J/ApJ/792/43 Detected sources in the region of Magellanic Stream (For+, 2014)
The Magellanic Stream and debris clouds.
For B.-Q., Staveley-Smith L., Matthews D., McClure-Griffiths N.M.
<Astrophys. J., 792, 43 (2014)>
=2014ApJ...792...43F 2014ApJ...792...43F (SIMBAD/NED BibCode)
ADC_Keywords: Magellanic Clouds ; Interstellar medium ; H I data
Keywords: ISM: kinematics and dynamics; Magellanic Clouds; radio lines: ISM
Abstract:
We present a study of the discrete clouds and filaments in the
Magellanic Stream using a new high-resolution survey of neutral
hydrogen (H I) conducted with the H75 array of the Australia Telescope
Compact Array, complemented by single-dish data from the Parkes
Galactic All-Sky Survey. From the individual and combined data sets,
we have compiled a catalog of 251 clouds and listed their basic
parameters, including a morphological description useful for
identifying cloud interactions. We find an unexpectedly large number
of head-tail clouds in the region. The implication for the formation
mechanism and evolution is discussed. The filaments appear to
originate entirely from the Small Magellanic Cloud and extend into the
northern end of the Magellanic Bridge.
Description:
The ATCA high-resolution MS survey covers a 500 deg2 field of the
Magellanic Stream (here after MS) using the H75 configuration of the
ATCA. MS I to MS IV, part of the SMC, and the Interface Region (IFR)
are covered in this survey. The observations were carried out over a
period from 2005 to 2006, which resulted in ∼180 hr of total observing
time. The entire area was divided into 33 regions with 154 pointing
centers per region, resulting in 5082 pointing centers. Each pointing
center was separated by 20', arranged in a hexagonal grid, observed
for 20 s, and revisited six times during an average of 10 hours of
observation. The resulting ATCA data have an angular resolution of
413''x330'', a brightness sensitivity of 210 mK and a velocity
resolution of 1.65 km/s after Hanning smoothing. The survey covers the
local standard of rest velocity (VLSR) between -315 and +393 km/s.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 116 253 Catalog of detected sources in the region
of the Magellanic Stream
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See also:
II/228 : DENIS Catalogue toward Magellanic Clouds (DCMC) (Cioni+ 2000)
J/ApJ/702/940 : Radio and UV spectra of HVC toward the MC (Lehner+, 2009)
J/ApJ/764/74 : GASS HVCs in the Magellanic Leading Arm region (For+, 2013)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- ID [1/253] Index identifier
5- 22 A18 --- Name Designation (1)
24- 28 F5.1 deg LMS Magellanic Stream longitude (2)
30- 34 F5.1 deg BMS Magellanic Stream latitude (2)
36- 41 F6.1 km/s VLSR ? Local Standard of Rest velocity
43- 48 F6.1 km/s VGSR ? Galactic Standard of Rest velocity (3)
50- 55 F6.1 km/s VLGSR ? Local Group Standard of Rest velocity (4)
57- 60 F4.1 km/s FWHM ? Velocity Full-Width at Half-Maximum (5)
62- 67 F6.1 Jy.km/s Fint ? Corrected, integrated flux
69- 73 F5.2 K TB ? Peak brightness temperature
75- 79 F5.2 10+19/cm2 NHI ? Peak H I column density
81- 83 F3.1 deg MajAxis ? Source semi-major axis
85- 87 F3.1 deg MinAxis ? Source semi-minor axis
89- 91 A3 deg PA ? Source position angle
93- 95 A3 --- Flag Warning flag (6)
97- 99 A3 --- Class Morphological classification (7)
101 A1 --- Data [G-H] Data origin flag (8)
103-116 A14 --- Comment Additional comment
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Note (1): Where the designation name is HVC l±b+VLSR.
Note (2): This new coordinate system defines LMS=0 deg. at the center of the
Large Magellanic Cloud (LMC), i.e., (l,b)=280.47 deg., -32.75 deg.
(van der Marel et al. 2002AJ....124.2639V 2002AJ....124.2639V) and the pole at (l,b)=188.5 deg.,
-7.5 deg. The LMS decreases in value toward the tip of the MS and increases
in value toward the LA.
Note (3): Defined by VGSR=220cos(b)sin(l)+VLSR.
Note (4): Defined by VLGSR=VGSR-62cos(l)cos(b)+40sin(l)cos(b)-35sin(b)
(Braun & Burton 1999A&A...341..437B 1999A&A...341..437B).
Note (5): Measured at 50% of peak flux.
Note (6): Flag as follows:
SR = the detection lies at the edge of the spectral region;
E = the detection is next to the spatial edge of the image.
Note (7): Flag as follows:
HT = head-tail cloud with velocity gradient;
:HT = head-tail cloud without velocity gradient;
S = symmetric cloud;
B = bow-shock cloud;
IC = irregular/complex cloud.
Note (8): Flag as follows:
H = H75GASS, combined ATCA data with GASS data;
G = GASS data.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Tiphaine Pouvreau [CDS] 05-Apr-2017