J/ApJ/708/1076 The WHIQII survey: compact blue galaxies (Tollerud+, 2010)
The WHIQII survey: metallicities and spectroscopic properties of luminous compact blue galaxies. Tollerud E.J., Barton E.J., van Zee L., Cooke J. <Astrophys. J., 708, 1076-1091 (2010)> =2010ApJ...708.1076T
ADC_Keywords: Galaxies, spectra ; Abundances ; Redshifts ; Equivalent widths Keywords: galaxies: abundances - galaxies: evolution - galaxies: high-redshift - galaxies: starburst Abstract: As part of the WIYN High Image Quality Indiana-Irvine (WHIQII) survey, we present 123 spectra of faint emission-line galaxies, selected to focus on intermediate redshift (0.4≲z≲0.8) galaxies with blue colors that appear physically compact on the sky. The sample includes 15 true Luminous Compact Blue Galaxies (LCBGs) and an additional 27 slightly less extreme emission-line systems. These galaxies represent a highly evolving class that may play an important role in the decline of star formation since z∼1, but their exact nature and evolutionary pathways remain a mystery. Here, we use emission lines to determine metallicities and ionization parameters, constraining their intrinsic properties and state of star formation. Some LCBG metallicities are consistent with a "bursting dwarf" scenario, while a substantial fraction of others are not, further confirming that LCBGs are a highly heterogeneous population but are broadly consistent with the intermediate redshift field. In agreement with previous studies, we observe overall evolution in the luminosity-metallicity relation at intermediate redshift. Our sample, and particularly the LCBGs, occupies a region in the empirical R23-O32 plane that differs from luminous local galaxies and is more consistent with dwarf irregulars at the present epoch, suggesting that cosmic "downsizing" is observable in even the most fundamental parameters that describe star formation. Description: The WIYN High Image Quality Indiana-Irvine (WHIQII) survey aims to address the question of the evolutionary paths of Luminous Compact Blue Galaxies (LCBGs) by examining the metallicities of a large sample derived using the strong [OII]3727, [OIII]5007, [OIII]4959, and Hβ lines; primarily through the use of the R23=([OII]3727+[OIII]4959,5007)/Hβ and O32=[OIII]4959,5007/[OII]3727 indicators. The BVRI imaging data for WHIQII was obtained from observations using the Mini-Mosaic Imager (MiniMo) on the WIYN 3.5 m telescope over 25 nights from 2001 to 2004. Spectroscopic observations of 213 targets were taken on the nights of 2005 February 11 and 2005 August 3-4 with the dual-channel Low Resolution Imaging Spectrometer (LRIS) on the Keck I telescope. Of the 213 spectra taken, 168 show strong enough spectral features to be assigned a redshift, and 123 have unambiguous emission lines. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 75 168 WIYN High Image Quality Indiana-Irvine (WHIQII): photometric properties of objects with redshifts table2.dat 63 168 WIYN High Image Quality Indiana-Irvine (WHIQII): emission line ratios of objects with redshifts
See also: J/A+A/429/115 : JHK' photometry of Blue Compact Dwarf Galaxies (Noeske+, 2005) J/A+A/434/887 : HI data of blue compact dwarf galaxies (Huchtmeier+, 2005) J/A+A/425/417 : Star formation rates of blue compact galaxies (Kong+, 2004) J/ApJS/147/29 : BRHalpha data of blue compact dwarf galaxies (Gil De Paz+, 2003) J/A+A/396/503 : Spectra of blue compact galaxies (Kong+, 2002) J/A+A/373/24 : Blue compact galaxies from SBS (Pustilnik+ 2001) J/A+AS/137/419 : Dynamics of blue compact galaxies I. The data (Oestlin + 1999) J/ApJ/511/639 : Abundances in blue compact galaxies (Izotov+, 1999) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 5 I5 --- WHIQII The WHIQII object number 7- 8 I2 h RAh Hour of Right Ascension (J2000) 10- 11 I2 min RAm Minute of Right Ascension (J2000) 13- 17 F5.2 s RAs Second of Right Ascension (J2000) 19 A1 --- DE- Sign of the Declination (J2000) 20- 21 I2 deg DEd Degree of Declination (J2000) 23- 24 I2 arcmin DEm Arcminute of Declination (J2000) 26- 30 F5.2 arcsec DEs Arcsecond of Declination (J2000) 32- 36 F5.1 mag BMag K-corrected B band absolute magnitude 38- 40 F3.1 mag e_BMag Uncertainty in BMag 42- 44 F3.1 mag B-V K-corrected (B-V) color index 46- 48 F3.1 mag e_B-V Uncertainty in B-V 50- 56 E7.2 Msun Mstar Stellar mass (1) 58- 61 F4.1 kpc rh Half-light radius 63- 68 F6.4 --- z Redshift from spectrum 70- 75 F6.4 --- e_z Uncertainty in z
Note (1): As determined from the mean of the BVRI bands using the Bell & de Jong (2001ApJ...550..212B) M/L relations.
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 5 I5 --- WHIQII The WHIQII object number 7- 11 F5.1 --- R23 ? The ([OII]3727+[OIII]4959,5007)/Hβ line flux ratio 13- 17 F5.1 --- e_R23 ? Uncertainty in R23 19- 22 F4.1 --- O23 ? The [OIII]4959,5007/[OII]3727 line flux ratio 24- 26 F3.1 --- e_O23 ? Uncertainty in O23 28- 31 F4.1 [-] O/H ? Oxygen abundance; log(O/H)+12 (2) 33- 35 F3.1 [-] e_O/H ? Uncertainty in O/H 37- 40 F4.1 --- REW ? The ([OII]3727+[OIII]4959,5007)/Hβ equivalent width ratio 42- 44 F3.1 --- e_REW ? Uncertainty in REW 46- 49 F4.1 --- OEW ? The [OIII]4959,5007/[OII]3727 equivalent width ratio 51- 53 F3.1 --- e_OEW ? Uncertainty in OEW 55- 59 F5.1 [-] O/HEW ? Oxygen abundance from equivalent width; log(O/H)+12 (2) 61- 63 F3.1 [-] e_O/HEW ? Uncertainty in O/HEW
Note (2): From Kewley & Dopita (2002ApJS..142...35K) calibration.
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 21-Feb-2012
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