Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: La Freccia Rossa: An IR-dark cloud hosting the Milky Way
  intermediate-mass black hole candidate   The dynamics of the high-velocity compact molecular cloud CO-0.40-0.22 have
been interpreted as evidence for a $\sim10^{5}M_{\odot}$ black hole within 60
pc of Sgr A*. Recently, Oka et al. have identified a compact
millimetre-continuum source, CO-0.40-0.22*, with this candidate black hole.
Here we present a collation of radio and infrared data at this location. ATCA
constraints on the radio spectrum, and the detection of a mid-infrared
counterpart, are in tension with an Sgr A*-like model for CO-0.40-0.22* despite
the comparable bolometric to Eddington luminosity ratios under the IMBH
interpretation. A protostellar-disk scenario is, however, tenable.
CO-0.40-0.22(*) is associated with an arrowhead-shaped infrared-dark cloud
(which we call the Freccia Rossa). Radio-continuum observations reveal a
candidate HII region associated with the system. If the $V_{\rm LSR}\approx70$
km s$^{-1}$ systemic velocity of CO-0.40-0.22 is common to the entire Freccia
Rossa system, we hypothesise that it is the remnant of a high-velocity cloud
that has plunged into the Milky Way from the Galactic halo.

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The categories of this paper are: cmp-lg
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The categories of this paper are: chem-ph
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The categories of this paper are: adap-org
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The categories of this paper are: q-bio
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The categories of this paper are: funct-an
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The categories of this paper are: hep-lat
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The categories of this paper are: quant-ph
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The categories of this paper are: econ
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The categories of this paper are: bayes-an
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The categories of this paper are: dg-ga
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The categories of this paper are: q-fin
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The categories of this paper are: nlin
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The categories of this paper are: solv-int
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The categories of this paper are: supr-con
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The categories of this paper are: eess
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The categories of this paper are: stat