1998A&A...334...39S


C.D.S. - SIMBAD4 rel 1.7 - 2021.05.11CEST10:36:14

1998A&A...334...39S - Astronomy and Astrophysics, volume 334, 39-44 (1998/6-1)

Do the central engines of quasars evolve by accretion?

SRIANAND R. and GOPAL-KRISHNA

Abstract (from CDS):

According to a currently popular paradigm, nuclear activity in quasars is sustained via accretion of material onto super-massive black holes located at the quasar nuclei. A useful tracer of the gravitational field in the vicinity of such central black holes is available in the form of extremely dense gas clouds within the broad emission-line region (BLR) on the scale of ∼1 parsec. Likewise, the radio sizes of the lobe-dominated radio sources are believed to provide a useful statistical indicator of their ages. Using two homogeneously observed (and processed) sets of lobe-dominated radio-loud quasars, taken from literature, we show that a positive correlation exists between the radio sizes of the quasars and the widths of their broad Hβ emission lines, and this correlation is found to be significantly stronger than the other well known correlations involving radio size. This statistical correlation is shown to be consistent with the largest (and, hence, very possibly the oldest) radio sources harboring typically an order-of-magnitude more massive central engines, as compared to the physically smaller and, hence, probably much younger radio sources. This inference is basically in accord with the "accreting central engine" picture for the radio-loud quasars.

Abstract Copyright:

Journal keyword(s): line: profiles - galaxies: active - quasars: emission lines - quasars: general - radio continuum: galaxies

Simbad objects: 42

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Number of rows : 42

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 2E 12 Sy1 00 05 59.2379634379 +16 09 49.023089304   16.51 16.40     ~ 269 1
2 QSO B0042+101 BLL 00 44 58.7277972178 +10 26 53.127718594   17.4 18.00 18.1   ~ 34 1
3 2E 177 Sy1 00 47 05.9186400186 +03 19 54.785770057   16.2 16.37     ~ 140 1
4 4C 29.02 Sy1 01 13 24.2415955715 +29 58 16.018087669     17.00     ~ 84 1
5 3C 37 Sy1 01 18 18.4869 +02 58 05.733     17.5     ~ 121 0
6 3C 39 Sy1 01 21 01.2 +03 44 14   18.3 18.09 18.7   ~ 86 1
7 2E 437 Sy1 01 36 24.4206016519 +20 57 27.523115842   18.15 18.10     ~ 347 2
8 3C 48 QSO 01 37 41.2995845985 +33 09 35.079126038   16.62 16.20     ~ 2583 2
9 PKS 0405-123 Sy1 04 07 48.4309594137 -12 11 36.660481492   15.09 14.86 14.7   ~ 477 1
10 2E 962 Sy1 04 17 16.7842860907 -05 53 45.608565853   16.24 15.94 15.7   ~ 165 1
11 ICRF J052109.8+163822 Sy1 05 21 09.88592749 +16 38 22.0517668   19.37 18.84 18.480   ~ 770 1
12 ICRF J054236.1+495107 Sy1 05 42 36.13789843 +49 51 07.2337251   18.45 17.80 17.210   ~ 1313 1
13 2E 1790 Sy1 07 13 02.4221654766 +11 46 16.271366187   17.06 16.60     ~ 255 1
14 7C 080009.19+604841.00 Sy1 08 04 24.9923772058 +60 40 08.075021547     18.8     ~ 31 1
15 2E 2028 Sy1 08 39 50.5830250022 -12 14 34.328911501   15.78 15.76     ~ 227 0
16 ICRF J084047.5+131223 Sy1 08 40 47.58841798 +13 12 23.5641152   18.58 18.15 17.622   ~ 394 1
17 LB 9308 Sy1 09 06 31.8733814507 +16 46 11.791988809   18.48 18.27     ~ 285 3
18 4C 09.35 Sy1 09 54 56.8951481898 +09 29 55.803746878   18.57 18.25     ~ 73 2
19 Ton 469 Sy1 09 58 20.9495949602 +32 24 02.209578357   15.88 15.78 15.51   ~ 405 1
20 4C 13.41 Sy1 10 07 26.0965727406 +12 48 56.188170981   15.81 15.68     ~ 381 2
21 7C 100725.89+414711.00 Sy1 10 10 27.5276512902 +41 32 39.052946433   16.72 16.67     ~ 171 1
22 2E 2340 Sy1 10 51 29.9161805242 -09 18 10.190625278   16.85 16.79 16.5   ~ 180 1
23 2E 2389 Sy1 11 04 13.8613944317 +76 58 58.192391742   15.70 15.72 15.40   ~ 515 1
24 QSO B1103-006 Sy1 11 06 31.7741855481 -00 52 52.381519650   16.39 16.46     ~ 208 1
25 3C 254 QSO 11 14 38.7251514286 +40 37 20.333882148   17.62 17.42     ~ 305 2
26 2E 2503 Sy1 11 39 57.0253396181 +65 47 49.482487703   16.50 16.32     ~ 493 1
27 Ton 616 Sy1 12 25 39.5496462916 +24 58 36.382561960   17.35 17.12     ~ 131 1
28 2E 2879 Sy1 12 52 26.3557117356 +56 34 19.567896586   18.42 18.11 17.660   ~ 275 2
29 3C 281 Sy1 13 07 53.9294798389 +06 42 13.881183584   17.15 17.02     ~ 131 2
30 2MASS J13533592+2631475 Sy1 13 53 35.9252576560 +26 31 47.507782451   17.15 17.18     ~ 56 1
31 Ton 202 Sy1 14 27 35.6081505943 +26 32 14.540877233   15.96 16.00     ~ 278 1
32 ICRF J145907.5+714019 Sy1 14 59 07.5831170610 +71 40 19.867413302   17.24 16.78 17.2   ~ 460 1
33 4C 37.43 Sy1 15 14 43.0682940988 +36 50 50.355363752   17.11 17.01 15.83   ~ 379 1
34 2MASX J15474353+2052167 Sy1 15 47 43.5377678391 +20 52 16.613895999   16.80 16.69 15.70   ~ 456 0
35 2E 3648 Sy1 16 20 21.8184966430 +17 36 23.952696503   16.53 16.41 20.5   ~ 392 2
36 4C 23.43 Sy1 16 24 39.0836869355 +23 45 12.221830474   17.91 17.47     ~ 320 1
37 2A 1705+609 Sy1 17 04 41.3742389551 +60 44 30.522600868   15.65 15.40 15.30   ~ 728 1
38 2E 3940 Sy1 17 42 51.5936256455 +61 45 54.563739828   17.88 17.74     ~ 29 1
39 ICRF J182931.7+484446 Sy1 18 29 31.7812801678 +48 44 46.158815781   17.05 16.81 16.860   ~ 642 1
40 2E 2135.0-1446 Sy1 21 37 45.1960175219 -14 32 55.696077090 15.41 15.63 15.53 15.0   ~ 354 0
41 4C 11.72 BLL 22 54 10.4213843099 +11 36 38.745749268   16.02 15.82     ~ 323 1
42 4C 09.72 BLL 23 11 17.7543884785 +10 08 15.754791578   16.15 16.00     ~ 183 1

    Equat.    Gal    SGal    Ecl

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2021.05.11-10:36:14

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