2007A&A...471..807J


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.04CEST14:00:24

2007A&A...471..807J - Astronomy and Astrophysics, volume 471, 807-812 (2007/9-1)

Extinction law classification and lens redshift estimate by means of the principal component analysis.

JEAN C. and SURDEJ J.

Abstract (from CDS):

We propose a method based on the Principal Component Analysis (PCA) to classify and estimate the redshift of an extinction law in a distant gravitational lens galaxy. Such extinction laws are very poorly known and an efficient method to characterize them is badly needed. We first compute the principal axes of an exhaustive collection of redshifted theoretical extinction laws. Then, we project on these new axes the extinction law we wish to classify. The position of its projection among those redshifted extinction laws from the collection allows us to characterize it and to estimate its redshift. Monte Carlo simulations show that the method is efficient and relatively precise for reasonably good signal-to-noise ratio data. The application of the method to a real case, the gravitational lens system SBS 0909+532, leads to very encouraging results.

Abstract Copyright:

Journal keyword(s): dust, extinction - methods: data analysis

Simbad objects: 9

goto Full paper

goto View the reference in ADS

Number of rows : 9

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 10902 1
2 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 5665 1
3 NGC 2076 GiG 05 46 47.465 -16 46 57.47   12.7   11.84 12.2 ~ 54 0
4 NGC 2207 IG 06 16 22.093 -21 22 21.80   11.48 10.65 10.21 11.9 ~ 258 3
5 QSO B0909+5312 QSO 09 13 01.031 +52 59 28.90   17.29 16.71     ~ 131 1
6 [VV2000] J115518.3+193942 QSO 11 55 18.3 +19 39 42   17.15 16.89     ~ 85 2
7 M 101 GiP 14 03 12.583 +54 20 55.50   8.46 7.86 7.76   ~ 2544 2
8 NGC 7070 GiG 21 30 25.342 -43 05 13.56   12.70 12.29 11.76 12.4 ~ 61 0
9 NGC 7625 IG 23 20 30.132 +17 13 32.16 13.31 13.23 11.98 11.25   ~ 242 0

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2007A&A...471..807J and select 'bookmark this link' or equivalent in the popup menu


2020.07.04-14:00:24

© Université de Strasbourg/CNRS

    • Contact