J/A+A/556/A10 Multiband surface photometry of 21 BCGs (Micheva+ 2013) ================================================================================ Deep multiband surface photometry on a sample of 24 blue compact galaxies. II. A volume-limited sample of 21 emission line galaxies Micheva G., Ostlin G., Zackrisson E., Bergvall N., Marquart T., Masegosa J., Marquez I., Cumming R.J., Durret F. =2013A&A...556A..10M ================================================================================ ADC_Keywords: Galaxies, photometry ; Photometry, UBVRI ; Photometry, infrared Keywords: galaxies: photometry - galaxies: starburst - galaxies: dwarf - galaxies: irregular Abstract: We present deep surface photometry of a volume-limited sample of 21 UM emission line galaxies in broadband optical UBVRI and near infra-red (NIR) HKs filters. The sample comprises 19 blue compact galaxies (BCGs) and two spirals. For some targets the exposure times are the deepest to date. For the BCG UM462 we observe a previously undetected second disk component beyond a surface brightness level of mu_B_=26mag/arcsec^2^. This is a true low surface brightness component with central surface brightness mu_0_=24.1mag/arcsec^2^ and scale length h_r_=1.5kpc. All BCGs are dwarfs, with M_B_>=-18, and very compact, with an average scale length of h_r_~1kpc. We separate the burst and host populations for each galaxy and compare them to stellar evolutionary models with and without nebular emission contribution. We also measure the A_180_ asymmetry in all filters and detect a shift from optical to NIR in the average asymmetry of the sample. This shift seems to be correlated with the morphological class of the BCGs. Using the color-asymmetry relation, we identify five BCGs in the sample as mergers, which is confirmed by their morphological class. Though clearly separated from normal galaxies in the concentration-asymmetry parameter space, we find that it is not possible to distinguish luminous starbursting BCGs from the merely star forming low luminosity BCGs. Description: The data consist of optical and NIR broadband imaging (UBVRIHKs), obtained during the period 2003-2007 with ALFOSC (at the Nordic Optical Telescope, NOT, La Palma), MOSCA (NOT), and EMMI (at the European Southern Observatory New Technology Telescope, ESO NTT, La Silla) in the optical, and with NOTCAM (NOT) and SOFI (ESO NTT) in the NIR. Very deep observations are of a volume-limited sample of 21 Blue Compact Galaxies (Emission line galaxies). The images are reduced (bias correction, flatfielding, normalized, aligned, skysubtracted). Calibration to the Vega photometric system in the optical based on Landolt standard stars; in the NIR on 2MASS field stars found in each frame. Total exposure time (seconds) in each filter and galaxy is included in each FITS header as TOTALTIM. Cosmic rays have not been removed. File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file table1.dat 30 20 Total integration times for the sample table2.dat 75 89 Log of the observations list.dat 69 127 FITS files summary in fits directory fits/* 0 127 Individual FITS images -------------------------------------------------------------------------------- See also: VII/171 : Michigan Emission-Line Objects (MacAlpine+ 1977-1982) J/ApJ/668/853 : Spectroscopy of UltraStrong EmL galaxies (Kakazu+, 2007) 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/ApJS/156/345 : Surface photometry of BCD galaxies (Gil De Paz+, 2005) J/ApJS/147/29 : BRHa data of blue compact dwarf galaxies (Gil De Paz+, 2003) J/A+A/397/463 : The Hamburg/SAO Survey for BCGs. I. (Ugryumov+, 2003) J/A+A/373/24 : Blue compact galaxies from SBS (Pustilnik+ 2001) Byte-by-byte Description of file: table1.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 2 A2 --- --- [UM] 3- 5 I3 --- UM [422/559] UM galaxy name (1) 7- 8 I2 min Uexp ? Total integration time for the U-band (2) 10- 11 I2 min Bexp Total integration time for the B-band (2) 13- 14 I2 min Vexp Total integration time for the V-band (2) 16- 17 I2 min Rexp ? Total integration time for the R-band (2) 18 A1 --- f_Rexp [d] d: NOT/ALFOSC 20- 22 I3 min Iexp ? Total integration time for the I-band (2) 24- 25 I2 min Hexp ? Total integration time for the H-band (2) 27- 29 I3 min Ksexp Total integration time for the Ks-band (2) 30 A1 --- f_Ksexp [e] e: NTT/SOFI -------------------------------------------------------------------------------- Note (1): UM523 is actually a pair of galaxies, UM523 A and UM523 B, which are merging and are very close together. So they happen to be on the same image. But they are in the early stages of contact so they're still clearly distinguishable as separate galaxies. Note (2): All times are given in minutes and converted to the frame-work of a 2.56 meter telescope where needed. The values are for observations in a single filter, e.g. only SOFI Ks, and not SOFI Ks + NOTCAM Ks. -------------------------------------------------------------------------------- Byte-by-byte Description of file: table2.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 2 A2 --- --- [UM] 3- 5 I3 --- UM [422/559] UM galaxy name 7- 8 I2 h RAh Hour of right ascension (J2000) 9- 10 I2 min RAm Minute of right ascension (J2000) 11- 14 F4.1 s RAs Second of right ascension (J2000) 16 A1 --- DE- Sign of declination (J2000) 17- 18 I2 deg DEd Degree of declination (J2000) 19- 20 I2 arcmin DEm Arcminute of declination (J2000) 21- 22 I2 arcsec DEs Arcsecond of declination (J2000) 24- 31 F8.6 --- z NED heliocentric redshift 33- 36 F4.1 Mpc Dist NED heliocentric distance 38- 41 I4 --- Year Year of the observation 43- 53 A11 --- Inst Instrument 55 A1 --- F1 First filter (U B R I H K) 57- 59 I3 --- NF1 F1 number at the respective observatory 61 A1 --- F2 Second filter (B V I) 63- 65 I3 --- NF2 ? F2 number at the respective observatory 67 A1 --- F3 Third filter (V R) 69- 70 I2 --- NF3 ? F3 number at the respective observatory 72 A1 --- F4 Fourth filter (R) 74- 75 I2 --- NF4 ? F4 number at the respective observatory -------------------------------------------------------------------------------- Byte-by-byte Description of file: list.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 2 A2 --- --- [UM] 3- 5 I3 --- UM [422/559] UM galaxy name 7- 15 F9.5 deg RAdeg Right Ascension of center (J2000) 16- 24 F9.5 deg DEdeg Declination of center (J2000) 26- 30 F5.3 arcsec/pix scale Scale of the image 32- 35 I4 pix Nx Number of pixels along X-axis 36 A1 --- --- [x] 37- 40 I4 pix Ny Number of pixels along Y-axis 43- 46 I4 s Exp Exposure time 49- 50 A2 --- Filt Filter (U, B, V, R, I, H, Ks) 52- 54 A3 --- Tel Telescope (ESO or NOT) 56- 69 A14 --- FileName Name of FITS file in subdirectory fits -------------------------------------------------------------------------------- Acknowledgements: Genoveva Micheva: genoveva{at}astro.su.se References: Micheva et al. Paper I. 2013MNRAS.431..102M ================================================================================ (End) Genoveva Micheva [Stockholm univ.], Emmanuelle Perret [CDS] 03-Jul-2013