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.

agn-driven outflow

1995

galaxies: active

galactic

x-ray

star-formation

supermassive black-hole

nearby

photon-dominated regions

galaxies: ISM

seyfert-galaxies

cloverleaf quasar

infrared galaxies

Astronomy & Astrophysics

broad-line region

astrophysical journal

nuclei

galaxies: individual (NGC 7469)

p129

v444

nzel r

ISM: molecules

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

The Graduate University for Advanced Studies (SOKENDAI)

National Astronomical Observatory of Japan

Atacama Large Millimeter-submillimeter Array (ALMA)

K. Fathi

Stockholm Observatory

N. Harada

Academia Sinica

B. Hatsukade

National Astronomical Observatory of Japan

T. Hattori

National Astronomical Observatory of Japan

P. Y. Hsieh

Academia Sinica

National Central University Taiwan

S. Ikarashi

University of Tokyo

European Southern Observatory (ESO)

M. Imanishi

National Astronomical Observatory of Japan

The Graduate University for Advanced Studies (SOKENDAI)

D. Iono

The Graduate University for Advanced Studies (SOKENDAI)

National Astronomical Observatory of Japan

S. Ishizuki

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 Astronomical Observatory of Japan

N. Nakai

University of Tsukuba

T. Nakajima

Nagoya University

K. Nakanishi

National Astronomical Observatory of Japan

Atacama Large Millimeter-submillimeter Array (ALMA)

The Graduate University for Advanced Studies (SOKENDAI)

H. Nomura

Tokyo Institute of Technology

M. W. Regan

Space Telescope Science Institute (STScI)

E. Schinnerer

Max-Planck-Gesellschaft

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 (ALMA)

Astrophysical Journal

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

Vol. 811 1 Article Number: 39- 39

Ämneskategorier

Astronomi, astrofysik och kosmologi

DOI

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

Mer information

Senast uppdaterat

2019-09-10