J/ApJS/240/14 SIGGMA: inner galaxy data release (Liu+, 2019)
Survey of Ionized Gas of the Galaxy, Made with the Arecibo telescope (SIGGMA):
inner galaxy data release.
Liu B., Anderson L.D., McIntyre T., Roshi D. A., Churchwell E.,
Minchin R., Terzian Y.
<Astrophys. J. Suppl. Ser., 240, 14 (2019)>
=2019ApJS..240...14L 2019ApJS..240...14L
ADC_Keywords: H II regions; Radio lines; Surveys
Keywords: catalogs ; H II regions ; radio lines: ISM ; surveys
Abstract:
The Survey of Ionized Gas of the Galaxy, Made with the Arecibo
telescope (SIGGMA) provides a fully sampled view of the radio
recombination line (RRL) emission from the portion of the Galactic
plane visible with Arecibo. Observations use the Arecibo L-band Feed
Array, which has a FWHM beam size of 3.4'. Twelve hydrogen RRLs from
H163α to H174α are located within the instantaneous
bandpass from 1225MHz to 1525MHz. We provide here cubes of average
("stacked") RRL emission for the inner Galaxy region
32°≤l≤70°, |b|≤1.5°, with an angular resolution of 6'.
The stacked RRL rms at 5.1km/s velocity resolution is ∼0.65mJy/beam,
making this the most sensitive large-scale fully sampled RRL survey
extant. We use SIGGMA data to catalog 319 RRL detections in the
direction of 244 known HII regions, and 108 new detections in the
direction of 79 HII region candidates. We identify 11 carbon RRL
emission regions, all of which are spatially coincident with known HII
regions. We detect RRL emission in the direction of 14 of the 32
supernova remnants (SNRs) found in the survey area. This RRL emission
frequently has the same morphology as the SNRs. The RRL velocities
give kinematic distances in agreement with those found in the
literature, indicating that RRLs may provide an additional tool to
constrain distances to SNRs. Finally, we analyze the two bright
star-forming complexes: W49 and W51. We discuss the possible origins
of the RRL emission in directions of SNRs W49B and W51C.
Description:
We described the observations and data reduction in full in Paper I
(Liu+ 2013AJ....146...80L 2013AJ....146...80L).
We used the seven-beam Arecibo L-band Feed Array (ALFA) receiver for
the Survey of Ionized Gas of the Galaxy, Made with the Arecibo
telescope (SIGGMA) observations. The observations started in 2010.
The receiver has a bandwidth of 300MHz, covering 1225-1525MHz.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 79 319 Catalog of 319 radio recombination line (RRL)
detections towards 244 "known" HII regions
from the WISE catalog
(Anderson+, 2014, J/ApJS/212/1)
table3.dat 73 108 Catalog of 108 RRL detections towards
79 "candidate" HII regions from the WISE catalog
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See also:
VIII/64 : Westerhout's Catalogue of 82 Discrete Sources (Westerhout 1958)
VIII/58 : A Survey of Radio H II Regions in the Northern Sky (Lockman+ 1989)
J/A+A/171/261 : RRLs of Southern HII Regions (Caswell+ 1987)
J/ApJS/165/338 : Radio recombination lines in HII regions (Quireza+, 2006)
J/ApJ/694/546 : IR dust bubbles. II. YSOs model parameters (Watson+, 2009)
J/ApJ/720/1055 : VBLA observations of W51 Main/South (Sato+, 2010)
J/ApJS/194/32 : The HII Region Discovery Survey (HRDS). II. (Anderson+, 2011)
J/ApJS/212/1 : The WISE catalog of Galactic HII regions (Anderson+, 2014)
J/ApJ/783/130 : Parallaxes of high mass star forming regions (Reid+, 2014)
J/MNRAS/450/2025 : HIPASS-ZoA HII regions (Alves+, 2015)
J/ApJS/221/26 : Radio obs. of Galactic WISE HII regions (Anderson+, 2015)
J/ApJS/234/33 : A GBT survey of large Galactic HII regions (Anderson+, 2018)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 15 A15 --- Name Identifier (GLLL.lll+BB.bbb) (G1)
17 A1 --- f_Name [ab] Flag on Name (1)
19- 24 F6.3 deg GLON [32.8/64.2] Galactic longitude
26- 31 F6.3 deg GLAT [-1.4/1.5] Galactic latitude
33- 38 F6.2 mJy/beam Peak [1.9/471] Arecibo/ALFA peak flux
40- 45 F6.2 mJy/beam e_Peak [0.1/108] Uncertainty in Peak
47- 51 F5.1 km/s VLSR [-46.1/119] Local Standard of Rest velocity
53- 57 F5.1 km/s e_VLSR [0.1/114] Uncertainty in VLSR
59- 62 F4.1 km/s FWHM [12/98] Full-Width at Half-Maximum
64- 67 F4.1 km/s e_FWHM [0.3/91] Uncertainty in FWHM
69- 73 F5.2 mJy/beam RMS [0.3/30.5] RMS
75- 79 F5.1 --- S/N [5/102] Signal-to-Noise
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Note (1): Flag as follows:
a = Detections arise from positions with multiple ALFA beam.
b = For the source G037.028-00.202, the VLSR component at -40km/s is
possible to be the helium conterpart of the H-RRL at 85.4km/s.
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 15 A15 --- Name Identifier (GLLL.lll+BB.bbb) (G1)
17 A1 --- f_Name [abc] Flag on Name (1)
19- 24 F6.3 deg GLON [33/68] Galactic longitude
26- 31 F6.3 deg GLAT [-1.1/1.6] Galactic latitude
33- 37 F5.2 mJy/beam Peak [1.4/54] Arecibo/ALFA peak flux
39- 42 F4.2 mJy/beam e_Peak [0.1/10] Uncertainty in Peak
44- 48 F5.1 km/s VLSR [-29.2/115] Local Standard of Rest velocity
50- 53 F4.1 km/s e_VLSR [0.3/25] Uncertainty in VLSR
55- 58 F4.1 km/s FWHM [12/88] Full-Width at Half-Maximum
60- 63 F4.1 km/s e_FWHM [0.7/25] Uncertainty in FWHM
65- 68 F4.2 mJy/beam RMS [0.1/4.6] RMS
70- 73 F4.1 --- S/N [5/51] Signal-to-Noise
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Note (1): Flag as follows:
a = Detections arise from positions with multiple ALFA beam.
b = Detections integrated over the entire H II region also includes
positions from overlapping "known" or "candidate" H II regions.
c = For the source G039.515+00.511, we fit the VLSR component at -29.2km/s
manually since it is outside the automatic Gaussian fitting range.
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Global notes:
Note (G1): HII region identifiers from the WISE catalog
Anderson+, 2014, J/ApJS/212/1 ; <[ABB2014] WISE GLLL.lll+BB.bbb> in Simbad).
History:
From electronic version of the journal
References:
Liu et al. Paper I. 2013AJ....146...80L 2013AJ....146...80L
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 10-May-2019