2017ApJ...834....6S


Query : 2017ApJ...834....6S

2017ApJ...834....6S - Astrophys. J., 834, 6-6 (2017/January-1)

Merger-induced shocks in the nearby LIRG VV 114 through methanol observations with ALMA.

SAITO T., IONO D., ESPADA D., NAKANISHI K., UEDA J., SUGAI H., TAKANO S., YUN M.S., IMANISHI M., OHASHI S., LEE M., HAGIWARA Y., MOTOHARA K. and KAWABE R.

Abstract (from CDS):

We report the detection of two CH3OH lines (JK = 2K-1K and 3K-2K) between the progenitor's disks ("Overlap") of the mid-stage merging galaxy VV 114 obtained using the Atacama Large Millimeter/submillimeter Array (ALMA) Band 3 and Band 4. The detected CH3OH emission shows an extended filamentary structure (∼3 kpc) across the progenitor's disks with relatively large velocity width (FWZI ∼ 150 km s–1). The emission is only significant in the "overlap" and not detected in the two merging nuclei. Assuming optically thin emission and local thermodynamic equilibrium, we found the CH3OH column density relative to H2 (XCH3OH_) peaks at the "Overlap" (∼8 x 10–9), which is almost an order of magnitude larger than that at the eastern nucleus. We suggest that kpc-scale shocks driven by galaxy-galaxy collision may play an important role to enhance the CH3OH abundance at the "Overlap." This scenario is consistent with shock-induced large velocity dispersion components of ionized gas that have been detected in optical wavelength at the same region. Conversely, low XCH3OH_ at the nuclear regions might be attributed to the strong photodissociation by nuclear starbursts and/or a putative active galactic nucleus, or inefficient production of CH3OH on dust grains due to initial high-temperature conditions (i.e., desorption of the precursor molecule, CO, into gas phase before forming CH3OH on dust grains). These ALMA observations demonstrate that CH3OH is a unique tool to address kpc-scale shock-induced gas dynamics and star formation in merging galaxies.

Abstract Copyright: © 2016. The American Astronomical Society. All rights reserved.

Journal keyword(s): galaxies: individual: (VV 114, IC 1623, Arp 236) - galaxies: interactions - radio lines: galaxies - radio lines: galaxies

Simbad objects: 14

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Number of rows : 14
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 NGC 253 SyG 00 47 33.134 -25 17 19.68   8.03   6.94 8.1 ~ 3077 2
2 IC 1623 IG 01 07 47.2 -17 30 25   15       ~ 272 1
3 QSO B0108-079 QSO 01 10 50.0209874 -07 41 41.114074   19.0 19.0 19.21   ~ 54 1
4 PKS 0114-21 rG 01 16 51.56103995 -20 52 10.8021857     16.5     ~ 76 1
5 ICRF J013738.3-243053 Sy1 01 37 38.3465008708 -24 30 53.881956849   17.47 17.33 16.57   ~ 184 1
6 IC 342 SBG 03 46 48.514 +68 05 45.98   10.5       ~ 1431 1
7 NGC 1614 AGN 04 34 00.027 -08 34 44.57   14.66 13.99     ~ 624 0
8 NAME OMC-1 MoC 05 35 14 -05 22.4           ~ 1080 2
9 [WZM2000] MMS 3 mm 06 41 12.3 +09 29 12           ~ 30 0
10 M 82 IG 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 5522 6
11 M 51 GiP 13 29 52.698 +47 11 42.93   9.26 8.36 8.40   ~ 3982 4
12 NAME Sgr B2 (North) Rad 17 47 20.2 -28 22 21           ~ 577 1
13 NAME Sgr B2 Main Rad 17 47 20.5 -28 23 06           ~ 357 1
14 ICRF J225805.9-275821 Sy1 22 58 05.96288481 -27 58 21.2567425   17.34 16.77 17.20   ~ 313 1

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2021.12.06-18:09:41

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