A5089025019- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Astrophysics and Star Formation Studies
- Stellar, planetary, and galactic studies
- Gamma-ray bursts and supernovae
- Astronomical Observations and Instrumentation
- Radio Astronomy Observations and Technology
- Astrophysical Phenomena and Observations
- Astrophysics and Cosmic Phenomena
- Adaptive optics and wavefront sensing
- Spectroscopy and Laser Applications
- CCD and CMOS Imaging Sensors
- Dark Matter and Cosmic Phenomena
- Gaussian Processes and Bayesian Inference
- Scientific Computing and Data Management
- Scientific Research and Discoveries
- Particle Detector Development and Performance
- Plant Water Relations and Carbon Dynamics
- Advanced Vision and Imaging
- Species Distribution and Climate Change
- Superconducting and THz Device Technology
- Remote Sensing in Agriculture
- Advanced Optical Sensing Technologies
- Cosmology and Gravitation Theories
- Advanced Data Storage Technologies
University of Oxford
2015-2024
Institute of Medical Sciences
2021
Banaras Hindu University
2021
All India Institute of Medical Sciences Raipur
2019
Max Planck Society
2002-2015
Max Planck Institute for Radio Astronomy
2015
Max Planck Institute for Extraterrestrial Physics
2001-2007
Imperial College London
1997-2006
We present the Spectroscopic Imaging survey in near-infrared (near-IR) with SINFONI (SINS) of high-redshift galaxies. With 80 objects observed and 63 detected at least one rest-frame optical nebular emission line, mainly Hα, SINS represents largest spatially resolved gas kinematics, morphologies, physical properties star-forming galaxies z ∼ 1–3. describe selection targets, observations, data reduction. then focus on "SINS Hα sample," consisting 62 rest-UV/optically selected sources 1.3 <...
We present 0.5" resolution near-IR integral field spectroscopy of the Ha line emission 14 z~2 UV-selected BM/BX galaxies obtained with SINFONI at ESO/VLT. The mean half-light radius r_1/2 is about 4kpc and detected over > ~20kpc in several sources. In 9 sources, we detect spatially-resolved velocity gradients, from 40 to 410 km/s ~10kpc. observed kinematics larger systems are consistent orbital motions. Four well described by rotating disks clumpy morphologies extract rotation curves out...
The Herschel ATLAS is the largest open-time key project that will be carried out on Space Observatory. It survey 510 square degrees of extragalactic sky, four times larger than all other surveys combined, in five far-infrared and submillimetre bands. We describe survey, complementary multi-wavelength datasets combined with data, six major science programmes we are undertaking. Using new models based a previous galaxies, present predictions properties sources wavebands.
Mass outflows driven by stars and active galactic nuclei are a key element in many current models of galaxy evolution. They may produce the observed black hole-galaxy mass relation regulate quench both star formation host hole accretion. However, observational evidence such feedback processes through bulk forming molecular gas is still scarce. Here we report detection massive outflows, traced hydroxyl molecule (OH), far-infrared spectra ULIRGs obtained with Herschel-PACS as part SHINING...
Gravitational lensing is a powerful astrophysical and cosmological probe particularly valuable at submillimeter wavelengths for the study of statistical individual properties dusty starforming galaxies. However identification gravitational lenses often time-intensive, involving sifting large volumes imaging or spectroscopic data to find few candidates. We used early from Herschel Astrophysical Terahertz Large Area Survey demonstrate that wide-area surveys can simply easily detect strong...
We report the results from a systematic search for molecular (OH 119 μm) outflows with Herschel/PACS in sample of 43 nearby (z < 0.3) galaxy mergers, mostly ultraluminous infrared galaxies (ULIRGs) and QSOs. find that character OH feature (strength absorption relative to emission) correlates 9.7 μm silicate feature, measure obscuration ULIRGs. Unambiguous evidence outflows, based on detection profiles median velocities more blueshifted than −50 km s−1, is seen 26 (70%) 37 OH-detected...
We present a reduction and analysis of the \textit{James Webb Space Telescope} (JWST) SMACS~0723 field using new post-launch calibrations to conduct search for ultra-high-redshift galaxies ($z > 9$) within Epoch Reionisation. this by modelling photometric redshifts in several ways all sources applying conservative magnitude cuts ($m_{\rm F200W} < 28$) identify strong Lyman breaks greater than 1 magnitude. find four $z 9$ candidate which have not previously been identified, with one object at...
We present early results regarding the morphological and structural properties of galaxies seen with James Webb Space Telescope at $z > 3$ in Early Release Observations SMACS 0723, a galaxy cluster $z=0.39$. investigate, for first time, optical morphologies significant number accurate photometric redshifts this field to determine form structure relatively universe. use visual \textsc{Morfometryka} measures perform quantitative morphology measurements, both parametric light profile fitting...
Abstract We present results on the morphological and structural evolution of a total 3956 galaxies observed with JWST at 1.5 < z 6.5 in CEERS observations that overlap CANDELS EGS field. This is biggest visually classified sample yet, ∼20 times larger than previous studies, allows us to examine detail how galaxy structure has changed over this critical epoch. All sources were by six individual classifiers using simple classification scheme aimed producing disk/spheroid/peculiar...
In this first paper on the results of our Herschel PACS survey local Ultraluminous Infrared Galaxies (ULIRGs), as part SHINING galaxies, we present far-infrared spectroscopy Mrk 231, most luminous ULIRGs, and a type 1 broad absorption line AGN. For time in ULIRG, all observed fine-structure lines range were detected found to be deficient relative far infrared luminosity by - 2 orders magnitude compared with lower galaxies. The deficits are similar those for mid-infrared lines, showing high...
We report initial results from the far-infrared fine structure line observations of a sample 44 local starbursts, Seyfert galaxies and infrared luminous obtained with PACS spectrometer on board Herschel. show that ratio between luminosity molecular gas mass, Lfir/MH2, is much better proxy for relative brightness lines than Lfir alone. Galaxies high Lfir/MH2 ratios tend to have weaker their continuum < 80 Lsun/Msun. A deficit [C II] 158 micron was previously found ISO satellite, but now we...
We present medium resolution () ISO-SWS 2.4–45 μm spectra of a sample 29 galaxies with active nuclei. This data set is rich in fine structure emission lines tracing the narrow line regions and nuclear star formation regions, it provides coherent spectroscopic reference for future extragalactic studies mid-infrared. use to briefly discuss physical conditions (density, temperature, excitation, profiles) test possible differences between AGN sub-types. Our main focus on new tools determining...
Strong gravitational lenses are now being routinely discovered in wide-field surveys at (sub-)millimeter wavelengths. We present Submillimeter Array (SMA) high-spatial resolution imaging and Gemini-South Multiple Mirror Telescope optical spectroscopy of strong lens candidates the two widest extragalactic conducted by Herschel Space Observatory: Herschel-Astrophysical Terahertz Large Area Survey (H-ATLAS) Multi-tiered Extragalactic (HerMES). From a sample 30 sources with S500 > 100 mJy, 21...
We present the Spitzer Extragalactic Representative Volume Survey (SERVS), an 18 deg2 medium-deep survey at 3.6 and 4.5 μm with postcryogenic Space Telescope to ≈2 μJy (AB = 23.1) depth of five highly observed astronomical fields (ELAIS-N1, ELAIS-S1, Lockman Hole, Chandra Deep Field South, XMM-LSS). SERVS is designed enable study galaxy evolution as a function environment from z ∼ 5 day first extragalactic that both large enough deep put rare objects such luminous quasars clusters ≳ 1 into...
Full range Herschel/PACS spectroscopy of the (ultra)luminous infrared galaxies NGC 4418 and Arp 220, observed as part SHINING key programme, reveals high excitation in H2O, OH, HCN, NH3. In 4418, absorption lines were detected with Elower > 800 K (H2O), 600 (OH), 1075 (HCN), (NH3), while 220 is somewhat lower. While outflow signatures moderate are seen have been previous studies, tracing its outer regions redshifted relative to nucleus, suggesting an inflow Ṁ ≲ 12 M⊙ yr-1. Both compact warm...
We present Herschel observations of 6 fine-structure lines in 25 ultraluminous infrared galaxies at z < 0.27. The lines, [O iii]52 μm, [N iii]57 i]63 ii]122 i]145 and [C ii]158 are mostly single Gaussians with widths <600 km s−1 luminosities 107–109 L☉. There deficits the i]63/LIR, ii]/LIR, i]145/LIR, ii]/LIR ratios compared to lower luminosity systems. majority line consistent dustier H ii regions, but part ii] deficit may arise from an additional mechanism, plausibly charged dust grains....
We report on our observations of the 79 and 119um doublet transitions OH for 24 local (z<0.262) ULIRGs observed with Herschel-PACS as part Herschel ULIRG Survey (HERUS). Some OH119 profiles display a clear P-Cygni shape therefore imply outflowing gas, other are predominantly in absorption or completely emission. find that relative strength emission component decreases silicate increases. This locates outflows inside obscured nuclei. The maximum outflow velocities sources range from less than...
We present a pan-chromatic analysis of an unprecedented sample 1402 250 micron-selected galaxies at z < 0.5 (mean = 0.24) from the Herschel-ATLAS survey. complement our Herschel 100-500 micron data with UV-K-band photometry Galaxy And Mass Assembly (GAMA) survey and apply MAGPHYS energy-balance technique to produce SEDs for representative selected spanning most recent 5 Gyr cosmic history. derive estimates physical parameters, including star formation rates, stellar masses, dust masses...
The SHINING survey (Paper I; Herrera-Camus et al. 2018) offers a great opportunity to study the properties of ionized and neutral media galaxies from prototypical starbursts active galactic nuclei (AGN) heavily obscured objects. Based on Herschel/PACS observations main far-infrared (FIR) fine-structure lines, in this paper we analyze physical mechanisms behind observed line deficits galaxies, apparent offset luminous infrared (LIRGs) mass-metallicity relation, scaling relations between [CII]...
We describe Space Warps, a novel gravitational lens discovery service that yields samples of high purity and completeness through crowd-sourced visual inspection. Carefully produced colour composite images are displayed to volunteers via web- based classification interface, which records their estimates the positions candidate lensed features. Images simulated lenses, as well real lack inserted into image stream at random intervals; this training set is used give instantaneous feedback on...
We report the discovery of 29 promising (and 59 total) new lens candidates from Canada–France–Hawaii Telescope Legacy Survey (CFHTLS) based on about 11 million classifications performed by citizen scientists as part first Space Warps search. The goal blind search was to identify missed robots (the ringfinder galaxy scales and arcfinder group/cluster scales) which had been previously used mine CFHTLS for lenses. compare some properties samples detected these algorithms sample find them be...
Vera C. Rubin Observatory is a ground-based astronomical facility under construction, joint project of the National Science Foundation and U.S. Department Energy, designed to conduct multi-purpose 10-year optical survey southern hemisphere sky: Legacy Survey Space Time. Significant flexibility in strategy remains within constraints imposed by core science goals probing dark energy matter, cataloging Solar System, exploring transient sky, mapping Milky Way. The survey's massive data...
We analyse the photometric and spectroscopic properties of four galaxies in epoch reionisation (EoR) within SMACS 0723 JWST Early Release Observations field. Given known redshifts these sources, we investigated accuracy with which can be derived using NIRCam photometry alone, finding that F115W imaging is essential to distinguish between z~8 high equivalent width (EW) [O III] {\lambda}5007 emission z~10 Balmer break galaxies. find all sources exhibit strong (\geq 0.6 mag) F356W-F444W...