A5020335855- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Astrophysical Phenomena and Observations
- Astrophysics and Star Formation Studies
- Gamma-ray bursts and supernovae
- Astronomical Observations and Instrumentation
- Astrophysics and Cosmic Phenomena
- Adaptive optics and wavefront sensing
- Cosmology and Gravitation Theories
- Radio Astronomy Observations and Technology
- Spectroscopy and Laser Applications
- CCD and CMOS Imaging Sensors
- Scientific Research and Discoveries
- Calibration and Measurement Techniques
- Pulsars and Gravitational Waves Research
- Astro and Planetary Science
- Solar and Space Plasma Dynamics
- Geophysics and Gravity Measurements
- Advanced X-ray Imaging Techniques
- X-ray Spectroscopy and Fluorescence Analysis
- History and Developments in Astronomy
- Atmospheric Ozone and Climate
- Scientific Measurement and Uncertainty Evaluation
- Phase Equilibria and Thermodynamics
University of Cambridge
2016-2025
University College London
2020-2025
ACT Government
2024
Mount Stromlo Observatory
2024
ASTRO-3D
2023
ARC Centre of Excellence for All-sky Astrophysics
2023
Cavendish Hospital
2003-2022
University of Wisconsin–Madison
2022
Instituto de Astrofísica de Canarias
2020
Arcetri Astrophysical Observatory
2000-2018
We quantify the importance of mass accretion during active galactic nuclei (AGN) phases in growth supermassive black holes (BHs) by comparing function Local Universe with that expected from AGN relics, which are grown entirely phases. The local BH (BHMF) is estimated applying well-known correlations between mass, bulge luminosity and stellar velocity dispersion to galaxy functions. find different provide same BHMF only if they have intrinsic dispersion. density we estimate ρBH=...
We show that the mass-metallicity relation observed in local universe is due to a more general between stellar mass M*, gas-phase metallicity and SFR. Local galaxies define tight surface this 3D space, Fundamental Metallicity Relation (FMR), with small residual dispersion of ~0.05 dex metallicity, i.e, ~12%. At low mass, decreases sharply increasing SFR, while at high does not depend on High redshift galaxies, up z~2.5 are found follow same FMR defined by SDSS no indication evolution. The...
We present an overview of a new integral field spectroscopic survey called MaNGA (Mapping Nearby Galaxies at Apache Point Observatory), one three core programs in the fourth-generation Sloan Digital Sky Survey (SDSS-IV) that began on 2014 July 1. will investigate internal kinematic structure and composition gas stars unprecedented sample 10,000 nearby galaxies. summarize essential characteristics instrument design context MaNGA's key science goals prototype observations to demonstrate...
Two main modes of star formation are know to control the growth galaxies: a relatively steady one in disk-like galaxies, defining tight rate (SFR)–stellar mass sequence, and starburst mode outliers such sequence which is generally interpreted as driven by merging. Such galaxies rare but have much higher SFRs, it interest establish relative importance these two modes. PACS/Herschel observations over whole COSMOS GOODS-South fields, conjunction with previous optical/near-IR data, allowed us...
We present initial results of an ESO-VLT large programme (AMAZE) aimed at determining the evolution mass-metallicity relation z>3 by means deep near-IR spectroscopy. Gas metallicities are measured, for sample nine star forming galaxies z~3.5, optical nebular lines redshifted into near-IR. Stellar masses accurately determined using Spitzer-IRAC data, which rest-frame stellar light in these distant galaxies. When compared with previous surveys, inferred z~3.5 shows much stronger than observed...
We study the properties of massive, galactic-scale outflows molecular gas and investigate their impact on galaxy evolution. present new IRAM PdBI CO(1-0) observations local ULIRGs QSO hosts: clear signature massive energetic outflows, extending kpc scales, is found in kinematics four out seven sources, with measured outflow rates several 100 Msun/yr. combine these data from literature, explore nature origin within an extended sample 19 galaxies. find that starburst-dominated galaxies have...
We use hard X-ray data for an "optimal" sample of Seyfert 2 galaxies to derive the distribution gaseous absorbing column densities among obscured active nuclei in local universe. Of all sample, 75% are heavily (NH > 1023 cm-2), and about half Compton thick 1024 cm-2). Intermediate type 1.8-1.9 characterized by average NH much lower than "strict" galaxies. No correlation is found between intrinsic luminosity nuclear source. This has important consequences synthesis cosmic background. In...
We compute the rate of supernovae (SNe) different types along Hubble sequence normalized to near-infrared luminosity and stellar mass parent galaxies. This is made possible by new complete catalog galaxy magnitudes obtained 2MASS. find that rates all SN types, including Ia, Ib/c II, show a sharp dependence on both morphology () colors galaxies and, therefore, star formation activity. In particular we find, with high statistical significance, type Ia in late factor ~20 higher than E/S0....
Feedback from accreting SMBHs is often identified as the main mechanism responsible for regulating star-formation in AGN host galaxies. However, relationships between activity, radiation, winds, and are complex still far being understood. We study scaling relations properties, galaxy properties winds. then evaluate wind mean impact on global history, taking into account short duty cycle with respect to that of star-formation. first collect observations 94 detected massive winds at sub-pc kpc...
We present and discuss a "3-dimensional" diagnostic diagram for Seyfert2 galaxies obtained by means of X-ray [OIII] data on large sample objects (reported in the Appendix). The shows Kalpha iron line equivalent width as function both column density derived from photoelectric cutoff 2-10 keV flux normalized to optical (the latter corrected extinction assumed be true indicator source intrinsic luminosity). find that hard properties type 2 depend single parameter, absorbing along sight,in...
In the standard scenario for galaxy evolution young star-forming galaxies transform into red bulge-dominated spheroids, where star formation has been quenched. To explain this transformation, a strong negative feedback generated by accretion onto central super-massive black hole is often invoked. The depletion of gas resulting from quasar-driven outflows should eventually stop star-formation across host and lead to “suicide” starvation. Direct observational evidence major quasar still...
We exploit the deep and extended far infrared data sets (at 70, 100 160 um) of Herschel GTO PACS Evolutionary Probe (PEP) Survey, in combination with HERschel Multi tiered Extragalactic Survey (HerMES) at 250, 350 500 um, to derive evolution restframe 35 60 90 total (IR) luminosity functions (LFs) up z~4. detect very strong for IR LF combined a density evolution. In agreement previous findings, increases steeply z~1, then flattens between z~1 z~3 decrease z greater than 3. Galaxies different...
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...
Most theoretical models invoke quasar driven outflows to quench star formation in massive galaxies, this feedback mechanism is required account for the population of old and passive galaxies observed local universe. The discovery massive, at z=2, implies that such onto host galaxy must have been work very early on, close reionization epoch. We [CII]158um transition SDSSJ114816.64+525150.3 that, z=6.4189, one most distant quasars known. detect broad wings line tracing a quasar-driven outflow....
Bolometric luminosities and Eddington ratios of both X-ray selected broad-line (Type-1) narrow-line (Type-2) AGN from the XMM-Newton survey in COSMOS field are presented. The sample is composed by 929 (382 Type-1 547 Type-2 AGN) it covers a wide range redshifts, absorbing column densities. About 65% sources spectroscopically identified as either or (83% 52% respectively), while accurate photometric redshifts available for rest sample. study such large with high quality multi-wavelength...
Modern (sub-)millimeter interferometers enable the measurement of cool gas and dust emission high-redshift galaxies (z>5). However, at these redshifts cosmic microwave background (CMB) temperature is higher, approaching, even exceeding, cold molecular observed in local Universe. In this paper, we discuss impact warmer CMB on observations galaxies. The affects continuum line (e.g. carbon monoxide, CO) two ways: (i) it provides an additional source (both gas) heating; (ii) a non-negligible...
We present the first results of a project, LSD, aimed at obtaining spatially-resolved, near-infrared spectroscopy complete sample Lyman-Break Galaxies z~3. Deep observations with adaptive optics resulted in detection main optical lines, such as [OII], Hbeta and [OIII], which are used to study sizes, SFRs, morphologies, gas-phase metallicities, gas fractions effective yields. Optical, near-IR Spitzer/IRAC photometry is measure stellar mass. obtain that morphologies usually complex, presence...
Deep far-infrared photometric surveys studying galaxy evolution and the nature of cosmic infrared background are a key strength Herschel mission. We describe scientific motivation for PACS Evolutionary Probe (PEP) guaranteed time program its role in complement surveys, field selection which includes popular multiwavelength fields such as GOODS, COSMOS, Lockman Hole, ECDFS, EGS. provide an account observing strategies data reduction methods used. An overview first science results illustrates...
We provide an overview of the design and capabilities near-infrared spectrograph (NIRSpec) onboard James Webb Space Telescope. NIRSpec is designed to be capable carrying out low-resolution ($R\!=30\!-330$) prism spectroscopy over wavelength range $0.6-5.3\!~\mu$m higher resolution ($R\!=500\!-1340$ or $R\!=1320\!-3600$) grating $0.7-5.2\!~\mu$m, both in single-object mode employing any one five fixed slits, a 3.1$\times$3.2 arcsec$^2$ integral field unit, multiobject novel programmable...
We outline the experimental concept and key scientific capabilities of AION (Atom Interferometer Observatory Network), a proposed programme using cold strontium atoms to search for ultra-light dark matter, explore gravitational waves in mid-frequency range between peak sensitivities LISA LIGO/Virgo/ KAGRA/INDIGO/Einstein Telescope/Cosmic Explorer experiments, probe other frontiers fundamental physics. would complement planned searches as well mergers involving intermediate-mass black holes...
We study the spatially resolved excitation properties of ionised gas in a sample 646 galaxies using integral field spectroscopy data from SDSS-IV MaNGA. Making use Baldwin-Philips-Terlevich diagnostic diagrams we demonstrate ubiquitous presence extended (kpc scale) low ionisation emission-line regions (LIERs) both star forming and quiescent galaxies. In LIER emission can be associated with diffuse gas, most evident as extra-planar edge-on systems. addition, identify two main classes...
Most galaxy evolutionary models require quasar feedback to regulate star formation in their host galaxies. In particular, at high redshift, expect that associated with quasar-driven outflows is so efficient the gas largely swept away or heated up, hence suppressing massive We observationally investigate this phenomenon by using VLT-SINFONI integral field spectroscopy of luminous 2QZJ002830.4-281706 z = 2.4. The spectra sample optical emission lines redshifted into near-IR. [OIII]λ5007...
We compare multi-wavelength SFR indicators out to z~3 in GOODS-South. Our analysis uniquely combines U-to-8um photometry from FIREWORKS, MIPS 24um and PACS 70, 100, 160um the PEP survey, Ha spectroscopy SINS survey. describe a set of conversions that lead continuity across indicators. A luminosity-independent conversion total infrared luminosity yields estimates LIR are median consistent with derived photometry, albeit significant scatter. Dust correction methods perform well at low...
We present results from the deepest Herschel-PACS (Photodetector Array Camera and Spectrometer) far-infrared blank field extragalactic survey, obtained by combining observations of GOODS (Great Observatories Origins Deep Survey) fields PACS Evolutionary Probe (PEP) GOODS-Herschel key programmes. describe data reduction construction images catalogues. In parts GOODS-S field, catalogues reach 3-sigma depths 0.9, 0.6 1.3 mJy at 70, 100 160 um, respectively, resolve ~75% cosmic infrared...