2018A&A...609A.101S


Query : 2018A&A...609A.101S

2018A&A...609A.101S - Astronomy and Astrophysics, volume 609A, 101-101 (2018/1-1)

STATCONT: A statistical continuum level determination method for line-rich sources.

SANCHEZ-MONGE A., SCHILKE P., GINSBURG A., CESARONI R. and SCHMIEDEKE A.

Abstract (from CDS):

STATCONT is a python-based tool designed to determine the continuum emission level in spectral data, in particular for sources with a line-rich spectrum. The tool inspects the intensity distribution of a given spectrum and automatically determines the continuum level by using different statistical approaches. The different methods included in STATCONT are tested against synthetic data. We conclude that the sigma-clipping algorithm provides the most accurate continuum level determination, together with information on the uncertainty in its determination. This uncertainty can be used to correct the final continuum emission level, resulting in the here called 'corrected sigma-clipping method' or c-SCM. The c-SCM has been tested against more than 750 different synthetic spectra reproducing typical conditions found towards astronomical sources. The continuum level is determined with a discrepancy of less than 1% in 50% of the cases, and less than 5% in 90% of the cases, provided at least 10% of the channels are line free. The main products of STATCONT are the continuum emission level, together with a conservative value of its uncertainty, and datacubes containing only spectral line emission, i.e., continuum-subtracted datacubes. STATCONT also includes the option to estimate the spectral index, when different files covering different frequency ranges are provided.

Abstract Copyright: © ESO, 2018

Journal keyword(s): methods: data analysis - techniques: image processing - techniques: spectroscopic - radio continuum: general - methods: statistical - radio lines: general

Simbad objects: 11

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Number of rows : 11
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NGC 1333 OpC 03 29 11 +31 18.6           ~ 1284 1
2 NAME Orion-KL SFR 05 35 14.16 -05 22 21.5           ~ 2104 1
3 IRC +10216 C* 09 47 57.40632 +13 16 43.5648     10.96     C9,5e 2208 0
4 IRAS 16293-2422 cor 16 32 22.56 -24 28 31.8           ~ 1117 1
5 NAME Galactic Center gam 17 45 39.60213 -29 00 22.0000           ~ 12453 0
6 NAME Sgr B2 (North) Rad 17 47 20.2 -28 22 21           ~ 573 1
7 NAME Sgr B2 MoC 17 47 20.4 -28 23 07           ~ 2038 1
8 NAME Sgr B2 Main Rad 17 47 20.5 -28 23 06           ~ 355 1
9 W 31 SFR 18 10 28.6 -19 55 51           ~ 246 0
10 GAL 029.96-00.02 Y*O 18 46 03.7 -02 39 21           ~ 341 1
11 IRAS 18449-0115 cor 18 47 34.4947 -01 12 40.269           ~ 329 0

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2021.10.24-09:25:08

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