2018ApJ...857...59S


C.D.S. - SIMBAD4 rel 1.7 - 2020.02.17CET22:39:15

2018ApJ...857...59S - Astrophys. J., 857, 59-59 (2018/April-2)

Spitzer Infrared Spectrograph observations of the Galactic Center: quantifying the extreme ultraviolet/soft X-ray fluxes.

SIMPSON J.P.

Abstract (from CDS):

It has long been shown that the extreme ultraviolet spectrum of the ionizing stars of H II regions can be estimated by comparing the observed line emission to detailed models. In the Galactic Center (GC), however, previous observations have shown that the ionizing spectral energy distribution (SED) of the local photon field is strange, producing both very low excitation ionized gas (indicative of ionization by late O stars) and also widespread diffuse emission from atoms too highly ionized to be found in normal H II regions. This paper describes the analysis of all GC spectra taken by Spitzer's Infrared Spectrograph and downloaded from the Spitzer Heritage Archive. In it, H II region densities and abundances are described, and serendipitously discovered candidate planetary nebulae, compact shocks, and candidate young stellar objects are tabulated. Models were computed with Cloudy, using SEDs from Starburst99 plus additional X-rays, and compared to the observed mid-infrared forbidden and recombination lines. The ages inferred from the model fits do not agree with recent proposed star formation sequences (star formation in the GC occurring along streams of gas with density enhancements caused by close encounters with the black hole, Sgr A*), with Sgr B1, Sgr C, and the Arches Cluster being all about the same age, around 4.5 Myr old, with similar X-ray requirements. The fits for the Quintuplet Cluster appear to give a younger age, but that could be caused by higher-energy photons from shocks from stellar winds or from a supernova.

Abstract Copyright: © 2018. The American Astronomical Society. All rights reserved.

Journal keyword(s): Galaxy: center - X-rays: ISM - infrared: ISM - H II regions - ISM: abundances - ISM: bubbles

VizieR on-line data: <Available at CDS (J/ApJ/857/59): table2-11.dat>

Errata: erratum vol. 870, art. 140 (2019)

Simbad objects: 26

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Number of rows : 26

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 M 42 HII 05 35 17.3 -05 23 28           ~ 3684 0
2 NAME Ori A MoC 05 38 -07.1           ~ 2638 0
3 SNR G333.6-00.2 HII 16 22 11 -50 05.6           ~ 139 0
4 NAME Sgr C MoC 17 44 36.3 -29 28 13           ~ 304 0
5 SNR G359.4-00.1 SNR 17 44 37 -29 27.2           ~ 4 0
6 NAME Sgr A* X 17 45 40.03599 -29 00 28.1699           ~ 3342 3
7 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11246 0
8 [MY89] E2 Rad 17 45 46.1 -28 50 23           ~ 20 0
9 NAME Arched Filaments PoC 17 45 46.9 -28 50 39           ~ 45 1
10 NAME Arches Cluster Cl* 17 45 50.5 -28 49 28           ~ 620 0
11 NAME the Brick MoC 17 46 09 -28 43.8           ~ 132 0
12 GCM +0.10 -0.08 MoC 17 46.2 -28 54           ~ 4 0
13 LBN 000.03+00.13 HII 17 46.2 -28 51           ~ 16 0
14 NAME Quintuplet Cluster OpC 17 46 13.9 -28 49 48           ~ 435 0
15 NAME Pistol HII 17 46 15.2 -28 49 49           ~ 62 0
16 NAME Sickle HII 17 46 15.2 -28 49 49           ~ 112 0
17 [FMM95] 3 Em* 17 46 15.240 -28 50 03.58           ~ 137 1
18 NAME Galactic Center Lobe X 17 46 16.9 -28 48 52           ~ 106 0
19 NAME Galactic CENTRE LOBE Rad 17 46 18.10 -29 38 36.5           ~ 45 0
20 SNR G000.13-00.12 SN? 17 46.4 -28 53           ~ 2 1
21 GAL 000.42-00.04 X 17 46 24 -28 35.4           ~ 2 0
22 NAME Sgr B1 MoC 17 47 02.0 -28 31 57           ~ 123 0
23 NAME Sgr B MoC 17 47 02 -28 25.4           ~ 187 0
24 NAME Sgr B2 MoC 17 47 20.4 -28 23 07           ~ 1879 1
25 SNR G030.8-00.0 SNR 18 47 32 -01 56.5           ~ 430 0
26 NAME Galactic Ridge ? ~ ~           ~ 416 1

    Equat.    Gal    SGal    Ecl

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2020.02.17-22:39:15

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