2006ApJ...645..264T

Query : 2006ApJ...645..264T

2006ApJ...645..264T - Astrophys. J., 645, 264-270 (2006/July-1)

Hubble Space Telescope identification of the optical counterparts of ultraluminous X-ray sources in M 51.

TERASHIMA Y., INOUE H. and WILSON A.S.

Abstract (from CDS):

We present the results of a search for optical identifications of ultraluminous X-ray sources (ULXs) in M51 by using mosaic images taken with the Hubble Space Telescope(HST) Advanced Camera for Surveys (ASC) in filters F435W (B), F555W (V), F814W (I), and F658N (Hα). Our sample, consisting of nine ULXs, is defined by analyzing the three Chandra observations of M51 performed in 2000 June, 2001 June, and 2003 August. We found that four ULXs have one or two candidates for counterparts, while two have multiple stars within their error circles. The other three have no candidate counterparts. Four ULXs are located near or in a star cluster, while others have no association with a cluster. These results indicate that the companion stars, environments, and origins of ULXs are probably heterogeneous.

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Journal keyword(s): Galaxies: Individual: Messier Number: M51 - X-Rays: Binaries - X-Rays: Galaxies - X-Rays: Stars

Nomenclature: Table 1: [TIW2006] ULX N (Nos 1-9).

Simbad objects: 16

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Number of rows : 16
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 NGC 2276 AG? 07 27 14.485 +85 45 16.20   12.3       ~ 375 0
2 M 82 AGN 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 5858 6
3 RX J123558+27577 UX? 12 35 58.56 +27 57 41.9           ~ 38 2
4 NGC 5204 LSB 13 29 36.508 +58 25 07.43   11.84   11.37   ~ 471 0
5 RX J132939+47126 HXB 13 29 39.48 +47 12 43.6   22.59 23.27   24.80 ~ 30 1
6 RX J132943+47115 UX? 13 29 43.31 +47 11 34.8   23.20 24.01   25.50 ~ 30 1
7 CXOU J132950.6+471155 Rad 13 29 50.68 +47 11 55.2           ~ 21 0
8 M 51 Sy2 13 29 52.698 +47 11 42.93   9.26 8.36 8.40   ~ 4329 4
9 CXOM51 J132953.3+471042 UX? 13 29 53.18 +47 10 42.4           ~ 22 0
10 RX J132954+47145 UX? 13 29 53.72 +47 14 35.7           ~ 22 1
11 CXOM51 J132958.4+471547 X 13 29 58.38 +47 15 47.4           ~ 5 0
12 NGC 5195 GiP 13 29 59.590 +47 15 58.06 10.76 10.45 9.55 9.31   ~ 778 3
13 RX J133001+47137 UX? 13 30 01.01 +47 13 43.9           ~ 86 0
14 RX J133006+47156 UX? 13 30 06.00 +47 15 42.3           ~ 18 0
15 RX J133007+47110 UX? 13 30 07.55 +47 11 06.1   25.17 25.49   26.04 ~ 68 1
16 M 101 GiP 14 03 12.583 +54 20 55.50   8.46 7.86 7.76   ~ 2914 2

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