J/A+A/554/A11 CO observations of polar ring galaxies (Combes+, 2013) ================================================================================ Molecular content of polar ring galaxies. Combes F., Moiseev A., Reshetnikov V. =2013A&A...554A..11C ================================================================================ ADC_Keywords: Galaxies, peculiar - Galaxies, radio - Galaxies, spectra Keywords: galaxies: evolution - galaxies: general - galaxies: halos - galaxies: ISM - radio lines: galaxies Abstract: We have searched for CO lines in a sample of 21 new morphologically determined polar ring galaxies (of which 9 are kinematically confirmed), obtained from a wide search in the Galaxy Zoo project by Moiseev and collaborators. Polar ring galaxies (PRG) are a unique class of objects, tracing special episodes in the galaxy mass assembly: they could be formed through galaxy interaction, merging, but also through accretion from cosmic filaments. Beside, they enable the study of dark matter haloes in 3 dimensions. The polar ring itself is a sub-system rich in gas, where molecular gas is expected, and new stars are formed. Among the sample of 21 PRG, we have detected five CO-rich systems, that can now be followed up with higher spatial resolution. Their average molecular mass is 9.4x10^9^M_{sun}_, and their average gas fraction is 27% of their baryonic mass, with a range from 15 to 43%, implying that they just accreted a large amount of gas. The position of the detected objects in the velocity- magnitude diagram is offset from the Tully-Fisher relation of normal spirals, as was already found for PRG. This work is part of our multi-wavelength project to determine the detailed morphology and dynamics of Polar-Ring galaxies, test through numerical models their formation scenario, and deduce their dark matter content and 3D-shape. Description: 10 reduced spectra obtained at IRAM-30m are provided in ascii format. They are presented in Figure 2, 3 and Table 2 of the article. File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file table1.dat 79 21 Basic data for the polar ring galaxy sample, and sizes of the regions observed in CO(1-0) and CO(2-1) spectra.dat 37 10 Source, line and central velocity of spectrum sp/* . 10 Individual spectra -------------------------------------------------------------------------------- See also: J/MNRAS/418/244 : SDSS-based Polar Ring Catalogue (Moiseev+, 2011) Byte-by-byte Description of file: table1.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 3 I3 --- SPRC [7/260] SPRC number (Cat. J/MNRAS/418/244) 4 A1 --- n_SPRC [C] C for kinematically confirmed (1) 6- 19 A14 --- Name Galaxy name 21- 22 I2 h RAh Right ascension (J2000) 24- 25 I2 min RAm Right ascension (J2000) 27- 31 F5.2 s RAs Right ascension (J2000) 33 A1 --- DE- Declination sign (J2000) 34- 35 I2 deg DEd Declination (J2000) 37- 38 I2 arcmin DEm Declination (J2000) 40- 43 F4.1 arcsec DEs Declination (J2000) 45- 49 I5 km/s cz Heliocentric radial velocity (cz) 51- 55 F5.2 mag gmag SDSS g magnitude 57- 61 F5.2 mag rmag SDSS r magnitude 63- 67 F5.2 mag imag SDSS i magnitude 69- 72 F4.1 kpc beam10 Size of the region observed in CO(1-0) 74- 77 F4.1 kpc beam21 Size of the region observed in CO(2-1) 79 A1 --- sp [*] * indicates spectra in subdirectory sp -------------------------------------------------------------------------------- Note (1): Origin of the kinematics: * SPRC-7 by Brosch et al. (2010MNRAS.401.2067B), * SPRC-33 by Bettoni et al. (2010A&A...519A..72B), * SPRC-67 by Merkulova et al. (2012AstBu..67..374M), * SPRC-10, 14, 39, 60 and 69 by Moiseev et al. (2011, Cat. J/MNRAS/418/244), * SPRC-260, by Khoperskov et al. (2012, EWASS in press). -------------------------------------------------------------------------------- Byte-by-byte Description of file: spectra.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 2- 3 I2 --- Nsp Spectrum number 5- 8 A4 --- --- [SPRC] 9- 11 I3 --- SPRC SPRC identification of galaxy 13- 19 A7 --- Line Line, CO(1-0) or CO(2-1) 21- 26 F6.0 km/s Vsys Systemic velocity, i.e. spectrum center 28- 37 A10 --- FileName Name of the file with spectrum in subdirectory sp -------------------------------------------------------------------------------- Byte-by-byte Description of file: sp/* -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 3- 9 F7.2 km/s Vel Velocity with respect to Vsys in spectra.dat file 12- 20 F9.6 mK Tmb Main beam temperature -------------------------------------------------------------------------------- Acknowledgements: Francoise Combes, francoise.combes(at)obspm.fr ================================================================================ (End) Francoise Combes [LERMA, France], Patricia Vannier [CDS] 21-Apr-2013