2016A&A...590A..73A


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.14CEST12:13:22

2016A&A...590A..73A - Astronomy and Astrophysics, volume 590A, 73-73 (2016/6-1)

A precessing molecular jet signaling an obscured, growing supermassive black hole in NGC 1377?

AALTO S., COSTAGLIOLA F., MULLER S., SAKAMOTO K., GALLAGHER J.S., DASYRA K., WADA K., COMBES F., GARCIA-BURILLO S., KRISTENSEN L.E., MARTIN S., VAN DER WERF P., EVANS A.S. and KOTILAINEN J.

Abstract (from CDS):

With high resolution (0.25x0.18) ALMA CO 3-2 (345GHz) observations of the nearby (D=21Mpc, 1''=102pc), extremely radio-quiet galaxy NGC 1377, we have discovered a high-velocity, very collimated nuclear outflow which we interpret as a molecular jet with a projected length of ±150pc. The launch region is unresolved and lies inside a radius r<10pc. Along the jet axis we find strong velocity reversals where the projected velocity swings from -150km/s to +150km/s. A simple model of a molecular jet precessing around an axis close to the plane of the sky can reproduce the observations. The velocity of the outflowing gas is difficult to constrain due to the velocity reversals but we estimate it to be between 240 and 850km/s and the jet to precess with a period P=0.3-1.1Myr. The CO emission is clumpy along the jet and the total molecular mass in the high-velocity (±(60 to 150km/s)) gas lies between 2x106M (light jet) and 2x107M (massive jet). There is also CO emission extending along the minor axis of NGC 1377. It holds >40% of the flux in NGC 1377 and may be a slower, wide-angle molecular outflow which is partially entrained by the molecular jet. We discuss the driving mechanism of the molecular jet and suggest that it is either powered by a (faint) radio jet or by an accretion disk-wind similar to those found towards protostars. It seems unlikely that a massive jet could have been driven out by the current level of nuclear activity which should then have undergone rapid quenching. The light jet would only have expelled 10% of the inner gas and may facilitate nuclear activity instead of suppressing it. The nucleus of NGC 1377 harbours intense embedded activity and we detect emission from vibrationally excited HCN J=4-3ν2=1f which is consistent with hot gas and dust. We find large columns of H2 in the centre of NGC 1377 which may be a sign of a high rate of recent gas infall. The dynamical age ofthe molecular jet is short (<1Myr), which could imply that it is young and consistent with the notion that NGC 1377 is caught in a transient phase of its evolution. However, further studies are required to determine the age of the molecular jet, its mass and the role it is playing in the growth of the nucleus of NGC 1377.

Abstract Copyright: © ESO, 2016

Journal keyword(s): galaxies: evolution - galaxies: active - galaxies: individual: NGC 1377 - galaxies: jets - 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 - 2021
#notes
1 M 77 GiP 02 42 40.771 -00 00 47.84 9.70 9.61 8.87 10.1 9.9 ~ 4191 2
2 NGC 1266 AGN 03 16 00.749 -02 25 38.53   14   12.46   ~ 264 1
3 [JCC87] IRAS 4A Y*O 03 29 10.49 +31 13 30.8           ~ 626 1
4 QSO B0332-403 BLL 03 34 13.6547438706 -40 08 25.401996186 18.54 18.35 17.87 17.5   ~ 278 1
5 NGC 1377 GiG 03 36 39.077 -20 54 08.14   13.38   12.12   ~ 197 0
6 QSO B0338-214 BLL 03 40 35.60786053 -21 19 31.1720263   16.04 17.1 17.07   ~ 152 1
7 QSO B0420-0127 QSO 04 23 15.80072776 -01 20 33.0654034   17.50 17.00 16.28   ~ 1090 3
8 RAFGL 5123 Y*O 04 31 34.07736 +18 08 04.9020           K3V/M3III 818 0
9 NGC 3256 IG 10 27 51.284 -43 54 13.55   11.83 11.33 10.62 11.9 ~ 771 2
10 NGC 4355 Sy2 12 26 54.628 -00 52 39.51   14.21 13.37     ~ 424 2
11 IC 860 LIN 13 15 03.51 +24 37 07.8   14.8       ~ 184 0
12 M 51 GiP 13 29 52.698 +47 11 42.93   9.26 8.36 8.40   ~ 3919 4
13 Z 49-57 GiC 15 13 13.1 +07 13 32   15.5       ~ 213 1
14 IRAS 16293-2422 cor 16 32 22.56 -24 28 31.8           ~ 1086 1
15 NAME Great Annihilator LXB 17 43 54.83 -29 44 42.6           ~ 642 1
16 SS 433 HXB 19 11 49.5645897700 +04 58 57.824087535   16.3 13.0     A7Ib: 1961 4
17 LDN 1157 DNe 20 39 06.4 +68 02 13           ~ 504 0
18 IC 5063 Sy2 20 52 02.329 -57 04 07.60   12.92 13.60 11.30   ~ 566 1

    Equat.    Gal    SGal    Ecl

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2021.04.14-12:13:22

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