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.
<Astron. Astrophys. 554, A11 (2013)>
=2013A&A...554A..11C 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 9.4x109M☉, 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:
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FileName Lrecl Records Explanations
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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
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See also:
J/MNRAS/418/244 : SDSS-based Polar Ring Catalogue (Moiseev+, 2011)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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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
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Note (1): Origin of the kinematics:
* SPRC-7 by Brosch et al. (2010MNRAS.401.2067B 2010MNRAS.401.2067B),
* SPRC-33 by Bettoni et al. (2010A&A...519A..72B 2010A&A...519A..72B),
* SPRC-67 by Merkulova et al. (2012AstBu..67..374M 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).
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Byte-by-byte Description of file: spectra.dat
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Bytes Format Units Label Explanations
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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
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Byte-by-byte Description of file: sp/*
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Bytes Format Units Label Explanations
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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
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Acknowledgements:
Francoise Combes, francoise.combes(at)obspm.fr
(End) Francoise Combes [LERMA, France], Patricia Vannier [CDS] 21-Apr-2013