J/A+A/680/A4 IRAM NOEMA CO(1-0) cubes for IC342 (Querejeta+, 2023)
A sensitive, high-resolution, wide-field IRAM NOEMA CO(1-0) survey of the very
nearby spiral galaxy IC 342.
Querejeta M., Pety J., Schruba A., Leroy A. K., Herrera C. N., Chiang I-D.,
Meidt S. E., Rosolowsky E., Schinnerer E., Schuster K., Sun J.,
Herrmann K.A., Barnes A.T., Beslic I., Bigiel F., Cao Y., Chevance M.,
Eibensteiner C., Emsellem E., Faesi C.M., Hughes A., Kim J., Klessen R.S.,
Kreckel K., Kruijssen J.M.D., Liu D., Neumayer N., Pan H.-A., Saito T.,
Sandstrom K., Teng Y.-S., Usero A., Williams T.G., Zakardjian A.
<Astron. Astrophys. 680, A4 (2023)>
=2023A&A...680A...4Q 2023A&A...680A...4Q (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, nearby ; Molecular clouds ; Carbon monoxide ;
Radio lines
Keywords: Galaxy: general - Galaxy: disk - Galaxy: center - stars: formation -
molecular data
Abstract:
We present a new wide-field 10.75x10.75arcmin2 (∼11x11kpc2),
high-resolution (theta=3.6"∼60pc) NOEMA CO(1-0) survey of the
very nearby (d=3.45Mpc) spiral galaxy IC 342. The survey spans out to
about 1.5 effective radii and covers most of the region where
molecular gas dominates the cold interstellar medium. We resolved the
CO emission into >600 individual giant molecular clouds and
associations. We assessed their properties and found that overall the
clouds show approximate virial balance, with typical virial parameters
of alpha_vir=1-2. The typical surface density and line width of
molecular gas increase from the inter-arm region to the arm and bar
region, and they reach their highest values in the inner kiloparsec of
the galaxy (median Sigmamol∼80, 140, 160, and 1100M☉/pc2,
sigmaCO∼6.6, 7.6, 9.7, and 18.4km/s for inter-arm, arm, bar, and
center clouds, respectively). Clouds in the central part of the galaxy
show an enhanced line width relative to their surface densities and
evidence of additional sources of dynamical broadening. All of these
results agree well with studies of clouds in more distant galaxies at
a similar physical resolution. Leveraging our measurements to estimate
the density and gravitational free-fall time at 90pc resolution,
averaged on 1.5kpc hexagonal apertures, we estimate a typical star
formation efficiency per free-fall time of 0.45% with a 16-84%
variation of 0.33-0.71% among such 1.5kpc regions. We speculate that
bar-driven gas inflow could explain the large gas concentration in the
central kiloparsec and the buildup of the massive nuclear star
cluster. This wide-area CO map of the closest face-on massive spiral
galaxy demonstrates the current mapping power of NOEMA and has many
potential applications. The data and products are publicly available
at the IRAM archive.
Description:
We provide two deconvolved CO(1-0) cubes at 5km/s channel spacing,
one for NOEMA+IRAM 30m (short-spacing corrected) and another one for
NOEMA only. We also provide the full tables containing the GMC catalog
(Table A.2) and the table listing the free-fall time and depletion
time measurements (Table A.3). See paper for more details.
Objects:
---------------------------------------------------------
RA (2000) DE Designation(s)
---------------------------------------------------------
03 46 48.50 +68 05 46.9 IC 342 = UGC 2847 = PGC 13826
---------------------------------------------------------
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
tablea2.dat 59 637 Catalog of giant molecular cloud (GMC) properties
tablea3.dat 41 61 Free-fall and depletion time measurements
list.dat 165 2 List of datacubes
fits/* . 2 Individual datacubes
--------------------------------------------------------------------------------
Byte-by-byte Description of file: tablea2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 I3 --- CloudID [0/636] Number of giant molecular cloud (GMC)
from CPROPS
5- 12 F8.5 deg RAdeg Right ascension (J2000)
14- 22 F9.6 deg DEdeg Declination (J2000)
24- 28 F5.1 km/s VLSR Velocity (LSR)
30- 34 F5.1 pc R ?=- Giant molecular cloud (GMC) radius
36- 38 I3 deg PA Giant molecular cloud (GMC) ellipse position
angle
40- 43 F4.2 --- e ?=- Giant molecular cloud (GMC) ellipticity
45- 48 F4.1 km/s sigmaV Giant molecular cloud (GMC) velocity dispersion
50- 54 F5.1 10+6Msun MCO Giant molecular cloud (GMC) luminous mass
56- 59 F4.1 10+6Msun Mvir ?=- Giant molecular cloud (GMC) virial mass
--------------------------------------------------------------------------------
Byte-by-byte Description of file: tablea3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 I2 --- ID [1/61] Aperture number
4- 7 F4.2 kpc Radius Galactocentric radius
9- 15 F7.4 Myr tau-ff Free-fall time
17- 24 F8.4 Msun/pc2 Sigma-mol Molecular gas surface density
26- 33 F8.6 Msun/Myr/pc2 Sigma-SFR Star formation rate surface density
35- 41 F7.2 Myr tau-dep Depletion time
--------------------------------------------------------------------------------
Byte-by-byte Description of file: list.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 9 F9.5 deg RAdeg Right Ascension of center (J2000)
10- 18 F9.5 deg DEdeg Declination of center (J2000)
20- 23 I4 --- Nx Number of pixels along X-axis
25- 28 I4 --- Ny Number of pixels along Y-axis
30- 32 I3 --- Nz Number of slices
34- 37 I4 km/s bVRAD Lower value of VRAD interval
39- 41 I3 km/s BVRAD Upper value of VRAD interval
43 I1 km/s dVRAD VRAD resolution
45- 51 I7 Kibyte size Size of FITS file
53- 67 A15 --- FileName Name of FITS file, in subdirectory fits
69-165 A97 --- Title Title of the FITS file
--------------------------------------------------------------------------------
Acknowledgements:
Miguel Querejeta, m.querejeta(at)oan.es
(End) Patricia Vannier [CDS]: 09-Oct-2023