scholarly journals A DeepChandraCatalog of X‐Ray Point Sources toward the Galactic Center

2003 ◽  
Vol 589 (1) ◽  
pp. 225-241 ◽  
Author(s):  
M. P. Muno ◽  
F. K. Baganoff ◽  
M. W. Bautz ◽  
W. N. Brandt ◽  
P. S. Broos ◽  
...  
Keyword(s):  
Galactic Center ◽  
Point Sources ◽  
X Ray

scholarly journals NuSTARHARD X-RAY SURVEY OF THE GALACTIC CENTER REGION. II. X-RAY POINT SOURCES

2016 ◽  
Vol 825 (2) ◽  
pp. 132 ◽  
Author(s):  
JaeSub Hong ◽  
Kaya Mori ◽  
Charles J. Hailey ◽  
Melania Nynka ◽  
Shuo Zhang ◽  
...  
Keyword(s):  
Galactic Center ◽  
Point Sources ◽  
X Ray ◽  
Center Region ◽  
Region Ii

scholarly journals A CATALOG OF X-RAY POINT SOURCES FROM TWO MEGASECONDS OF CHANDRA OBSERVATIONS OF THE GALACTIC CENTER

2009 ◽  
Vol 181 (1) ◽  
pp. 110-128 ◽  
Author(s):  
M. P. Muno ◽  
F. E. Bauer ◽  
F. K. Baganoff ◽  
R. M. Bandyopadhyay ◽  
G. C. Bower ◽  
...  
Keyword(s):  
Galactic Center ◽  
Point Sources ◽  
X Ray

scholarly journals RADIAL DISTRIBUTION OF X-RAY POINT SOURCES NEAR THE GALACTIC CENTER

2009 ◽  
Vol 706 (1) ◽  
pp. 223-237 ◽  
Author(s):  
JaeSub Hong ◽  
Maureen van den Berg ◽  
Jonathan E. Grindlay ◽  
Silas Laycock
Keyword(s):  
Radial Distribution ◽  
Galactic Center ◽  
Point Sources ◽  
X Ray

scholarly journals MAXI/SSC all-sky maps from 0.7 keV to 4 keV

2020 ◽  
Vol 72 (2) ◽  
Author(s):  
Satoshi Nakahira ◽  
Hiroshi Tsunemi ◽  
Hiroshi Tomida ◽  
Shinya Nakashima ◽  
Ryuho Kataoka ◽  
...  
Keyword(s):  
Solid State ◽  
Galactic Center ◽  
Thermal Emission ◽  
Brightness Distribution ◽  
Point Sources ◽  
X Ray ◽  
The North ◽  
Sky Survey ◽  
Solar Wind Charge Exchange ◽  
X Ray Background

Abstract By accumulating data from the Solid-state Slit Camera (SSC) on board the MAXI mission from 2009 to 2011, diffuse X-ray background maps were obtained in energies of 0.7–1.0, 1.0–2.0, and 2.0–4.0 keV. They are the first to be derived with a solid-state instrument, and to be compared with the previous ROSAT all-sky survey result. While the SSC map in the highest energy band is dominated by point sources and the Galactic diffuse X-ray emission, that in 0.7–1.0 keV reveals an extended X-ray structure, of which the brightness distribution is very similar to that observed with ROSAT about 20 years before. As in the ROSAT result, the emission is dominated by a bright arc-like structure, which appears to be part of a circle of ∼50° radius centered at about (l,b) ∼ (340°, 15°). In addition, the SSC map suggests a fainter and larger ellipse, which is elongated in the north–south direction and roughly centered at the Galactic center. The spectrum of these structures is explained as thin thermal emission from a plasma, with a temperature of ∼0.31 keV and an abundance of ∼0.3 solar. Based on SSC observation conditions including low solar activity, the solar wind charge exchange signals are estimated to be negligible in the present SSC maps, as well as in the >0.56 keV ROSAT map. A brief discussion is given on the results obtained.

scholarly journals Survey of Gravitationally Lensed Objects in HSC Imaging (SuGOHI) – VII. Discovery and confirmation of three strongly lensed quasars†

2021 ◽  
Vol 502 (1) ◽  
pp. 1487-1493
Author(s):  
Anton T Jaelani ◽  
Cristian E Rusu ◽  
Issha Kayo ◽  
Anupreeta More ◽  
Alessandro Sonnenfeld ◽  
...  
Keyword(s):  
Spectroscopic Data ◽  
Point Sources ◽  
Sloan Digital Sky Survey ◽  
Early Type ◽  
Blue Point ◽  
X Ray ◽  
Quasar Spectra ◽  
Strategic Program ◽  
Early Type Galaxy

ABSTRACT We present spectroscopic confirmation of three new two-image gravitationally lensed quasars, compiled from existing strong lens and X-ray catalogues. Images of HSC J091843.27–022007.5 show a red galaxy with two blue point sources at either side, separated by 2.26 arcsec. This system has a source and a lens redshifts zs = 0.804 and zℓ = 0.459, respectively, as obtained by our follow-up spectroscopic data. CXCO J100201.50+020330.0 shows two point sources separated by 0.85 arcsec on either side of an early-type galaxy. The follow-up spectroscopic data confirm the fainter quasar has the same redshift with the brighter quasar from the Sloan Digital Sky Survey (SDSS) fiber spectrum at zs = 2.016. The deflecting foreground galaxy is a typical early-type galaxy at a redshift of zℓ = 0.439. SDSS J135944.21+012809.8 has two point sources with quasar spectra at the same redshift zs = 1.096, separated by 1.05 arcsec, and fits to the HSC images confirm the presence of a galaxy between these. These discoveries demonstrate the power of the Hyper Suprime-Cam Subaru Strategic Program (HSC-SSP)’s deep imaging and wide sky coverage. Combined with existing X-ray source catalogues and follow-up spectroscopy, the HSC-SSP provides us unique opportunities to find multiple-image quasars lensed by a foreground galaxy.

scholarly journals The XXL Survey

2018 ◽  
Vol 620 ◽  
pp. A18 ◽  
Author(s):  
C. H. A. Logan ◽  
B. J. Maughan ◽  
M. N. Bremer ◽  
P. Giles ◽  
M. Birkinshaw ◽  
...  
Keyword(s):  
Angular Resolution ◽  
False Positive Rate ◽  
High Sensitivity ◽  
Point Sources ◽  
Selection Function ◽  
X Rays ◽  
Cluster Emission ◽  
X Ray ◽  
Wide Range ◽  
Function Modelling

Context. The XMM-XXL survey has used observations from the XMM-Newton observatory to detect clusters of galaxies over a wide range in mass and redshift. The moderate PSF (FWHM ~ 6″ on-axis) of XMM-Newton means that point sources within or projected onto a cluster may not be separated from the cluster emission, leading to enhanced luminosities and affecting the selection function of the cluster survey. Aims. We present the results of short Chandra observations of 21 galaxy clusters and cluster candidates at redshifts z > 1 detected in the XMM-XXL survey in X-rays or selected in the optical and infra-red. Methods. With the superior angular resolution of Chandra, we investigate whether there are any point sources within the cluster region that were not detected by the XMM-XXL analysis pipeline, and whether any point sources were misclassified as distant clusters. Results. Of the 14 X-ray selected clusters, 9 are free from significant point source contamination, either having no previously unresolved sources detected by Chandra or with less than about 10% of the reported XXL cluster flux being resolved into point sources. Of the other five sources, one is significantly contaminated by previously unresolved AGN, and four appear to be AGN misclassified as clusters. All but one of these cases are in the subset of less secure X-ray selected cluster detections and the false positive rate is consistent with that expected from the XXL selection function modelling. We also considered a further seven optically selected cluster candidates associated with faint XXL sources that were not classed as clusters. Of these, three were shown to be AGN by Chandra, one is a cluster whose XXL survey flux was highly contaminated by unresolved AGN, while three appear to be uncontaminated clusters. By decontaminating and vetting these distant clusters, we provide a pure sample of clusters at redshift z > 1 for deeper follow-up observations, and demonstrate the utility of using Chandra snapshots to test for AGN in surveys with high sensitivity but poor angular resolution.

scholarly journals Discovery of a bright X-ray transient in the Galactic Center with XMM-Newton

2005 ◽  
Vol 430 (1) ◽  
pp. L9-L12 ◽  
Author(s):  
D. Porquet ◽  
N. Grosso ◽  
V. Burwitz ◽  
I. L. Andronov ◽  
B. Aschenbach ◽  
...  
Keyword(s):  
Galactic Center ◽  
X Ray

Two-Dimensional X-ray Waveguides and Point Sources

Science ◽  
2002 ◽  
Vol 297 (5579) ◽  
pp. 230-234 ◽  
Author(s):  
F. Pfeiffer
Keyword(s):  
Point Sources ◽  
Two Dimensional ◽  
X Ray
Sign in / Sign up

Export Citation Format

Share Document