2022ApJ...931..121A


Query : 2022ApJ...931..121A

2022ApJ...931..121A - Astrophys. J., 931, 121-121 (2022/June-1)

The CO Emission in the Taffy Galaxies (UGC 12914/15) at 60 pc Resolution. I. The Battle for Star Formation in the Turbulent Taffy Bridge.

APPLETON P.N., EMONTS B., LISENFELD U., FALGARONE E., GUILLARD P., BOULANGER F., BRAINE J., OGLE P., STRUCK C., VOLLMER B. and YEAGER T.

Abstract (from CDS):

We present Atacama Large Millimeter/submillimeter Array observations at a spatial resolution of 0.''2 (60 pc) of CO emission from the Taffy galaxies (UGC 12914/5). The observations are compared with narrowband Paα, mid-IR, radio continuum and X-ray imaging, plus optical spectroscopy. The galaxies have undergone a recent head-on collision, creating a massive gaseous bridge that is known to be highly turbulent. The bridge contains a complex web of narrow molecular filaments and clumps. The majority of the filaments are devoid of star formation, and fall significantly below the Kennicutt-Schmidt relationship for normal galaxies, especially for the numerous regions undetected in Paα emission. Within the loosely connected filaments and clumps of gas we find regions of high velocity dispersion that appear gravitationally unbound for a wide range of likely values of XCO. Like the "Firecracker" region in the Antennae system, they would require extremely high external dynamical or thermal pressure to stop them dissipating rapidly on short crossing timescales of 2-5 Myr. We suggest that the clouds may be transient structures within a highly turbulent multiphase medium that is strongly suppressing star formation. Despite the overall turbulence in the system, stars seem to have formed in compact hotspots within a kiloparsec-sized extragalactic H II region, where the molecular gas has a lower velocity dispersion than elsewhere, and shows evidence for a collision with an ionized gas cloud. Like the shocked gas in the Stephan's Quintet group, the conditions in the Taffy bridge shows how difficult it is to form stars within a turbulent, multiphase, gas.

Abstract Copyright: © 2022. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Interacting galaxies

Status at CDS : Examining the need for a new acronym. // Large table(s) will be appraised for possible ingestion in VizieR.

Simbad objects: 13

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Number of rows : 13
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 UGC 12914 LIN 00 01 38.3220061296 +23 29 01.190922432   13.2       ~ 150 1
2 NAME UGC 12914/5 Bridge PoG 00 01 40 +23 29.3           ~ 6 0
3 NAME Taffy System PaG 00 01 40.12 +23 29 23.0           ~ 56 2
4 CXOU J000140.9+232938 ULX 00 01 40.9 +23 29 38           ~ 1 0
5 UGC 12915 GiP 00 01 41.937 +23 29 45.20   13.9       ~ 120 1
6 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 11043 1
7 BD+52 913 WD* 05 05 30.6180977592 +52 49 51.919301604 10.25 11.44 11.69 11.93 12.108 DA.8 1085 0
8 2MASS J05344881-0533330 TT* 05 34 48.8195453928 -05 33 33.059127996   19.812 18.608 17.09 14.977 M2.5 33 0
9 NAME Antennae IG 12 01 53.170 -18 52 37.92           ~ 1683 0
10 [HV86] 3 PoG 12 01 54.8 -18 52 52           ~ 27 0
11 M 51 Sy2 13 29 52.698 +47 11 42.93   9.26 8.36 8.40   ~ 4306 4
12 ESO 137-1 AG? 16 13 27.305 -60 45 50.59   14.84   13.87   ~ 113 0
13 NAME Stephan's Quintet CGG 22 35 57.5 +33 57 36           ~ 433 1

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