2001A&A...371..512C


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.19CEST07:38:27

2001A&A...371..512C - Astronomy and Astrophysics, volume 371, 512-526 (2001/5-4)

Extreme synchrotron BL Lac objects. Stretching the blazar sequence.

COSTAMANTE L., GHISELLINI G., GIOMMI P., TAGLIAFERRI G., CELOTTI A., CHIABERGE M., FOSSATI G., MARASCHI L., TAVECCHIO F., TREVES A. and WOLTER A.

Abstract (from CDS):

We performed an observational program with the X-ray satellite BeppoSAX, to study objects with extreme synchrotron peak frequencies (νpeak>1keV). Of the seven sources observed, five revealed or confirmed their extreme nature. Four showed peak frequencies in the range 1-5keV, while one (1ES 1426+428) displayed a flat power law spectrum (αx=0.92±0.04) which locates its synchrotron peak at or above 100keV. This is the third source of this type ever found, after Mkn 501 and 1ES 2344+514. In the context of the whole blazar class, the broad band properties of these objects confirm the scenario of a synchrotron peak smoothly spanning the IR - X-ray range, which explains the multi-frequency properties of the blazar class. Our data also confirm the large νpeak variability which seems to characterize this class of sources, compared with lower νpeak objects. Given the high synchrotron peak energies, which flag the presence of high energy electrons, these extreme BL Lacs are also good candidates for TeV emission, and therefore good probes of the IR background.

Abstract Copyright:

Journal keyword(s): BL Lacertae objects: individual: 1ES 0033+595, 1ES 0120+340, PKS 0548-322, GB 1114+203, 1ES 1218+304, 1ES 1426+428, H 2356-309 - X-rays: general - TeV: general

Simbad objects: 9

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Number of rows : 9

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 QSO B0033+595 BLL 00 35 52.554 +59 50 04.19     19.5 17.2   ~ 134 2
2 2E 369 BLL 01 23 08.648 +34 20 48.56     15.2 16.8   ~ 87 0
3 QSO B0548-322 BLL 05 50 40.5706739558 -32 16 16.488658537   16.07 15.5     ~ 358 1
4 87GB 111429.0+203022 BLL 11 17 06.2518630666 +20 14 07.383643748     15.20     ~ 95 1
5 QSO B1218+304 BLL 12 21 21.9427463316 +30 10 37.161573795   16.50 15.85 15.7   ~ 377 1
6 QSO B1426+428 BLL 14 28 32.6090831425 +42 40 21.050020627   16.95 16.45 14.4   ~ 447 2
7 4C 39.49 BLL 16 53 52.21668494 +39 45 36.6089458 14.09 14.15 13.29 8.26   ~ 1876 2
8 QSO B2344+514 BLL 23 47 04.8376303689 +51 42 17.875387216     15.50 10.7   ~ 375 0
9 QSO B2356-309 BLL 23 59 07.9032684889 -30 37 40.667900741   18.414 16.44 16.795   ~ 241 1

    Equat.    Gal    SGal    Ecl

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2019.10.19-07:38:27

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