2018A&A...609A..75F


Query : 2018A&A...609A..75F

2018A&A...609A..75F - Astronomy and Astrophysics, volume 609A, 75-75 (2018/1-1)

Hidden molecular outflow in the LIRG Zw 049.057.

FALSTAD N., AALTO S., MANGUM J.G., COSTAGLIOLA F., GALLAGHER J.S., GONZALEZ-ALFONSO E., SAKAMOTO K., KONIG S., MULLER S., EVANS A.S. and PRIVON G.C.

Abstract (from CDS):

Context. Feedback in the form of mass outflows driven by star formation or active galactic nuclei is a key component of galaxy evolution. The luminous infrared galaxy Zw 049.057 harbours a compact obscured nucleus with a possible far-infrared signature of outflowing molecular gas. Due to the high optical depths at far-infrared wavelengths, however, the interpretation of the outflow signature is uncertain. At millimeter and radio wavelengths, the radiation is better able to penetrate the large columns of gas and dust responsible for the obscuration.
Aims. We aim to investigate the molecular gas distribution and kinematics in the nucleus of Zw 049.057 in order to confirm and locate the molecular outflow, with the ultimate goal to understand how the nuclear activity affects the host galaxy.
Methods. We used high angular resolution observations from the Submillimeter Array (SMA), the Atacama Large Millimeter/submillimeter Array (ALMA), and the Karl G. Jansky Very Large Array (VLA) to image the CO J=2-1 and J=6-5 emission, the 690 GHz continuum, the radio centimeter continuum, and absorptions by rotationally excited OH.
Results. The CO line profiles exhibit wings extending ∼300km/s beyond the systemic velocity. At centimeter wavelengths, we find a compact (∼40pc) continuum component in the nucleus, with weaker emission extending several 100pc approximately along the major and minor axes of the galaxy. In the OH absorption lines toward the compact continuum, wings extending to a similar velocity as for the CO are only seen on the blue side of the profile. The weak centimeter continuum emission along the minor axis is aligned with a highly collimated, jet-like dust feature previously seen in near-infrared images of the galaxy. Comparison of the apparent optical depths in the OH lines indicate that the excitation conditions in Zw 049.057 differ from those within other OH megamaser galaxies.
Conclusions. We interpret the wings in the spectral lines as signatures of a nuclear molecular outflow. A relation between this outflow and the minor axis radio feature is possible, although further studies are required to investigate this possible association and understand the connection between the outflow and the nuclear activity. Finally, we suggest that the differing OH excitation conditions are further evidence that Zw 049.057 is in a transition phase between megamaser and kilomaser activity.

Abstract Copyright: © ESO, 2018

Journal keyword(s): galaxies: individual: Zw 049.057 - galaxies: kinematics and dynamics - galaxies: ISM - ISM: molecules

Simbad objects: 18

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Number of rows : 18
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 ZW III 35 Sy2 01 44 30.516 +17 06 09.18   15.24 14.81     ~ 236 0
2 NGC 1266 AGN 03 16 00.7739640240 -02 25 37.827013584   14   12.46   ~ 279 1
3 NGC 1377 GiG 03 36 39.077 -20 54 08.14   13.38   12.12   ~ 210 0
4 NGC 3256 IG 10 27 51.284 -43 54 13.55   11.83 11.33 10.62 11.9 ~ 804 2
5 NGC 3690 IG 11 28 31.326 +58 33 41.80   13.19 12.86     ~ 935 4
6 ESO 320-30 H2G 11 53 11.722 -39 07 48.72   13.30   11.86   ~ 166 1
7 3C 273 BLL 12 29 06.6998257176 +02 03 08.597629980   13.05 14.830 14.11   ~ 5571 1
8 3C 279 Bla 12 56 11.1663795384 -05 47 21.528432492   18.01 17.75 15.87   ~ 2870 2
9 Mrk 231 Sy1 12 56 14.2341182928 +56 52 25.238373852   14.68 13.84     ~ 1900 3
10 IC 860 LIN 13 15 03.51 +24 37 07.8   14.8       ~ 199 0
11 M 51 GiP 13 29 52.698 +47 11 42.93   9.26 8.36 8.40   ~ 4080 4
12 3C 286 Sy1 13 31 08.2883506368 +30 30 32.960091564   17.51 17.25     ~ 4078 2
13 Mrk 273 Sy2 13 44 42.1883001096 +55 53 13.596220932   15.68 14.91     ~ 864 3
14 QSO B1502+1041 Bla 15 04 24.9800240304 +10 29 39.197268420   18.97 18.56 18.94   ~ 510 1
15 Z 49-57 GiC 15 13 13.1083645344 +07 13 32.099256084   15.5       ~ 222 1
16 IC 4553 SyG 15 34 57.22396 +23 30 11.6084   14.76 13.88     ~ 2830 4
17 QSO B1546+0246 QSO 15 49 29.4369280464 +02 37 01.161302952   17.57 17.42 15.53   ~ 331 1
18 4C 05.64 QSO 15 50 35.2692689760 +05 27 10.455019380   19.10 18.73 19.02   ~ 303 1

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2022.07.02-00:33:12

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