Investigating inner and large scale physical environments of IRAS
  17008-4040 and IRAS 17009-4042 toward l = 345.5 deg, b = 0.3 deg
  We present a multi-wavelength observational study of IRAS 17008-4040 and IRAS
17009-4042 to probe the star-formation (SF) mechanisms operational in both the
sites. Each IRAS site is embedded within a massive ATLASGAL 870 micron clump
(~2430 - 2900 M_sun), and several parsec-scale filaments at 160 micron are
radially directed toward these clumps (at T_d ~ 25 - 32 K). The analysis of the
Spitzer and VVV photometric data depicts a group of infrared-excess sources
toward both the clumps, suggesting the ongoing SF activities. In each IRAS
site, high-resolution GMRT radio maps at 0.61 and 1.28 GHz confirm the presence
of H II regions, which are powered by B-type stars. In the site IRAS
17008-4040, a previously known O-star candidate without an H II region is
identified as an infrared counterpart of the 6.7 GHz methanol maser emission
(i.e. IRcmme). Based on the VLT/NACO adaptive-optics L' image (resolution ~ 0.1
arcsec), the source IRcmme is resolved into two objects (i.e. IRcmme1 and
IRcmme2) within a scale of 900 AU that are found to be associated with the ALMA
core G345.50M. IRcmme1 is characterized as the main accreting HMPO candidate
before the onset of an ultracompact H II region. In the site IRAS 17009-4042,
the 1.28 GHz map has resolved two radio sources that were previously reported
as a single radio peak. Altogether, in each IRAS site, the junction of the
filaments (i.e. massive clump) is investigated with the cluster of
infrared-excess sources and the ongoing massive SF. These evidences are
consistent with the "hub-filament" systems as proposed by Myers (2009).
