2008A&A...480..157Y


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.23CEST18:53:55

2008A&A...480..157Y - Astronomy and Astrophysics, volume 480, 157-166 (2008/3-2)

Far-infrared spectroscopic observations of the Galactic center region.

YASUDA A., NAKAGAWA T., SPAANS M., OKADA Y. and KANEDA H.

Abstract (from CDS):

The Galactic center region is luminous in the far-infrared (FIR), but dominant sources of this luminosity are still controversial. We investigate physical conditions of the diffuse interstellar medium in the Galactic center region by multi-line spectroscopy in the FIR. We analyze the archival data of the Galactic center region obtained with the Long-Wavelength Spectrometer on board the Infrared Space Observatory. We detect strong continuum emission and fine-structure emission lines from photo-dissociation and HII regions, including [OI] and [CII] lines that are dominant coolants of interstellar clouds. The observations show that the [CII]/FIR ratio is systematically low whereas the [OI]/FIR ratio is almost constant toward the Galactic center region. By using a photo-dissociation region model with observed FIR parameters, we obtain radiation an effective temperature of 6600±300K in the Galactic center region, which is significantly lower than 8600±500K in the Galactic disk region. Dominant sources of the FIR luminosity in the Galactic center region are not likely to be young OB stars but rather cool stars, K and M giants, which implies that the current star-formation activity is rather low in the Galactic center region.

Abstract Copyright:

Journal keyword(s): Galaxy: center - ISM: clouds - ISM: general - infrared: ISM

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 - 2019
#notes
1 NAME Sgr C MoC 17 44 36.3 -29 28 13           ~ 297 0
2 NAME Sgr A Region reg 17 45 12 -28 48.3           ~ 909 0
3 GCIRS 16 Cl* 17 45 40.0 -29 00 28           ~ 293 0
4 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11007 0
5 NAME Arches Cluster Cl* 17 45 50.5 -28 49 28           ~ 611 0
6 NAME Quintuplet Cluster OpC 17 46 13.9 -28 49 48           ~ 424 0
7 NAME Pistol HII 17 46 15.2 -28 49 49           ~ 59 0
8 NAME Sgr B MoC 17 47 02 -28 25.4           ~ 184 0
9 NAME Sgr B2 MoC 17 47 20.4 -28 23 07           ~ 1851 1
10 NAME Sgr D MoC 17 48 41.75 -28 01 45.0           ~ 116 1
11 NAME Galactic Bulge reg ~ ~           ~ 3233 0

    Equat.    Gal    SGal    Ecl

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2019.10.23-18:53:55

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