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A search for the signature of microquasars in the cosmic ray iron spectrum measured by TIGER

Geier, S. and Barbier, L. M. and Binns, W. R. and Christian, E. R. and Cummings, J. R. and deNolfo, G. A. and Hink, P. L. and Israel, M. H. and Labrador, A. W. and Link, J. T. and Mewaldt, R. A. and Mitchell, J. W. and Rauch, B. F. and Schindler, S. M. and Scott, L. M. and Stone, E. C. and Streitmatter, R. E. and Waddington, C. J. (2006) A search for the signature of microquasars in the cosmic ray iron spectrum measured by TIGER. Advances in Space Research, 37 (10). pp. 1955-1959. ISSN 0273-1177. doi:10.1016/j.asr.2005.10.037.

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In a recent paper Heinz and Sunyaev suggest that relativistic jets observed in microquasars might result in narrow features in the energy spectra of heavy cosmic rays with ≈1 to ≈10 GeV/nuc. They further argue that such features might be observable if there has been one or more microquasars nearby within the last few million years. We report preliminary results of a search for evidence of such features using data from a 32-day balloon flight of the Trans-Iron Galactic Element Recorder (TIGER). Although this flight took place near solar maximum, calculations of the broadening effects of solar modulation indicate that a narrow feature of sufficient intensity should still be observable. An energy spectrum for iron with high statistical significance has been derived from ≈100,000 Fe events in the energy range from about 2.5 to 10 GeV/nuc. Although our preliminary results do not reveal any obvious features, we will discuss the possibility of observing such features with TIGER and other instruments.

Item Type:Article
Related URLs:
URLURL TypeDescription
Geier, S.0000-0002-3948-9339
Binns, W. R.0000-0001-6110-3407
Christian, E. R.0000-0003-2134-3937
Israel, M. H.0000-0002-8104-208X
Labrador, A. W.0000-0001-9178-5349
Mewaldt, R. A.0000-0003-2178-9111
Stone, E. C.0000-0002-2010-5462
Additional Information:© 2005 COSPAR. Published by Elsevier Ltd. Received 5 May 2005; received in revised form 20 October 2005; accepted 22 October 2005. This research was supported by the National Aeronautics and Space Administration under Grant NAGS-5078. It would have been impossible without the support of the National Scientific Ballooning Facilities (NSBF).
Group:Space Radiation Laboratory
Funding AgencyGrant Number
Subject Keywords:cosmic rays; microquasars
Series Name:Advances in Space Research
Issue or Number:10
Classification Code:PACS: 95.85.Ry; 07.87.+v; 98.70.Sa; 96.40.Kk; 95.30.Gv
Record Number:CaltechAUTHORS:20110601-134548173
Persistent URL:
Official Citation:S. Geier, L.M. Barbier, W.R. Binns, E.R. Christian, J.R. Cummings, G.A. deNolfo, P.L. Hink, M.H. Israel, A.W. Labrador, J.T. Link, R.A. Mewaldt, J.W. Mitchell, B.F. Rauch, S.M. Schindler, L.M. Scott, E.C. Stone, R.E. Streitmatter, C.J. Waddington, A search for the signature of microquasars in the cosmic ray iron spectrum measured by TIGER, Advances in Space Research, Volume 37, Issue 10, Astrophysics, 2006, Pages 1955-1959, ISSN 0273-1177, DOI: 10.1016/j.asr.2005.10.037. (
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:23860
Deposited By: Tony Diaz
Deposited On:02 Jun 2011 18:29
Last Modified:09 Nov 2021 16:18

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