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 ChandraStudy of X‐Ray Point Sources in the Early‐Type Galaxy NGC 4552 (M89)

2005 ◽  
Vol 631 (2) ◽  
pp. 809-819 ◽  
Author(s):  
Yueheng Xu ◽  
Haiguang Xu ◽  
Zhongli Zhang ◽  
Arunav Kundu ◽  
Yu Wang ◽  
...  
Keyword(s):  
Point Sources ◽  
Early Type ◽  
X Ray ◽  
Early Type Galaxy

The Trail of Discrete X‐Ray Sources in the Early‐Type Galaxy NGC 4261: Anisotropy in the Globular Cluster Distribution?

2005 ◽  
Vol 634 (1) ◽  
pp. 272-280 ◽  
Author(s):  
Lea Giordano ◽  
Luca Cortese ◽  
Ginevra Trinchieri ◽  
Anna Wolter ◽  
Monica Colpi ◽  
...  
Keyword(s):  
Globular Cluster ◽  
Early Type ◽  
X Ray ◽  
Cluster Distribution ◽  
Early Type Galaxy

The X‐Ray–faint Early‐Type Galaxy NGC 4697

2000 ◽  
Vol 544 (1) ◽  
pp. 293-301 ◽  
Author(s):  
Jimmy A. Irwin ◽  
Craig L. Sarazin ◽  
Joel N. Bregman
Keyword(s):  
Early Type ◽  
X Ray ◽  
Early Type Galaxy

scholarly journals COMPARING X-RAY AND DYNAMICAL MASS PROFILES IN THE EARLY-TYPE GALAXY NGC 4636

2009 ◽  
Vol 706 (2) ◽  
pp. 980-994 ◽  
Author(s):  
Ria Johnson ◽  
Dalia Chakrabarty ◽  
Ewan O'Sullivan ◽  
Somak Raychaudhury
Keyword(s):  
Early Type ◽  
Dynamical Mass ◽  
X Ray ◽  
Early Type Galaxy ◽  
Mass Profiles

scholarly journals Metal abundances in the hot ISM of early-type galaxies

2009 ◽  
Vol 5 (H15) ◽  
pp. 283-283
Author(s):  
Philip J. Humphrey ◽  
David A. Buote
Keyword(s):  
Mass Range ◽  
Point Sources ◽  
Early Type ◽  
X Ray ◽  
Object A ◽  
Galaxy Groups ◽  
History Of ◽  
Solar Abundances ◽  
Entire History ◽  
Metal Abundances

Understanding the process of metal enrichment is one of the key problems for our picture of structure formation and evolution, in which early-type galaxies are a crucial ingredient. X-ray observations provide a powerful tool for measuring the metal distributions in their hot ISM, which is shaped by their entire history of star-formation, evolution and feedback. In Fig 1 (left panel), we summarize the results of a Chandra survey of metals in early-type galaxies, supplemented with Suzaku data (Humphrey & Buote 2006, P. Humphrey et al., in prep.). Chandra is particularly suited to this study, as it enables temperature gradients and X-ray point sources to be resolved, mitigating two important sources of bias (e.g., Buote & Fabian 1998; Fabbiano et al. 1994). We found on average that the ISM is at least as metal-rich as the stars, and we did not find the problematical, highly sub-solar, abundances historically reported. The abundance ratios of O, Ne, Mg, Si and S with respect to Fe are similar to the centres of massive groups and clusters, suggesting homology in the enrichment process over a wide mass range. Finally, using high-quality Suzaku data, we were able to resolve, for the first time in a galaxy-scale (≲1013M⊙) object, a radial abundance gradient similar to those seen in some bright galaxy groups (Fig. 1, right panel).

scholarly journals Discovering novae in early-type galaxies with MUSE: A chance find in NGC 1404, and 12 more candidates from an archival search

2020 ◽  
Vol 494 (1) ◽  
pp. L1-L5
Author(s):  
Russell J Smith
Keyword(s):  
Elliptical Galaxy ◽  
Point Sources ◽  
Short Time Scale ◽  
Early Type ◽  
X Ray ◽  
Type Ia ◽  
Hα Emission ◽  
Integral Field Spectrograph ◽  
Short Time ◽  
Nova Outburst

ABSTRACT I report the discovery of a transient broad-Hα point source in the outskirts of the giant elliptical galaxy NGC 1404, discovered in archival observations taken with the Multi-Unit Spectroscopic Explorer (MUSE) integral field spectrograph. The Hα line width of 1950 km s−1 full width at half-maximum, and luminosity of (4.1 ± 0.1) × 1036 erg s−1, are consistent with a nova outburst, and the source is not visible in MUSE data obtained 9 months later. A transient soft X-ray source was detected at the same position (within <1 arcsec), 14 yr before the Hα transient. If the X-ray and Hα emission are from the same object, the source may be a short-time-scale recurrent nova with a massive white dwarf accretor, and hence a possible Type-Ia supernova progenitor. Selecting broad-Hα point sources in MUSE archival observations for a set of nearby early-type galaxies, I discovered 12 more nova candidates with similar properties to the NGC 1404 source, including five in NGC 1380 and four in NGC 4365. Multi-epoch data are available for four of these twelve sources; all four are confirmed to be transient on ∼1 yr time-scales, supporting their identification as novae.

Evidence for environmental effects on early-type galaxy X-ray halos

1991 ◽  
Vol 367 ◽  
pp. 476 ◽  
Author(s):  
Raymond E., III White ◽  
Craig L. Sarazin
Keyword(s):  
Environmental Effects ◽  
Early Type ◽  
X Ray ◽  
Early Type Galaxy

scholarly journals First detection of stacked X-ray emission from cosmic web filaments

2020 ◽  
Vol 643 ◽  
pp. L2
Author(s):  
H. Tanimura ◽  
N. Aghanim ◽  
A. Kolodzig ◽  
M. Douspis ◽  
N. Malavasi
Keyword(s):  
Point Sources ◽  
Sloan Digital Sky Survey ◽  
Gas Temperature ◽  
Astrophysical Plasma ◽  
X Ray ◽  
Galaxy Groups ◽  
Hot Gas ◽  
Code Model ◽  
Sky Survey ◽  
Statistical Detection

We report the first statistical detection of X-ray emission from cosmic web filaments in ROSAT data. We selected 15 165 filaments at 0.2 <  z <  0.6 ranging from 30 Mpc to 100 Mpc in length, identified in the Sloan Digital Sky Survey survey. We stacked the X-ray count-rate maps from ROSAT around the filaments, excluding resolved galaxy groups and clusters above the mass of ∼3 × 1013 M⊙ as well as the detected X-ray point sources from the ROSAT, Chandra, and XMM-Newton observations. The stacked signal results in the detection of the X-ray emission from the cosmic filaments at a significance of 4.2σ in the energy band of 0.56−1.21 keV. The signal is interpreted, assuming the Astrophysical Plasma Emission Code model, as an emission from the hot gas in the filament-core regions with an average gas temperature of 0.9−0.6+1.0 keV and a gas overdensity of δ ∼ 30 at the center of the filaments. Furthermore, we show that stacking the SRG/eROSITA data for ∼2000 filaments only would lead to a ≳5σ detection of their X-ray signal, even with an average gas temperature as low as ∼0.3 keV.

Sign in / Sign up

Export Citation Format

Share Document