A5070595467- Galaxies: Formation, Evolution, Phenomena
- Astrophysics and Star Formation Studies
- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Astrophysics and Cosmic Phenomena
- Astrophysical Phenomena and Observations
- Gamma-ray bursts and supernovae
- Astronomical Observations and Instrumentation
- Radio Astronomy Observations and Technology
- Adaptive optics and wavefront sensing
- Geophysics and Gravity Measurements
- Scientific Research and Discoveries
- Plant Water Relations and Carbon Dynamics
- Spectroscopy and Laser Applications
- Cosmology and Gravitation Theories
- Impact of Light on Environment and Health
- Dark Matter and Cosmic Phenomena
- Calibration and Measurement Techniques
- Particle physics theoretical and experimental studies
- Remote Sensing in Agriculture
- Iterative Methods for Nonlinear Equations
- Advanced Image Processing Techniques
- Black Holes and Theoretical Physics
- Diamond and Carbon-based Materials Research
- Geodetic Measurements and Engineering Structures
Inter-University Centre for Astronomy and Astrophysics
2010-2024
ORCID
2024
Leibniz Institute for Astrophysics Potsdam
2019-2023
Savitribai Phule Pune University
2021
University of Potsdam
2021
Leiden University
2016-2020
Leiden Observatory
2016-2020
Pennsylvania State University
2014-2019
We use the MusE GAs FLOw and Wind (MEGAFLOW) survey to study kinematics of extended disk-like structures cold gas around $z\approx1$ star-forming galaxies. The combination VLT/MUSE VLT/UVES observations allows us connect measured through MgII quasar absorption spectroscopy orientation associated galaxies constrained integral field spectroscopy. Confirming previous results, we find that galaxy-absorber pairs MEGAFLOW follow a strong bimodal distribution, consistent with picture being...
We present results from our on-going MusE GAs FLOw and Wind (MEGAFLOW) survey, which consists of 22 quasar lines-of-sight, each observed with the integral field unit (IFU) MUSE UVES spectrograph at ESO Very Large Telescopes (VLT). The goals this survey are to study properties circum-galactic medium around $z\sim1$ star-forming galaxies. absorption-line selected 79 strong \MgII\ absorbers (with rest-frame equivalent width (REW)$\gtrsim$0.3\AA) and, currently, 86 associated galaxies within 100...
We present the design, rationale, properties, and catalogues of MusE Gas FLOw Wind survey (MEGAFLOW) cool gaseous halos z≃1.0 galaxies, using low-ionisation absorption systems. The consists 22 quasar fields selected from Sloan Digital Sky Survey (SDSS), including multiple (≥3) strong lines over redshift range $0.3<z<1.5$. Each was observed with Multi-Unit Spectroscopic Explorer (MUSE) Ultraviolet Visual Echelle Spectrograph (UVES), for a total 85 hours 63 hours, respectively. UVES data...
Abstract 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 low density, the direct detection diffuse gas in filaments remains elusive. Here, we report discovery an extremely metal-poor ([ X / H ] ≈ −3.7), low-density ( <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:msub> <mml:mrow> <mml:mi>log</mml:mi>...
We report a bimodality in the azimuthal angle ($\Phi$) distribution of gas around galaxies traced by OVI absorption. present mean $\Phi$ probability function 29 HST-imaged absorbing (EW>0.1A) and 24~non-absorbing (EW<0.1A) isolated (0.08<z<0.67) within 200kpc background quasars. show that EW is anti-correlated with impact parameter covering fraction decreases from 80% 50kpc to 33% at 200kpc. The presence absorption azimuthally dependent occurs between $\pm10-20^{\circ}$ galaxy projected...
We present a detailed analysis of large-scale galactic outflow in the CGM massive (M_h ~ 10^12.5 Msun), star-forming (6.9 Msun/yr), sub-L* (0.5 L_B*) galaxy at z=0.39853 that exhibits wealth metal-line absorption spectra background quasar Q 0122-003 an impact parameter 163 kpc. The inclination angle (i=63 degree) and azimuthal (Phi=73 imply QSO sightline is passing through projected minor-axis galaxy. system shows multiphase, multicomponent structure with ultra-strong, wide velocity spread...
ABSTRACT Ly α emission lines are typically found to be redshifted with respect the systemic redshifts of galaxies, likely due resonant scattering photons. Here, we measure average velocity offset for a sample 96 z ≈ 3.3 emitters (LAEs) median flux (luminosity) ${\approx}10^{-17}~\rm erg~cm^{-2}~s^{-1}$ (${\approx}10^{42}~\rm erg~s^{-1}$) and star formation rate (SFR) ≈1.3 $\rm M_{\odot }~yr^{-1}$ (not corrected possible dust extinction), detected by Multi-Unit Spectroscopic Explorer as part...
Using deep (11.2hr) VLT/MUSE data from the MEGAFLOW survey, we report first detection of extended MgII emission a galaxy's halo that is probed by quasar sightline. The $\lambda\lambda$ 2796,2803 around $z = 0.702$ galaxy ($\log(M_*/\mathrm{M_\odot}) 10.05^{+0.15}_{-0.11}$) detected out to $\approx$25 kpc central and covers $1.0\times10^3$ kpc$^2$ above surface brightness $14\times10^{-19} \mathrm{erg} \mathrm{s}^{-1} \mathrm{cm}^{-2}\,\mathrm{arcsec}^{-2}$ ($2 \sigma$; integrated over 1200...
ABSTRACT We present a detailed study of cool, neutral gas traced by Lyα around 4595 z &lt; 0.5 galaxies using stacks background quasar spectra. The are selected from our MUSEQuBES low-z survey along with data the literature. These galaxies, median stellar mass ${\rm log}_{10}(M_*/\rm {\rm M}_{\odot })$ =10.0, probed 184 quasars giving rise to 5054 quasar-galaxy pairs. impact parameter is b = 1.5 pMpc (median b/Rvir 10.4) 204 (419) pairs probing 1(2). find excess absorption out at least...
ABSTRACT The pervasive presence of warm gas in galaxy haloes suggests that the circumgalactic medium (CGM) is multiphase its ionization structure and complex kinematics. Some recent state-of-the-art cosmological simulations predict an azimuthal dependence CGM metallicities. We investigate such a trend by analysing distribution properties around 47 z &lt; 0.7 galaxies from Multiphase Galaxy Halos Survey determined using cloud-by-cloud, multiphase, modelling approach. identify three...
Using the exquisite data from MUSE eXtremely Deep Field (MXDF), we report discovery of an Mg II emission nebula with area above a 2 σ significance level 1000 proper kpc . This provides first panoramic view spatial distribution magnesium in intragroup medium low-mass group five star-forming galaxies at z = 1.31. The galaxy members are separated by less than 50 physical projection and ≈120 km s −1 velocity space. most massive has stellar mass 10 9.35 M ⊙ shows P-Cygni line profile, indicating...
The bimodal absorption system imaging campaign (BASIC) aims to characterize the galaxy environments of a sample 36 HI-selected partial Lyman limit systems (pLLSs) and (LLSs) in 23 QSO fields at $z \lesssim 1$. These pLLSs/LLSs provide unique absorbers with unbiased well-constrained metallicities, allowing us explore origins metal-rich low-metallicity circumgalactic medium (CGM) $z<1$. Here we present Keck/KCWI VLT/MUSE observations 11 these (19 pLLSs) that combine HST/ACS identify...
Recent theoretical models suggest that the early phase of galaxy formation could involve an epoch when galaxies are gas-rich but inefficient at forming stars: a "dark galaxy" phase. Here, we report results our MUSE (Multi Unit Spectroscopic Explorer) survey for dark fluorescently illuminated by quasars $z>3$. Compared to previous studies which based on deep narrow-band (NB) imaging, integral field provides nearly uniform sensitivity coverage over large volume in redshift space around as well...
Context. The Milky Way is surrounded by large amounts of diffuse gaseous matter that connects the stellar body our Galaxy with its large-scale Local Group (LG) environment.
Abstract Using an ultra-deep blind survey with the MUSE integral field spectrograph on European Southern Observatory Very Large Telescope, we obtain spectroscopic redshifts to a depth never before explored: galaxies observed magnitudes m AB ≳ 30–32. Specifically, detect objects via Ly α emission at 2.9 < z 6.7 without individual continuum counterparts in areas covered by deepest optical/near-infrared imaging taken Hubble Space Telescope , Ultra Deep Field. In total, find 102 such 9 square...
Abstract We present interstellar matter (ISM) and circumgalactic medium (CGM) metallicities for 25 absorption systems associated with isolated star-forming galaxies ( <?CDATA $\left\langle z\right\rangle =0.28$?> ) 9.4 ≤ log( M * / ⊙ 10.9 detected within (200 kpc). Galaxy ISM were measured using H α /[N ii ] emission lines from Keck/ESI spectra. CGM single-phase low-ionization modeled Markov Chain Monte Carlo Cloudy analysis of HST /COS Keck/HIRES or VLT/UVES quasar find that the galaxy...
We present an analysis of HI Lyman-alpha emission in deep VLT/MUSE observations two highly magnified and extended galaxies at z=3.5 4.03, including a newly discovered, almost complete Einstein ring. While these haloes are intrinsically similar to the ones typically seen other MUSE fields, benefits gravitational lensing allows us construct exceptionally detailed maps line properties sub-kpc scales. By combining all multiple images, we able observe complex structures uncover small (~ 120 km/s...
Abstract The relationship between galaxies and the state/chemical enrichment of warm–hot intergalactic medium (WHIM) expected to dominate baryon budget at low- z provides sensitive constraints on structure formation galaxy evolution models. We present a deep redshift survey in field 1ES1553+113, blazar with unique combination ultraviolet (UV)+X-ray spectra for surveys circumgalactic/intergalactic (CGM/IGM). Nicastro et al. reported detection two O vii WHIM absorbers = 0.4339 0.3551 its...
Abstract We report the discovery of large, ionized, [O ii ]-emitting circumgalactic nebulae around majority 30 UV-luminous quasars at z = 0.4–1.4 observed with deep, wide-field integral field spectroscopy Multi-Unit Spectroscopy Explorer (MUSE) by Cosmic Ultraviolet Baryon Survey and MUSE Quasar Blind Emitters Survey. Among quasars, seven (23%) exhibit major axis sizes greater than 100 kpc, 20 50 kpc (67%), 27 (90%) kpc. Such optically emitting indicate that cool, dense, metal-enriched gas...
We present the results of a systematic search for molecular hydrogen (H2) in low redshift ($ 0.05 \lesssim z 0.7$) DLAs and sub-DLAs with $N(HI) \gtrsim 10^{19.0}$ cm$^{-2}$, archival HST/COS spectra. Our core sample is comprised 27 systems median $\log N(HI) = 19.6$. On average, our survey sensitive down to N(H2) 14.4$ corresponding fraction f_{H2} -4.9$ at $N(HI)$. H2 detected 10 cases (3/5 7/22 sub-DLAs) this $f_{H2}$ limit. The detection rate $50^{+25}_{-12}$ percent seen sample, factor...
We present a study comparing OVI $\lambda\lambda$1031, 1037 doublet absorption found towards group galaxy environments with that of isolated galaxies. The in the circumgalactic medium (CGM) galaxies has been studied previously by "Multiphase Galaxy Halos" survey, where kinematics and properties CGM have investigated. extend these studies to environments. define two or more having line-of-sight velocity difference no than 1000 km/s located within 350 kpc (projected) background quasar...
We present a sample of 34 weak metal line absorbers at $z< 0.3$ complied via the simultaneous detections ($3σ$) SiII$\lambda1260$ and CII$\lambda1334$ absorption lines, with $W_{r}$(SiII)$<0.2$ Å $W_{r}$(CII)$<0.3$ Å, in archival HST/COS spectra. Our increases number known low-$z$ "weak absorbers" by factor $>5$. The column densities HI low-ionization lines obtained from Voigt profile fitting are used to build simple photoionization models using CLOUDY. inferred total hydrogen...
ABSTRACT Lyman- and Werner-band absorption of molecular hydrogen ( <?CDATA ${{\rm{H}}}_{2}$?> ) is detected in ∼50% low-redshift $z\lt 1$?> DLAs/sub-DLAs with $N$?> $\gt \;{10}^{14.4}$?> cm −2 . However, the true origin(s) -bearing gas remain elusive. Here we report a new detection an absorber at ${z}_{{\rm{abs}}}$?> = 0.4298 Hubble Space Telescope HST )/Cosmic Origins Spectrograph spectra quasar PKS 2128–123. The total $N({\rm{H}}\;{\rm{i}})$?> ${10}^{19.50\pm 0.15}$?> classifies as...
ABSTRACT We present the first characterization of circumgalactic medium Ly α emitters (LAEs), using a sample 96 z ≈ 3.3 LAEs detected with VLT/MUSE in fields centred on eight bright background quasars. The have low luminosities ($\sim 10^{42}\, \text{erg}\, \text{s}^{-1}$) and star formation rates (SFRs) $\sim 1~\text{M}_\odot \, \text{yr}^{-1}$, which for main-sequence galaxies correspond to stellar masses only 10^{8.6}\, \text{M}_\odot$. median transverse distance between quasar sightlines...
Abstract We report the discovery of giant (50−100 kpc) [O ii ] emitting nebulae with MUSE in field TXS 0206−048, a luminous quasar at z = 1.13. “Down-the-barrel” UV spectra show absorption velocities coincident those extended nebulae, enabling new insights into inflows and outflows around host. One nebula exhibits filamentary morphology extending over 120 kpc from halo toward intersecting another surrounding host radius 50 kpc. This is longest cool filament observed to date arises higher...