J/A+A/538/A11 70um-1.2mm and N2H+ maps of IRDC18454 (W43) (Beuther+, 2012)
The onset of high-mass star formation in the direct vicinity of the galactic
mini-starburst W43.
Beuther H., Tackenberg J., Linz H., Henning T., Krause O., Ragan S.,
Nielbock M., Launhardt R., Schmiedeke A., Schuller F., Carlhoff P.,
Nguyen-Luong Q., Sakai T.
<Astron. Astrophys. 538, A11 (2012)>
=2012A&A...538A..11B 2012A&A...538A..11B
ADC_Keywords: Molecular clouds; Radio lines; Millimetric/submm sources
Keywords: stars: formation - stars: early-type - stars: individual: W43 -
stars: individual: IRAS18454-0158 - stars: evolution -
stars: massive
Abstract:
The earliest stages of high-mass star formation are still poorly
characterized. Densities, temperatures and kinematics are crucial
parameters for simulations of high-mass star formation. It is also
unknown whether the initial conditions vary with environment.
We want to investigate the youngest massive gas clumps in the
environment of extremely active star formation.
We selected the IRDC18454 complex, directly associated with the W43
Galactic mini-starburst, and observed it in the continuum emission
between 70um and 1.2mm with Herschel, APEX and the 30m telescope,
and in spectral line emission of N2H+ and 13CO with the Nobeyama
45m, the IRAM 30m and the Plateau de Bure Interferometer.
Description:
The cloud complex with a size of ∼6'x6' was observed with PACS on
Herschel on 2010 March 9.
Maps at 250, 350, and 500um were obtained with SPIRE 2010) on 2010
March 11.
We observed IRDC18454-1 with the Plateau de Bure Interferometer during
five nights in October and November 2009 at 93GHz in the C and D
configurations.
The N2H+ data has been observed using the BEARS receiver at the NRO
45m telescope in Nobeyama, Japan. The different velocity components
have been observed one in April 2010 with an average system
temperature of Tsys=206K, the second in June, at slightly lower
Tsys.
The MIPS 24um data (from MIPSGAL) as well as the IRAC 8um observations
(from GLIMPSE) are taken from the Spitzer archive. The 1.2mm continuum
data were first presented in Beuther et al. (2002, Cat. J/ApJ/566/945)
and the APEX 870um data are part of the ATLASGAL survey of the
Galactic plane (Schuller et al., 2009A&A...504..415S 2009A&A...504..415S).
Objects:
-------------------------------------------------------------
RA (2000) DE Designation(s)
-------------------------------------------------------------
18 47 58.0 -01 56 43 W43 = SNR G030.8-00.0
18 48 01.3 -01 54 49 IRAS 18454-0158 = GAL 030.84-00.11
-------------------------------------------------------------
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
maps.dat 132 18 Summary of FITS maps
map/* . 18 FITS maps
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See also:
J/ApJ/566/945 : Massive star forming regions at 1.2mm (Beuther+, 2002)
Byte-by-byte Description of file: maps.dat
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Bytes Format Units Label Explanations
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1- 9 F9.5 deg RAdeg Right Ascension of center (J2000)
10- 18 F9.5 deg DEdeg Declination of center (J2000)
20- 24 F5.2 arcsec/pix scale Scale of the image
28- 31 I4 pix Nx Number of pixels along X-axis
32 A1 --- --- [x]
33- 36 I4 pix Ny Number of pixels along Y-axis
43- 73 A31 --- FileName Name of FITS file (in "map" subdirectory)
81-132 A52 --- Title Tile of the file
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Acknowledgements:
Henrik Beuther, beuther(at)mpia-hd.mpg.de
(End) Patricia Vannier [CDS] 28-Nov-2011