J/A+A/629/A30 ALMA CO observations of the system 4C12.50 (Fotopoulou+, 2019)
Complex molecular gas kinematics in the inner 5 kpc of 4C12.50 as seen by ALMA.
Fotopoulou C.M., Dasyra K.M., Combes F., Salome P., Papachristou M.
<Astron. Astrophys. 629, A30 (2019)>
=2019A&A...629A..30F 2019A&A...629A..30F (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, radio ; Interstellar medium ; Carbon monoxide
Keywords: ISM: jets and outflows - ISM: kinematics and dynamics -
line: profiles - galaxies: active - galaxies: nuclei -
infrared: galaxies
Abstract:
The nearby system 4C12.50, also known as IRAS 13451+1217 and
PKS 1345+12, is a merger of gas-rich galaxies with infrared and radio
activity. It has a perturbed interstellar medium (ISM) and a dense
configuration of gas and dust around the nucleus. The radio emission
at small (∼100pc) and large (∼100kpc) scales, as well as the large
X-ray cavity in which the system is embedded, are indicative of a jet
that could have affected the ISM. We carried out observations of the
CO(1-0), (3-2), and (4-3) lines with the Atacama Large Millimeter
Array (ALMA) to determine basic properties (i.e., extent, mass, and
excitation) of the cold molecular gas in this system, including its
already-known wind. The CO emission reveals the presence of gaseous
streams related to the merger, which result in a small (4kpc-wide)
disk around the western nucleus. The disk reaches a rotational
velocity of 200km/s, and has a mass of 3.8(±0.4)109M☉. It is
truncated at a gaseous ridge north of the nucleus that is bright in
[OIII]. Regions with high-velocity CO emission are seen at
signal-to-noise ratios of between 3 and 5 along filaments that
radially extend from the nucleus to the ridge and that are bright in
[O iii] and stellar emission. A tentative wind detection is also
reported in the nucleus and in the disk. The molecular gas speed could
be as high as 2200km/s and the total wind mass could be as high as
1.5(±0.1)109M☉. Energetically, it is possible that the jet,
assisted by the radiation pressure of the active nucleus or the stars,
accelerated clouds inside an expanding bubble.
Description:
Millimeter interferometric observations of the CO(1-0), CO(3-2),
CO(4-3) lines with the Atacama Large Millimeter Array (ALMA) of the
system 4C12.50 (also known as IRAS 13451+1217 and PKS 1345+12). The
observations were carried out by the ALMA cycle 2 program
2013.1.00180.S (PI Dasyra)in bands 3, 7 and 8. All data listed below
come from the program 2013.1.00180.S, except for those with the
indication "deep" in their names. These were created by merging the
data of the program 2013.1.00180.S with archival observations of other
programs that used 4C12.50 as a calibrator, in order to create the
deepest possible cubes for each line.
Additionally, H2O(4-3) and HCO+(5-4) lines were detected in band 8
(2013.1.00180.S).
Objects:
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RA (2000) DE Designation(s)
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13 47 33.36 +12 17 24.2 4C12.50 = PKS 1345+12
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 177 10 List of datacubes
fits/* . 10 Individual datacubes
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Byte-by-byte Description of file: list.dat
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Bytes Format Units Label Explanations
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1- 9 F9.5 deg RAdeg Right Ascension of center (J2000)
10- 18 F9.5 deg DEdeg Declination of center (J2000)
20- 22 I3 --- Nx Number of pixels along X-axis
24- 26 I3 --- Ny Number of pixels along Y-axis
28- 30 I3 --- Nz Number of slices
32- 54 A23 "datime" Obs.date Observation date
56- 64 F9.3 km/s bVRAD Lower value of VRAD interval
66- 73 F8.3 km/s BVRAD Upper value of VRAD interval
75- 77 I3 km/s dVRAD VRAD resolution
79- 83 I5 Kibyte size Size of FITS file
85- 97 A13 --- FileName Name of FITS file, in subdirectory fits
99-177 A79 --- Title Title of the FITS file
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Acknowledgements:
Constantina M. Fotopoulou, constant(at)mpa-garching.mpg.de
(End) Patricia Vannier [CDS] 19-Aug-2019