2011ApJ...729..103M


Query : 2011ApJ...729..103M

2011ApJ...729..103M - Astrophys. J., 729, 103 (2011/March-2)

Unraveling the nature of unidentified high galactic latitude Fermi/LAT gamma-ray sources with Suzaku.

MAEDA K., KATAOKA J., NAKAMORI T., STAWARZ L., MAKIYA R., TOTANI T., CHEUNG C.C., DONATO D., GEHRELS N., SAZ PARKINSON P., KANAI Y., KAWAI N., TANAKA Y., SATO R., TAKAHASHI T. and TAKAHASHI Y.

Abstract (from CDS):

Here we report on the results of deep X-ray follow-up observations of four unidentified γ-ray sources detected by the Fermi/LAT instrument at high Galactic latitudes using the X-ray Imaging Spectrometers on board the Suzaku satellite. All of the studied objects were detected with high significance during the first three months of Fermi/LAT operation and subsequently better localized in the first Fermi/LAT catalog (1FGL). For some of them, possible associations with pulsars and active galaxies have subsequently been discussed, and our observations provide an important contribution to this debate. In particular, a bright X-ray point source has been found within the 95% confidence error circle of 1FGL J1231.1-1410. The X-ray spectrum of the discovered Suzaku counterpart of 1FGL J1231.1-1410 is well fitted by a blackbody with an additional power-law component. This supports the recently claimed identification of this source with a millisecond pulsar PSR J1231-1411. For the remaining three Fermi objects, on the other hand, the X-ray observations performed are less conclusive. In the case of 1FGL J1311.7-3429, two bright X-ray point sources were found within the LAT 95% error circle. Even though the X-ray spectral and variability properties for these sources were robustly assessed, their physical nature and relationship with the γ-ray source remain uncertain. Similarly, we found several weak X-ray sources in the field of 1FGL J1333.2+5056, one coinciding with the high-redshift blazar CLASS J1333+5057. We argue that the available data are consistent with the physical association between these two objects, although the large positional uncertainty of the γ-ray source hinders a robust identification. Finally, we have detected an X-ray point source in the vicinity of 1FGL J2017.3+0603. This Fermi object was recently suggested to be associated with a newly discovered millisecond radio pulsar PSR J2017+0603, because of the spatial coincidence and the detection of the γ-ray pulsations in the light curve of 1FGL J2017.3+0603. Interestingly, we have detected the X-ray counterpart of the high-redshift blazar CLASS J2017+0603, located within the error circle of the γ-ray source, while we were only able to determine an X-ray flux upper limit at the pulsar position. All in all, our studies indicate that while a significant fraction of unidentified high Galactic latitude γ-ray sources is related to the pulsar and blazar phenomena, associations with other classes of astrophysical objects are still valid options.

Abstract Copyright:

Journal keyword(s): galaxies: active - gamma rays: general - pulsars: general - radiation mechanisms: non-thermal - X-rays: general

Nomenclature: Table 3: [MKN2011b] 1FGL JHHMM.m+DDMM N=2, [MKN2011b] 1FGL JHHMM.m+DDMM src A N=7.

Simbad objects: 27

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Number of rows : 27
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 3C 111 Sy1 04 18 21.2772425736 +38 01 35.801359968   19.75 18.05     ~ 909 1
2 NAME Geminga Psr 06 33 54.153 +17 46 12.91           ~ 1166 0
3 Fermi bn090708152 gB 10 18 31.70 +26 36 58.7           ~ 31 0
4 NAME Lockman Hole reg 10 45 00.0 +58 00 00           ~ 800 0
5 [MKN2011b] 1FGL J1231.1-1410 X 12 31 10 -14 11.5           ~ 1 0
6 PSR J1231-1411 Psr 12 31 11.3069 -14 11 43.628           ~ 101 0
7 [MKN2011b] 1FGL J1311.7-3429 src A X 13 11 45 -34 30.5           ~ 1 0
8 [MKN2011b] 1FGL J1311.7-3429 src B X 13 11 46 -34 32.0           ~ 1 0
9 PSR J1311-3430 Psr 13 11 47.6 -34 30 35           ~ 135 1
10 QSO B1313-333 QSO 13 16 07.98594757 -33 38 59.1726741   18.04 20.0 17.23   ~ 238 1
11 NAME Centaurus A Sy2 13 25 27.61521044 -43 01 08.8050291   8.18 6.84 6.66   ~ 4303 3
12 [MKN2011b] 1FGL J1333.2+5056 src B X 13 32 39 +51 01.9           ~ 1 0
13 [MKN2011b] 1FGL J1333.2+5056 src A X 13 33 00 +50 59.0           ~ 1 0
14 [MKN2011b] 1FGL J1333.2+5056 src C X 13 33 06 +51 00.8           ~ 1 0
15 [MKN2011b] 1FGL J1333.2+5056 src E X 13 33 31 +50 53.5           ~ 1 0
16 ICRF J133353.7+505735 QSO 13 33 53.78387760 +50 57 35.9158105   20.09 19.71 19.6   ~ 64 1
17 [MKN2011b] 1FGL J1333.2+5056 src D X 13 33 55 +50 58.0           ~ 1 0
18 NGC 6251 Sy2 16 32 31.96989253 +82 32 16.3999044 15.24 14.66 12.89 7.62   ~ 700 0
19 3EG J1735-1500 gam 17 36 -15.0           ~ 18 0
20 PSR J1836+5925 Psr 18 36 13.661 +59 25 29.77           ~ 133 1
21 QSO J2015+371 BLL 20 15 28.72978661 +37 10 59.5147372     21.82 21.4   ~ 271 2
22 PMN J2017+0603 Rad 20 17 12.80 +06 03 10.0           ~ 3 0
23 [MKN2011b] 1FGL J2017.3+0603 X 20 17 14 +06 03.1           ~ 1 0
24 PSR J2017+0603 Psr 20 17 22.7048 +06 03 05.585           ~ 86 1
25 PSR J2021+3651 Psr 20 21 05.40 +36 51 04.5           ~ 171 1
26 GRO J2021+37 gam 20 21 19.9 +37 15 12           ~ 92 2
27 NAME Gould Belt PoG ~ ~           ~ 827 1

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2022.12.08-14:57:49

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