Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-07-06
Astronomy and Astrophysics
Astrophysics
28 pages, 15 figures, submitted to A&A
Scientific paper
10.1051/0004-6361:20065980
The highly obscured radio-bright galaxy PKS1343-601 (l=309.7, b=+1.8) has been suspected to mark the centre of a hitherto unknown cluster in the Great Attractor region. As such it presents an ideal region for a search of galaxies in the near-infrared (NIR) and an in-depth study of their colours as a function of extinction. A visual search of a ~30 square-degree area centered on this radio galaxy on images of the NIR DENIS survey (IJK) revealed 83 galaxies (including two AGNs) and 39 possible candidates. Of these, 49 are also listed in the 2MASS Extended Source Catalog 2MASX. Taking the IRAS/DIRBE extinction values (Schlegel et al. 1998) at face value, the absorption in the optical (A_B) ranges from ~2m to over 100m across the Galactic Plane. Comparing the detections with other systematic surveys, we conclude that this search is highly complete up to the detection limits of the DENIS survey and certainly surpasses any automatic galaxy finding algorithm applied to crowded areas. The NIR galaxy colours from the 7" aperture were used as a probe to measure total Galactic extinction. A comparison with the IRAS/DIRBE Galactic reddening maps suggests that the IRAS/DIRBE values result in a slight overestimate of the true extinction at such low Galactic latitudes; the inferred extinction from the galaxy colours corresponds to about 87% of the IRAS/DIRBE extinctions. Although this determination still shows some scatter, it proves the usefulness of NIR surveys for calibrating the IRAS/DIRBE maps in the extinction range of 2m < A_B < 12m.
Kraan-Korteweg Renee C.
Mamon Gary A.
Schroeder Anja C.
Woudt Patrick A.
No associations
LandOfFree
The highly obscured region around PKS1343-601 - I. Galactic interstellar extinctions using DENIS galaxy colours does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The highly obscured region around PKS1343-601 - I. Galactic interstellar extinctions using DENIS galaxy colours, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The highly obscured region around PKS1343-601 - I. Galactic interstellar extinctions using DENIS galaxy colours will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-45816