2012A&A...543A..21H


Query : 2012A&A...543A..21H

2012A&A...543A..21H - Astronomy and Astrophysics, volume 543A, 21-21 (2012/7-1)

On the nature of dust clouds in the region towards M 81 and NGC 3077.

HEITHAUSEN A.

Abstract (from CDS):

There is some controversy on the nature of dust clouds found in direction of the interacting galaxy triplett M81, M82, and NGC3077. Are they associated with the tidal arms seen in HI around those galaxies or are they simply Galactic foreground clouds? Data from the SPIRE instrument onboard Herschel and MIPS onboard of Spitzer are used to derive physical parameters for the dust clouds. These observions are compared to CO clouds previously mapped with the IRAM and the FCRAO radio telescopes. SPIRE and MIPS maps show several dust clouds north of M81 and south of NGC3077. Modelling of the dust emission provides total hydrogen column densities between 1.5 and 5.0x1020cm–2. Dust temperatures are between 13 to 17K. No significant difference in the dust emission can be found between individual clouds. It is shown that CO line emission provides the best clues on the origin of those clouds. Most of the clouds seen towards M81 are associated with small-area molecular structures (SAMS), i.e. tiny CO clouds of Galactic origin. The clouds seen towards NGC3077 are partly associated with the tidal arms and are partly in the Galactic foreground associated with SAMS.

Abstract Copyright:

Journal keyword(s): ISM: clouds - ISM: individual objects: SAMS 1 - ISM: individual objects: SAMS 2 - galaxies: individual: M 81 - molecules - ISM: galaxies: individual: NGC 3077

Nomenclature: Table 1 : [H2012] SAMSN (Nos 1-9), [H2012] NGC3077-TAN (Nos TA1-TA3), [H2012] M81-OA N=1.

Simbad objects: 19

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Number of rows : 19
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 [H2012] SAMS8 IR 09 52 28.00 +69 09 06.8           ~ 1 0
2 [H2012] SAMS7 IR 09 52 53.10 +69 08 09.6           ~ 1 0
3 [H2012] SAMS9 IR 09 54 31.40 +69 17 19.5           ~ 1 0
4 [H2012] M81-OA IR 09 54 35.50 +69 14 22.0           ~ 1 0
5 M 81 Sy2 09 55 33.1726556496 +69 03 55.062505368   7.89 6.94     ~ 4265 3
6 M 82 IG 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 5681 6
7 [H2012] SAMS2 IR 09 57 01.00 +69 19 05.4           ~ 1 0
8 [H2012] SAMS5 IR 09 57 11.90 +69 24 15.3           ~ 1 0
9 [H2012] SAMS6 IR 09 57 18.50 +69 13 22.4           ~ 1 0
10 [H2012] SAMS3 IR 09 57 36.80 +69 19 48.7           ~ 1 0
11 [H2012] SAMS4 IR 09 58 36.50 +69 24 16.8           ~ 1 0
12 NGC 3077 GiP 10 03 19.0965510921 +68 44 01.556166166 11.23 10.85 10.14 9.74   ~ 742 0
13 [H2012] SAMS1 IR 10 03 28.40 +68 41 29.2           ~ 1 0
14 [H2012] NGC3077-TA3 IR 10 03 48.00 +68 42 01.4           ~ 1 0
15 [H2012] NGC3077-TA2 IR 10 03 55.40 +68 42 39.4           ~ 1 0
16 [H2012] NGC3077-TA1 IR 10 04 00.60 +68 41 09.9           ~ 1 0
17 NGC 3269 GiG 10 29 57.0426202656 -35 13 27.888395700   13.24 13.51 11.73   ~ 40 0
18 NAME Polaris Flare MoC 11 00 14.8 +86 10 52           ~ 184 1
19 NGC 4435 GiG 12 27 40.503 +13 04 44.48 12.23 11.74 10.80     ~ 431 2

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2023.02.04-09:09:50

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