Sowgat Muzahid
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View article: MUSEQuBES: The Column Density, Covering Fraction, Mass, and Environmental Dependence of Cool H <scp>i</scp> Gas Around Low-Redshift Galaxies
MUSEQuBES: The Column Density, Covering Fraction, Mass, and Environmental Dependence of Cool H <span>i</span> Gas Around Low-Redshift Galaxies Open
We investigate cool H i gas traced by Lyman series absorption around 256 galaxies at z ≈ 0.48 (median stellar mass, $\log _{10}~(M_{\star }/\rm {\rm M}_{\odot })$ =8.7) using 15 background quasars (median impact parameter, D = 140 pkpc), a…
View article: Reporting a Deficit of Intrinsic N <scp>v</scp> Absorbers in Core-dominated, Radio-loud Quasars
Reporting a Deficit of Intrinsic N <span>v</span> Absorbers in Core-dominated, Radio-loud Quasars Open
We searched the Hubble Space Telescope Cosmic Origins Spectrograph archive for ultraviolet spectra of 428 AGN to identify intrinsic N v absorption systems. We filtered out Type 2 AGN, blazars, and spectra that do not cover at least part of…
View article: MUSEQuBES: Physical conditions, origins, and multi-element abundances of the circumgalactic medium of an isolated, star-forming dwarf galaxy at z=0.57
MUSEQuBES: Physical conditions, origins, and multi-element abundances of the circumgalactic medium of an isolated, star-forming dwarf galaxy at z=0.57 Open
In dwarf galaxy models, outflows expel metal-enriched interstellar medium (ISM) into the circumgalactic medium (CGM) to reproduce their observed low metallicities, but measurements of dwarf CGM properties are scarce. We present a study of …
View article: Kinematic analysis of an Ultra-Strong MgII absorber at z~1.13 linking to Circumgalactic Gas Structures
Kinematic analysis of an Ultra-Strong MgII absorber at z~1.13 linking to Circumgalactic Gas Structures Open
We present a spectroscopic and imaging analysis of the $z_{gal} \approx 1.1334$ ultra-strong MgII absorption system identified in the $VLT$/UVES spectrum of a background quasar located at $ρ\approx 18$ kpc from a star-forming galaxy. Low i…
View article: MUSEQuBES: The Column Density, Covering Fraction, and Mass of O <scp>vi</scp>-bearing Gas in and Around Low-redshift Galaxies
MUSEQuBES: The Column Density, Covering Fraction, and Mass of O <span>vi</span>-bearing Gas in and Around Low-redshift Galaxies Open
We present a study of O vi -bearing gas around 247 low-mass (median = 8.7) galaxies at low redshifts (0.1 < z < 0.7) using background quasars as part of the MUSE Quasar-fields Blind Emitters Survey (MUSEQuBES). We find that th…
View article: The Morphology and Kinematics of a Giant, Symmetric Nebula around a Radio-loud Quasar 3C 57: Extended Rotating Gas or Biconical Outflows?
The Morphology and Kinematics of a Giant, Symmetric Nebula around a Radio-loud Quasar 3C 57: Extended Rotating Gas or Biconical Outflows? Open
Gas flows between galaxies and the circumgalactic medium play a crucial role in galaxy evolution. When ionized by a quasar, these gas flows can be directly traced as giant nebulae. We present a study of a giant nebula around a radio-loud q…
View article: MUSEQuBES: The Kinematics of O vi-bearing Gas in and around Low-redshift Galaxies
MUSEQuBES: The Kinematics of O vi-bearing Gas in and around Low-redshift Galaxies Open
We present a detailed study of the kinematics of O vi -bearing gas around 60 low-mass (median = 8.9) galaxies at low redshift (0.1 < z < 0.7) using background quasars (median impact parameter ≈115 kpc) as part of the MUSE Quas…
View article: MUSEQuBES: Connecting H <scp>i</scp> Absorption with Ly<i>α</i> Emitters at <i>z</i> ≈ 3.3
MUSEQuBES: Connecting H <span>i</span> Absorption with Ly<i>α</i> Emitters at <i>z</i> ≈ 3.3 Open
We present a comprehensive analysis of H i absorption around 96 Ly α emitters (LAEs) at z ≈ 3.3 (median Ly α luminosity ≈10 42 erg s −1 ). These LAEs were identified within eight MUSE fields, each on the sky and centered on a bright …
View article: MUSEQuBES: Unveiling Cosmic Web Filaments at z ≈ 3.6 through Dual Absorption and Emission Line Analysis
MUSEQuBES: Unveiling Cosmic Web Filaments at z ≈ 3.6 through Dual Absorption and Emission Line Analysis Open
According to modern cosmological models, galaxies are embedded within cosmic filaments, which supply a continuous flow of pristine gas, fueling star formation and driving their evolution. However, due to their low density, the direct detec…
View article: MusE GAs FLOw and Wind (MEGAFLOW)
MusE GAs FLOw and Wind (MEGAFLOW) Open
We present the design, rationale, properties, and catalogues of the MusE Gas FLOw and Wind survey (MEGAFLOW) of cool gaseous halos of z ≃ 1.0 galaxies, using low-ionisation Mg II absorption systems. The survey consists of 22 quasar fields …
View article: MUSEQuBES: Unveiling Cosmic Web Filaments at $z\approx3.6$ through Dual Absorption and Emission Line Analysis
MUSEQuBES: Unveiling Cosmic Web Filaments at $z\approx3.6$ through Dual Absorption and Emission Line Analysis Open
According to modern cosmological models, galaxies are embedded within cosmic filaments, which supply a continuous flow of pristine gas, fueling star formation and driving their evolution. However, due to their low density, the direct detec…
View article: MUSEQuBES: Connecting HI absorption with Ly$α$ emitters at $z \approx 3.3$
MUSEQuBES: Connecting HI absorption with Ly$α$ emitters at $z \approx 3.3$ Open
We present a comprehensive analysis of HI absorption around 96 lya emitters (LAEs) at $z\approx3.3$ (median lya luminosity $\approx10^{42}$ erg.s$^{-1}$). These LAEs were identified within 8 MUSE fields, each $1'\times1'$ on the sky and ce…
View article: MusE GAs FLOw and Wind (MEGAFLOW) XII. Rationale and design of a MgII survey of the cool circum-galactic medium with MUSE and UVES: The MEGAFLOW Survey
MusE GAs FLOw and Wind (MEGAFLOW) XII. Rationale and design of a MgII survey of the cool circum-galactic medium with MUSE and UVES: The MEGAFLOW Survey Open
We present the design, rationale, properties and catalogs of the MusE Gas FLOw and Wind survey (MEGAFLOW), a survey of the cool gaseous halos of $z\sim1$ galaxies using low-ionization MgII absorption systems. The survey consists of 22 quas…
View article: Lyman Limit System with O vi in the Circumgalactic Environment of a Pair of Galaxies
Lyman Limit System with O vi in the Circumgalactic Environment of a Pair of Galaxies Open
We report on the analysis of a multiphase Lyman limit system (LLS) at z = 0.39047 identified toward the background quasar FBQS J0209–0438. The O VI doublet lines associated with this absorber have a different profile from the low-ionizatio…
View article: On the Nature of the C IV-bearing Circumgalactic Medium at z~1
On the Nature of the C IV-bearing Circumgalactic Medium at z~1 Open
This paper presents a detailed study of the physical properties of seven C IV absorbers identified at z_abs = 0.68-1.28 along the line of sight toward QSO PG 1522+101 (z_QSO = 1.330). The study leverages high-quality QSO spectra from HST C…
View article: MUSEQuBES: The kinematics of OVI-bearing gas in and around low-redshift galaxies
MUSEQuBES: The kinematics of OVI-bearing gas in and around low-redshift galaxies Open
We present a detailed study of the kinematics of OVI-bearing gas around 60 low-mass (median log(M*/Msun)~8.9) galaxies at low redshift (0.1 < z < 0.7) using background quasars (median impact parameter $\approx115$ kpc) as part of the MUSE …
View article: MUSEQuBES: The column density, covering fraction, and mass of OVI-bearing gas in and around low-redshift galaxies
MUSEQuBES: The column density, covering fraction, and mass of OVI-bearing gas in and around low-redshift galaxies Open
We present a study of OVI-bearing gas around 247 low-mass (median log(M*/Msun)~8.7) galaxies at low redshifts (0.1 < z < 0.7) using background quasars as part of the MUSE Quasar-fields Blind Emitters Survey (MUSEQuBES). We find that the av…
View article: Signatures of gas flows – I. Connecting the kinematics of the H <scp>i</scp> circumgalactic medium to galaxy rotation
Signatures of gas flows – I. Connecting the kinematics of the H <span>i</span> circumgalactic medium to galaxy rotation Open
The circumgalactic medium (CGM) hosts many physical processes with different kinematic signatures that affect galaxy evolution. We address the CGM–galaxy kinematic connection by quantifying the fraction of H i that is aligned with galaxy r…
View article: Discovery of Optically Emitting Circumgalactic Nebulae around the Majority of UV-luminous Quasars at Intermediate Redshift
Discovery of Optically Emitting Circumgalactic Nebulae around the Majority of UV-luminous Quasars at Intermediate Redshift Open
We report the discovery of large, ionized, [O ii ]-emitting circumgalactic nebulae around the majority of 30 UV-luminous quasars at z = 0.4–1.4 observed with deep, wide-field integral field spectroscopy with the Multi-Unit Spectroscopy Exp…
View article: Cloud-by-cloud multiphase investigation of the circumgalactic medium of low-redshift galaxies
Cloud-by-cloud multiphase investigation of the circumgalactic medium of low-redshift galaxies Open
The pervasive presence of warm gas in galaxy haloes suggests that the circumgalactic medium (CGM) is multiphase in its ionization structure and complex in its kinematics. Some recent state-of-the-art cosmological galaxy simulations predict…
View article: Discovery of optically emitting circumgalactic nebulae around the majority of UV-luminous quasars at intermediate redshift
Discovery of optically emitting circumgalactic nebulae around the majority of UV-luminous quasars at intermediate redshift Open
We report the discovery of large ionized, [O II] emitting circumgalactic nebulae around the majority of thirty UV luminous quasars at $z=0.4-1.4$ observed with deep, wide-field integral field spectroscopy (IFS) with the Multi-Unit Spectros…
View article: Cloud-by-cloud Multiphase Investigation of the Circumgalactic Medium of Low-redshift Galaxies
Cloud-by-cloud Multiphase Investigation of the Circumgalactic Medium of Low-redshift Galaxies Open
The pervasive presence of warm gas in galaxy halos suggests that the circumgalactic medium (CGM) is multiphase in its ionization structure and complex in its kinematics. Some recent state-of-the-art cosmological galaxy simulations predict …
View article: MUSEQuBES: mapping the distribution of neutral hydrogen around low-redshift galaxies
MUSEQuBES: mapping the distribution of neutral hydrogen around low-redshift galaxies Open
We present a detailed study of cool, neutral gas traced by Lyα around 4595 z < 0.5 galaxies using stacks of background quasar spectra. The galaxies are selected from our MUSEQuBES low-z survey along with data from the literature. These …
View article: The Relation between Galaxy ISM and Circumgalactic O vi Gas Kinematics Derived from Observations and ΛcDM Simulations
The Relation between Galaxy ISM and Circumgalactic O vi Gas Kinematics Derived from Observations and ΛcDM Simulations Open
We present the first galaxy-O vi absorption kinematic study for 20 absorption systems (EW > 0.1 å) associated with isolated galaxies (0.15 ≤ z ≤ 0.55) that have accurate redshifts and rotation curves obtained using Keck/ESI. Our sample is …
View article: The Impact of the Group Environment on the O VI Circumgalactic Medium
The Impact of the Group Environment on the O VI Circumgalactic Medium Open
We present a study comparing O vi λλ1031, 1037 doublet absorption found toward group galaxy environments to that of isolated galaxies. The O vi absorption in the circumgalactic medium (CGM) of isolated galaxies has been studied previously …
View article: Signatures of gas flows-I: Connecting the kinematics of the HI circumgalactic medium to galaxy rotation
Signatures of gas flows-I: Connecting the kinematics of the HI circumgalactic medium to galaxy rotation Open
The CGM hosts many physical processes with different kinematic signatures that affect galaxy evolution. We address the CGM-galaxy kinematic connection by quantifying the fraction of HI that is aligned with galaxy rotation with the equivale…
View article: Characterizing cool, neutral gas, and ionized metals in the outskirts of low-<i>z</i> galaxy clusters
Characterizing cool, neutral gas, and ionized metals in the outskirts of low-<i>z</i> galaxy clusters Open
We present the first detection of cool, neutral gas in the outskirts of low-z galaxy clusters using a statistically significant sample of 3191 z ≈ 0.2 background quasar-foreground cluster pairs by cross-matching the Hubble Spectroscopic Le…
View article: The first comprehensive study of a giant nebula around a radio-quiet quasar in the <i>z</i> &lt; 1 Universe
The first comprehensive study of a giant nebula around a radio-quiet quasar in the <i>z</i> < 1 Universe Open
We present the first comprehensive study of a giant, ≈70 kpc-scale nebula around a radio-quiet quasar at z < 1. The analysis is based on deep integral field spectroscopy with Multi-Unit Spectroscopic Explorer of the field of HE 0238−190…
View article: The first comprehensive study of a giant nebula around a radio-quiet quasar in the $z < 1$ Universe
The first comprehensive study of a giant nebula around a radio-quiet quasar in the $z < 1$ Universe Open
We present the first comprehensive study of a giant, $\approx \! \! 70$ kpc-scale nebula around a radio-quiet quasar at $z<1$. The analysis is based on deep integral field spectroscopy with MUSE of the field of HE$\,$0238$-$1904, a luminou…
View article: MUSEQuBES: the relation between Ly α emitters and C <scp>iv</scp> absorbers at <i>z</i> ≈ 3.3
MUSEQuBES: the relation between Ly α emitters and C <span>iv</span> absorbers at <i>z</i> ≈ 3.3 Open
We present a detailed study of the column density and covering fraction profiles of C iv absorption around 86 redshift z ≈ 3.3 Ly α emitters (LAEs) detected in eight Multi-Unit Spectroscopic Explorer (MUSE) fields of 1 arcmin × 1 arcmin ce…