A5002134845- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Astrophysical Phenomena and Observations
- Gamma-ray bursts and supernovae
- Astrophysics and Cosmic Phenomena
- Cosmology and Gravitation Theories
- Radio Astronomy Observations and Technology
- Stellar, planetary, and galactic studies
- Black Holes and Theoretical Physics
- Astrophysics and Star Formation Studies
- CCD and CMOS Imaging Sensors
- Astronomical Observations and Instrumentation
- Relativity and Gravitational Theory
Diego Portales University
2019-2024
North-West University
2024
Debre Berhan University
2019-2020
Ethiopian Space Science and Technology Institute
2019-2020
WISE J224607.6–052634.9 (W2246–0526) is a hot dust-obscured galaxy at z = 4.601, and the most luminous obscured quasar known to date. W2246–0526 harbors heavily supermassive black hole that likely accreting above Eddington limit. We present observations with Atacama Large Millimeter/submillimeter Array (ALMA) in seven bands, including band 10, of brightest far-infrared (FIR) fine-structure emission lines this galaxy: [OI] 63 μm , [OIII] 88 [NII] 122 145 [CII] 158 205 [CI] 370 609 . A...
Hot Dust-Obscured Galaxies (Hot DOGs), discovered by the "W1W2 dropout" selection at high redshifts ($z\sim$ 2-4), are a rare population of hyper-luminous obscured quasars. Their number density is comparable to similarly luminous type 1 quasars in same redshift range, potentially representing short, yet critical stage galaxy evolution. The evolution their towards low redshift, however, remains unclear as function heavily biased against objects $z\lesssim2$. We combine data from WISE and...
We present spatially resolved dust-continuum ALMA observations from rest-frame $\sim$60 to $\sim$600 $\mu$m (bands 3-10) of the hyperluminous hot dust-obscured galaxy (hot DOG) WISE J224607.6-052634.9 (W2246-0526), at redshift $z=4.6$. W2246-0526 is interacting with least three companion galaxies, forming a system connected by tidal streams. model multiwavelength dust continuum using modified blackbody, which we derive properties (mass, emissivity index, area emitting region, and...
Abstract Hot dust-obscured galaxies (Hot DOGs), discovered by the “W1W2 dropout” selection at high redshifts ( z ∼ 2–4), are a rare population of hyperluminous obscured quasars. Their number density is comparable to similarly luminous type 1 quasars in same redshift range, potentially representing short, yet critical stage galaxy evolution. The evolution their toward low redshift, however, remains unclear as function heavily biased against objects ≲ 2. We combine data from Wide-field...
We present spatially resolved dust-continuum ALMA observations from rest frame ∼,60 to ∼,600 upmum (bands 3--10) of the hyperluminous hot dust-obscured galaxy (hot DOG) WISE J224607.6--052634.9 (W2246--0526), at redshift z=4.6. W2246--0526 is interacting with least three companion galaxies, forming a system connected by tidal streams. model multiwavelength dust continuum using modified blackbody, which we derive properties (mass, emissivity index, area emitting region, and temperature) in...
We report the identification of Lyman break galaxy (LBG) candidates around most luminous hot dust-Obscured (Hot DOG) known, WISE J224607.56−052634.9 (W2246−0526) at z = 4.601, using deep r -, i and -band imaging from Gemini Multi-Object Spectrograph South (GMOS-S). used surface density LBGs to probe megaparsec-scale environment W2246−0526 characterize its richness evolutionary state. identified LBG in vicinity selection criteria developed Subaru Deep Field XMM-Newton Field, slightly modified...
Abstract Hot dust-obscured galaxies (Hot DOGs) are a rare population of hyperluminous infrared discovered by the Wide-field Infrared Survey Explorer mission. Despite significant obscuration active galactic nucleus (AGN) dust in these systems, pronounced broad and blueshifted emission lines often observed. Previous work has shown that eight DOGs, referred to as blue-excess DOGs (BHDs), present blue excess consistent with type 1 quasar their UV–optical spectral energy distributions (SEDs),...
We study a sample of 48127 galaxies selected from the SDSS MPA-JHU catalogue, with $\log M_{\star}/M_{\odot} = 10.73 - 11.03$ and $z<0.1$. Local in this stellar mass range have been shown to systematically shorter assembly times within their inner regions ($<0.5~R_{50}$) when compared that galaxy as whole, contrary lower or higher which show consistent at all radii. Hence, we refer these Inside-Out Assembled Galaxy (IOAG) candidates. find majority IOAG candidates well-detected emission lines...
WISE J224607.6-052634.9 (W2246-0526) is a hot dust-obscured galaxy at $z$ = 4.601, and the most luminous obscured quasar known to date. W2246-0526 harbors heavily supermassive black hole that likely accreting above Eddington limit. We present observations with Atacama Large Millimeter/submillimeter Array (ALMA) in seven bands, including band 10, of brightest far-infrared (FIR) fine-structure emission lines this galaxy: [OI]$_{63\mu m}$, [OIII]$_{88\mu [NII]$_{122\mu [OI]$_{145\mu...
Hot Dust-Obscured Galaxies (Hot DOGs) are a rare population of hyper-luminous infrared galaxies discovered by the WISE mission. Despite significant obscuration AGN dust in these systems, pronounced broad and blue-shifted emission lines often observed. Previous work has shown that 8 DOGs, referred to as Blue-excess DOGs (BHDs), present blue excess consistent with type 1 quasar their UV-optical SEDs, which been originate from light obscured central engine scattered into line sight. We an...
We report integral field spectroscopy observations with the Near-Infrared Spectrograph on board JWST targeting 60 kpc environment surrounding most luminous quasar known at $z=4.6$. detect ionized gas filaments 40 scales connecting a network of merging galaxies likely to form cluster. find regions low ionization consistent large-scale shock excitation central dust-obscured quasar, out distances nearly eight times effective stellar radius host galaxy. In nuclear region, we an outflow driven by...
Hot dust-obscured galaxies (Hot DOGs), are a family of hyper-luminous, heavily obscured quasars. A number studies have shown that these objects reside in significantly overdense regions the Universe based on identification companions at optical through far-IR wavelengths. Here we present further characterization their environments by studying surface density Lyman break galaxy (LBG) candidates vicinity three DOGs. For two them, WISE J041010.60-091305.2 z=3.631 and J083153.25+014010.8...
Hot dust-obscured galaxies (hot DOGs) are a family of hyper-luminous, heavily obscured quasars. A number studies based on the identification companions at optical to far-infrared (FIR) wavelengths have shown that these objects reside in significantly overdense regions Universe. Here we present further characterisation their environments by studying surface density Lyman break galaxy (LBG) candidates vicinity three hot DOGs. For two them, WISE J041010.60–091305.2 (W0410--0913) $z=3.631$ and...
Abstract In this work, we study the properties of galaxies that are showing inside-out assembly (which call assembled galaxies; IOAGs), with main aim to understand better their and morphological transformation. We analysed a sample from Sloan Digital Sky Survey (SDSS) Data Release 8 (DR8), stellar masses in range log M * = 10.73 – 11.03 ⊙ at z < 0.1, analyze location mass-SFR color-stellar mass diagram. found IOAGs have different spectroscopic properties, most them being classified either...
We report the identification of Lyman Break Galaxy (LBG) candidates around most luminous Hot Dust-Obscured (Hot DOG) known, WISE J224607.56$-$052634.9 (W2246$-$0526) at $z=4.601$, using deep \textit{r}-, \textit{i}-, and \textit{z}-band imaging from Gemini Multi-Object Spectrograph South (GMOS-S). use surface density LBGs to probe Mpc-scale environment W2246$-$0526 characterize its richness evolutionary state. identify LBG in vicinity selection criteria developed by \cite{2004VOuchi}...
We explored a sample of 545 local galaxies using data from the 3XMM-DR7 and SDSS-DR8 surveys. carried out all analyses up to z\,$\sim$\,0.2, we studied relation between X/O flux ratio accretion rate for different classes active such as LINERs Seyfert 2. obtained slight correlation two parameters if whole AGN is used. However, Sy2 show properties, anti-correlation, respectively. This could confirm that have efficiencies maybe disc properties,as has been suggested previously. Keywords: -...