2008A&A...478..395M


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.20CEST22:20:16

2008A&A...478..395M - Astronomy and Astrophysics, volume 478, 395-401 (2008/2-1)

X-ray spectral evolution of TeV BL Lacertae objects: eleven years of observations with BeppoSAX, XMM-Newton and Swift satellites.

MASSARO F., TRAMACERE A., CAVALIERE A., PERRI M. and GIOMMI P.

Abstract (from CDS):

Many of the extragalactic sources detected in γ rays at TeV energies are BL Lac objects. In particular, they belong to the subclass of ``high frequency peaked BL Lacs'' (HBLs), as their spectral energy distributions exhibit a first peak in the X-ray band. At a closer look, their X-ray spectra appear to be generally curved into a log-parabolic shape. In a previous investigation of Mrk 421, two correlations were found between the spectral parameters. One involves the height Sp increasing with the position Ep of the first peak; this was interpreted as a signature of synchrotron emission from relativistic electrons. The other involves the curvature parameter b decreasing as Ep increases; this points toward statistical/stochastic acceleration processes for the emitting electrons. We analyse X-ray spectra of several TeV HBLs to pinpoint their behaviours in the Ep-Sp and Ep-b planes and to compare them with Mrk 421. We perfom X-ray spectral analyses of a sample of 15 BL Lacs. We report the whole set of observations obtained with the BeppoSAX, XMM-Newton and Swift satellites between 29/06/96 and 07/04/07. We focus on five sources (PKS 0548-322, 1H 1426+418, Mrk 501, 1ES 1959+650, PKS 2155-304) whose X-ray observations warrant detailed searching of correlations or trends. Within our database, we find that four out of five sources, namely PKS 0548-322, 1H 1426+418, Mrk 501 and 1ES 1959+650, follow similar trends as Mrk 421 in the Ep-Sp plane, while PKS 2155-304 differs. As for the Ep-b plane, all TeV HBLs follow a similar behaviour. The trends exhibited by Mrk 421 appear to be shared by several TeV HBLs, such as to warrant discussing predictions from the X-ray spectral evolution to that of TeV emissions.

Abstract Copyright:

Journal keyword(s): galaxies: active - galaxies: BL Lacertae objects: general - X-rays: galaxies - radiation mechanisms: non-thermal

Errata: + corrigendum vol. 528, p. C1 (2011)

CDS comments: In abstract:1H 1426+418 is a misprint for 1H 1426+428,in Table A1 PKS 2354-315 not identified.

Simbad objects: 18

goto Full paper

goto View the reference in ADS

Number of rows : 18

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 B0229+200 BLL 02 32 48.6154943841 +20 17 17.493345304   18.0 18.00     ~ 273 3
2 QSO B0347-121 BLL 03 49 23.1861664460 -11 59 27.368085519   18.74 18.2 17.46   ~ 186 0
3 QSO B0548-322 BLL 05 50 40.5706739558 -32 16 16.488658537   16.07 15.5     ~ 375 1
4 6C 101157+494057 BLL 10 15 04.1393763275 +49 26 00.708524180   16.56 16.15 14.58   ~ 319 2
5 2A 1058-226 BLL 11 03 37.6150843895 -23 29 31.202114088   17.00 16.55 16.61   ~ 327 2
6 Mrk 421 BLL 11 04 27.3139210166 +38 12 31.798324828   13.50 12.90 8.31   ~ 2444 1
7 6C 113337+702604 BLL 11 36 26.4084430 +70 09 27.307497   15.16 14.49 10.51   ~ 329 1
8 QSO B1218+304 BLL 12 21 21.9427463316 +30 10 37.161573795   16.50 15.85 15.7   ~ 401 1
9 QSO B1426+428 BLL 14 28 32.6090831425 +42 40 21.050020627   16.95 16.45 14.4   ~ 465 2
10 QSO B1553+113 BLL 15 55 43.0439413597 +11 11 24.365587666 14.91 14.72 14.57 13.99   ~ 441 1
11 4C 39.49 BLL 16 53 52.21668494 +39 45 36.6089458 14.09 14.15 13.29 8.26   ~ 1961 2
12 QSO B1959+650 BLL 19 59 59.8525497024 +65 08 54.651170114     12.8 11.21   ~ 523 2
13 QSO B2005-489 BLL 20 09 25.3910622923 -48 49 53.722146927   15.75 12.81 11.41   ~ 522 2
14 QSO B2155-304 BLL 21 58 52.0651817803 -30 13 32.120657891   13.36 13.09 12.62   ~ 1598 1
15 NAME BL Lac BLL 22 02 43.2913773726 +42 16 39.978417860   15.66 14.72     ~ 2040 1
16 QSO B2344+514 BLL 23 47 04.8376303689 +51 42 17.875387216     15.50 10.7   ~ 402 0
17 QSO B2344-514 QSO 23 47 19.8635686680 -51 10 36.065159085   20.1   21.31   ~ 22 1
18 QSO B2356-309 BLL 23 59 07.9032684889 -30 37 40.667900741   18.414 16.44 16.795   ~ 256 1

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2008A&A...478..395M and select 'bookmark this link' or equivalent in the popup menu


2021.04.20-22:20:16

© Université de Strasbourg/CNRS

    • Contact