scholarly journals Gould Belt members in X-ray RAVE: cross-matching RAVE stars with 3XMM point sources

2019 ◽  
Vol 364 (1) ◽  
Author(s):  
B. Coşkunoğlu ◽  
O. Plevne ◽  
M. T. Özkan
Keyword(s):  
Point Sources ◽  
X Ray ◽  
Gould Belt ◽  
Cross Matching

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 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 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.

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

scholarly journals X-Ray and Near-Infrared Spectroscopy of Dim X-Ray Point Sources Constituting the Galactic Ridge X-Ray Emission

2014 ◽  
Vol 1 (1) ◽  
pp. 222-226
Author(s):  
Kumiko Morihana ◽  
Masahiro Tsujimoto ◽  
Ken Ebisawa
Keyword(s):  
Near Infrared ◽  
Cataclysmic Variables ◽  
Point Sources ◽  
X Ray ◽  
Nir Imaging ◽  
Group A ◽  
Field L ◽  
Imaging And Spectroscopy ◽  
Group B ◽  
Thermal Sources

We present the results of X-ray and Near-Infrared observations of the Galactic Ridge X-ray Emission (GRXE). We extracted 2,002 X-ray point sources in the <em>Chandra</em> Bulge Field (l =0°.113, b = 1°.424) down to ~10<sup>-14.8</sup> ergscm<sup>-2</sup>s<sup>-1</sup> in 2-8 keV band with the longest observation (900 ks) of the GRXE. Based on X-ray brightness and hardness, we classied the X-ray point sources into three groups: A (hard), B (soft and broad spectrum), and C (soft and peaked spectrum). In order to know populations of the X-ray point sources, we carried out NIR imaging and spectroscopy observation. We identied 11% of X-ray point sources with NIR and extracted NIR spectra for some of them. Based on X-ray and NIR properties, we concluded that non-thermal sources in the group A are mostly active galactic nuclei and the thermal sources are mostly white dwarf binaries such as cataclysmic variables (CVs) and Pre-CVs. We concluded that the group B and C sources are X-ray active stars in flare and quiescence, respectively.

scholarly journals Mid-infrared and X-ray luminosity correlations of X-ray point sources in NGC 1399

2013 ◽  
Vol 434 (1) ◽  
pp. 639-651 ◽  
Author(s):  
P. Shalima ◽  
V. Jithesh ◽  
K. Jeena ◽  
R. Misra ◽  
S. Ravindranath ◽  
...  
Keyword(s):  
Point Sources ◽  
Mid Infrared ◽  
X Ray

scholarly journals Near-infrared spectroscopy of faint discrete X-ray point sources constituting the Galactic ridge X-ray emission

2016 ◽  
Vol 68 (4) ◽  
pp. 57 ◽  
Author(s):  
Kumiko Morihana ◽  
Masahiro Tsujimoto ◽  
Pierre Dubath ◽  
Tessei Yoshida ◽  
Kensuke Suzuki ◽  
...  
Keyword(s):  
Infrared Spectroscopy ◽  
Near Infrared Spectroscopy ◽  
Near Infrared ◽  
Point Sources ◽  
X Ray

scholarly journals X-Ray Emission from Expanding Shells in NGC 3077

2004 ◽  
Vol 217 ◽  
pp. 310-311
Author(s):  
Jürgen Ott ◽  
Crystal L. Martin ◽  
Fabian Walter
Keyword(s):  
Thermal Emission ◽  
Dwarf Galaxy ◽  
Point Sources ◽  
Starburst Galaxy ◽  
Interstellar Gas ◽  
X Ray ◽  
Hot Gas ◽  
Hα Emission ◽  
Emission Models ◽  
Expanding Shells

Deep Chandra observations of NGC 3077, a starburst dwarf galaxy in the M81 triplet, resolve the X-ray emission from several supershells. The emission is brightest in the cavities defined by expanding shells detected previously in Hα emission. Thermal emission models fitted to the data imply temperatures ranging from 1.3 to 4.9 × 106 K. The total 0.3–6.0 keV X-ray luminosity is 2 − 5 × 1039ergs−1 (depending on the selected thermal plasma model). Most (85%) of the X-ray luminosity in NGC 3077 comes from the hot interstellar gas; the remainder comes from six X-ray point sources. The radial density profile of the hot gas is not as steep as that expected in a freely expanding wind (e.g., as seen in the neighboring starburst galaxy M 82) implying that the hot gas is still confined by the Hα shells.

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