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Correlation between SiO and X-ray emission in the galactic center

Amo-Baladrón, M. A. and Martín-Pintado, J. and Morris, M. R. and Muno, M. P. and Rodríguez-Fernández, N. J. (2008) Correlation between SiO and X-ray emission in the galactic center. Journal of Physics: Conference Series, 131 . Art. No. 012017. ISSN 1742-6596. doi:10.1088/1742-6596/131/1/012017.

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We present emission maps (spatial resolution ~40") of the Sgr A molecular cloud complex at the Galactic Center (GC) in the J = 2→1 SiO line, observed with the IRAM-30m telescope at Pico Veleta. We have compared our SiO(2-1) data cube with CS(1-0) maps, and we have found a correlation between the SiO/CS intensity ratio and the equivalent width of the X-ray Fe line at 6.4 keV. We discuss the SiO abundance enhancement in the two most plausible scenarios for the origin of the Fe line, which is, at the moment, under debate: fluorescence in an X-ray Reflection Nebula (XRN), or impact by Low-Energy Cosmic Rays (LECRs) followed by electronic relaxation. Both could explain the enhancement in the SiO/CS intensity ratio with the intensity of the Fe line, but both scenarios present difficulties: the first one requires a population of very small grains to produce the enhancement in the SiO/CS intensity ratio, and the second needs higher column densities than the ones derived from observations in the region.

Item Type:Article
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Morris, M. R.0000-0002-6753-2066
Additional Information:© 2008 IOP Publishing Ltd. Accepted papers received: 30 September 2008. Published online: 24 October 2008. We wish to thank Prof. M. Tsuboi for kindly providing the CS(1-0) data. This work has been supported by the Spanish Ministerio de Educacion y Ciencia under projects ESP 2004-00665 and ESP2007-65812-C02-01 and the “Comunidad de Madrid” Government under PRICIT project S-0505/ESP-0237 (ASTROCAM).
Funding AgencyGrant Number
Ministerio de Educación y Ciencia (MEC)ESP 2004-00665
Ministerio de Educación y Ciencia (MEC)ESP2007-65812-C02-01
Comunidad de MadridS-0505/ESP-0237 (ASTROCAM)
Record Number:CaltechAUTHORS:20090910-100004918
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Official Citation:Correlation between SiO and X-ray emission in the galactic center M A Amo-Baladrón, J Martín-Pintado, M R Morris, M P Muno and N J Rodríguez-Fernández 2008 J. Phys.: Conf. Ser. 131 012017 (8pp) doi: 10.1088/1742-6596/131/1/012017.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:15721
Deposited By: Tony Diaz
Deposited On:02 Oct 2009 15:54
Last Modified:12 Jul 2022 19:41

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