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The spectral variation, the correlation of multi-waveband flux and the property of polarization of BL Lac objects give us important information for studying their intrinsic correlation of radiation components. The present paper analyzes the properties of RBLs and XBLs. It is indicated by statistics that the redshift of RBLs are greater than that of XBLs and the black hole mass of RBLs are smaller than that of XBLs. The paper also studies the possible correlations between the redshift and the flux densities for different wavebands in low state, and the possible correlations of flux densities for different wavebands (radio, near-infrared, optical and X-ray) in low state. The results support that the systematic difference between RBLs and XBLs is not caused by the choice effect only.
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Keywords:
- BL Lac objects /
- multi-waveband flux
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[5] [5]Heidt J, Wagner S J 1998 A&A 329 853
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[8] [8]Xie G Z, Zhang X, Bai J M, Xie Z H 1998 ApJ 508 180
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[15] ] Kaspi S, Smith P S, Netzer H, Maoz D, Jannuzi B T, Giveon U 2000 ApJ 533 631
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[19] ] Wu X B, Liu F K, Zhang T Z 2002 A&A 389 742
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[22] ] Data from the University of Michigan Radio Astronomy Observatory
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[35] ]Takalo L O, Kidger M R, de Diego J A, Sillanpaa A, Nilsson K 1992 AJ 104 40
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[39] ]Fan J H, Feng X H, Su C Y 1999 PyunO 2 1
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[41] ]Kidger M R,de Diego J A 1992 A&AS 93 1
[42] ]Hec kman T M, Lebofsky M J, Rieke G H, van Breugel W 1983 ApJ 272 400
[43] ]Bersanelli M, Bouchet P, Falomo R, Tanzi E G 1992 AJ 104 28
[44] ]Bregman J N, Glassgold A E, Huggins P J, Neugebauer G, Soifer B T, Matthews K, Elias J H, Webb J R, Pollock J T, Leacock R J 1990 ApJ 352 574
[45] ]Brown L M J, Robson E I, Gear W K, Hughes D H, Griffin M J, Geldzahler B J, Schwartz P R, Smith M G, Smith A G, Shepherd D W 1989 ApJ 340 129
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[47] ]Falomo R, Scarpa R, Bersanelli M 1994 ApJS 93 125
[48] ]Madau P, Ghisellini G, Persic M 1987 MNRAS 224 257
[49] ]Fan J H, Lin R G 2000 ApJ 537 101
[50] ]Wills B J, Wills D, Evans N J II, Natta A, Thompson K L, Breger M, Sitko M L 1992 ApJ 400 96
[51] ] Mufson S L, Hutter D J, Hackney K R H, Hackney R L, Kondo Y, Mushotzky R F, Urry C M, Wisniewski W Z, Aller M F, Aller H D 1982 NASCP 2238 185
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[53] ]Ledden J E, Odell S L, Stein W A, Wisniewski W Z 1981 ApJ 243 47
[54] ]Webb J R, Smith A G, Leacock R J, Fitzgibbons G L, Gombola P P, Shepherd D W 1988 AJ 95 374
[55] ]Odell S L, Puschell J J, Stein W A, Owen F, Porcas R W, Mufson S, Moffett T J, Ulrich M H 1978 ApJ 224 22
[56] ]Westerlund B E, Wlerick G, Garnier R 1982 A&A 105 284
[57] ]Oke J B, Goodrich R W 1981 ApJ 243 445
[58] ]Wall J V, Peacock J A 1985 MNRAS 216 173
[59] ]Angione R J 1971 AJ 76 412
[60] ]Sambruna R M, Maraschi L, Urry C M 1996 ApJ 463 444
[61] ]Lamer G, Brunner H, Staubert R 1996 A&A 311 384
[62] ]Madejski G M, Schwartz D A 1983 ApJ 275 467
[63] ]Urry C M, Sambruna R M, Worrall D M, Kollgaard R I, Feigelson E D, Perlman E S, Stocke J T 1996 ApJ 463 424
[64] ]Treves A, Belloni T, Falomo R, Fink H, Maraschi L, Sambruna R M, Tagliaferri G, Zimmermann H U 1993 ApJ 406 447
[65] ]Bloom S D, Marscher A P, Moore E M, Gear W, Tersranta H, Valtaoja E, Aller H D, Aller M F 1999 ApJS 122 1
[66] ]Fichtel C E 1994 ApJS 90 917
[67] ]Sambruna R M 1997 ApJ 487 536
[68] ]Sambruna R M, Barr P, Giommi P, Maraschi L, Tagliaferri G, Treves A 1994 ApJ 434 468
[69] ]Giommi P, Ansari S G, Micol A 1995 A&AS 109 267
[70] ]Makino F 1989 ESASP 296 803
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[1] [1]Blandford R D, Rees M J 1978 Phys. 17 265
[2] [2]Stickel M, Padovani P, Urry C M, Fried J W, Kuehr H 1991 ApJ. 374 431
[3] [3] Stocke J T, Morris S L, Gioia I M, Maccacaro T, Schild R, Wolter A, Fleming T A, Henry J P 1991 ApJS 76 813
[4] [4]Stocke J T, Liebert J, Schmidt G, Gioia I M, Maccacaro T, Schild R E, Maccagni D, Arp H C 1985 ApJ 298 619
[5] [5]Heidt J, Wagner S J 1998 A&A 329 853
[6] [6]Bai J M, Xie G Z, Li K H, Zhang X, Liu W W 1998 A&AS 132 83
[7] [7]Morris S L, Stocke J T, Gioia I M, Schild R E, Wolter A, Maccacaro T, Della C R 1991 ApJ 380 49
[8] [8]Xie G Z, Zhang X, Bai J M, Xie Z H 1998 ApJ 508 180
[9] [9] Kollgaard R I, Gabuzda D C, Feigelson E D1996 ApJ 460 174
[10] ] Laurent-Muehleisen S A, Kollgaard R I, Moellenbrock G A, Feigelson E D 1993 AJ 106 875
[11] ] Kollgaard R I, Palma C, Laurent-Muehleisen S A, Feigelson E D 1996 ApJ 465 115
[12] ]Perlman E S, Stocke J T, Wang Q D, Morris S L 1996 ApJ 456 451
[13] ]Ghisellini G, Maraschi L, Treves A, Tanzi E G 1986 ApJ 310 317
[14] ]Maraschi L, Ghisellini G, Tanzi E G, Treves A 1986 ApJ 310 325
[15] ] Kaspi S, Smith P S, Netzer H, Maoz D, Jannuzi B T, Giveon U 2000 ApJ 533 631
[16] ] Ferrarese L, Richard W, Peterson B M, Merritt D 2001 ApJ 555 79
[17] ]Gebhardt K, Bender R, Bower G, Dressler Alan, Faber S M, Filippenko A V, Green R, Grillmair C, Ho L C, Kormendy J 2000 ApJ 539 13
[18] ] Xie G Z, Liu B F, Liu F K, Lu R W, Li K H, Zhu Y Y 1991A&A 249 65
[19] ] Wu X B, Liu F K, Zhang T Z 2002 A&A 389 742
[20] ]Weiler K W, Johnston K J 1980 MNRAS 190 269
[21] [21 ]Fossati G, Maraschi L, Celotti A, Comastri A, Ghisellini G 1998 MNRAS 299 433
[22] ] Data from the University of Michigan Radio Astronomy Observatory
[23] [23 ]Ghisellini G, Haardt F, Fabian A C 1993 MNRAS 263 9
[24] ]Doxsey R, Bradt H, McClintock J, Petro L, Remillard R, Schwartz D, Wood K, Ricker G 1983 ApJ 264 43
[25] ]Biermann P, Duerbeck H, Eckart A, Fricke K, Johnston K J, Kuhr H, Liebert J, Pauliny Toth I I K, Schleicher H, Stockman H 1981 ApJ 247 53
[26] ]Cruz-Gonzalez I, Huchra J P 1984 AJ 89 441
[27] ]Worrall D M, Puschell J J, Bruhweiler F C, Sitko M L, Stein W A, Aller M F, Aller H D, Hodge P E, Rudy R J, Miller H R 1984 ApJ 284 512
[28] ]Worrall D M, Rodriguez-Espinosa J M, Wisniewski W Z, Miller H R, Bruhweiler F C, Aller M F, Aller H D 1986 ApJ 303 589
[29] ]Angel J R P, Stockman H S 1980 ARA&A 18 321
[30] ]Ledden J E, Odell S L 1985 ApJ 298 630
[31] ]Bregman J N, Glassgold A E, Huggins P J, Pollock J T, Pica A J, Smith A G, Webb J R, Ku W H M, Rudy R J, Levan P D 1982 ApJ 253 19
[32] ]Miley G, Neugebauer G, Soifer B T, Clegg P E, Harris S, Rowan-Robinson M, Young E 1984 ApJ 278 79
[33] ]Comastri A, Fossati G, Ghisellini G, Molendi S 1997 ApJ 480 534
[34] ] Mead A R G, Ballard K R, Brand P W J L, Hough J H, Brindle C, Bailey J A 1990 A&AS 83 183
[35] ]Takalo L O, Kidger M R, de Diego J A, Sillanpaa A, Nilsson K 1992 AJ 104 40
[36] ]Falomo R, Treves A, Chiappetti L, Maraschi L, Pian E, Tanzi E G 1993 ApJ 402 532
[37] ]Fan J H, Lin R G 1999 ApJS 121 131
[38] ]Massaro E, Nesci R, Perola G C, Lorenzetti D, Spinoglio L 1995A&A 299 339
[39] ]Fan J H, Feng X H, Su C Y 1999 PyunO 2 1
[40] ]Litchfield S J, Robson E I, Stevens J A 1994 MNRAS 270 341
[41] ]Kidger M R,de Diego J A 1992 A&AS 93 1
[42] ]Hec kman T M, Lebofsky M J, Rieke G H, van Breugel W 1983 ApJ 272 400
[43] ]Bersanelli M, Bouchet P, Falomo R, Tanzi E G 1992 AJ 104 28
[44] ]Bregman J N, Glassgold A E, Huggins P J, Neugebauer G, Soifer B T, Matthews K, Elias J H, Webb J R, Pollock J T, Leacock R J 1990 ApJ 352 574
[45] ]Brown L M J, Robson E I, Gear W K, Hughes D H, Griffin M J, Geldzahler B J, Schwartz P R, Smith M G, Smith A G, Shepherd D W 1989 ApJ 340 129
[46] ]Stickel M, Fried J W, Kuehr H 1988 A&A 191 16
[47] ]Falomo R, Scarpa R, Bersanelli M 1994 ApJS 93 125
[48] ]Madau P, Ghisellini G, Persic M 1987 MNRAS 224 257
[49] ]Fan J H, Lin R G 2000 ApJ 537 101
[50] ]Wills B J, Wills D, Evans N J II, Natta A, Thompson K L, Breger M, Sitko M L 1992 ApJ 400 96
[51] ] Mufson S L, Hutter D J, Hackney K R H, Hackney R L, Kondo Y, Mushotzky R F, Urry C M, Wisniewski W Z, Aller M F, Aller H D 1982 NASCP 2238 185
[52] ] Wills B J, Pollock J T, Aller H D, Aller M F, Balonek T J, Barvainis R E, Binzel R P, Chaffee F H, Dent W A, Douglas J N 1983 ApJ 274 62
[53] ]Ledden J E, Odell S L, Stein W A, Wisniewski W Z 1981 ApJ 243 47
[54] ]Webb J R, Smith A G, Leacock R J, Fitzgibbons G L, Gombola P P, Shepherd D W 1988 AJ 95 374
[55] ]Odell S L, Puschell J J, Stein W A, Owen F, Porcas R W, Mufson S, Moffett T J, Ulrich M H 1978 ApJ 224 22
[56] ]Westerlund B E, Wlerick G, Garnier R 1982 A&A 105 284
[57] ]Oke J B, Goodrich R W 1981 ApJ 243 445
[58] ]Wall J V, Peacock J A 1985 MNRAS 216 173
[59] ]Angione R J 1971 AJ 76 412
[60] ]Sambruna R M, Maraschi L, Urry C M 1996 ApJ 463 444
[61] ]Lamer G, Brunner H, Staubert R 1996 A&A 311 384
[62] ]Madejski G M, Schwartz D A 1983 ApJ 275 467
[63] ]Urry C M, Sambruna R M, Worrall D M, Kollgaard R I, Feigelson E D, Perlman E S, Stocke J T 1996 ApJ 463 424
[64] ]Treves A, Belloni T, Falomo R, Fink H, Maraschi L, Sambruna R M, Tagliaferri G, Zimmermann H U 1993 ApJ 406 447
[65] ]Bloom S D, Marscher A P, Moore E M, Gear W, Tersranta H, Valtaoja E, Aller H D, Aller M F 1999 ApJS 122 1
[66] ]Fichtel C E 1994 ApJS 90 917
[67] ]Sambruna R M 1997 ApJ 487 536
[68] ]Sambruna R M, Barr P, Giommi P, Maraschi L, Tagliaferri G, Treves A 1994 ApJ 434 468
[69] ]Giommi P, Ansari S G, Micol A 1995 A&AS 109 267
[70] ]Makino F 1989 ESASP 296 803
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