2013ApJ...773L..37Y

Query : 2013ApJ...773L..37Y

2013ApJ...773L..37Y - Astrophys. J., 773, L37 (2013/August-3)

Difference in the spatial distribution between H2 O and CO2Ices in M 82 found with AKARI.

YAMAGISHI M., KANEDA H., ISHIHARA D., OYABU S., ONAKA T., SHIMONISHI T., SUZUKI T. and MINH Y.C.

Abstract (from CDS):

With AKARI, we obtain the spatially resolved near-infrared (NIR) (2.5-5.0 µm) spectra for the nearby starburst galaxy M 82. These spectra clearly show absorption features due to interstellar ices. Based on the spectra, we created the column density maps of H2 O and CO2ices. As a result, we find that the spatial distribution of H2 O ice is significantly different from that of CO2ice; H2 O ice is widely distributed, while CO2ice is concentrated near the galactic center. Our result reveals for the first time variations in CO2/H2 O ice abundance ratio on a galactic scale, suggesting that an ice-forming interstellar environment changes within a galaxy. We discuss the cause of the spatial variations in the ice abundance ratio, utilizing spectral information on the hydrogen recombination Brα and Brβ lines and the polycyclic aromatic hydrocarbon 3.3 µm emission appearing in the AKARI NIR spectra.

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Journal keyword(s): galaxies: individual: M 82 - galaxies: ISM - infrared: galaxies - ISM: molecules

Simbad objects: 12

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Number of rows : 12
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 17 Sy2 00 11 06.612 -12 06 28.33   14.14 13.52     ~ 369 1
2 NGC 253 SyG 00 47 33.134 -25 17 19.68   8.03   6.94 8.1 ~ 3588 2
3 Z 436-30 LIN 01 20 02.654 +14 21 41.73   14.9       ~ 176 1
4 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 4971 0
5 M 82 AGN 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 6156 6
6 MCG-04-31-023 Sy1 13 02 52.3177169808 -23 55 17.932558692   14.77 14.78 13.24 13.59 ~ 131 1
7 NGC 4945 Sy2 13 05 27.279 -49 28 04.44   9.31 14.40 7.55   ~ 1582 2
8 IC 883 SBG 13 20 35.37960 +34 08 21.8400   14.8       ~ 421 1
9 IC 1127 SyG 15 34 57.22396 +23 30 11.6084   14.76 13.88     ~ 3090 4
10 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3969 1
11 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
12 IC 5146 OpC 21 53 29.3 +47 14 46           ~ 507 2

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