UVA Seal Gregory R. Sivakoff Centaurus A
Research Associate
University of Virgina Department of Astronomy

Publications

As of December 10, 2009

THESES

3. Sivakoff, G. R., ``Low-Mass X-Ray Binaries, Diffuse Gas, and Globular Clusters in Early-Type Galaxies'', 2006, Ph.D., University of Virginia
2. Sivakoff, G. R., ``MERLIN & VLA Observations of QSO 0800+608'', 2001, M.Sc., University of Manchester
1. Sivakoff, G. R., ``Computer Simulations of Blandford-Königl Parsec-Scale Jets'', 2000, B.Sc. with Highest Distinction, Brandeis University

REFEREED PUBLICATIONS:

28. Sivakoff, G. R., Jordán. A., Juett, A. M., Sarazin, C. L., Côté, P., & Irwin, J. A. ``Measurements of Variability of Low Mass X-ray Binary Candidates in the Early-Type Galaxy NGC 4697 from Multi-Epoch Chandra X-ray Observations'', 2010, ApJ (arXiv:0806.0627), submitted
27. Sivakoff, G. R., Jordán. A., Juett, A. M., Sarazin, C. L., Côté, P., & Irwin, J. A. ``Deep Chandra X-ray Observations of Low Mass X-ray Binary Candidates in the Early-Type Galaxy NGC 4697'', 2010, ApJ (arXiv:0806.0626), submitted
26. Goodger, J. L., Hardcastle, M. J., Croston, J. H., Kraft, R. P., Birkinshaw, M., Evans, D. A., Jordan, A., Nulsen, P. E. J., Sivakoff, G. R., Worrall, D. M., Brassington, N. J., Forman, W. R., Gilfanov, M., Jones, C., Murray, S. S., Raychaudhury, S., Sarazin, C. L., Voss, R., & Woodley, K. A. ``Long Term Monitoring of the Dynamics and Particle Acceleration of Knots in the Jet of Centaurus A'', 2010, ApJ, in press (arxiv:0911.2115)
25. Shankar, F. Sivakoff, G. R., Vestergaard, M., & , Dai, X. ``The relative growth of Optical and Radio Quasars in SDSS'', 2010, MNRAS, in press (arxiv:0909.4092)
24. Kim, D. -W., Fabbiano, G., Brassington, N. J., Fragos, T., Kalogera, V., Zezas, A., Jordan, A., Sivakoff, G. R., Kundu, A., Zepf, S. E., Angelini, L., Davies, R. L., Gallagher, J. S., Juett, A. M., King, A. R., Pellegrini, S., Sarazin, C. L., & Trinchieri, G. ``Comparing GC and Field LMXBs in Elliptical Galaxies with deep Chandra and Hubble data'', 2009, ApJ, 703, 829
23. Voss, R., Gilfanov, M., Sivakoff, G. R., Kraft, R. P., Jordán, A., Raychaudhury, S., Birkinshaw, M., Brassington, N. J., Croston, J. H., Evans, D. A., Forman, W. R., Hardcastle, M. J., Harris, W. E., Jones, C., Juett, A. M., Murray, S. S., Sarazin, C. L., Woodley, K., & Worrall, D. M. ``Luminosity functions of LMXBs in Centaurus A: globular clusters versus the feld'', 2009, ApJ, 701, 471
22. Martini, P. Sivakoff, G. R., & Mulchaey, J. S ``Strong Evidence for an X-ray AGN Butcher-Oemler Effect'', 2009, ApJ, 701, 66
21. Croston, J. H., Kraft, R. P., Hardcastle, M. J., Birkinshaw, M., Worrall, D. M., Nulsen, P. E. J., Penna, R. F., Sivakoff, G. R., Jordan, A., Brassington, N. J., Evans, D. A., Forman, W. R., Gilfanov, M., Goodger, J. L., Harris, W. E., Jones, C., Juett, A. M., Murray, S. S., Raychaudhury, S., Sarazin, C. L., Voss, R., & Woodley, K. A. ``High-energy particle acceleration at the radio-lobe shock of Centaurus A'', 2009, MNRAS, 395, 1999
20. Shankhar, F., Dai, X., & Sivakoff, G. R. ``Dependence of the Broad Absorption Line Quasar Fraction on Radio Luminosity'', 2008, ApJ, 687, 859
19. Sivakoff, G. R., Martini, P., Zabludoff, A. I, Kelson, D. D., & Mulchaey, J. S. ``Wide Field Chandra X-Ray Observations of AGN in Abell 85 & Abell 754'', 2008, ApJ, 682, 803
18. Mathur, S, Sivakoff, G. R., Williams, R. J., & Nicastro, F. ``On the Nature of the z=0 X-Ray Absorbers: I. Clues from an External Group'', 2008, ApSS, 315, 93
17. Kraft, R. P, Hardcastle, M. J., Sivakoff, G. R., Jordán, A., Nulsen, P. E. J., Birkinshaw, M., Forman, W. R., Jones, C., Worrall D. M., Croston, J. H., Evans, D. A., Raychaudhury, S., Murray, S. S., Brassington, N. J., Goodger, J. L., Harris, W. E., Juett, A. M., Sarazin, C. L., & Woodley, K. A. ``Evidence for Non-Hydrostatic Gas Motions in the Hot ISM of Centaurus A'', 2008, ApJL, 677, L97
16. Sivakoff, G. R., Kraft, R. P., Jordán, A., Juett, A. M., Evans, D. A., Sarazin, C. L., Birkinshaw, M., Brassington, N. J., Croston, J. H., Forman, W. R., Hardcastle, M. J., Harris, W. E., Jones, C., Murray, S. S., Raychaudhury, S., Woodley, K. A., & Worrall D. M. ``A Transient Black-Hole Low-Mass X-ray Binary Candidate in Centaurus A'', 2008, ApJL, 677, L27
15. Pepper, J., Stanek, K. Z., Pogge, R. W., Latham, D. W., DePoy, D. L., Siverd, R., Poindexter, S. Sivakoff, G. R. ``A Photometric Survey for Variables and Transits in the Field of Praesepe with KELT'', 2008, AJ, 135, 907
14. Worrall, D. M., Birkinshaw, M., Kraft, R. P., Sivakoff, G. R., Jordán, A., Hardcastle, M. J., Brassington, N. J., Croston, J. H, Evans, D. A., Forman, W. R., Harris, W. E., Jones, C., Juett, A. M., Murray, S. S., Nulsen, P. E., Raychaudhury, S., Sarazin, C. L., & Woodley, K. A. ``Where Centaurus A Gets Its X-ray Knottiness'', 2008, ApJ, 673, L135
13. Dai, X., Shankhar, F., & Sivakoff, G. R. ``2MASS Reveals a Large Intrinsic Fraction of BALQSOs'', 2008, ApJ, 672, 108
12. Jordán, A., Sivakoff, G. R., McLaughlin, D. E. Blakeslee, J. P. Evans, D. A., Kraft, R. P., Hardcastle, M. J., Peng, E. W., Côté, P., Croston, J. H, Juett, A. M., Minniti, D., Raychaudhury, S., Sarazin, C. L., Worrall, D. M., Harris, W. E., Woodley, K. A., Birkinshaw, M., Brassington, N. J., Forman, W. R., Jones, C., & Murray, S. S. ``Low-Mass X-ray Binaries and Globular Clusters in Centaurus A'', 2007, ApJL, 671, L117
11. Hardcastle, M. J., Kraft, R. P., Sivakoff, G. R., Goodger, J. L., Croston, J. H, Jordán, A., Evans, D. A., Worrall, D. M., Birkinshaw, M., Raychaudhury, S., Brassington, N. J., Forman, W. R., Harris, W. E., Jones, C., Juett, A. M., Murray, S. S., Nulsen, P. E., Sarazin, C. L., & Woodley, K. A. ``New Results on Particle Acceleration in the Centaurus A Jet and Counterjet from a Deep Chandra Observation'', 2007, ApJ, 670, L81
10. Eastman, J., Martini, P., Sivakoff, G. R., Kelson, D. D., Mulchaey, J. S., & Tran, K.-V. ``First Measurement of a Rapid Increase in the AGN Fraction in High-Redshift Clusters of Galaxies'', 2007, ApJ, 664, L9
9. Sivakoff, G. R., Jordán, A., Sarazin, C. L., Blakeslee, J. P., Côté, P., Ferrarese, L., Juett, A. M., Mei, S., & Peng, E. W. ``The Low-Mass X-ray Binary and Globular Cluster Connection in Virgo Cluster Early-type Galaxies: Optical Properties'', 2007, ApJ, 660, 1246
8. Fujita, Y., Sarazin, C. L., & Sivakoff, G. R. ``Chandra Observations of A2670 and A2107: Galaxy Clusters with Large cD Peculiar Velocities'', 2005, PASJ, 58, 131
7. Jordán, A., Côté, P., Blakeslee, J. P., Ferrarese, L., McLaughlin, D., Mei, S., Peng, E. W., Tonry, J. L., Merritt, D., Milosavljevic, M., Sarazin, C. L., Sivakoff G. R., & West, M. ``The ACS Virgo Cluster Survey. X. Half-Light Radii of Globular Clusters in Early-Type Galaxies: Environmental Dependencies and a Standard Ruler for Distance Estimation'', 2005, ApJ, 634, 1002
6. Sivakoff, G. R., & Saslaw, W. C. ``The Galaxy Distribution Function from the 2MASS Survey'', 2005, ApJ, 626, 795
5. Sivakoff, G. R., Sarazin, C. L., & Jordán. A. ``Luminous X-ray Flares From Low-Mass X-ray Binary Candidates in the Elliptical Galaxy NGC 4697'', 2005, ApJ, 624, L17
4. Sivakoff, G. R., Sarazin, C. L., & Carlin, J. L ``Chandra Observations of Diffuse Gas and Luminous X-ray Sources Around the X-ray Bright Elliptical NGC 1600'', 2004, ApJ, 617, 262
3. Sivakoff, G. R., Sarazin, C. L., & Irwin, J. A. ``Chandra Observations of Low Mass X-ray Binaries and Diffuse Gas in the Early-Type Galaxies NGC 4365 and NGC 4382 (M85)'', 2003, ApJ, 599, 218
2. Sarazin, C. L., Kundu, A., Irwin, J. A., Sivakoff, G. R., Blanton, E. L., & Randall, S. W. ``Low Mass X-ray Binaries and Globular Clusters in Early-Type Galaxies'', 2003, ApJ, 595, 743
1. Phillips, R. B., Sivakoff, G. R., Lonsdale, C. J., & Doeleman, S. S. ``Coordinated Millimeter VLBI Array Observations of R Cassiopeiae: 86 GHz SiO Masers and Envelope Dynamics'', 2001, AJ, 122, 2679

PUBLISHED CONFERENCE PROCEEDINGS:

9. Jordán. A., Sivakoff, G. R., Sarazin, C. L., Blakeslee, J. P., Blanton, E. L., Côté, P., Ferrarese, L., Irwin, J. A., Juett, A. M., Mei, S., Peng, E. W., & West, M. J. ``The Low-Mass X-Ray Binary Globular Cluster Connection in the ACS Virgo Cluster Survey'', 2009, Eso Astrophysics Symposia, Globular Clusters - Guides to Galaxies, 305
8. Hardcastle, M. J., Kraft, R. P., Goodger, J. L., Croston, J. H., Sivakoff, G. R., Jordán, A., & Evans, D. A. ``Deep Chandra Observations of the Centaurus A Jet'', 2008, ASP Conf. Ser. 386, Extragalactic Jets: Theory and Observation from Radio to Gamma Ray, 99
7. Sivakoff, G. R., Jordán. A., Juett, A. M., Sarazin, C. L., & Irwin, J. A. ``Variable Low-Mass X-ray Binaries in Early-Type Galaxies'', 2007, AIP Conference Proceedings Volume 1010, A Population Explosion: The Nature and Evolution of X-ray Binaries in Diverse Environments, 308, Contributed Talk
6. Sivakoff, G. R. ``The Low Mass X-ray Binary - Globular Connection in the HST ACS Virgo Cluster Survey'', 2006, Virginia Space Grant Consortium, Student Research Conf., http://www.vsgc.odu.edu/conf06, Contributed Talk
5. Sarazin, C. L., Sivakoff, G. R., Juett, A. M., Jordán, A., & Côté, P. ``Low Mass X-ray Binaries and Globular Clusters in Early-Type Galaxies'', 2006, ESA Publications, The X-ray Universe 2005, 409
4. Sivakoff, G. R., Jordán. A., Juett, A. M., Sarazin, C. L., & Irwin, J. A. ``Multi-epoch Observations of LMXBs in Early-type Galaxies'', 2005, IAU Symposium 230, Populations of High Energy Sources in Galaxies, 210, Contributed Talk
3. Sivakoff, G. R. ``Deep Chandra & Hubble Observations of NGC 4697, the Nearest Optically Luminous, X-ray Faint Elliptical Galaxy'', 2005, Virginia Space Grant Consortium, Student Research Conf., http://www.vsgc.odu.edu/conf05, Contributed Talk
2. Munoz, R., Carlin, J., Chatzikos, M., Hayes, A., Kanneganti, S., Mellon, R., Oishi, J., Park, C., Singhal, A., Sivakoff, G., Majewski, S. R., Skrutskie, M. F., & Sohn, S. ``Tracing Galactic Metallicity Gradients With the 2MASS Point Source Catalog'', 2004, ASP Conf. Ser. 317, Milky Way Surveys: The Structure and Evolution of our Galaxy, 283
1. Reiprich, T. H., Sarazin, C. L., Kempner, J. C., Skrutskie, M. F., Sivakoff, G. R., Boehringer, H., & Retzlaff, J. ``Cosmic Structure Traced by Precision Measurements of the X-ray Brightest Galaxy Clusters in the Sky'', 2003, AIP Conf. Proc. 666, The Emergence of Cosmic Structure, 319

POSTERS, UNPUBLISHED CONFERENCE PROCEEDINGS, & TELEGRAMS:

18. Sivakoff, G. R., Miller-Jones, J. C. A., Fox, O., Linares, M., Altamirano, D., Russell, D., & the JACPOT XRB collaboration ``Aql X-1 transition towards the soft (banana) state accompanied by radio/NIR detection'', 2009, ATEL #2302
17. Linares, M., Miller-Jones, J. C. A., Altamirano, D., Sivakoff, G. R., Maitra, D., Russell, D., Lewis. F., Markwardt, C., Remillard, R., & the JACPOT XRB collaboration ``Aql X-1 back in outburst: multi-wavelength observations'', 2009, ATEL #2288
16. Sivakoff, G. R. & the Centaurus A Very Large Project Team ``A Deep X-ray Study of X-ray Binaries in Centaurus A: Soft X-ray Transients Revealed'', 2009, Chanrda's First Decade of Discovery 197
15. Kraft, R., Forman, W. R., Jones, C., Nulsen, P. E. J., Hardcastle, M. J., Evans, D. A., Raychaudhury, S., Sivakoff, G. R., Sarazin, C., & Murray, S. S. ``An X-ray Study of the Nearby Massive Early-Type Galaxy NGC 4472'', 2009, Chanrda's First Decade of Discovery 134
14. Nulsen, P., Kraft, R. P, Stark, D., Croston, J. H., Hardcastle, M. J., Birkinshaw, M., Worrall, D. M., Sivakoff, G. R, Jordan, A., Brassington, N .J., Evans, D. A., Forman, W. R., Gilfanov, M., Goodger, J. L., Jones, C., Harris, W. E, Juett, A. M, Murray, S. S, Raychaudhury, S., Sarazin, C. L, Voss, R., Woodley, K. A ``Centaurus A: Interaction of a Radio Source with its Environment'', 2009, Chanrda's First Decade of Discovery 50
13. Sivakoff, G. R. & the Centaurus A Very Large Project Team ``A Deep X-ray Study of X-ray Binaries in Centaurus A: Soft X-ray Transients Revealed'', 2009, X-Ray Astronomy 2009: Present Status, Multi-Wavelength Approach and Future Perspectives P5.14
12. Miller-Jones, J. C. A., Sivakoff, G. R., Migliari, S., Koerding, E., Rupen, M. P., Remillard, R. A., Dhawan, V., Russell, D. M., Maitra, D., Fender, R. P., Markoff, S., Heinz, S., Sarazin, C. L., & Maccarone, T. J. ``Radio activity in H1743-322'', 2009, ATEL #2062
11. Sivakoff, G. R. & Centaurus A - Very Large Project Team ``Early Results from a Deep Chandra Observation of Centaurus A'', 2008, AAS 211
10. Jordán, A., Sivakoff, G. R., McLaughlin, D. E. Blakeslee, J. P. Evans, D. A., Kraft, R. P., Hardcastle, M. J., Peng, E. W., Côté, P., Croston, J. H, Juett, A. M., Minniti, D., Raychaudhury, S., Sarazin, C. L., Worrall, D. M., Harris, W. E., Woodley, K. A., Birkinshaw, M., Brassington, N. J., Forman, W. R., Jones, C., & Murray, S. S. ``Low-Mass X-ray Binaries and Globular Clusters in Centaurus A'', 2007, A Population Explosion: The Nature and Evolution of X-ray Binaries in Diverse Environments 42
9. Irwin, J., Sivakoff, G. R., Sarazin, C. L., Ji, J., Bregman, J. N., & Mathews, W. G. ``Revisiting the Low Metallicity Problem of the Hot ISM in X-ray Faint Early-type Galaxies'', 2006, AAS 209
8. Sivakoff, G. R., Jordán, A., Sarazin, C. L., Juett, A. M., & HST ACS Virgo Cluster Survey Team ``The Optical Properties of Globular Clusters Containing Low-Mass X-ray Binaries'', 2006, AAS HEAD 1
7. Sivakoff, G. R., Sarazin, C. L., Jordán, A., Blanton, E. L., Côté, P., Ferrarese, L., Irwin, J. A., & Juett, A. M. ``The Low-Mass X-ray Binary - Globular Connection in the HST ACS Virgo Cluster Survey'', 2005, Six Years of Science with Chandra Symposium
6. Sivakoff, G. R., Côté, P., Jordán, A., & Sarazin, C. L. ``Deep Chandra Observations of NGC 4697: Initial Results'', 2004, AAS HEAD 8
5. Sivakoff, G. R., Côté, P., Jordán, A., & Sarazin, C. L. ``Deep Chandra Observations of NGC 4697: Initial Results'', 2004, CXC Galaxies Viewed with Chandra Workshop
4. Carlin, J. L., Sarazin, C. L., & Sivakoff, G. R. ``Chandra Observations of NGC 533'', 2004, CXC Galaxies Viewed with Chandra Workshop
3. Reiprich, T. H., Sarazin, C. L., Skrutskie, M. F., Sivakoff, G. R., Chatzikos, M. N., Boehringer, H., Retzlaff, J. ``Galaxy Clusters and Large Scale Structure'', 2003, IAUS 216 Maps of the Cosmos
2. Phillips, R. B., Doeleman, S. S., Lonsdale, C. J., & Sivakoff, G. R. ``R Cassiopeiae: AGB Star Envelope Dynamics Charted by 86 GHz SiO Masers'', 2000, AAS 197
1. Sivakoff, G. R., Phillips, R. B., Lonsdale, C. J., & Doeleman, S. S. ``VLBI Imaging of the 3mm SiO Masers Around R Cassiopeia'', 1999, AAS 195

 

As of December 10, 2009

Contact G. Sivakoff Last Updated: December 8, 2009
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