2009A&A...501....1C


C.D.S. - SIMBAD4 rel 1.7 - 2020.08.03CEST21:09:54

2009A&A...501....1C - Astronomy and Astrophysics, volume 501, 1-13 (2009/7-1)

Detailed radio to soft γ-ray studies of the 2005 outburst of the new X-ray transient XTE J1818-245.

CADOLLE BEL M., PRAT L., RODRIGUEZ J., RIBO M., BARRAGAN L., D'AVANZO P., HANNIKAINEN D.C., KUULKERS E., CAMPANA S., MOLDON J., CHATY S., ZURITA-HERAS J., GOLDWURM A. and GOLDONI P.

Abstract (from CDS):

XTE J1818-245 is an X-ray nova that experienced an outburst in 2005, as first seen by the RXTE satellite. The source was observed simultaneously at various wavelengths up to soft γ-rays with the INTEGRAL satellite, from 2005 February to September, during our INTEGRAL Target of Opportunity program dedicated to new X-ray novae and during Galactic Bulge observations. X-ray novae are extreme systems that often harbor a black hole, and are known to emit throughout the electromagnetic spectrum when in outburst. The goals of our programme are to understand the physical processes close to the black hole and to study the possible connection with the jets that are observed in the radio. We analysed radio, (N)IR, optical, X-ray and soft γ-ray observations. We constructed simultaneous broad-band X-ray spectra covering a major part of the outburst, which we fitted with physical models. Analyzing both the light curves in various energy ranges and the hardness-intensity diagram enabled us to study the long-term behaviour of the source. Spectral parameters were typical of the soft intermediate states and the high soft states of a black hole candidate. The source showed relatively small spectral variations in X-rays with considerable flux variation in radio. Spectral studies showed that the accretion disc cooled down from 0.64 to 0.27keV in ∼100days and that the total flux decreased while the relative flux of the hot medium increased. Radio emission was detected several times, and, interestingly, five days after entering the HSS. Modeling the spectral energy distribution from the radio to the soft γ-rays reveals that the radio flares arise from several ejection events. XTE J1818-245 probably belongs to the class of low-mass X-ray binaries and is likely a black hole candidate transient source that might be closer than the Galactic Bulge. The results from the data analysis trace the physical changes that took place in the system (disc, jet/corona) at a maximum bolometric luminosity of 0.4-0.9x1038erg/s (assuming a distance between 2.8-4.3kpc) and they are discussed within the context of disc and jet models.

Abstract Copyright:

Journal keyword(s): black hole physics - stars: individual: XTE J1818-245 - gamma rays: observations - X-rays: binaries - infrared: general - radio continuum: general

Simbad objects: 24

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Number of rows : 24

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 1A 0620-00 HXB 06 22 44.5420315454 -00 20 44.289428950 10.60 11.40 11.2     K3V-K7V 1042 0
2 V* KV UMa HXB 11 18 10.7922353051 +48 02 12.319175505     12.25     K5V-M1V 724 0
3 3C 286 Sy1 13 31 08.2885060664 +30 30 32.960825108   17.51 17.25     ~ 3733 1
4 V* IL Lup HXB 15 47 08.2766679321 -47 40 10.284971214           ~ 415 1
5 V* V381 Nor HXB 15 50 58.6520652623 -56 28 35.309070422   17.95 16.6     K3III 1027 0
6 [GHJ2008] 3 HXB 16 50 00.980 -49 57 43.60           K4V 347 0
7 V* V1033 Sco HXB 16 54 00.137 -39 50 44.90   15.20 14.2 16.14   F5IV 1705 1
8 V* V821 Ara HXB 17 02 49.3810714542 -48 47 23.163091737 16.20 16.30 15.5     ~ 1769 0
9 V* V1228 Sco LXB 17 19 58.990 -31 45 01.11           ~ 108 1
10 QSO B1730-130 QSO 17 33 02.70578476 -13 04 49.5481484   18 18.5 18.78 17.39 ~ 984 1
11 NAME XTE J17464-3213 LXB 17 46 15.59637 -32 14 00.8600           ~ 602 0
12 PMN J1751-2524 Rad 17 51 51.26306 -25 24 00.0607           ~ 69 0
13 2MAXI J1753-013 LXB 17 53 28.2897263704 -01 27 06.256526637 15.30 16.73 16.46 16.15 15.64 ~ 282 0
14 4U 1758-25 LXB 18 01 09.7308941918 -25 04 44.128444504           ~ 614 1
15 2XMM J180112.4-254436 LXB 18 01 12.40 -25 44 36.1           ~ 362 1
16 NVSS J181106-205503 Rad 18 11 06.79427 -20 55 03.2781           ~ 13 1
17 [KRL2007b] 312 LXB 18 17 43.537 -33 01 07.80           ~ 138 0
18 XTE J1818-245 LXB 18 18 24.430 -24 32 17.96           ~ 34 0
19 QSO J1820-2528 QSO 18 20 57.84869182 -25 28 12.5836842   18.56       ~ 79 0
20 V* V4634 Sgr LXB 18 29 28.2 -23 47 49 18.90 19.40 19     ~ 288 0
21 V* V406 Vul HXB 18 58 41.580 +22 39 29.40 15.00 15.65 15.31     G5V-K0V 318 0
22 Granat 1915+105 LXB 19 15 11.54938 +10 56 44.7585           ~ 2289 0
23 QSO B1958-179 QSO 20 00 57.09044485 -17 48 57.6725440   18.02 17.46 15.33   ~ 221 1
24 NAME Galactic Bulge reg ~ ~           ~ 3408 0

    Equat.    Gal    SGal    Ecl

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2020.08.03-21:09:54

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