C.D.S. - SIMBAD4 rel 1.7 - 2020.07.04CEST21:27:59

2003A&A...409L..21F - Astronomy and Astrophysics, volume 409, L21-24 (2003/10-2)

Interferometric observations of FeO towards Sagittarius B2.


Abstract (from CDS):

We have used the Nobeyama Millimeter Array (NMA) to carry out aperture synthesis observations of the J=5-4 ground state rotational transition of FeO molecule at 153.135273GHz towards the galactic center HII region Sagittarius B2 Main (Sgr B2 M). We confirm the detection of this line in absorption with the IRAM 30-m telescope by Walmsley et al. ( 2002ApJ...566L.109W). Due to the higher angular resolution (6.5"x3.0") of our NMA observations, we were able to show that the absorption has a broader line width and a deeper apparent optical depth toward the central 9.2"x8.0" area around the ultra-compact (UC) HII regions. This suggests a higher column density of FeO towards the UCHII regions associated with Sgr B2 M than along adjacent lines of sight sampled with the IRAM 30-m telescope. Our results will be a crucial step toward understanding not only the chemistry of iron-bearing species in the interstellar medium, but also the degree of depletion of heavy elements.

Abstract Copyright:

Journal keyword(s): astrochemistry - ISM: abundances - HII regions - molecules - individual: Sagittarius B2 Main - techniques: interferometric

Simbad objects: 4

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Number of rows : 4

N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
1 3C 273 BLL 12 29 06.6996828061 +02 03 08.598846466   13.05 14.830 14.11   ~ 5316 1
2 NAME Sgr B2 HII F HII 17 47 20.165 -28 23 04.77           ~ 18 0
3 NAME Sgr B2 (North) Rad 17 47 20.2 -28 22 21           ~ 514 1
4 NAME Sgr B2 MoC 17 47 20.4 -28 23 07           ~ 1909 1

    Equat.    Gal    SGal    Ecl

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