2015A&A...574A..85A


Query : 2015A&A...574A..85A

2015A&A...574A..85A - Astronomy and Astrophysics, volume 574A, 85-85 (2015/2-1)

High resolution observations of HCN and HCO+ J = 3-2 in the disk and outflow of Mrk 231. Detection of vibrationally excited HCN in the warped nucleus.

AALTO S., GARCIA-BURILLO S., MULLER S., WINTERS J.M., GONZALEZ-ALFONSO E., VAN DER WERF P., HENKEL C., COSTAGLIOLA F. and NERI R.

Abstract (from CDS):

Our goal is to study molecular gas properties in nuclei and large scale outflows/winds from active galactic nuclei (AGNs) and starburst galaxies. We obtained high resolution (0.25" to 0.90") observations of HCN and HCO+ J=3-2 of the ultraluminous QSO galaxy Mrk 231 with the IRAM Plateau de Bure Interferometer (PdBI). We find luminous HCN and HCO+ J=3-2 emission in the main disk and we detect compact (r≲0.1" (90pc)) vibrationally excited HCN J=3-2 ν2=1f emission centred on the nucleus. The velocity field of the vibrationally excited HCN is strongly inclined (position angle PA = 155°) compared to the east-west rotation of the main disk. The nuclear (r≲ 0.1") molecular mass is estimated to 8x108M with an average N(H2) of 1.2x1024cm–2. Prominent, spatially extended (>350pc) line wings are found for HCN J=3-2 with velocities up to±750km/s. Line ratios indicate that the emission is emerging in dense gas n=104 - 5x105/cm3 of elevated HCN abundance X(HCN)=10–8-10–6. The highest X(HCN) also allows for the emission to originate in gas of more moderate density. We tentatively detect nuclear emission from the reactive ion HOC+ with HCO+/HOC+=10-20. The HCN ν2=1f line emission is consistent with the notion of a hot, dusty, warped inner disk of Mrk 231 where the ν2=1f line is excited by bright mid-IR 14 µm continuum. We estimate the vibrational temperature Tvib to 200-400 K. Based on relative source sizes we propose that 50% of the main HCN emission may have its excitation affected by the radiation field through IR pumping of the vibrational ground state. The HCN emission in the line wings, however, is more extended and thus likely not strongly affected by IR pumping. Our results reveal that dense clouds survive (and/or are formed) in the AGN outflow on scales of at least several hundred pc before evaporating or collapsing. The elevated HCN abundance in the outflow is consistent with warm chemistry possibly related to shocks and/or X-ray irradiated gas. An upper limit to the mass and momentum flux is 4x108M and 12LAGN/c, respectively, and we discuss possible driving mechanisms for the dense outflow.

Abstract Copyright:

Journal keyword(s): galaxies: evolution - galaxies: individual: Mrk 231 - galaxies: active - ISM: molecules - ISM: jets and outflows - quasars: general

Simbad objects: 8

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Number of rows : 8
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 M 77 Sy2 02 42 40.7091669408 -00 00 47.859690204 9.70 9.61 8.87 10.1 9.9 ~ 4597 2
2 LB 2136 Sy1 11 53 24.46663994 +49 31 08.8301372   17.94 17.66     ~ 498 1
3 NGC 4355 Sy2 12 26 54.6206739120 -00 52 39.421212996   14.21 13.37     ~ 489 2
4 3C 273 BLL 12 29 06.6998257176 +02 03 08.597629980   13.05 14.830 14.11   ~ 5797 1
5 Mrk 231 Sy1 12 56 14.2341182928 +56 52 25.238373852   14.68 13.84     ~ 1986 3
6 ICRF J141946.5+542314 Sy2 14 19 46.5974051952 +54 23 14.787857796   16.17 15.65 14.16   ~ 595 1
7 ESO 286-19 LIN 20 58 26.8183783008 -42 38 59.411838156   14.79 14.79 14.20   ~ 291 0
8 3C 461 BL? 23 23 24.000 +58 48 54.00     14.30     ~ 2789 1

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