Abstract
Using literature data on approximately 400 compact radio sources detected with the Very Large Array and located in the direction of the Galactic center within 2° of the compact source Sgr A*, 69 sources whose angular sizes are determined by scattering on electron density inhomogeneities were distinguished. Fifty-five of these are extragalactic, two are supercompact HII regions, ten are sources of maser emission, and two are variable Galactic sources. The excess of the apparent angular sizes of maser sources within 2° of the Galactic center above the mean size of objects of this class in other parts of the Galaxy found in many studies cannot be explained purely by the effect of scattering of their radio emission on interstellar plasma inhomogeneities. The angular sizes of these objects are increased due to scattering only within Galactic longitudes of about 0.4° and Galactic latitudes less than 0.1°. The turbulent medium responsible for scattering of radio emission of compact sources in the immediate vicinity of the Galactic center is strongly concentrated toward the compact source Sgr A* at the Galactic center. No extragalactic sources are observed within 0.4° in longitude and 0.2° in latitude of the Galactic center, because of their low brightness due to the superstrong scattering in this region. Data on scatter broadening can be used to study the distribution of turbulent plasma near the Galactic center.
Similar content being viewed by others
References
P. A. G. Scheuer, Nature 218, 920 (1968).
B. J. Rickett, Nature 221, 158 (1969).
M. Cordes, J. M. Weisberg, and V. Boriakoff, Astrophys. J. 28, 221 (1985).
A. V. Pynzar’ and V. I. Shishov, Astron. Rep. 41, 586 (1997).
A. V. Pynzar’ and V. I. Shishov, Astron. Rep. 43, 436 (1999).
A. V. Pynzar’ and V. I. Shishov, Astron. Rep. 47, 288 (2003).
A. V. Pynzar’ and V. I. Shishov, Astron. Rep. 52, 623 (2008).
A. V. Pynzar’, Astron. Rep. 54, 386 (2010).
S. S. Doeleman, J. Weintroub, A. E. E. Rogers, R. Plambeck, R. M. Ziurys, R. Freund, R. Tilanus, P. Friberg, R. M. Ziurys, J. Moran, B. Corey, K. H. Young, D. L. Smythe, M. Titus, D. P. Marrone, R. J. Cappallo, D. C.-J. Bock, G. C. Bower, R. Chamberlin, G. R. Davis, T. P. Krichbaum, J. Lamb, H. Maness, A. E. Niell, A. Roy, P. Strittmatter, D. Werthimer, A. R. Whitney, and D. Woody, Nature 455, 78 (2008).
H. J. van Langevelde, D. A. Frail, J. M. Cordes, and P. J. Diamond, Astrophys. J. 396, 686 (1992).
D. A. Frail, P. J. Diamond, J. M. Cordes, and H. J. van Langevelde, Astrophys. J. 427, L43 (1994).
F. Yusef-Zadeh, D. A. Roberts, W. M. Goss, D. A. Frail, and A. J. Green, Astrophys. J. 512, 230 (1999).
S. Johnston, M. Kramer, D. R. Lorimer, A. G. Lyne, M. McLaughlin, B. Klein, and R. N. Manchester, Mon. Not. R. Astron. Soc. 373, L6 (2006).
J. S. Deneva, J. M. Cordes, and T. J. W. Lazio, Astrophys. J. Lett. 702, L177 (2009).
R. N. Manchester, G. B. Hobbs, A. Teoh, and M. Hobbs, Astron. J. 129, 1993 (2005).
S. Zoonematkermani, D. J. Helfand, R. H. Becker, R. L. White, and R. A. Perley, Astrophys. J. Suppl. Ser. 74, 181 (1990).
D. J. Helfand, S. Zoonematkermani, R. H. Becker, and R. L. White, Astrophys. J. Suppl. Ser. 80, 211 (1992).
H. S. Liszt, Astrophys. J. Suppl. Ser. 82, 495 (1992).
R. H. Becker, R. L. White, D. J. Helfand, and S. Zoonematkermani, Astrophys. J. Suppl. Ser. 91, 347 (1994).
H. S. Liszt and R. W. Spiker, Astrophys. J. Suppl. Ser. 98, 259 (1995).
T. N. La Rosa, N. E. Kassim, T. J. W. Lazio, and S. D. Hyman, Astron. J. 119, 207 (2000).
T. J.W. Lazio and J. M. Cordes, Astrophys. J. Suppl. Ser. 118, 201 (1998).
M. E. Nord, T. J. W. Lazio, N. E. Kassim, S. D. Hyman, T. N. LaRosa, C. L. Brogan, and N. Duric, Astron. J. 128, 1646 (2004).
F. Yusef-Zadeh, J. W. Hewitt, and W. Cotton, Astrophys. J. Suppl. Ser. 155, 421 (2004).
T. J.W. Lazio and J. M. Cordes, Astrophys. J. Suppl. Ser. 174, 481 (2008).
C. J. Law, F. Yusef-Zadeh, and W. D. Cotton, Astrophys. J. Suppl. Ser. 177, 515 (2008).
R. L. White, R. H. Becker, and D. J. Helfand, Astron. J. 130, 586 (2005).
A. D. Gray, J. B. Z. Whiteoak, L. E. Cram, and W. M. Goss, Mon. Not. R. Astron. Soc. 264, 678 (1993).
G. C. Bower, D. C. Backer, and R. A. Sramek, Astrophys. J. 580, 127 (2001).
C. G. De Pree, R. A. Gaume, W. M. Goss, and M. J. Claussen, Astrophys. J. 451, 284 (1995).
D. M. Mehringer, P. Palmer, and W. M. Goss, Astrophys. J. Suppl. Ser. 97, 947 (1995).
J. J. Condon, W. D. Cotton, E. W. Greisen, Q. F. Yin, R. A. Perley, G. B. Taylor, and J. J. Broderick, Astron. J. 115, 1693 (1998).
I. P. Williamson, Mon. Not. R. Astron. Soc. 157, 55 (1972).
T. J. W. Lazio, Astrophys. J. 613, 1023 (2004).
W. Reich, E. Furst, P. Reich, and K. Reif, Astron. Astrophys. Suppl. Ser. 85, 633 (1990).
W. Reich, P. Reich, and E. Furst, Astron. Astrophys. Suppl. Ser. 83, 539 (1990).
W. J. Altenhoff, D. Downes, T. Pauls, and J. Schaml, Astron. Astrophys. Suppl. Ser. 35, 23 (1978).
W. J. Altenhoff, D. Downes, L. Goad, A. Maxwell, and R. Rinehart, Astron. Astrophys. Suppl. Ser. 1, 319 (1970).
T. Handa, Y. Sofue, N. Nakai, H. Hirabayashi, and M. Inoue, Publ. Astron. Soc. Jpn. 39, 709 (1987).
J. H. Seiradakis, W. Reich, R. Wielebinski, A. N. Lasenby, and F. Yusef-Zadef, Astron. Astrophys. Suppl. Ser. 81, 291 (1989).
Y. Sofue, M. Inoue, T. Handa, M. Tsuboi, H. Hirabayashi, M. Morimoto, and K. Akabane, Publ. Astron. Soc. Jpn. 38, 475 (1986).
R. F. Haynes, J. L. Caswell, and L. W. J. Simons, Austral. J. Phys. Astrophys. Suppl. 45, 1 (1978).
A. Broadbent, C. G. T. Haslam, and J. L. Osborne, Mon. Not. R. Astron. Soc. 237, 381 (1989).
H. Hirabayashi, Publ. Astron. Soc. Jpn. 26, 263 (1974).
T. Pauls, D. Downes, P. G. Mezger, and E. Churchwell, Astron. Astrophys. 46, 407 (1976).
D. A. Roberts and W. M. Goss, Astrophys. J. Suppl. Ser. 86, 133 (1993).
D. M. Mehringer, P. Palmer, W. M. Goss, and F. Yusef-Zadeh, Astrophys. J. 412, 684 (1993).
J. L. Hinz, G. H. Rieke, F. Yusef-Zadeh, J. Hewitt, Z. Balog, and M. Block, Astrophys. J. Suppl. Ser. 181, 227 (2009).
S. V. Ramirez, R. G. Arendt, K. Sellgren, S. R. Stolovy, A. Cotera, H. A. Smith, and F. Yusef-Zadeh, Astrophys. J. Suppl. Ser. 175, 147 (2008).
S. D. Price, M. P. Egan, S. J. Carey, D. R. Mizuno, and T. A. Kuchar, Astron. J. 121, 2819 (2001).
A. Omont, G. F. Gilmore, C. Alard, B. Aracil, T. August, K. Baliyan, S. Beaulieu, S. Begon, X. Bertou, J. A. D. L. Blommaert, J. Borsenberger, M. Burgdorf, B. Caillaud, C. Cesarsky, A. Chitre, E. Copet, B. de Batz, M. P. Egan, D. Egret, N. Epchtein, M. Felli, P. Fouque, S. Ganesh, R. Genzel, I. S. Glass, R. Gredel, M. A. T. Groenewegen, F. Guglielmo, H. J. Habing, P. Hennebelle, B. Jiang, U. C. Joshi, S. Kimeswenger, M. Messineo, M. A. Miville-Deschenes, A. Moneti, M. Morris, D. K. Ojha, R. Ortiz, S. Ott, M. Parthasarathy, M. Perault, S. D. Price, A. C. Robin, M. Schultheis, F. Schuller, G. Simon, A. Soive, L. Testi, D. Teyssier, D. Tiphene, M. Unavane, J. T. van Loon, and R. Wyse, Astron. Astrophys. 403, 975 (2003).
M. F. Skrutskie, R. M. Cutri, R. Stiening, M. D. Weinberg, S. Schneider, J. M. Carpenter, C. Beichman, R. Capps, T. Chester, J. Elias, J. Huchra, J. Liebert, C. Lonsdale, D. G. Monet, S. Price, P. Seitzer, T. Jarrett, J. D. Kirkpatrick, J. E. Gizis, E. Howard, T. Evans, J. Fowler, L. Fullmer, R. Hurt, R. Light, E. L. Kopan, K. A. Marsh, H. L. McCallon, R. Tam, S. Van Dyk, and S. Wheelock, Astron. J. 131, 1163 (2006).
E. Furst, W. Reich, and Y. Sofue, Astron. Astrophys. Suppl. Ser. 71, 63 (1987).
M. Cohen, A. J. Green, M. R. Meade, B. Babler, R. Iudebetouw, B. A. Whitney, C. Watson, M. Wolfire, M. J. Wolff, J. S. Mathis, and E. B. Churchwell, Mon. Not. R. Astron. Soc. 374, 979 (2007).
D. O. S. Wood and E. Churchwell, Astrophys. J. Suppl. Ser. 69, 831 (1989).
F. Yusef-Zadeh, J.W. Hewitt, R. G. Arendt, B. Whitney, G. Rieke, M. Wardl, J. L. Hinz, S. Stolovy, C. C. Lang, M. G. Burton, and S. Ramirez, Astrophys. J. 702, 178 (2009).
R. D. Davies, D. Walsh, J. W. A. Browne, M. R. Edwards, and R. G. Noble, Nature 261, 476 (1976).
H. J. Van Langevelde and P. J. Diamond, Mon. Not. R. Astron. Soc. 249, 7P (1991).
J. Zhao, D. A. Roberts, W. M. Goss, D. A. Frail, K. Y. Lo, R. Subrahmanyan, M. J. Kesteven, R. D. Ekers, D. A. Allen, and M. G. Burton, Science 255, 1538 (1992).
K. Y. Lo, M. H. Cohen, A. S. C. Readhead, and D. C. Backer, Astrophys. J. 249, 504 (1981).
J. M. Moran, Ph.D. Thesis (Massachusets Inst. of Technology, USA, 1968).
M.E. Nord, T. J.W. Lazio, N. E. Kassim, W.M. Goss, and N. Duric, Astrophys. J. Lett. 601, L51 (2004).
M. P. Muno, F. K. Baganoff, M. W. Bautz, W. N. Brandt, P. S. Broos, E. D. Feigelson, G. P. Garmire, M. R. Morris, G. P. Ricker, and L. K. Townsley, Astrophys. J. 589, 225 (2003).
M. P. Muno, F. E. Bauer, F. K. Baganoff, R.M. Bandyopadhyay, G. C. Bower, W. N. Brandt, P. S. Broos, A. Cotera, S. S. Eikenberry, G. P. Garmire, S. D. Hyman, N. E. Kassim, C. C. Lang, T. J. W. Lazio, C. Law, J. C. Mauerhan, M. R. Morris, T. Nagata, S. Nishiyama, S. Park, S. V. Ramirez, S. R. Stolovy, R. Wijnands, Q. D. Wang, Z. Wang, and F. Yusef-Zadeh, Astrophys. J. Suppl. Ser. 181, 110 (2009).
M. Lindqvist, A. Winnberg, H. J. Habing, and H. E. Matthews, Astron. Astrophys. Suppl. Ser. 92, 43 (1992).
Author information
Authors and Affiliations
Corresponding author
Additional information
Original Russian Text © A.V. Pynzar’, V.I. Shishov, 2014, published in Astronomicheskii Zhurnal, 2014, Vol. 91, No. 7, pp. 503–518.
Rights and permissions
About this article
Cite this article
Pynzar’, A.V., Shishov, V.I. Compact radio sources and interstellar scattering near the galactic center. Astron. Rep. 58, 427–441 (2014). https://doi.org/10.1134/S1063772914060055
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1134/S1063772914060055