2005ApJ...625..727P


Query : 2005ApJ...625..727P

2005ApJ...625..727P - Astrophys. J., 625, 727-740 (2005/June-1)

Intrinsic curvature in the X-ray spectra of BL Lacertae objects.

PERLMAN E.S., MADEJSKI G., GEORGANOPOULOS M., ANDERSSON K., DAUGHERTY T., KROLIK J.H., RECTOR T., STOCKE J.T., KORATKAR A., WAGNER S., ALLER M., ALLER H. and ALLEN M.G.

Abstract (from CDS):

We report results from XMM-Newton observations of 13 X-ray bright BL Lacertae objects, selected from the Einstein Slew Survey sample (SSS). The survey was designed to look for evidence of departures of the X-ray spectra from a simple power-law shape (i.e., curvature and/or line features) and to find objects worthy of deeper study. Our data are generally well fit by power-law models, with three cases having hard (Γ<2; dN/dE∝E–Γ) spectra that indicate synchrotron peaks at E≳5 keV. Previous data had suggested a presence of absorption features in the X-ray spectra of some BL Lac objects. In contrast, none of these spectra show convincing examples of line features in either absorption or emission, suggesting that such features are rare among BL Lac objects, or, more likely, are artifacts caused by instrumental effects. We find significant evidence for intrinsic curvature [steepening by dΓ/d(logE)=0.4±0.15] in 14 of the 17 X-ray spectra. This cannot be explained satisfactorily via excess absorption, since the curvature is essentially constant from 0.5-6 keV, an observation that is inconsistent with the modest amounts of absorption that would be required. We use the XMM-Newton Optical Monitor data with concurrent radio monitoring to derive broadband spectral energy distributions and peak frequency estimates. From these, we examine models of synchrotron emission and model the spectral curvature we see as the result of episodic particle acceleration.

Abstract Copyright:

Journal keyword(s): Galaxies: BL Lacertae Objects: General - Galaxies: BL Lacertae Objects: Individual: Alphanumeric: 1ES 0033+595 - Galaxies: BL Lacertae Objects: Individual: Alphanumeric: 1ES 0120+340 - Galaxies: BL Lacertae Objects: Individual: Alphanumeric: 1ES 0145+138 - Galaxies: BL Lacertae Objects: Individual: Alphanumeric: 1ES 0323+022 - Galaxies: BL Lacertae Objects: Individual: Alphanumeric: 1ES 0347-121 - Galaxies: BL Lacertae Objects: Individual: Alphanumeric: 1ES 0414+009 - Galaxies: BL Lacertae Objects: Individual: Alphanumeric: 1ES 0647+250 - Galaxies: BL Lacertae Objects: Individual: Alphanumeric: 1ES 1028+511 - Galaxies: BL Lacertae Objects: Individual: Alphanumeric: 1ES 1101-232 - Galaxies: BL Lacertae Objects: Individual: Alphanumeric: 1ES 1255+244 - Galaxies: BL Lacertae Objects: Individual: Alphanumeric: 1ES 1553+113 - Galaxies: BL Lacertae Objects: Individual: Alphanumeric: 1ES 1959+650 - Galaxies: BL Lacertae Objects: Individual: Name: Markarian 180 - Galaxies: Active - Radiation Mechanisms: Nonthermal - X-Rays: Galaxies

Simbad objects: 20

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Number of rows : 20
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   ~ 145 2
2 4FGL J0123.1+3421 BLL 01 23 08.6 +34 20 48     15.2 16.8   ~ 102 1
3 QSO B0145+138 BLL 01 48 29.7009147811 +14 02 17.852183006     17.90 16.7   ~ 45 0
4 QSO B0323+022 BLL 03 26 13.9474696478 +02 25 14.675022985   17.05 16.55 15.3   ~ 228 1
5 QSO B0347-121 BLL 03 49 23.1861664460 -11 59 27.368085519   18.74 18.2 17.46   ~ 192 0
6 QSO B0414+009 BLL 04 16 52.4945787354 +01 05 23.896410061   16.86 16.38 16   ~ 254 0
7 QSO B0548-322 BLL 05 50 40.5706739558 -32 16 16.488658537   16.07 15.5     ~ 381 1
8 QSO B0647+250 BLL 06 50 46.4902391458 +25 02 59.623980609 16.17 15.97 15.79 16.3   ~ 126 2
9 QSO B1028+511 BLL 10 31 18.5251431722 +50 53 35.821637845   17.25 16.98 16.3   ~ 163 1
10 2A 1058-226 BLL 11 03 37.6150843895 -23 29 31.202114088   17.00 16.55 16.61   ~ 333 2
11 Mrk 421 BLL 11 04 27.3139210166 +38 12 31.798324828   13.50 12.90 8.31   ~ 2469 1
12 6C 113337+702604 BLL 11 36 26.4084430 +70 09 27.307497   15.16 14.49 10.51   ~ 335 1
13 QSO B1218+304 BLL 12 21 21.9427463316 +30 10 37.161573795   16.50 15.85 15.7   ~ 408 1
14 M 87 BiC 12 30 49.42338230 +12 23 28.0438581 10.16 9.59 8.63   7.49 ~ 6477 3
15 QSO B1255+244 BLL 12 57 31.9330234281 +24 12 40.168674935     15.4 15.7   ~ 74 0
16 QSO B1426+428 BLL 14 28 32.6090831425 +42 40 21.050020627   16.95 16.45 14.4   ~ 471 2
17 QSO B1553+113 BLL 15 55 43.0439413597 +11 11 24.365587666 14.91 14.72 14.57 13.99   ~ 451 1
18 4C 39.49 BLL 16 53 52.21668494 +39 45 36.6089458 14.09 14.15 13.29 8.26   ~ 1987 2
19 QSO B1959+650 BLL 19 59 59.8525497024 +65 08 54.651170114     12.8 11.21   ~ 536 2
20 QSO B2155-304 BLL 21 58 52.0651817803 -30 13 32.120657891   13.36 13.09 12.62   ~ 1618 1

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2021.09.28-06:43:56

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