2002A&A...386..833G


C.D.S. - SIMBAD4 rel 1.7 - 2020.12.03CET19:43:29

2002A&A...386..833G - Astronomy and Astrophysics, volume 386, 833-842 (2002/5-2)

Low power BL Lacertae objects and the blazar sequence. Clues on the particle acceleration process.

GHISELLINI G., CELOTTI A. and COSTAMANTE L.

Abstract (from CDS):

The spectral properties of blazars seem to follow a phenomenological sequence according to the source luminosity. By inferring the source physical parameters through (necessarily) modeling of the blazar spectra, we have previously proposed that the sequence arises because the particles responsible for most of the emission suffer increasing radiative losses as the luminosity increases. Here we extend those results by considering the widest possible range of blazar spectral properties. We find a new important ingredient for shaping the spectra of the lowest power objects, namely the role of a finite timescale for the injection of relativistic particles. Only high energy particles radiatively cool over such a timescale leading to a break in the particle distribution: particles with this break energy are those emitting most of the power, and this gives rise to a link between blazar spectra and total energy density inside the source, which controls the cooling timescale. The emerging picture requires two phases for the particle acceleration: a first pre-heating phase in which particles reach a characteristic energy as the result of balancing heating and radiative cooling, and a more rapid acceleration phase which further accelerate these particles to form a power law distribution. While in agreement with standard shock theory, this scenario also agrees with the idea that the luminosity of blazars is produced through internal shocks, which naturally lead to shocks lasting for a finite time.

Abstract Copyright:

Journal keyword(s): acceleration of particles - radiation mechanisms: general - BL Lac objects: general

Simbad objects: 15

goto Full paper

goto View the reference in ADS

Number of rows : 15

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 QSO B0033+595 BLL 00 35 52.554 +59 50 04.19     19.5 17.2   ~ 138 2
2 3FHL J0123.0+3422 BLL 01 23 08.648 +34 20 48.56     15.2 16.8   ~ 90 0
3 QSO J0525-3343 QSO 05 25 06.1754530726 -33 43 05.643316632     18.50 18.5   ~ 49 1
4 QSO B0548-322 BLL 05 50 40.5706739558 -32 16 16.488658537   16.07 15.5     ~ 370 1
5 9Y-MST J1103-2329 BLL 11 03 37.6150843895 -23 29 31.202114088   17.00 16.55 16.61   ~ 322 2
6 Mrk 421 BLL 11 04 27.3139210166 +38 12 31.798324828   13.50 12.90 8.31   ~ 2410 1
7 9Y-MST J1117+2013 BLL 11 17 06.2518630666 +20 14 07.383643748     15.20     ~ 100 1
8 QSO B1218+304 BLL 12 21 21.9427463316 +30 10 37.161573795   16.50 15.85 15.7   ~ 392 1
9 QSO B1426+428 BLL 14 28 32.6090831425 +42 40 21.050020627   16.95 16.45 14.4   ~ 460 2
10 7C 142826.80+421756.00 QSO 14 30 23.74163330 +42 04 36.4911889   24.43 22.04 20.2   ~ 120 1
11 QSO B1508+572 QSO 15 10 02.92236464 +57 02 43.3759071   22.73 21.38 19.23   ~ 160 0
12 4C 39.49 BLL 16 53 52.21668494 +39 45 36.6089458 14.09 14.15 13.29 8.26   ~ 1938 2
13 QSO B2005-489 BLL 20 09 25.3910622923 -48 49 53.722146927   15.75 12.81 11.41   ~ 516 2
14 QSO B2344+514 BLL 23 47 04.8376303689 +51 42 17.875387216     15.50 10.7   ~ 394 0
15 QSO B2356-309 BLL 23 59 07.9032684889 -30 37 40.667900741   18.414 16.44 16.795   ~ 251 1

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2002A&A...386..833G and select 'bookmark this link' or equivalent in the popup menu


2020.12.03-19:43:29

© Université de Strasbourg/CNRS

    • Contact