2006ApJ...637..682W

Query : 2006ApJ...637..682W

2006ApJ...637..682W - Astrophys. J., 637, 682-692 (2006/February-1)

The first Chandra field.

WEISSKOPF M.C., ALDCROFT T.L., CAMERON R.A., GANDHI P., FOELLMI C., ELSNER R.F., PATEL S.K., WU K. and O'DELL S.L.

Abstract (from CDS):

Before the official first-light images, the Chandra X-Ray Observatory obtained an X-ray image of the field to which its focal plane was first exposed. We describe this historic observation and report our study of the first Chandra field. Chandra's Advanced CCD Imaging Spectrometer (ACIS) detected 15 X-ray sources, the brightest being dubbed Leon X-1 to honor the Chandra telescope scientist Leon Van Speybroeck. Based on our analysis of the X-ray data and spectroscopy at the European Southern Observatory (ESO; La Silla, Chile), we find that Leon X-1 is a type-1 (unobscured) active galactic nucleus (AGN) at redshift z=0.3207. Leon X-1 exhibits strong Fe II emission and a broad-line Balmer decrement that is unusually flat for an AGN. Within the context of the eigenvector-1 correlation space, these properties suggest that Leon X-1 may be a massive (≥109 M☉) black hole, accreting at a rate approaching its Eddington limit.

Abstract Copyright: ∼

Journal keyword(s): Galaxies: Active - History and Philosophy of Astronomy - X-Rays: General

Nomenclature: Table 1, col(2): [WAC2006] SN-NN (Nos S3-1 to S3-10, S2-1), [WAC2006 IA-N (Nos IA-1 to IA-4).

Simbad objects: 23

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Number of rows : 23
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 2MASS J00454722+0410233 Sy1 00 45 47.2231233240 +04 10 23.386759392   15.88 16.00     ~ 163 0
2 Mrk 1502 Sy1 00 53 34.9331107632 +12 41 35.929269132   14.41 14.03     ~ 1242 1
3 CXOU J051903.8-604401 X 05 19 03.8 -60 44 01           ~ 1 0
4 CXOU J051907.1-604500 X 05 19 07.1 -60 45 00           ~ 1 0
5 CXOU J051912.0-604359 X 05 19 12.0 -60 43 59           ~ 1 0
6 [WAC2006] S2-1 X 05 19 17.9218933104 -60 33 16.046484084           ~ 1 0
7 CXOU J051932.6-604619 X 05 19 32.6 -60 46 19           ~ 1 0
8 NAME Leon X-1 Sy1 05 19 36.3304043376 -60 48 03.982386384   9.0   17.63   ~ 5 0
9 [WAC2006] S3-6 X 05 19 43.2276447000 -60 41 41.857065024           ~ 1 0
10 CXOU J051958.2-604533 X 05 19 58.2 -60 45 33           ~ 1 0
11 CXOU J051959.9-604759 X 05 19 59.9 -60 47 59           ~ 1 0
12 2MASS J05200361-6043162 AGN 05 20 03.6639336936 -60 43 16.189717476           ~ 1 0
13 HD 35402 * 05 20 28.2030783033 -60 46 47.447665050   7.18 7.09     A3V 20 0
14 CXOU J052031.5-604002 X 05 20 31.5 -60 40 02           ~ 1 0
15 CXOU J052116.9-604430 X 05 21 16.9 -60 44 30           ~ 1 0
16 [WAC2006] IA-3 X 05 21 16.9573688064 -60 40 59.003441508           ~ 1 0
17 CXOU J052144.5-602918 X 05 21 44.5 -60 29 18           ~ 1 0
18 1RXS J052145.5-602906 X 05 21 45.5 -60 29 06           ~ 1 0
19 QSO J0635-7516 Bla 06 35 46.5079301472 -75 16 16.816418256   15.96 15.75 15.82   ~ 625 1
20 IRAS 07598+6508 Sy1 08 04 30.4643108040 +64 59 52.789588188   14.3 15.5     ~ 242 0
21 Z 294-4 Sy1 12 56 14.2341182928 +56 52 25.238373852   14.68 13.84     ~ 2096 3
22 Mrk 662 Sy1 13 54 06.4281510312 +23 25 49.346507964   16.06 15.37     ~ 115 0
23 NAME Cas A SNR 23 23 26.0 +58 48 41     14.30     ~ 3033 1

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