The GBT Diffuse Ionized Gas Survey (GDIGS): Survey Overview and First Data Release
Anderson,L. D.1,2,3; Luisi,Matteo1,3; Liu,Bin1,4,5; Wenger,Trey V.6; Balser,Dana. S.7; Bania,T. M.8; Haffner,L. M.9; Linville,Dylan J.1,3; Mascoop,J. L.1,3
Source PublicationThe Astrophysical Journal Supplement Series
AbstractAbstract The Green Bank Telescope (GBT) Diffuse Ionized Gas Survey (GDIGS) traces ionized gas in the Galactic midplane by measuring 4–8 GHz radio recombination line (RRL) emission. The nominal survey zone is 32.°3 > ? > ? 5°, ∣b∣ < 0.°5, but coverage extends above and below the plane in select fields and additionally includes the areas around W47 (? ? 37.°5) and W49 (? ? 43°). GDIGS simultaneously observes 22 Hnα (15 usable), 25 Hnβ (18 usable), and 8 Hnγ RRLs (all usable), as well as multiple molecular line transitions (including those of , H2CO, and CH3OH). Here, we describe the GDIGS survey parameters and characterize the RRL data, focusing primarily on the Hnα data. We produce sensitive data cubes by averaging the usable RRLs, after first smoothing to a common spectral resolution of 0.5 km s?1 and a spatial resolution of 2.′65 for Hnα, 2.′62 for Hnβ, and 2.′09 for Hnγ. The average spectral noise per spaxel in the Hnα data cubes is ~10 mK (~5 mJy beam?1). This sensitivity allows GDIGS to detect RRLs from plasma throughout the inner Galaxy. The GDIGS Hnα data are sensitive to emission measures EM ? 1100 cm?6 pc, which corresponds to a mean electron density 〈ne〉 ? 30 cm?3 for a 1 pc path length or 〈ne〉 ? 1 cm?3 for a 1 kpc path length.
KeywordWarm ionized medium Interstellar plasma H II regions Interstellar line emission
WOS IDIOP:0067-0049-254-2-abef65
PublisherThe American Astronomical Society
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Document Type期刊论文
Corresponding AuthorAnderson,L. D.
Affiliation1.Department of Physics and Astronomy, West Virginia University, Morgantown, WV 26506, USA;
2.Green Bank Observatory, P.O. Box 2, Green Bank, WV 24944, USA
3.Center for Gravitational Waves and Cosmology, West Virginia University, Chestnut Ridge Research Building, Morgantown, WV 26505, USA
4.National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, People’s Republic of China
5.CAS Key Laboratory of FAST, NAOC, Chinese Academy of Sciences, People’s Republic of China
6.Dominion Radio Astrophysical Observatory, Herzberg Astronomy and Astrophysics Research Centre, National Research Council, P.O. Box 248, Penticton, BC V2A 6J9, Canada
7.National Radio Astronomy Observatory, 520 Edgemont Road, Charlottesville, VA 22903, USA
8.Institute for Astrophysical Research, Astronomy Department, Boston University, 725 Commonwealth Avenue, Boston, MA 02215, USA
9.Department of Physical Sciences, Embry-Riddle Aeronautical University, Daytona Beach, FL 32114, USA
Recommended Citation
GB/T 7714
Anderson,L. D.,Luisi,Matteo,Liu,Bin,et al. The GBT Diffuse Ionized Gas Survey (GDIGS): Survey Overview and First Data Release[J]. The Astrophysical Journal Supplement Series,2021,254(2).
APA Anderson,L. D..,Luisi,Matteo.,Liu,Bin.,Wenger,Trey V..,Balser,Dana. S..,...&Mascoop,J. L..(2021).The GBT Diffuse Ionized Gas Survey (GDIGS): Survey Overview and First Data Release.The Astrophysical Journal Supplement Series,254(2).
MLA Anderson,L. D.,et al."The GBT Diffuse Ionized Gas Survey (GDIGS): Survey Overview and First Data Release".The Astrophysical Journal Supplement Series 254.2(2021).
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