ALMA OBSERVATIONS OF THE SUBMILLIMETER DENSE MOLECULAR GAS TRACERS IN THE LUMINOUS TYPE-1 ACTIVE NUCLEUS OF NGC 7469
Artikel i vetenskaplig tidskrift, 2015

We present Atacama Large Millimeter/submillimeter Array (ALMA) Cycle 1 observations of the central kiloparsec region of the luminous type. 1 Seyfert galaxy NGC 7469 with unprecedented high resolution (0.'' 5x0.'' 4 = 165 x 132 pc) at submillimeter wavelengths. Utilizing the wide. bandwidth of ALMA, we simultaneously obtained HCN(4-3), HCO+(4-3), CS(7-6), and partially CO(3-2) line maps, as well as the 860 mu m continuum. The region consists of the central similar to 1 '' component and the surrounding starburst ring with a radius of similar to 1.'' 5-2.'' 5. Several structures connect these components. Except for CO(3-2), these dense gas tracers are significantly concentrated toward the central similar to 1 '', suggesting their suitability to probe the nuclear regions of galaxies. Their spatial distribution resembles well those of centimeter and mid-infrared continuum emissions, but it is anticorrelated with the optical one, indicating the existence of dust-obscured star formation. The integrated intensity ratios of HCN(4-3)/HCO+(4-3) and HCN(4-3)/CS(7-6) are higher at the active galactic nucleus (AGN) position than at the starburst ring, which is consistent with our previous findings (submillimeter-HCN enhancement). However, the HCN(4-3)/HCO+(4-3) ratio at the AGN position of NGC 7469 (1.11 +/- 0.06) is almost half of the corresponding value of the low-luminosity type. 1 Seyfert galaxy NGC 1097 (2.0 +/- 0.2), despite the more than two orders of magnitude higher X-ray luminosity of NGC 7469. But the ratio is comparable to that of the close vicinity of the AGN of NGC 1068 (similar to 1.5). Based on these results, we speculate that some heating mechanisms other than X-ray (e.g., mechanical heating due to an AGN jet) can contribute significantly for shaping the chemical composition in NGC 1097.

nuclei

galaxies: individual (NGC 7469)

star-formation

nearby

galactic

broad-line region

galaxies: active

v444

seyfert-galaxies

ISM: molecules

photon-dominated regions

cloverleaf quasar

supermassive black-hole

galaxies: ISM

nzel r

p129

Astronomy & Astrophysics

astrophysical journal

agn-driven outflow

x-ray

infrared galaxies

1995

Författare

T. Izumi

University of Tokyo

K. Kohno

University of Tokyo

Research Center for the Early Universe

Susanne Aalto

Chalmers, Rymd- och geovetenskap, Radioastronomi och astrofysik

A. Doi

JAXA Institute of Space and Astronautical Science

D. Espada

Atacama Large Millimeter-submillimeter Array

The Graduate University for Advanced Studies (SOKENDAI)

National Institutes of Natural Sciences - National Astronomical Observatory of Japan

K. Fathi

Stockholm Observatory

N. Harada

Academia Sinica

B. Hatsukade

National Institutes of Natural Sciences - National Astronomical Observatory of Japan

T. Hattori

National Institutes of Natural Sciences - National Astronomical Observatory of Japan

P. Y. Hsieh

Academia Sinica

National Central University Taiwan

S. Ikarashi

European Southern Observatory (ESO)

University of Tokyo

M. Imanishi

National Institutes of Natural Sciences - National Astronomical Observatory of Japan

The Graduate University for Advanced Studies (SOKENDAI)

D. Iono

The Graduate University for Advanced Studies (SOKENDAI)

National Institutes of Natural Sciences - National Astronomical Observatory of Japan

S. Ishizuki

National Institutes of Natural Sciences - National Astronomical Observatory of Japan

M. Krips

Institut de RadioAstronomie Millimetrique (IRAM)

S. Martin

Institut de RadioAstronomie Millimetrique (IRAM)

S. Matsushita

Academia Sinica

D. S. Meier

New Mexico Institute of Mining and Technology

H. Nagai

National Institutes of Natural Sciences - National Astronomical Observatory of Japan

N. Nakai

University of Tsukuba

T. Nakajima

Nagoya University

K. Nakanishi

National Institutes of Natural Sciences - National Astronomical Observatory of Japan

The Graduate University for Advanced Studies (SOKENDAI)

Atacama Large Millimeter-submillimeter Array

H. Nomura

Tokyo Institute of Technology

M. W. Regan

STScI

E. Schinnerer

Max Planck-institutet

K. Sheth

National Radio Astronomy Observatory

S. Takano

Nihon University

Y. Tamura

University of Tokyo

Y. Terashima

Ehime University

T. Tosaki

Joetsu University of Education

J. L. Turner

University of California

H. Umehata

University of Tokyo

Tommy Wiklind

Atacama Large Millimeter-submillimeter Array

Astrophysical Journal

0004-637X (ISSN) 1538-4357 (eISSN)

Vol. 811 Article Number: 39- 39

Ämneskategorier

Astronomi, astrofysik och kosmologi

DOI

10.1088/0004-637x/811/1/39