Abstract Cosmic hydrogen reionization and cosmic production of the first metals are major phase transitions Universe occurring during billion years after Big Bang; however, these still underexplored observationally. Using JWST/NIRSpec prism spectroscopy, we report discovery a sub- L * galaxy at z spec = 8.1623 ± 0.0007, dubbed RX J2129–z8He II , via detection series strong rest-frame UV/optical nebular emission lines clear Lyman break. shows pronounced UV continuum with an extremely steep...

Abstract We present a systematic study of the putative hot gas corona around late-type galaxies (LTGs) residing in Virgo cluster, based on archival Chandra observations. Our sample consists 21 nearly edge-on representing range star formation rate (SFR) 0.2–3 M ⊙ yr −1 and stellar mass ( * ) (0.2–10) × 10 , majority which have not been explored with high-sensitivity X-ray observations so far. Significant extraplanar diffuse (0.5–2 keV) emission is detected only three LTGs, are also highest...

Abstract Four ultraluminous infrared galaxies (ULIRGs) observed with JWST/NIRcam in the Cosmos Evolution Early Release Science program offer an unbiased preview of z ∼ 2 ULIRG population. The objects were originally selected at 24 μ m and have strong polycyclic aromatic hydrocarbon emission features Spitzer/Infrared Spectrometer. four similar stellar masses ∼10 11 M ⊙ but otherwise are quite diverse. One is isolated disk galaxy, it has active nucleus as shown by X-ray observations a bright...

Abstract We present a uniform and sensitive X-ray census of active galactic nuclei (AGNs) in the two nearest galaxy clusters, Virgo Fornax, utilizing newly released source catalogs from first all-sky scan Spectrum-Roentgen-Gamma/eROSITA. A total 50 10 sources are found positionally coincident with member galaxies respectively, down to 0.2–2.3 keV luminosity ∼10 39 erg s −1 reaching out projected distance well beyond virial radius both clusters. The majority nuclear identified. There is weak...

Abstract We report the discovery of SDSS J0849+1114 as first known triple Type 2 Seyfert nucleus. It represents three active black holes that are identified from new spatially resolved optical slit spectroscopy using Dual Imaging Spectrograph on 3.5 m telescope at Apache Point Observatory. also present complementary observations including Hubble Space Telescope Wide Field Camera 3 U - and Y -band imaging, Chandra Advanced CCD Spectrometer S-array X-ray 0.5–8 keV imaging spectroscopy, NSF...

Abstract Dual active galactic nuclei (AGNs), which are the manifestation of two actively accreting supermassive black holes (SMBHs) hosted by a pair merging galaxies, unique laboratory for studying physics SMBH feeding and feedback during an indispensable stage galaxy evolution. In this work, we present NOEMA CO(2–1) observations seven kiloparsec-scale dual-AGN candidates drawn from recent Chandra survey low redshift, optically classified AGN pairs. These systems selected because they show...

Abstract We present a survey of X-ray point sources in the nearest and dynamically young galaxy cluster, Virgo, using archival Chandra observations that sample vicinity 80 early-type member galaxies. The source populations at outskirts these galaxies are particular interest. detect total 1046 (excluding galactic nuclei) out to projected galactocentric radius ∼40 kpc down limiting 0.5–8 keV luminosity <?CDATA $\sim 2\times {10}^{38}\,\mathrm{erg}\,{{\rm{s}}}^{-1}$?> <mml:math...

We present Chandra ACIS-S X-ray imaging spectroscopy for five dual active galactic nucleus (AGN) candidates. Our targets were drawn from a sample of 1286 [O III]-selected AGN pairs systematically selected the Sloan Digital Sky Survey Seventh Data Release. Each contains two nuclei separated by $\sim$3-9 kpc in projection, both which are optically classified as Type 2 (obscured) AGNs based on diagnostic ratios narrow emission lines. Combined with independent, empirical star formation rate...

We present a study of X-ray source populations in M87, the cD galaxy Virgo cluster, using 12 archival {\it Chandra} observations with total exposure $\sim$680 ks spanning about decade. A 346 point-like sources are detected down to limiting 0.5--8 keV luminosity $4\times10^{37}{\rm~erg~s^{-1}}$ and out galactocentric radius $\sim$40 kpc. cross-correlate published catalogs globular clusters (GCs), derived from ACS Cluster Survey Next Generation Survey. This results 122 matches, making it one...

We have conducted a systematic study of X-ray emission from ultra-compact dwarf (UCD) galaxies and extended star clusters (ESCs), based on archival {\sl Chandra} observations. Among sample 511 UCDs ESCs complied the literature, 17 counterparts with 0.5-8 keV luminosities above $\sim$$5\times10^{36} {\rm~erg~s^{-1}}$ are identified, which distributed in eight early-type host galaxies. To facilitate comparison, we also identify 360 globular (GCs) four The properties found to be broadly similar...

Abstract We present a systematic study of the diffuse hot gas around early-type galaxies (ETGs) residing in Virgo cluster, based on archival Chandra observations. Our representative sample consists 79 with low-to-intermediate stellar masses ( M * ≈ 10 9−11 ⊙ ), mass range that has not been extensively explored X-ray observations thus far. detect emission only eight and find five cases substantial fraction detected can be unambiguously attributed to truly gas, their spatial distribution...

We present a Chandra archival study of optically selected AGN pairs at median redshift $\bar{z} \sim$ 0.1. Out 1286 (with projected separations $r_p < 100$ kpc and velocity offsets $\Delta v 600$ km s$^{-1}$) identified from the Sloan Digital Sky Survey Seventh Data Release, we find 67 systems with observations, which represent largest sample studied in X-ray. Among pairs, 21 have both nuclei detected X-rays, 36 one nucleus whereas 10 no X-ray detection. The detection rate, 78/134 = 58%...

Abstract High-resolution X-ray observations offer a unique tool for probing the still-elusive connection between galaxy mergers and active galactic nuclei (AGNs). We present an analysis of nuclear emission in optically selected sample 92 close pairs (with projected separations ≲20 kpc line-of-sight velocity offsets &lt;500 km s −1 ) at low redshift ( <?CDATA $\bar{z}\sim 0.07$?> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mover accent="true"> <mml:mrow>...

Abstract Based on archival Chandra observations with a total exposure of 1.3 Ms, we study X-ray point sources in the Fornax cluster galaxies, primary aim searching for intracluster source populations. We detect 1177 out to projected radius ∼30 arcmin (∼180 kpc) from center and down limiting 0.5–8 keV luminosity ∼3 × 10 37 erg s −1 . construct surface density profile, after excluding associated foreground stars, known globular clusters, ultra-compact dwarfs, galactic nuclei. From this profile...

We present a uniform and sensitive X-ray census of active galactic nuclei (AGNs) in the two nearest galaxy clusters, Virgo Fornax, utilizing newly released source catalogs from first all-sky scan SRG/eROSITA. A total 50 10 sources are found positionally coincident with member galaxies respectively, down to 0.2--2.3 keV luminosity $\sim10^{39}\rm~erg~s^{-1}$ reaching out projected distance well beyond virial radius both clusters. The majority nuclear identified. There is weak evidence that...

We present a systematic search for extraplanar X-ray point sources around 19 late-type, highly inclined disk galaxies residing in the Virgo cluster, based on archival Chandra observations reaching source detection sensitivity of $L\rm(0.5- 8~keV)\sim10^{38}\rm~erg~s^{-1}$. Based cumulative surface density distribution as function projected vertical distance from mid-plane, we identify statistically significant ($\sim3.3\sigma$) excess $\sim20$ within off-disk $0.92'-2.5'$ ($\sim4.4-12\...

Abstract We present a systematic search for extraplanar X-ray point sources around 19 late-type, highly inclined disk galaxies residing in the Virgo cluster, based on archival Chandra observations reaching source detection sensitivity of L (0.5–8 keV) ∼ 10 38 erg s −1 . Based cumulative surface density distribution as function projected vertical distance from midplane, we identify statistically significant (∼3.3 σ ) excess ∼20 within off-disk <mml:math...

Globular clusters (GCs) are thought to harbor the long-sought population of intermediate-mass black holes (IMBHs). We present a systematic search for putative IMBH in 81 Milky Way GCs, based on archival Chandra X-ray observations. find only six GCs significant source positionally coincident with cluster center, which have 0.5-8 keV luminosities between $\sim1\times 10^{30}~{\rm erg~s^{-1}}$ $\sim 4\times10^{33}~{\rm erg~s^{-1}}$. However, spectral and temporal properties these sources can...

Abstract Kiloparsec-scale triple active galactic nuclei (AGNs), potential precursors of gravitationally bound massive black holes (MBHs), are rarely seen objects and believed to play an important role in the evolution MBHs their host galaxies. In this work we present a multiband (3.0, 6.0, 10.0, 15.0 GHz), high-resolution radio imaging AGN candidate, SDSS J0849+1114, using Very Large Array. Two three (A C) detected at 3.0, 15 GHz for first time, both exhibiting steep spectrum over 3–15 (with...

High-resolution X-ray observations offer a unique tool for probing the still elusive connection between galaxy mergers and active galactic nuclei (AGNs). We present an analysis of nuclear emission in optically selected sample 92 close pairs (with projected separations $\lesssim 20$ kpc line-of-sight velocity offsets $&lt;$ 500 km s$^{-1}$) at low redshift ($\bar{z} \sim 0.07$), based on archival Chandra observations. The parent is constructed without imposing optical classification activity,...

Four ultra-luminous infrared galaxies (ULIRGs) observed with JWST/NIRcam in the Cosmos Evolution Early Release Science program offer an unbiased preview of $z\approx2$ ULIRG population. The objects were originally selected at 24 $μ$m and have strong polycyclic aromatic hydrocarbon emission features Spitzer/IRS. four similar stellar masses ${\sim}10^{11}$ M$_\odot$ but otherwise are quite diverse. One is isolated disk galaxy, it has active nucleus as shown by X-ray observations a bright...

We present a systematic study of the putative hot gas corona around late-type galaxies (LTGs) residing in Virgo cluster, based on archival Chandra observations. Our sample consists 21 nearly edge-on representing star formation rate (SFR) range ($0.2-3\rm~M_\odot~yr^{-1}$) stellar mass ($M_*$) $(0.2-10) \times 10^{10}\rm~M_{\odot}$, majority which have not been explored with high-sensitivity X-ray observations so far. Significant extraplanar diffuse (0.5-2 keV) emission is detected only three...