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
Stockholms observatorium
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
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 Millimétrique (IRAM)
S. Martin
Institut de Radioastronomie Millimétrique (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- 39Ämneskategorier
Astronomi, astrofysik och kosmologi
DOI
10.1088/0004-637x/811/1/39