scholarly journals A molecular line survey toward the nearby galaxies NGC 1068, NGC 253, and IC 342 at 3 mm with the Nobeyama 45 m radio telescope: Impact of an AGN on 1 kpc scale molecular abundances

2018 ◽  
Vol 70 (1) ◽  
Author(s):  
Taku Nakajima ◽  
Shuro Takano ◽  
Kotaro Kohno ◽  
Nanase Harada ◽  
Eric Herbst
Keyword(s):  
Radio Telescope ◽  
Molecular Line ◽  
Nearby Galaxies ◽  
Ngc 1068 ◽  
Line Survey ◽  
Molecular Abundances

scholarly journals A molecular line survey toward the nearby galaxies NGC 1068, NGC 253, and IC 342 at 3 mm with the Nobeyama 45 m radio telescope: The data

2019 ◽  
Vol 71 (Supplement_1) ◽  
Author(s):  
Shuro Takano ◽  
Taku Nakajima ◽  
Kotaro Kohno
Keyword(s):  
Radio Telescope ◽  
High Spectral Resolution ◽  
X Rays ◽  
Narrow Beam ◽  
Molecular Line ◽  
Line Intensities ◽  
Nearby Galaxies ◽  
Ngc 1068 ◽  
Line Survey ◽  
Molecular Abundances

AbstractWe present observational data of a molecular line survey toward the nearby galaxies NGC 1068, NGC 253, and IC 342 at wavelengths of 3 mm (∼85–116 GHz) obtained with the Nobeyama 45 m radio telescope. Regarding IC 342, a line survey with high spectral resolution in the 3 mm region was reported for the first time. NGC 1068 is a nearby gas-rich galaxy with X-rays from an active galactic nucleus (AGN), and NGC 253 and IC 342 are nearby gas-rich galaxies with prototypical starbursts. These galaxies are useful for studying the impacts of X-rays and ultraviolet radiation on molecular abundances. The survey was carried out with a resulting rms noise level of a few mK ($T\rm {_A^*}$). As a result we could obtain almost complete data of these galaxies in the 3 mm region: we detected 19–23 molecular species, depending on the galaxies, including several new detections (e.g., cyclic-C3H2 in IC 342). We found that the intensities of HCN, CN, and HC3N relative to 13CO are significantly strong in NGC 1068 compared with those in NGC 253 and IC 342. On the other hand, CH3CCH was not detected in NGC 1068. We obtained these results with the narrow beam (${15{^{\prime\prime}_{.}}2}$–${19{^{\prime\prime}_{.}}1}$) of the 45 m telescope, among single-dish telescopes, and in particular selectively observed molecular gas close to the circumnuclear disk (CND) in NGC 1068. The present line intensities in NGC 1068 were compared with those obtained with the IRAM 30 m radio telescope already reported. As a result, the intensity ratio of each line was found to have information on the spatial distribution. Our observations revealed the line intensities and stringent constraints on the upper limit for the three galaxies with such a narrow beam; consequently, the present data will be a basis for further observations with high spatial resolution.

scholarly journals An ALMA and ATCA Molecular Line Survey Toward Centaurus A

2012 ◽  
Vol 8 (S292) ◽  
pp. 251-251
Author(s):  
Jürgen Ott ◽  
Mark McCoy ◽  
David Meier
Keyword(s):  
Radio Galaxy ◽  
Molecular Absorption ◽  
Physical Processes ◽  
Molecular Line ◽  
Physical Conditions ◽  
Line Survey ◽  
Molecular Abundances ◽  
Excitation Conditions ◽  
Compact Array ◽  
Centaurus A

AbstractWe present Atacama Large Millimeter/submillimeter Array (ALMA) and Australia Telescope Compact Array (ATCA) data of molecular absorption lines toward the bright central core of the prominent, nearby (d ∼ 3.8 Mpc) radio galaxy Centaurus A, at 13, 7, 3, and 1mm wavelengths. The line of sight crosses the prominent dust lane and continues through the disk and eventually through gas that may be very close to the central supermassive black hole. The goal of our survey is to determine the physical conditions of the gas via analyses of molecular line tracers including molecular abundances and excitation conditions that are sensitive to changes in temperature, density, ionization, and shocks. This study allows us to derive the physical processes that are shaping each molecular environment.

scholarly journals Molecular Line Observations Towards W58 and GL490

1992 ◽  
Vol 150 ◽  
pp. 225-226
Author(s):  
D.G. Roh ◽  
H.R. Kim ◽  
Y.C. Minh ◽  
B.R. Auh ◽  
B.C. Koo
Keyword(s):  
Radio Telescope ◽  
Spectral Resolution ◽  
High Spectral Resolution ◽  
Interstellar Molecules ◽  
Molecular Line ◽  
Star Forming ◽  
Star Forming Regions ◽  
Molecular Abundances

We observed 3 mm transitions of several interstellar molecules toward star-forming regions in W58 and GL490 using the 14 m Daeduk Radio Telescope (Korea). We derive molecular abundances for the“broad” components observed with a high spectral resolution, which could represent the abundances of outflowing materials.

scholarly journals Aλ = 3 mm molecular line survey of NGC 1068

2012 ◽  
Vol 549 ◽  
pp. A39 ◽  
Author(s):  
R. Aladro ◽  
S. Viti ◽  
E. Bayet ◽  
D. Riquelme ◽  
S. Martín ◽  
...  
Keyword(s):  
Molecular Line ◽  
Ngc 1068 ◽  
Line Survey

scholarly journals Molecular line emission in NGC 1068 imaged with ALMA

2014 ◽  
Vol 570 ◽  
pp. A28 ◽  
Author(s):  
S. Viti ◽  
S. García-Burillo ◽  
A. Fuente ◽  
L. K. Hunt ◽  
A. Usero ◽  
...  
Keyword(s):  
Line Emission ◽  
Molecular Line ◽  
Ngc 1068

Molecular Line Survey

2014 ◽  
pp. 1-6
Author(s):  
Brett A. McGuire ◽  
Anthony J. Remijan
Keyword(s):  
Molecular Line ◽  
Line Survey

scholarly journals Molecular line survey of the high-mass star-forming region NGC 6334I withHerschel/HIFI and the Submillimeter Array

2012 ◽  
Vol 546 ◽  
pp. A87 ◽  
Author(s):  
A. Zernickel ◽  
P. Schilke ◽  
A. Schmiedeke ◽  
D. C. Lis ◽  
C. L. Brogan ◽  
...  
Keyword(s):  
High Mass ◽  
Mass Star ◽  
Molecular Line ◽  
Star Forming ◽  
Line Survey

Molecular Line Observations at Parkes with a 3 GHz Maser

1979 ◽  
Vol 3 (5) ◽  
pp. 321-323 ◽  
Author(s):  
B. Höglund ◽  
J. B. Whiteoak ◽  
F. F. Gardner
Keyword(s):  
Spectral Line ◽  
Radio Telescope ◽  
Ground State ◽  
State Transitions ◽  
Space Observatory ◽  
Molecular Line ◽  
System Sensitivity ◽  
Onsala Space Observatory

A 3 GHz maser from the Onsala Space Observatory, Sweden, is currently at Parkes on a long-term loan basis. So far, it has been used on the 64-m radio telescope for a two-week period of spectral-line observations in February 1979, providing a system sensitivity far superior to that previously available at the same frequency. The observed lines were the ground-state transitions of CH at 3264, 3335 and 3349 MHz, the 211 – 212 transition of H2CS at 3139 MHz, and the 211-212 transition of CH3CHO at 3195 MHz.

scholarly journals A High Resolution HI Survey of M31

1983 ◽  
Vol 100 ◽  
pp. 23-26
Author(s):  
E. Brinks
Keyword(s):  
High Resolution ◽  
Spatial Resolution ◽  
Radio Telescope ◽  
Milky Way ◽  
Milky Way Galaxy ◽  
The Galaxy ◽  
First Results ◽  
Line Survey

The first results of a new high resolution 21-cm HI line survey of M31 made with the Westerbork Synthesis Radio Telescope are presented. Five areas were mapped, covering the galaxy except for the extreme northern and southern parts, at a resolution of δα × δδ × δV = 24″ × 36″ × 3.2 km s−1. The spatial resolution corresponds to 30 × 120 pc at the distance of M31. This is of the same order as the resolution at the distance of the center or our own galaxy given by a 25-m dish. Consequently the M31 survey is comparable to surveys of the Milky Way galaxy in wealth of detail as well as in amount of data (∼ 1 Gigabyte).

scholarly journals The UM/CTIO Magellanic Cloud Emission-line Survey

1999 ◽  
Vol 190 ◽  
pp. 28-31 ◽  
Author(s):  
R. Chris Smith ◽  
Keyword(s):  
Interstellar Medium ◽  
Emission Line ◽  
Supernova Remnants ◽  
Magellanic Cloud ◽  
Magellanic Clouds ◽  
H Ii Regions ◽  
Deep Imaging ◽  
Small Scales ◽  
Nearby Galaxies ◽  
Line Survey

The Magellanic Clouds are unique in providing sites to study the interstellar medium (ISM) and its components at all scales. To promote the pursuit of such studies, we have begun the Magellanic Cloud Emission-line Survey (MCELS), a deep imaging survey of both of these nearby galaxies in the emission of Hα, [S II], and [O III]. The emission-line images will be used in detailed optical and multiwavelength studies of H II regions, supernova remnants, planetary nebulae, superbubbles, and supergiant shells. Together with parallel surveys at other wavelengths, this survey will provide the foundation upon which to build a deeper understanding of the ISM in the Clouds and other galaxies, from small scales (~1 pc) all the way up to global scales. We present a sample of recent and current work using the MCELS dataset.

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