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Type: Conference paper
Title: The Milky Way Heart: Investigating molecular gas and γ-ray morphologies in the Central Molecular Zone
Other Titles: The Milky Way Heart: Investigating molecular gas and gamma-ray morphologies in the Central Molecular Zone
Author: Jones, D.I.
Burton, M.
Jones, P.
Walsh, A.
Rowell, G.
Aharonian, F.
Citation: Proceedings of the 25th Texas Symposium on Relativistic Astrophysics, 2011 / pp.180-1-180-7
Publisher: Proceedings of Science
Issue Date: 2011
Conference Name: 25th Texas Symposium on Relativistic Astrophysics (06 Dec 2010 - 10 Dec 2010 : Heidelberg, Germany)
Statement of
David I. Jones, Michael Burton, Paul Jones, Andrew Walsh, Gavin Rowell, and Felix Aharonian
Abstract: Since the discovery of a broad distribution of very high energy (VHE; > 0:1 TeV) gamma-rays in the Central Molecular Zone (CMZ) of the Galaxy in 2006 by the HESS collaboration, the correlation of this emission with the integrated intensity of the CS(1-0) molecular line emission has inferred a hadronic origin for the gamma-rays. Here we describe the beginning of our investigation into the strength of this correlation utilising new multi-line millimeter data from the Mopra CMZ and HOP surveys and multi-wavelength GBT radio continuum observations towards the CMZ and compare these in detail with the diffuse TeV g-ray emission from HESS. The benefit of these new data is that they allow us to simultaneously observe and analyse correlations using a large number (> 10) of molecular species, some of which contain their isotopologue pairs. The use of isotopologue pairs is especially powerful, since it allows one to analyse the optical depth of a number of different molecular species, thus investigating the nature of the correlation over a range of different physical conditions. Here we begin by comparing the integrated line emission and continuum radio emission with the diffuse g-ray emission, and, by using isotopologue pairs such as HCN/H13CN, obtain optical depths throughout the CMZ corresponding to regions of both strong and weak g-ray emission. We find that the radio continuum better matches the peak of the g-ray emission, which corresponds to the more compact – compared to the relatively coarse resolution of the g-ray images – sources in the CMZ. Using the isotopologue pairs, we find that the optical depth at all positions and velocities within the CMZ are about t 2 4. This is similar to that found for the CS(1–0) line and would underestimate the mass of the CMZ, potentially explaining why molecular line emission peaks appear offset from the g-ray peaks.
Keywords: astro-ph.HE; astro-ph.HE
Rights: © Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike Licence.
RMID: 0030045933
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Appears in Collections:Physics publications

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