2008MNRAS.387..601W

Query : 2008MNRAS.387..601W

2008MNRAS.387..601W - Mon. Not. R. Astron. Soc., 387, 601-615 (2008/June-3)

Timeline analysis and wavelet multiscale analysis of the AKARI All-Sky Survey at 90µm.

WANG L., ROWAN-ROBINSON M., YAMAMURA I., SHIBAI H., SAVAGE R., OLIVER S., THOMSON M., RAHMAN N., CLEMENTS D., FIGUEREDO E., GOTO T., HASEGAWA S., JEONG W.-S., MATSUURA S., MULLER T.G., NAKAGAWA T., PEARSON C.P., SERJEANT S., SHIRAHATA M. and WHITE G.J.

Abstract (from CDS):

We present a careful analysis of the point-source detection limit of the AKARI All-Sky Survey in the WIDE-S 90-µm band near the North Ecliptic Pole (NEP). Timeline analysis is used to detect IRAS (Infrared Astronomy Satellite) sources and then a conversion factor is derived to transform the peak timeline signal to the interpolated 90-µm flux of a source. Combined with a robust noise measurement, the point-source flux detection limit at signal-to-noise ratio (S/N) > 5 for a single detector row is 1.1 ±0.1Jy which corresponds to a point-source detection limit of the survey of ∼0.4Jy.

Wavelet transform offers a multiscale representation of the Time Series Data (tsd). We calculate the continuous wavelet transform of the tsd and then search for significant wavelet coefficients considered as potential source detections. To discriminate real sources from spurious or moving objects, only sources with confirmation are selected. In our multiscale analysis, IRAS sources selected above 4σ can be identified as the only real sources at the Point Source Scales. We also investigate the correlation between the non-IRAS sources detected in timeline analysis and cirrus emission using wavelet transform and contour plots of wavelet power spectrum. It is shown that the non-IRAS sources are most likely to be caused by excessive noise over a large range of spatial scales rather than real extended structures such as cirrus clouds.


Abstract Copyright: © 2008 The Authors. Journal compilation © 2008 RAS

Journal keyword(s): methods: data analysis - surveys - infrared: galaxies - infrared: ISM

CDS comments: In table 4 : The cirrus Candidates are not in Simbad.

Simbad objects: 25

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Number of rows : 25
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NGC 6543 PN 17 58 33.4039587288 +66 37 58.750734000   11.09 11.28     [WC] 1197 2
2 NAME NEP reg 18 00 00.000 +66 33 38.55           ~ 430 0
3 NGC 6552 Sy2 18 00 07.2518347776 +66 36 54.360343188   14.6 13.74     ~ 184 1
4 IRAS F18112+6503 IR 18 11 23.8 +65 04 20           ~ 3 0
5 2MASX J18131584+6456192 G 18 13 15.8704720632 +64 56 19.063387356   17       ~ 5 0
6 MCG+11-22-039 G 18 18 55.2348243888 +63 42 53.051455332   16.2       ~ 10 0
7 IRAS 18197+6339 G 18 20 03.4 +63 40 32           ~ 7 0
8 MCG+10-26-035 G 18 22 47.4582140592 +62 57 13.018926096   16       ~ 11 0
9 2MASX J18253667+6317379 H2G 18 25 36.680 +63 17 37.91           ~ 6 0
10 IRAS F18254+6200 IR 18 25 56.8 +62 02 26           ~ 3 0
11 IRAS 18286+6309 FIR 18 29 02.5 +63 11 57           ~ 4 0
12 IRAS F18293+6304 IR 18 29 41.8 +63 06 52           ~ 3 0
13 MCG+10-26-042 G 18 30 40.0 +61 41 02   16       ~ 3 0
14 Z 301-33 G 18 36 00.4293135496 +59 52 41.073522118   15.7       ~ 6 0
15 NGC 6701 AGN 18 43 12.429 +60 39 12.13   12.9       ~ 142 1
16 IRAS 18436+5931 FIR 18 44 23.9 +59 34 18           ~ 2 0
17 IRAS F18436+5847 FIR 18 44 27.4 +58 50 47           ~ 4 0
18 IRAS 18440+5900 FIR 18 44 49.5 +59 04 03           ~ 4 0
19 2MASX J18505702+5545360 PaG 18 50 56.9588585376 +55 45 36.465403608   15.7       ~ 7 0
20 IRAS 18506+5801 FIR 18 51 28.7 +58 04 58           ~ 5 0
21 Z 280-6 rG 18 52 00.337 +55 43 29.98   15.2       ~ 19 1
22 IRAS F18520+5715 IR 18 52 52.6 +57 19 40           ~ 3 0
23 IRAS F18597+5631 IR 19 00 38.9 +56 36 19           ~ 3 0
24 IRAS 19009+5507 FIR 19 01 57.6 +55 11 40           ~ 2 0
25 LEDA 2553518 G 19 03 31.8794075256 +56 58 40.322557272           ~ 4 0

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