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MIRIS Pa α Galactic Plane Survey. I. Comparison with IPHAS H α in ℓ = 96°–116°

2018; Institute of Physics; Volume: 238; Issue: 2 Linguagem: Inglês

10.3847/1538-4365/aae080

1538-4365

Il-Joong Kim, Jeonghyun Pyo, Woong-Seob Jeong, Kwang‐Il Seon, Takao Nakagawa, Min Kim, Won-Kee Park, Dae‐Hee Lee, Dukhang Lee, Bongkon Moon, Sung‐Joon Park, Young‐Sik Park, Toshio Matsumoto, Wonyong Han,

Galaxies: Formation, Evolution, Phenomena

Abstract The Multipurpose InfraRed Imaging System (MIRIS) performed the MIRIS Pa α Galactic Plane Survey (MIPAPS), which covers the entire Galactic plane within the latitude range of <?CDATA $-3^\circ \lesssim b\lesssim +3^\circ $?> at Pa α (1.87 μ m). We present the first result of the MIPAPS data extracted from the longitude range of <?CDATA ${\ell }=96\buildrel{\circ}\over{.} 5$?> –116.°3 and demonstrate the quality and scientific potential of the data by comparing them with H α maps obtained from the INT Photometric H α Survey (IPHAS) data. We newly identify 90 H ii region candidates in the WISE H ii region catalog as definite H ii regions by detecting the Pa α and/or H α recombination lines, out of which 53 H ii regions are detected at Pa α . We also report the detection of an additional 29 extended and 18 point-like sources at Pa α . We estimate the E ( B − V ) color excesses and total Lyman continuum luminosities for H ii regions by combining the MIPAPS Pa α and IPHAS H α fluxes. The E ( B − V ) values are found to be systematically lower than those estimated from point stars associated with H ii regions. Utilizing the MIPAPS Pa α and IPHAS H α images, we obtain an E ( B − V ) map for the entire region of the H ii region Sh2-131 with an angular size of ∼2.°5. The E ( B − V ) map shows not only numerous high-extinction filamentary features but also negative E ( B − V ) regions, indicating H α excess. The H α excess and systematic underestimation of E ( B − V ) are attributed to light scattered by dust.