1997A&A...325..124D


Query : 1997A&A...325..124D

1997A&A...325..124D - Astronomy and Astrophysics, volume 325, 124-134 (1997/9-1)

The interstellar medium in the edge-on galaxy NGC 5907. Cold dust and molecular line emission.

DUMKE M., BRAINE J., KRAUSE M., ZYLKA R., WIELEBINSKI R. and GUELIN M.

Abstract (from CDS):

In this paper we present new observations of the interstellar medium in the non-interacting edge-on galaxy NGC 5907. We have observed the J=2-1 and J=1-0 lines of the 12CO molecule and radio continuum emission at λ1.2mm. The distribution of the molecular gas (as traced by CO) shows a maximum in the central region and a ring or spiral arm at r∼7kpc. Further analysis of the major axis distribution reveals evidence for an inner ring-like structure at r∼3.5kpc. The kinematics can be described by rigid rotation in the inner part, a turnover at ∼3kpc, and differential rotation with a velocity of 230km/s in the outer disk. The observed continuum emission is mainly due to thermal radiation of cold dust with an average temperature of Td=18K, with a small gradient from 20K to 16K from the centre to the outer disk. This cold dust component is necessary to explain our results. The dust emission closely follows the molecular gas in the central region, but is also detected at large radii where no CO can be seen. In these regions the dust absorption cross section per H atom at λ1.2mm is estimated to be σλHI∼4.5x10–27cm2, a value similar to that in the outer parts of other galaxies. From the λ1.2mm emission we estimated a molecular mass of NGC 5907 of 0.9x109M, about 50% smaller than from the CO emission. By combining the CO and continuum data we found that the CO-H2-conversion ratio increases with galactocentric radius, from ∼0.7x1020 at the centre to ∼1.6x1020cm–2/K.km/s at r=7.5kpc. A comparison of NGC 5907 and other edge-on galaxies concerning gas distribution, central kinematics and dust properties is presented.

Abstract Copyright:

Journal keyword(s): galaxies: individual: NGC 5907 - galaxies: ISM - galaxies: kinematics and dynamics - infrared: galaxies - radio continuum: galaxies - radio lines: galaxies

Simbad objects: 8

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Number of rows : 8
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 NGC 891 H2G 02 22 32.907 +42 20 53.95 11.08 10.81 9.93 7.86   ~ 1593 2
2 NGC 3079 Sy2 10 01 57.8789863992 +55 40 47.449758324 11.57 11.54 10.86     ~ 1316 3
3 M 66 GiP 11 20 15.026 +12 59 28.64 9.85 9.65 8.92     ~ 1269 4
4 NGC 4565 LIN 12 36 20.804 +25 59 14.61   13.61 12.43     ~ 913 0
5 NGC 4631 GiP 12 42 08.009 +32 32 29.44   9.78 9.19 9.10   ~ 1029 2
6 M 51 GiP 13 29 52.698 +47 11 42.93   9.26 8.36 8.40   ~ 4078 4
7 6C 141804+543700 BLL 14 19 46.5974051952 +54 23 14.787857796   16.17 15.65 14.16   ~ 561 1
8 NGC 5906 GiG 15 15 53.687 +56 19 43.86   11.4       ~ 722 1

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2022.06.28-12:15:33

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