J/ApJS/254/36 Southern HII Region Discovery Survey. II. Full cat (Wenger+, 2021)
The Southern HII Region Discovery Survey.
II. The full catalog.
Wenger T.V., Dawson J.R., Dickey J.M., Jordan C.H., Mcclure-Griffiths N.M.,
Anderson L.D., Armentrout W.P., Balser D.S., Bania T.M.
<Astrophys. J. Suppl. Ser., 254, 36-36 (2021)>
=2021ApJS..254...36W 2021ApJS..254...36W (SIMBAD/NED BibCode)
ADC_Keywords: H II regions; Surveys; Radio continuum; Milky Way;
Infrared sources; Space velocities; Interstellar medium
Keywords: HII regions; Surveys; Radio spectroscopy; Radio continuum emission;
Galaxy structure; Milky Way dynamics; Milky Way Galaxy;
Interstellar medium
Abstract:
The Southern HII Region Discovery Survey (SHRDS) is a 900hr Australia
Telescope Compact Array 4-10GHz radio continuum and radio
recombination line (RRL) survey of Galactic HII regions and
infrared-identified HII region candidates in the southern sky. For
this data release, we reprocess all previously published SHRDS data
and include an additional ∼450hr of observations. The search for new
HII regions is now complete over the range 259°<l<346°,
|b|<4° for HII region candidates with predicted 6GHz continuum
peak brightnesses ≳30mJy/beam. We detect radio continuum emission
toward 730 targets altogether including previously known nebulae and
HII region candidates. By averaging ∼18 RRL transitions, we detect RRL
emission toward 206 previously known HII regions and 436 HII region
candidates. Including the northern sky surveys, over the last decade
the HII Region Discovery Surveys have more than doubled the number of
known Galactic HII regions. The census of HII regions in the
Wide-field Infrared Survey Explorer (WISE) Catalog of Galactic HII
Regions is now complete for nebulae with 9 GHz continuum flux
densities ≳250mJy. We compare the RRL properties of the newly
discovered SHRDS nebulae with those of all previously known HII
regions. The median RRL FWHM line width of the entire WISE Catalog HII
region population is 23.9km/s and is consistent between Galactic
quadrants. The observed Galactic longitude-velocity asymmetry in the
population of HII regions probably reflects underlying spiral
structure in the Milky Way.
Description:
The observing strategy and data processing procedure for the Full
Catalog are similar to that of Paper I (Wenger+ 2019ApJS..240...24W 2019ApJS..240...24W).
We used the ATCA C/X-band receiver and Compact Array Broadband Backend
(CABB) to simultaneously observe 4-8GHz radio continuum emission and
20 hydrogen radio recombination line (RRL) transitions in two
orthogonal linear polarizations (note that Paper I incorrectly states
that circular polarizations were observed). Our observations took
place between 2015 June and 2019 January with a total of 900hr of
telescope time split equally between the H75 and H168 antenna
configurations. We observed each field for a total of ∼30 to ∼90min in
∼5 to ∼10 minute snapshots spread over ∼9 hours in hour angle.
See Section 3.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 96 1829 Full catalog fields and targets
table5.dat 125 20646 Un-smoothed continuum detections
table6.dat 125 18717 Smoothed continuum detections
table7.dat 121 26167 Un-smoothed peak RRL detections
table8.dat 121 24044 Smoothed peak RRL detections
table9.dat 121 26946 Un-smoothed total RRL detections
table10.dat 121 24204 Smoothed total RRL detections
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See also:
VII/20 : Catalogue of HII Regions (Sharpless 1959)
VII/216 : H-α emission regions in Southern Milky Way (Rodgers+ 1960)
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/91/347 : A 5-GHz VLA Survey of the Galactic Plane (Becker+ 1994)
J/ApJS/165/338 : Radio recombination lines in HII regions (Quireza+, 2006)
J/ApJS/194/32 : The HII Region Discovery Survey (HRDS). II. (Anderson+, 2011)
J/ApJ/738/27 : Galactic HII regions RRL and continuum data (Balser+, 2011)
J/ApJ/754/62 : HRDS III. HII region kinematic distances (Anderson+, 2012)
J/ApJ/764/34 : HRDS IV. H, He and C radio recombination lines (Wenger+, 2013)
J/ApJS/212/1 : The WISE catalog of Galactic HII regions (Anderson+, 2014)
J/ApJS/221/26 : Radio obs. of Galactic WISE HII regions (Anderson+, 2015)
J/A+A/594/A116 : HI4PI spectra and column density maps (HI4PI team+, 2016)
J/AJ/154/23 : Southern HII Region Discovery Survey: pilot (Brown+, 2017)
J/ApJS/234/33 : A GBT survey of large Galactic HII regions (Anderson+, 2018)
J/ApJS/240/14 : SIGGMA: inner galaxy data release (Liu+, 2019)
J/ApJ/885/131 : ∼200 high-mass SFR plx & proper motion with VLBI (Reid+, 2019)
J/ApJ/887/114 : VLA ∼8-10GHz obs. of WISE Galactic HII regions (Wenger+, 2019)
J/ApJS/248/3 : A 4-6GHz RRL survey in the Milky Way (Chen+, 2020)
J/ApJS/253/23 : VLA 9GHz obs. of HII region candidates (Armentrout+, 2021)
http://astro.phys.wvu.edu/wise/ : The online WISE Cat. of Gal. HII Regions v2.4
http://www.cadc-ccda.hia-iha.nrc-cnrc.gc.ca/en/community/shrds/ : SHRDS home
http://doi.org/10.11570/21.0002 : Data product archive
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 15 A15 --- Field Field identifier
17- 18 I2 h RAFh Field center Hour of Right Ascension (J2000)
20- 21 I2 min RAFm Field center Minute of Right Ascension (J2000)
23- 26 F4.1 s RAFs Field center Second of Right Ascension (J2000)
28 A1 --- DEF- Sign of the field center Declination (J2000)
29- 30 I2 deg DEFd Field center Degree of Declination (J2000)
32- 33 I2 arcmin DEFm Field center Arcminute of Declination (J2000)
35- 38 F4.1 arcsec DEFs Field center Arcsecond of Declination (J2000)
40- 54 A15 --- Name WISE Catalog target identifier (G1)
56 A1 --- Cl [CGKQ] WISE Catalog classification (1)
58- 59 I2 h RAh Target Hour of Right Ascension (J2000)
61- 62 I2 min RAm Target Minute of Right Ascension (J2000)
64- 67 F4.1 s RAs Target Second of Right Ascension (J2000)
69 A1 --- DE- Sign of Target Declination (J2000)
70- 71 I2 deg DEd Target Degree of Declination (J2000)
73- 74 I2 arcmin DEm Target Arcminute of Declination (J2000)
76- 79 F4.1 arcsec DEs Arcsecond of Declination (J2000)
81- 87 F7.2 arcsec RadIR [7.6/3362] WISE Infrared radius, RIR
89- 96 A8 --- Ref Reference code (2)
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Note (1): Classification as follows:
K = known H II region;
C = H II region candidate;
Q = radio-quiet H II region candidate;
G = H II candidate associated with an H II region group.
Note (2): Reference code as follows:
GBT HRDS = Anderson+ (2011, J/ApJS/194/32 ; 2015, J/ApJS/221/26 and
2018, J/ApJS/234/33)
B11 = Balser et al. (2011, J/ApJ/738/27)
CH87 = Caswell & Haynes (1987, J/A+A/171/261)
D80 = Downes et al. (1980A&AS...40..379D 1980A&AS...40..379D)
L89 = Lockman (1989ApJS...71..469L 1989ApJS...71..469L ; Cat. VIII/58)
Q06 = Quireza et al. (2006, J/ApJS/165/338)
S04 = Sewilo et al. (2004ApJ...605..285S 2004ApJ...605..285S)
W70 = Wilson et al. (1970A&A.....6..364W 1970A&A.....6..364W)
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Byte-by-byte Description of file: table[56].dat
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Bytes Format Units Label Explanations
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1- 15 A15 --- Name HII region name (G1)
17- 18 I2 h RAh Hour of Right Ascension (J2000)
20- 21 I2 min RAm Minute of Right Ascension (J2000)
23- 26 F4.1 s RAs Second of Right Ascension (J2000)
28 A1 --- DE- Sign of the Declination (J2000)
29- 30 I2 deg DEd Degree of Declination (J2000)
32- 33 I2 arcmin DEm Arcminute of Declination (J2000)
35- 38 F4.1 arcsec DEs Arcsecond of Declination (J2000)
40- 54 A15 --- Field Field identifier
56 A1 --- QF Continuum detection quality factor
(A=highest) (1)
58- 64 F7.1 MHz nu [4392.4/10828.7] Frequency
66- 69 I4 MHz Delnu [256/4000] Bandwidth
71- 75 F5.2 arcmin2 BArea [0.19/10.3] Synthesized beam area
77- 85 F9.2 mJy/beam ScP [-2904/457877]? Source peak continuum
brightness
87- 97 F11.2 mJy/beam e_ScP [0.01/5.6e+7]? Uncertainty in ScP
99- 105 F7.2 arcmin2 RArea [0.01/4013]? Watershed region area
107- 115 F9.2 mJy ScT [0.01/146544]? Source total continuum flux
density
117- 125 F9.2 mJy e_ScT [0.01/725465]? Uncertainty in ScT
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Note (1): The QF is a qualitative assessment of the reliability of the measured
source continuum properties. Code as follows:
A = the highest quality detections: unresolved, isolated, and near the
center of the field.
B = Intermediate quality detections:
(1) resolved yet compact with a single emission peak,
(2) slightly confused, such that its watershed region borders another
source's watershed region, and/or
(3) located off-center in the field.
C = The worst quality detections: unreliable continuum properties because
they are
(1) resolved and the emission is not compact with a single, distinct
peak,
(2) severely confused with other sources, and/or
(3) located near the edge of the field.
We recommend using only the QF A and B data in subsequent analyses of
these data, but we include the QF C data for completeness.
See Section 4.1.
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Byte-by-byte Description of file: table[789].dat table10.dat
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Bytes Format Units Label Explanations
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1- 15 A15 --- Name HII region name (G1)
17- 31 A15 --- Field Field identifier
33- 41 A9 --- RRL Radio recombination line (s) (1)
43- 49 F7.1 MHz nu [-4156/17282] RRL rest frequency (2)
51 A1 --- Comp Gaussian velocity component identifier (3)
53- 60 F8.2 mJy/beam SL [0/65837]? Gaussian peak RRL brightness
62- 68 F7.2 mJy/beam e_SL [0/3609]? Uncertainty in SL
70- 76 F7.2 km/s VLSR [-269/191]? Fitted local Standard of Rest
velocity
78- 82 F5.2 km/s e_VLSR [0/41]? Uncertainty in VLSR
84- 89 F6.2 km/s DelV [5/164]? Fitted full-width at half-maximum
line width, ΔV
91- 95 F5.2 km/s e_DelV [0.04/89]? Uncertainty in DelV
97- 106 F10.2 mJy/beam SC [-113077/337152] Continuum brightness
108- 115 F8.2 mJy/beam e_SC [0/41274] Uncertainty in SC
117- 121 F5.1 --- SNR [2.3/770]? Signal-to-Noise (4)
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Note (1): RRL ranges indicate average RRL spectra, but only of those RRL
transitions within that range that are in this table (i.e., H90
is not included in the H88-H112 average).
Note (2): For average RRL spectra, the weighted average RRL rest frequency.
Note (3): Where "a" is the brightest Gaussian component,
"b" is the second brightest, etc.
Note (4): The S/N is estimated following Lenz & Ayres (1992PASP..104.1104L 1992PASP..104.1104L):
Equation (2): S/N=0.7(SL/rms)(ΔV/Δν)0.5
where rms is the spectral rms and Δν is the channel width.
See Section 4.2.
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Global note:
Note (G1): the WISE Catalog (Anderson+ 2014, J/ApJS/212/1) source name;
<[ABB2014] WISE GLLL.lll+BB.bbb> in Simbad
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History:
From electronic version of the journal
References:
Brown et al. Pilot survey. 2017AJ....154...23B 2017AJ....154...23B Cat. J/AJ/154/23
Wenger et al. Paper I. 2019ApJS..240...24W 2019ApJS..240...24W
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 01-Mar-2023