MIRIS Paα Galactic Plane Survey. II. The Catalog of Paα Emission-line Sources

Abstract

Using data from the MIRIS Paα Galactic Plane Survey (MIPAPS), we present a Paα 1.87 um line image of the entire Galactic plane within the latitude range of -3° < b < +3°, revealing numerous Paα features. Based on the MIPAPS Paα image and the WISE H II region catalog, we compile a catalog of 1489 Paα emission-line sources in the Galactic plane within 90° < l < 330°. By comparing our Paα images with Hα images constructed from the IPHAS and VPHAS+ survey data, we demonstrate the advantages of Paα line observations. We identify 902 Paα sources associated with H II regions, and newly confirm 619 H II region candidates as definitive H II regions through Paα or Hα detections. We also identify 261 extended and 326 point-like Paα sources not included in the WISE catalog, most of which have Hα counterparts in the IPHAS or VPHAS+ images. A search of the SIMBAD database indicates that these sources originate from diverse object types. By measuring Paα and Hα fluxes, we estimate the E(B-V) color excesses derived from extended emissions for 138 Paα sources, showing good agreement with values obtained from spectrophotometry of ionizing stars in previous studies. Futhermore, we calculate total Lyman continuum luminosities for 42 Paα sources, providing constraints on the distances to H II regions and the spectral types of their ionizing stars. These results highlight the scientific potential of Paα line observations and the benefits of combining multiple hydrogen recombination lines in exploring ionized regions.

32 pages, 21 figures, 7 tables; accepted for publication in ApJS

References in corpus (17)

• The observed spiral structure of the Milky Way
• The VST Photometric Halpha Survey of the Southern Galactic Plane and Bulge (VPHAS+)
• The Second Data Release of the INT Photometric H-Alpha Survey of the Northern Galactic Plane (IPHAS DR2)
• The IPHAS Catalogue of Halpha Emission Line Sources in the Northern Galactic Plane
• IPHAS and the symbiotic stars. I. Selection method and first discoveries
• Catalogue of new Herbig Ae/Be and classical Be stars. A machine learning approach to Gaia DR2
• First release of the IPHAS Catalogue of New Extended Planetary Nebulae
• Gradients of chemical abundances in the Milky Way from HII regions: distances derived from Gaia EDR3 parallaxes and temperature inhomogeneities
• IPHAS discoveries of young stars towards Cyg OB2 and its southern periphery
• Newly Discovered Cataclysmic Variables from the INT/WFC Photometric H alpha Survey of the Northern Galactic Plane
• A deep catalogue of classical Be stars in the direction of the Perseus Arm: spectral types and interstellar reddenings
• Discovery of five new Galactic symbiotic stars in the VPHAS+ survey
• Classical T-Tauri stars with VPHAS+: II: NGC 6383 in Sh 2-012
• H$\alpha$ fluxes and extinction distances for planetary nebulae in the IPHAS survey of the Northern Galactic Plane
• Investigation of open clusters based on IPHAS and APASS survey data
• First Discovery and Confirmation of PN Candidates Found from AI and Deep Learning Techniques Applied to VPHAS+ Survey Data
• High-resolution Near-infrared Spectroscopy of Diffuse Sources around MWC 1080