2011AJ....141..176A


Query : 2011AJ....141..176A

2011AJ....141..176A - Astron. J., 141, 176 (2011/June-0)

No confirmed new isolated neutron stars in the SDSS data release 4.

AGUEROS M.A., POSSELT B., ANDERSON S.F., ROSENFIELD P., HABERL F., HOMER L., MARGON B., NEWSOM E.R. and VOGES W.

Abstract (from CDS):

We report on follow-up observations of candidate X-ray-bright, radio-quiet isolated neutron stars (INSs) identified from correlations of the ROSAT All-Sky Survey (RASS) and the Sloan Digital Sky Survey (SDSS) Data Release 4 in Agüeros et al. We obtained Chandra X-ray Observatory exposures for 13 candidates in order to pinpoint the source of X-ray emission in optically blank RASS error circles. These observations eliminated 12 targets as good INS candidates. We discuss subsequent observations of the remaining candidate with XMM-Newton, the Gemini North Observatory, and the Apache Point Observatory. We identify this object as a likely extragalactic source with an unusually high log (f X/fopt) ∼ 2.4. We also use an updated version of the population synthesis models of Popov et al. to estimate the number of RASS-detected INSs in the SDSS Data Release 7 footprint. We find that these models predict ∼3-4 INSs in the 11,000 deg2 imaged by SDSS, which is consistent with the number of known INSs that fall within the survey footprint. In addition, our analysis of the four new INS candidates identified in the SDSS footprint implies that they are unlikely to be confirmed as INSs; together, these results suggest that new INSs are not likely to be found from further correlations of the RASS and SDSS.

Abstract Copyright:

Journal keyword(s): stars: neutron

Simbad objects: 40

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Number of rows : 40
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 [VV2006] J003413.1-010026 QSO 00 34 13.0453342848 -01 00 26.962936992   17.37 17.11     ~ 31 0
2 1RXS J003413.7-010134 X 00 34 13.7 -01 01 34           ~ 2 0
3 1RXS J013630.4+004226 X 01 36 30.4 +00 42 26           ~ 2 0
4 RX J0720.4-3125 N* 07 20 24.961 -31 25 50.21   26.1   27.0   ~ 292 0
5 2MASS J09231420+2754283 QSO 09 23 14.2126762464 +27 54 28.346489172   18.1 18.19 18.4   ~ 23 0
6 SDSS J102700.55+364016.0 QSO 10 27 00.5567347440 +36 40 16.140630180   20.95 20.56     ~ 18 0
7 SDSS J103413.68+435345.5 QSO 10 34 13.6993797312 +43 53 45.627734112           ~ 3 0
8 1RXS J103415.1+435402 X 10 34 15.1 +43 54 02           ~ 2 0
9 CXOGNC J104608.71-594306.4 N*? 10 46 08.719 -59 43 06.48           ~ 18 0
10 1RXS J110219.6+022836 X 11 02 19.6 +02 28 36           ~ 2 0
11 1RXS J122344.6+373015 X 12 23 44.6 +37 30 15           ~ 2 0
12 SDSS J122344.96+373019.3 G 12 23 44.965 +37 30 19.34           ~ 1 0
13 SDSS J130205.19+155134.4 QSO 13 02 05.1955243728 +15 51 34.429442364   21.53 21.16     ~ 9 0
14 RX J1305.7+6412 * 13 05 47.2 +64 12 52           ~ 7 0
15 RX J1308.8+2127 N*? 13 08 48.7 +21 27 08   28.6 28.6     ~ 150 1
16 1RXS J131400.1+072312 X 13 14 00.1 +07 23 12           ~ 2 0
17 1RXS J140654.5+525316 X 14 06 54.5 +52 53 16           ~ 2 0
18 SDSS J140654.82+525310.7 * 14 06 54.821 +52 53 10.76           ~ 1 0
19 1RXS J141428.5+601707 X 14 14 28.5 +60 17 07           ~ 2 0
20 1RXS J141944.5+113222 X 14 19 44.5 +11 32 22           ~ 2 0
21 1RXS J141949.0+113619 * 14 19 49.0 +11 36 19           ~ 3 0
22 1RXS J142423.3-020201 X 14 24 23.3 -02 02 01           ~ 2 0
23 RX J1443.9+4431 X 14 43 59.6 +44 31 24           ~ 5 0
24 SDSS J144400.25+443117.9 * 14 44 00.255 +44 31 17.94           ~ 1 0
25 SDSS J144400.60+443119.5 G 14 44 00.607 +44 31 19.52           ~ 1 0
26 SDSS J151854.72+355538.4 QSO 15 18 54.7239501192 +35 55 38.375152212           ~ 3 0
27 1RXS J151855.1+355543 X 15 18 55.1 +35 55 43           ~ 2 0
28 1RXS J155705.0+383509 X 15 57 05.0 +38 35 09           ~ 2 0
29 RX J1605.3+3249 N*? 16 05 18.9 +32 49 07     26.8     ~ 95 1
30 1RXS J162526.9+455750 X 16 25 26.9 +45 57 50           ~ 1 0
31 RX J1856.6-3754 Psr 18 56 35.11 -37 54 30.5     25.7     ~ 413 0
32 1RXS J205334.0-063617 X 20 53 34.0 -06 36 17           ~ 1 0
33 SDSS J212658.27+101105.2 * 21 26 58.2712890648 +10 11 05.184919680           ~ 1 0
34 SDSS J212700.20+101119.1 * 21 27 00.203 +10 11 19.04           ~ 1 0
35 1RXS J212700.3+101108 X 21 27 00.3 +10 11 08           ~ 3 0
36 SWIFT J212700.3+101122 X 21 27 00.30 +10 11 22.2           ~ 1 0
37 RX J2143.0+0654 N*? 21 43 03.8 +06 54 20           ~ 74 0
38 SDSS J230332.79+152015.3 G 23 03 32.7922628496 +15 20 15.387594216           ~ 1 0
39 RX J2303.5+1520 X 23 03 34.0 +15 20 20           ~ 4 0
40 NAME Magnificent Seven ? ~ ~           ~ 65 1

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2022.09.26-08:48:24

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