H$\alpha$ fluxes and extinction distances for planetary nebulae in the IPHAS survey of the Northern Galactic Plane

Abstract

We report H$\alpha$ filter photometry for 197 northern hemisphere planetary nebulae (PNe) obtained using imaging data from the IPHAS survey. H$\alpha$+[N II] fluxes were measured for 46 confirmed or possible PNe discovered by the IPHAS survey and for 151 previously catalogued PNe that fell within the area of the northern Galactic Plane surveyed by IPHAS. After correcting for [N II] emission admitted by the IPHAS H$\alpha$ filter, the resulting H$\alpha$ fluxes were combined with published radio free-free fluxes and H$\beta$ fluxes, in order to estimate mean optical extinctions to 143 PNe using ratios involving their integrated Balmer line fluxes and their extinction-free radio fluxes. Distances to the PNe were then estimated using three different 3D interstellar dust extinction mapping methods, including the IPHAS-based H-MEAD algorithm of Sale (2014). These methods were used to plot dust extinction versus distance relationships for the lines of sight to the PNe; the intercepts with the derived dust optical extinctions allowed distances to the PNe to be inferred. For 17 of the PNe in our sample reliable Gaia DR2 distances were available and these have been compared with the distances derived using three different extinction mapping algorithms as well as with distances from the nebular radius vs. H$\alpha$ surface brightness relation of Frew et al. (2016). That relation and the H-MEAD extinction mapping algorithm yielded the closest agreement with the Gaia DR2 distances.

Accepted by MNRAS, 13 pages, 3 figures. Author accepted manuscript. Accepted on 04/12/2020. Deposited on 04/12/2020

References in corpus (12)

• Gaia-2MASS 3D maps of Galactic interstellar dust within 3 kpc
• The Second Data Release of the INT Photometric H-Alpha Survey of the Northern Galactic Plane (IPHAS DR2)
• The Magellanic Cloud Calibration of the Galactic Planetary Nebula Distance Scale
• A 3D extinction map of the Northern Galactic Plane based on IPHAS photometry
• Initial Data Release from the INT Photometric H-alpha Survey of the Northern Galactic Plane (IPHAS)
• First release of the IPHAS Catalogue of New Extended Planetary Nebulae
• High Spatial Resolution Galactic 3D Extinction Mapping with IPHAS
• IPHAS discoveries of young stars towards Cyg OB2 and its southern periphery
• Bayesian posterior classification of planetary nebulae according to the Peimbert types
• The "Principes de Asturias" nebula: a new quadrupolar planetary nebula from the IPHAS survey
• A deep catalogue of classical Be stars in the direction of the Perseus Arm: spectral types and interstellar reddenings
• 3-D Photoionization Structure and Distances of Planetary Nebulae III. NGC 6781

Cited by in corpus (1)

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