2003A&A...402..499S


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.03CET11:05:40

2003A&A...402..499S - Astronomy and Astrophysics, volume 402, 499-507 (2003/5-1)

Detection of strongly processed ice in the central starburst of NGC 4945.

SPOON H.W.W., MOORWOOD A.F.M., PONTOPPIDAN K.M., CAMI J., KREGEL M., LUTZ D. and TIELENS A.G.G.M.

Abstract (from CDS):

The composition of ice grains provides an important tool for the study of the molecular environment of star forming regions. Using ISAAC at the VLT to obtain spectra around 4.65µm we have detected for the first time ``XCN'' and CO ice in an extragalactic environment: the nuclear region of the nearby dusty starburst/AGN galaxy NGC 4945. The profile of the solid CO band reveals the importance of thermal processing of the ice while the prominence of the XCN band attests to the importance of energetic processing of the ice by FUV radiation and/or energetic particles. In analogy to the processing of ices by embedded protostars in our Galaxy, we attribute the processing of the ices in the center of NGC 4945 to ongoing massive star formation. Our M-band spectrum also shows strong HIPfβ and H2 0-0 S(9) line emission and gas phase CO absorption lines. The HI, H2, PAH, gas phase CO and the ices seem to be embedded in a rotating molecular disk which is undergoing vigorous star formation. Recently, strong OCN absorption has been detected in the spectrum of the Galactic center star GC: IRS 19. The most likely environment for the OCN absorption is the strongly UV-exposed GC molecular ring. The presence of processed ice in the center of NGC 4945 and our Galactic center leads us to believe that processed ice may be a common characteristic of dense molecular material in star forming galactic nuclei.

Abstract Copyright:

Journal keyword(s): galaxies: individual: NGC 4945 - galaxies: ISM - galaxies: nuclei - galaxies: starburst - infrared: galaxies

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 IRAS F00183-7111 Sy2 00 20 34.7 -70 55 27     20.6     ~ 123 0
2 NGC 253 SyG 00 47 33.134 -25 17 19.68   8.03   6.94 8.1 ~ 3000 2
3 Kim 1-38 * 04 39 38.8673861844 +26 11 26.630421918           K1III 126 0
4 RAFGL 961 Y*O 06 34 37.741 +04 12 44.20           ~ 236 1
5 M 82 IG 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 5426 6
6 NGC 4355 Sy2 12 26 54.628 -00 52 39.51   14.21 13.37     ~ 420 2
7 NGC 4945 Sy2 13 05 27.279 -49 28 04.44   9.31 14.40 7.55   ~ 1301 2
8 * bet Lup PM* 14 58 31.92536 -43 08 02.2699 1.59 2.46 2.68 2.78 2.95 B2III 180 0
9 NAME Sgr A* X 17 45 40.03599 -29 00 28.1699           ~ 3600 3
10 GCIRS 9 LP* 17 45 40.447 -29 00 34.49           M3III 101 0
11 W 33a Y*O 18 14 39.0 -17 52 03           ~ 593 0

    Equat.    Gal    SGal    Ecl

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2021.03.03-11:05:40

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