Global photometric analysis of galactic HII regions

Abstract

Total infrared fluxes are estimated for 99 HII regions around massive stars. The following wavebands have been used for the analysis: 8 and 24 $\mu$m, based on data from Spitzer space telescope (IRAC and MIPS, respectively); 70, 160, 250, 350, and 500 $\mu$m, based on data from Herschel Space Observatory (PACS and SPIRE). The estimated fluxes are used to evaluate the mass fraction of polycyclic aromatic hydrocarbons ($q_{\mathrm{PAH}}$) and the intensity of the ultraviolet emission in the studied objects. It is shown that the PAH mass fraction, $q_{\mathrm{PAH}}$, is much lower in these objects than the average Galactic value, implying effective destruction of aromatic particles in HII regions. Estimated radiation field intensities ($U$) are close to those derived for extragalactic HII complexes. Color indices [$F_{24}$/$F_8$], [$F_{70}$/$F_{24}$], [$F_{160}$/$F_{24}$], [$F_{160}$/$F_{70}$] are compared to criteria proposed to distinguish between regions of ionized hydrogen and planetary nebulae. Also, we relate our results to analogous color indices for extragalactic complexes of ionized hydrogen.

arXiv comment12pages, 3 figures, accepted for publication in Research in Astronomy and Astrophysics

References in corpus (26)

• Astropy: A Community Python Package for Astronomy
• The Infrared Array Camera (IRAC) for the Spitzer Space Telescope
• The Photodetector Array Camera and Spectrometer (PACS) on the Herschel Space Observatory
• The Herschel-SPIRE instrument and its in-flight performance
• Infrared Emission from Interstellar Dust. IV. The Silicate-Graphite-PAH Model in the Post-Spitzer Era
• Toward Understanding Massive Star Formation
• Common-Resolution Convolution Kernels for Space- and Ground-Based Telescopes
• The WISE Catalog of Galactic HII Regions
• The Milky Way Project First Data Release: A Bubblier Galactic Disk
• On Radiation Pressure in Static, Dusty HII Regions
• The relations among 8, 24, and 160 micron dust emission within nearby spiral galaxies
• The Dust Properties of Bubble HII Regions as seen by Herschel
• Triggered massive-star formation on the borders of Galactic HII regions. IV- Star formation at the periphery of Sh2-212
• Near-IR integral field spectroscopy of ionizing stars and young stellar objects on the borders of HII regions
• Interstellar matter and star formation in W5-E - A Herschel view
• Spitzer and Herschel multiwavelength characterization of the dust content of evolved HII regions
• Bipolar HII regions - Morphology and star formation in their vicinity - I - G319.88$+$00.79 and G010.32$-$00.15
• Distinguishing between HII regions and planetary nebulae with Hi-GAL, WISE, MIPSGAL, and GLIMPSE
• PAH Strength and the Interstellar Radiation Field around the Massive Young Cluster NGC3603
• Infrared Emission and the Destruction of Dust in HII regions
• The RMS Survey: H2O masers towards a sample of southern hemisphere massive YSO candidates and ultra compact HII regions
• Dust dynamics and evolution in expanding HII regions. I. Radiative drift of neutral and charged grains
• Dust dynamics and evolution in HII regions - II. Effects of dynamical coupling between dust and gas
• Polycyclic aromatic hydrocarbons in spatially resolved extragalactic star forming complexes
• The Infrared and Radio Fluxes Densities of Galactic HII Regions
• Infrared Morphology of Regions of Ionized Hydrogen

Cited by in corpus (3)

• Molecular envelope around the HII region RCW 120
• JWST Observations of Starbursts: Dust Processing in the M82 Superwind
• Infrared Photometric Properties of Inner and Outer Parts of HII regions