Query : 2000A&A...353...72B

2000A&A...353...72B - Astronomy and Astrophysics, volume 353, 72-76 (2000/1-1)

A unified image of dust grains for the warped spiral galaxy in the merger Centaurus A.


Abstract (from CDS):

A unified view of dust grains of all sizes and temperatures in Centaurus A has been generated by combining ISOCAM mid-infrared images with optical data. In our unified V-15µm ratio image, a symmetrical bar-like structure and spiral arms of size 1.5 kpc surround the nucleus. We have overlaid the (H-K) model colour map of Quillen (1993ApJ...412..550Q) and find a striking correspondence with the ridges seen in emission 15µm and the dark lanes which they find in the near-infrared. The inference is that the morphology of large cold dust grains, responsible for the extinction at V, H and K, closely follows that of the hot dust over the full projected 3kpc diameter of the mini-spiral galaxy. From the spatial distribution of our V-15µm map, we derive a dust mass of approximately 2106M, similar to the dust mass of the Triangulum galaxy NGC 598 (M 33). A further intercomparison of optical and ISO images reveals that the morphology of the warp of the central spiral may be optically traced: the contours of an entire one half of the spiral lie on the same warped ridge as that found in optical photographs.

Abstract Copyright:

Journal keyword(s): galaxies: individual: NGC 5128 - ISM: dust, extinction - infrared: ISM: continuum - infrared: ISM: lines and bands

Simbad objects: 3

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Number of rows : 3
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
1 M 33 GiG 01 33 50.8965749232 +30 39 36.630403128 6.17 6.27 5.72     ~ 5488 1
2 NAME Centaurus A Sy2 13 25 27.6039817176 -43 01 09.493008456   8.18 6.84 6.66   ~ 4230 3
3 M 51 GiP 13 29 52.698 +47 11 42.93   9.26 8.36 8.40   ~ 4061 4

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