Giant Radio Galaxies as a Probe of the Cosmological Evolution of the IGM I. Preliminary Deep Detections and Low-Resolution Spectroscopy with SALT

• Autorzy: Machalski J. , Kozieł-Wierzbowska D. , Jamrozy M.
• Języki publikacji: EN

Abstrakty

EN

A problem of the cosmological evolution of the intergalactic medium (IGM) is recalled and a necessity to find distant (z>0.5) "giant" radio galaxies (GRGs) with the lobe energy densities lower than about 10^-14 J/m³ to solve this problem is emphasized. Therefore we undertake a search for such GRGs on the southern sky hemisphere using SALT. In this paper we present a selected sample of the GRG candidates and the first deep detections of distant host galaxies, as well as the low-resolution spectra of the galaxies identified on the DSS frames. The data collected during the Performance Verification (P-V) phase show that 21 of 35 galaxies with the spectroscopic redshift have the projected linear size greater than 1 Mpc (for H₀=71 km/s Mpc). However their redshifts do not exceed the value of 0.4 and the energy density in only two of them is less than 10^-14 J/m³. A photometric redshift estimate of one of them (J1420-0545) suggests a linear extent larger than 4.8 Mpc, i.e., larger than that of 3C236, the largest GRG known up to now.

Słowa kluczowe

EN

Galaxies: active; Galaxies: interactions; intergalactic medium

• Wydawca: Copernicus Foundation for Polish Astronomy
• Czasopismo: Acta Astronomica
• Rocznik: 2007
• Tom: Vol. 57, No. 3
• Strony: 227--248
• Opis fizyczny: Bibliogr. 37 poz., rys., tab., wykr.

Twórcy

autor

Machalski J.

• Astronomical Observatory, Jagiellonian University, ul. Orla 171, 30-244 Kraków, Poland

autor

Kozieł-Wierzbowska D.

• Astronomical Observatory, Jagiellonian University, ul. Orla 171, 30-244 Kraków, Poland

autor

Jamrozy M.

• Astronomical Observatory, Jagiellonian University, ul. Orla 171, 30-244 Kraków, Poland

Bibliografia

• Adelman-McCarthy, J.K., et al. 2007, Astrophys. J. Suppl. Ser., 172, 634.
• Barthel, P.D. 1989, Astrophys. J., 336, 606.
• Beck, R., and Krause, M. 2005, Astron. Nachr., 326, 414.
• Becker, R.H., White, R.L., and Helfand, D.J. 1995, Astrophys. J., 450, 559.
• Becker, R.H., et al. 2001, Astrophys. J. Suppl. Ser., 135, 227.
• Bhatnagar, S., Gopal-Krishna, and Wisotzki, L. 1998, MNRAS, 299, L25.
• Blundell, K.M., Rawlings, S., and Willott, C.J. 1999, Astron. J., 117, 766.
• Bruzual, G.A. 1983, Rev. Mex. Astron. Astrofis., 8, 63.
• Colless, M.M., et al. 2001, MNRAS, 328, 1039.
• Condon, J.J., et al. 1998, Astron. J., 115, 1693.
• Cotter, G. 1998, in: “Astrophysics and space science library (ASSL)”, Eds. M.N. Bremer et al. (Dordrecht: Kluwer Academic Publishers), p. 233.
• Cotter, G., Rawlings, S., and Saunders, R. 1996, MNRAS, 281, 1081.
• Croston, J.H., Birkinshaw, M., Hardcastle, M.J., and Worrall, D.M. 2004, MNRAS, 353, 879.
• Croston, J.H., et al. 2005, Astrophys. J., 626, 733.
• Crawford, C.S., et al. 1999, MNRAS, 308, 1159.
• Gopal-Krishna, Kulkarni, V.K., and Mangalam, A.V. 1994,MNRAS, 268, 459.
• Gopal-Krishna, and Wiita, P.J. 1987, MNRAS, 226, 531.
• Hardcastle, M.J., et al. 2002, Astrophys. J., 581, 948.
• Ishwara-Chandra, C.H., and Saikia, D.J. 1999, MNRAS, 309, 100.
• Jones, D.H., Saunders, W., Read, M., and Colless, M. 2005, Proc. Astron. Soc. Aust., 22, 277.
• Kaiser, C.R., and Alexander, P. 1997, MNRAS, 286, 215.
• Kaiser, C.R., and Alexander, P. 1999, MNRAS, 305, 707.
• Konar, C., Jamrozy, M., Saikia, D.J., and Machalski, J. 2007, MNRAS, in print.
• Lara, L., et al. 2001, Astron. Astrophys., 378, 826.
• Machalski, J., and Jamrozy, M. 2006, Astron. Astrophys., 454, 95.
• Machalski, J., Jamrozy, M., and Zola, S. 2001, Astron. Astrophys., 371, 445.
• Mack, K.H., et al. 1998, Astron. Astrophys., 329, 431.
• Miley, G.K. 1980, Ann. Rev. Astron. Astrophys., 18, 165.
• Pacholczyk, A.G. 1970, “Radio Astrophysics”, Freeman and Co., San Francisco.
• Sandage, A. 1972, Astrophys. J., 178, 25.
• Scheuer, P.A.G. 1995, MNRAS, 277, 331.
• Schoenmakers, A.P., van der Laan, H., Röttgering, H.J.A., and de Bruyn, A.G. 1998, ASP Conf. Ser., 146, Eds. S. D’Odorico A., Fontana, and E. Giallongo, p.84.
• Schoenmakers, A.P., et al. 2000, Astron. Astrophys. Suppl. Ser., 146, 293.
• Stickel, M., Meisenheimer, K., and Kühr, H. 1994, Astron. Astrophys. Suppl. Ser., 105, 211.
• Strom, R.G. and Willis, A.G. 1980, Astron. Astrophys., 85, 36.
• Subrahmanyan, R. and Saripalli, L. 1993, MNRAS, 260, 908.
• Urry, C.M. and Padovani, P. 1995, P.A.S.P., 107, 803.