from SED fitting (Bolzonella et al.,
2010A&A...524A..76B 2010A&A...524A..76B) after removal of the flux contribution from
strong emission lines.
Description:
Star formation rates have been computed from Hα or Hβ
luminosity (IMF from Chabrier et al. (2003PASP..115..763C 2003PASP..115..763C) and
assuming a theoretical ratio Hα/Hβ=2.82) following
Kennicutt (1998ApJ...498..541K 1998ApJ...498..541K). Uncertainties in SFR account for the
propagation of errors in line fluxes and reddening. Gas-phase
metallicity has been derived using four methods: (1) the direct method
(Hagele et al., 2008MNRAS.383..209H 2008MNRAS.383..209H); (2) the Te-Z correlation (This
work); (3) the N2 calibration (Perez-Montero & Contini,
2009MNRAS.398..949P 2009MNRAS.398..949P); and (4) the R23 calibration (McGaugh,
1991ApJ...380..140M 1991ApJ...380..140M) scaled to the direct method using the linear
relation presented by Lamareille et al. (2006, Cat. J/A+A/448/893 and
2006A&A...448..907L 2006A&A...448..907L, see also Perez-Montero et al.,
2013A&A...549A..25P 2013A&A...549A..25P). In all cases, 1σ uncertainties in
metallicity account for the propagated errors in line fluxes and
reddening.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 141 165 Emission line fluxes and reddening
table2.dat 80 165 Derived physical properties of EELGs in zCOSMOS
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See also:
J/ApJS/184/218 : The zCOSMOS 10k-bright spectroscopic sample (Lilly+, 2009)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- zCOSMOS zCOSMOS ID NUMBER
8- 17 F10.6 deg RAdeg Right ascension (J2000.0)
19- 26 F8.6 deg DEdeg Declination (J2000.0)
28- 32 F5.3 --- z [0.1/1.0] Spectroscopic redshift
34- 39 F6.2 10-20W/m2 F(3727) ?=-9.9 [OII]3727 line flux
41- 44 F4.1 10-20W/m2 e_F(3727) ?=-9.9 error in [OII]3727 line flux
46- 49 F4.1 10-20W/m2 F(Hg) ?=-9.9 Hγ line flux
51- 54 F4.1 10-20W/m2 e_F(Hg) ?=-9.9 error in Hγ line flux
56- 59 F4.1 10-20W/m2 F(4363) ?=-9.9 [OIII]4363 line flux
61- 64 F4.1 10-20W/m2 e_F(4363) ?=-9.9 error in [OIII]4363 line flux
66- 70 F5.2 10-20W/m2 F(Hb) ?=-9.9 Hβ line flux
72- 75 F4.1 10-20W/m2 e_F(Hb) ?=-9.9 error in Hβ line flux
77- 82 F6.2 10-20W/m2 F(4959) ?=-9.9 [OIII]4959 line flux
84- 87 F4.1 10-20W/m2 e_F(4959) ?=-9.9 error in [OIII]4959 line flux
89- 94 F6.2 10-20W/m2 F(5007) ?=-9.9 [OIII]5007 line flux
96- 98 F3.1 10-20W/m2 e_F(5007) ?=-9.9 error in [OIII]5007 line flux
100-105 F6.2 10-20W/m2 F(Ha) ?=-9.9 Hα line flux
107-110 F4.1 10-20W/m2 e_F(Ha) ?=-9.9 error in Hα line flux
112-116 F5.2 10-20W/m2 F(6584) ?=-9.9 [NII]6584 line flux
118-121 F4.1 10-20W/m2 e_F(6584) ?=-9.9 error in [NII]6584 line flux
123-126 F4.1 10-20W/m2 F(6717) ?=-9.9 [SII]6717 line flux
128-131 F4.1 10-20W/m2 e_F(6717) ?=-9.9 error in [SII]6717 line flux
133-136 F4.1 10-20W/m2 F(6730) ?=-9.9 [SII]6730 line flux
138-141 F4.1 10-20W/m2 e_F(6730) ?=-9.9 error in [SII]6730 line flux
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- zCOSMOS zCOSMOS ID number
8 I1 --- MT [1/4] Morphological Type (1)
10- 15 F6.2 mag BMAG ?=-9.9 Rest-frame B-band absolute magnitude
17- 21 F5.2 [Lsun] logLFUV ?=-9.9 Rest-frame, dust corrected,
far-UV (FUV) luminosity
23- 27 F5.2 kpc r50 ?=-9.9 Circularized half-light radius
29- 33 F5.2 [Msun] logMs ?=-9.9 Logarithm of stellar mass (2)
36- 39 F4.2 [Msun] e_logMs ?=-9.9 Uncertainty in stellar mass (3)
41- 46 F6.3 [Msun/yr] logSFR ?=-9.9 Logarithm of star formation rate (4)
47- 51 F5.2 [Msun/yr] e_logSFR ?=-9.9 Uncertainty in log_SFR (5)
54- 57 F4.2 --- c(Hb) ?=-9.9 Reddening constant, c(Hβ)
59- 62 F4.2 --- e_c(Hb) ?=-9.9 error in the reddening constant
64 A1 --- n_c(Hb) [abc] Method for the reddening constant (6)
66- 70 F5.2 --- Ab(O) ?=-9.9 Gas-phase metallicity 12+log(O/H)
72- 76 F5.2 --- e_Ab(O) ?=-9.9 Uncertainty in metallicity (5)
79- 80 I2 --- n_Ab(O) [1/4]?=-9 Method for metallicity (7)
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Note (1): Morphological Type as follows:
1 = Round/nucleated
2 = Clumpy/Chain
3 = Tadpole/cometary
4 = Merger/interacting
Note (2): A Chabrier IMF was adopted.
Note (3): They account for the statistical uncertainties in the SED fitting.
Note (4): It is computed from Hα or Hβ luminosity and adopting the
Kennicutt (1998ApJ...498..541K 1998ApJ...498..541K) calibration (by assuming a Chabrier et al.
(2003PASP..115..763C 2003PASP..115..763C) IMF and a theoretical ratio Hα/Hβ=2.82).
Note (5): 1σ error, it accounts for the propagation of errors in line
fluxes and reddening
Note (6): Method for the reddening constant as follows:
a = from Hα/Hβ
b = from Hγ/Hβ
c = from the SED best-fitting
Note (7): Method for gas-phase metallicity as follows:
1 = Direct (Te) method following Hagele et al. (2008MNRAS.383..209H 2008MNRAS.383..209H)
2 = T(OIII)-Z calibration (This work)
3 = N2 calibration from Perez-Montero & Contini (2009MNRAS.398..949P 2009MNRAS.398..949P)
4 = R23 calibration from McGaugh (1991ApJ...380..140M 1991ApJ...380..140M) scaled to the direct
method using the linear relation presented by Lamareille et al.
(2006, Cat. J/A+A/448/893 and 2006A&A...448..907L 2006A&A...448..907L) (see also
Perez-Montero et al. 2013A&A...549A..25P 2013A&A...549A..25P)
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Acknowledgements:
Ricardo Amorin, ricardo.amorin(at)oa-roma.inaf.it
(End) Patricia Vannier [CDS] 04-Jun-2015