J/ApJS/197/25 MALT90 pilot survey (Foster+, 2011)
The Millimeter Astronomy Legacy Team 90 GHz (MALT90) pilot Survey.
Foster J.B., Jackson J.M., Barnes P.J., Barris E., Brooks K.,
Cunningham M., Finn S.C., Fuller G.A., Longmore S.N., Mascoop J.L.,
Peretto N., Rathborne J., Sanhueza P., Schuller F., Wyrowski F.
<Astrophys. J. Suppl. Ser., 197, 25 (2011)>
=2011ApJS..197...25F 2011ApJS..197...25F
ADC_Keywords: Interstellar medium ; Radio lines ; Surveys ; Molecular clouds
Keywords: ISM: molecules - stars: formation - stars: massive - surveys
Abstract:
We describe a pilot survey conducted with the Mopra 22m radio
telescope in preparation for the Millimeter Astronomy Legacy Team
Survey at 90GHz (MALT90). We identified 182 candidate dense molecular
clumps using six different selection criteria and mapped each source
simultaneously in 16 different lines near 90GHz. We present a summary
of the data and describe how the results of the pilot survey shaped
the design of the larger MALT90 survey. We motivate our selection of
target sources for the main survey based on the pilot detection rates
and demonstrate the value of mapping in multiple lines simultaneously
at high spectral resolution.
Description:
We used six different input catalogs for selecting sources; three were
lists that we produced for our pilot survey and three were based on
pre-existing catalogs (Walsh et al. (2008PASA...25..105W 2008PASA...25..105W), Beltran et
al. (2006, Cat. J/A+A/447/221) and Schuller et al.
(2009A&A...504..415S 2009A&A...504..415S)). From these lists we chose 20-40 sources near
integer Galactic longitudes covering the range of longitudes
accessible from Mopra. We carried out observations for the MALT90
pilot survey in the austral winter of 2009 from June 15 to 24, the OTF
mapping mode of Mopra.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 101 182 *MALT90 pilot sources
table4.dat 118 182 *Properties of main lines at position of maximum
integrated intensity
table5.dat 33 184 *Robust (5σ) detections of lines
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Note on table3.dat, table4.dat, table5.dat: one duplicated source
(G326.989-00.032) removed, the the "History" section below.
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See also:
II/293 : GLIMPSE Source Catalog (I + II + 3D) (IPAC 2008)
J/ApJS/196/12 : First results from Mopra HCO+ maps (Barnes+, 2011)
J/ApJ/707/283 : Ionized gas toward molecular clumps (Johnston+, 2009)
J/ApJS/182/131 : Molecular clouds and clumps in the GRS (Rathborne+, 2009)
J/A+A/447/221 : Dust continuum emission from IRAS sources (Beltran+, 2006)
http://malt90.bu.edu/ : MALT90 home page
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 15 A15 --- [FJB2011] Source name (GLLL.lll+BB.bbb)
17- 23 F7.3 deg GLON Galactic longitude
24- 30 F7.3 deg GLAT Galactic latitude
32- 33 I2 h RAh Hour of Right Ascension (J2000)
35- 36 I2 min RAm Minute of Right Ascension (J2000)
38- 43 F6.3 s RAs Second of Right Ascension (J2000)
45 A1 --- DE- Sign of the Declination (J2000)
46- 47 I2 deg DEd Degree of Declination (J2000)
49- 50 I2 arcmin DEm Arcminute of Declination (J2000)
52- 56 F5.2 arcsec DEs Arcsecond of Declination (J2000)
58- 80 A23 --- Cat Catalogs (1)
82- 88 F7.2 km/s Vel1 ? Central source velocity (2)
90- 95 F6.2 km/s Vel2 ? Weaker central source velocity (3)
97-101 F5.3 K Trms Noise per channel in the spectrum (4)
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Note (1): Catalog names are:
ATLASGAL = ATLASGAL 870um (compact continuum) from Schuller et al.
(2009A&A...504..415S 2009A&A...504..415S; <[SMC2009] GLL.ll+B.bb> in Simbad)
GLIMPSE-Bright = GLIMPSE 8um (extended emission)
GLIMPSE-Dark = GLIMPSE 3.6 to 8um (dark extinction)
HOPS = HOPS 1.2cm (compact NH3 source) from Walsh et al.
(2008PASA...25..105W 2008PASA...25..105W)
MIPSGAL = MIPSCAL 24um (point source)
IRAS = IRAS+1.2mm emission from Beltran et al. (2006,
Cat. J/A+A/447/221)
Note (2): Determined by hand-examination of the four main lines for each source.
Note (3): Where two velocity components are seen.
Note (4): As measured at the central position in the map.
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 15 A15 --- [FJB2011] Source name (GLLL.lll+BB.bbb) (1)
17 A1 --- l_I(N2H+) Limit flag on IN2H+
18- 22 F5.2 K.km/s I(N2H+) ? Maximum integrated N2H+ intensity
24 A1 --- f_I(N2H+) [b] Flag on I(N2H+) (2)
26- 29 F4.2 K.km/s e_I(N2H+) ? Uncertainty in I(N2H+)
31 A1 --- l_I(HNC) Limit flag on I(HNC)
32- 36 F5.2 K.km/s I(HNC) Maximum integrated HNC intensity
38- 41 F4.2 K.km/s e_I(HNC) ? Uncertainty in I(HNC)
43 A1 --- l_I(HCO+) Limit flag on I(HCO+)
44- 48 F5.2 K.km/s I(HCO+) Maximum integrated HCO+ intensity
50- 53 F4.2 K.km/s e_I(HCO+) ? Uncertainty in I(HCO+)
55 A1 --- l_I(HCN) Limit flag on I(HCN)
56- 60 F5.2 K.km/s I(HCN) Maximum integrated HCN intensity
62- 65 F4.2 K.km/s e_I(HCN) ? Uncertainty in I(HCN)
67- 69 I3 pix x(N2H+) ? N2H+ offset from map center (3)
70- 72 I3 pix y(N2H+) ? N2H+ offset from map center (3)
74- 76 I3 pix x(HNC) ? HNC offset from map center (3)
77- 79 I3 pix y(HNC) ? HNC offset from map center (3)
81- 83 I3 pix x(HCO+) ? HCO+ offset from map center (3)
84- 86 I3 pix y(HCO+) ? HCO+ offset from map center (3)
89- 91 I3 pix x(HCN) ? HCN offset from map center (3)
92- 94 I3 pix y(HCN) ? HCN offset from map center (3)
96-100 F5.2 km/s W(HNC) ? HNC line Full-Width at Half-Maximum
102-106 F5.2 km/s e_W(HNC) ? Uncertainty in W(HNC)
108-112 F5.2 km/s W(HCO+) ? HCO+ line Full-Width at Half-Maximum
114-118 F5.2 km/s e_W(HCO+) ? Uncertainty in W(HCO+)
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Note (1): Results are listed for lines with 5σ detections in the
narrow (±2.25km/s) moment maps, but these measurements report the
moments calculated in a range of (±8.25km/s). Not all integrated
intensity measurements at 5σ results in this broader velocity range.
Note (2):
b = N2H+ is outside the spectral coverage for sources with
VLSR←100km/s.
Note (3): Offsets are (x,y) offsets in units of pixels, where each pixel is
9". Offsets are relative to the targeted center of the map, which is
determined differently for the different input surveys.
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 15 A15 --- [FJB2011] Source name (GLLL.lll+BB.bbb)
17 I1 --- N2H+ [0/1] Robust N2H+ detection code (1)
19 I1 --- 13CS [0/1] Robust 13CS detection code (1)
21 I1 --- HNC [0/1] Robust HNC detection code (1)
23 I1 --- HCO+ [0/1] Robust HCO+ detection code (1)
25 I1 --- HCN [0/1] Robust HCN detection code (1)
27 I1 --- C2H [0/1] Robust C2H detection code (1)
29 I1 --- SiO [0/1] Robust SiO detection code (1)
31 I1 --- H13CO+ [0/1] Robust H13CO+ detection code (1)
33 I1 --- H13CN [0/1] Robust H13CN detection code (1)
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Note (1): Robust detections correspond to 5σ integrated intensity
detections excluding the 3 pixels (27") on the edge of each map.
Detection statistics are not shown for H41α, CH3CN, HC3N,
13C34S, HC13CCN, HNCO 41,3 or HNCO 40,4, which have no
robust detections. One corresponds to a robust detection, zero
indicates no robust detection.
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History:
* From electronic version of the journal
* duplicated source G326.989-00.032 in tables 3/4/5 removed
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 13-Jan-2012