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ASTE CO(3--2) Observations of the Southern Barred Spiral Galaxy NGC 986: a Large Gaseous Bar Filled with Dense Molecular Medium | | K. Kohno
; T. Tosaki
; R. Miura
; K. Muraoka
; T. Sawada
; K. Nakanishi
; N. Kuno
; T. Sakai
; K. Sorai
; K. Kamegai
; K. Tanaka
; T. Okuda
; A. Endo
; B. Hatsukade
; M. Sameshima
; H. Ezawa
; S. Sakamoto
; T. Kamazaki
; J. Cortes
; Y. Tamura
; M. Fukuhara
; D. Iono
; R. Kawabe
; | | Date: |
10 May 2008 | | Abstract: | We present CO(3-2) emission observations toward the 3’x3’ (or 20x20kpc at a
distance of 23Mpc) region of the southern barred spiral galaxy NGC 986 using
the Atacama Submillimeter Telescope Experiment (ASTE). This effort is a part of
our on-going extragalactic CO(3-2) imaging project ADIoS (ASTE Dense gas
Imaging of Spiral galaxies). Our CO(3-2) image revealed the presence of a large
(the major axis is 14 kpc in total length) gaseous bar filled with dense
molecular medium along the dark lanes observed in optical images. This is the
largest ’’dense-gas rich bar’’ known to date. The dense gas bar discovered in
NGC 986 could be a huge reservoir of possible ’’fuel’’ for future starbursts in
the central region, and we suggest that the star formation in the central
region of NGC 986 could still be in a growing phase. We found a good spatial
coincidence between the overall distributions of dense molecular gas traced by
CO(3-2) and the massive star formation depicted by H$alpha$. The global
CO(3-2) luminosity $L’_{
m CO(3-2)}$ of NGC 986 was determined to be $(5.4 pm
1.1) imes 10^8$ K km s$^{-1}$ pc$^2$. The CO(3-2)/CO(1-0) integrated
intensity ratio was found to be 0.60 +/- 0.13 at a spatial resolution of 44’’
or 5 kpc, and a CO(3-2)/CO(2-1) ratio was 0.67 +/- 0.14 at a beam size of ~25’’
or ~2.8 kpc. These line ratios suggest moderate excitation conditions of CO
lines ($n_{
m H_2} sim 10^{3-4}$ cm$^{-3}$) in the central a few kpc region
of NGC 986. | | Source: | arXiv, 0805.1491 | | Services: | Forum | Review | PDF | Favorites | |
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