A5039377338- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Astrophysics and Star Formation Studies
- Stellar, planetary, and galactic studies
- Spectroscopy and Laser Applications
- Superconducting and THz Device Technology
- Astronomical Observations and Instrumentation
- Astrophysical Phenomena and Observations
- Radio Astronomy Observations and Technology
- Scientific Research and Discoveries
- Calibration and Measurement Techniques
- Adaptive optics and wavefront sensing
- Cosmology and Gravitation Theories
- Astrophysics and Cosmic Phenomena
- Cardiac Imaging and Diagnostics
- History and Developments in Astronomy
- Medical Imaging Techniques and Applications
- Gamma-ray bursts and supernovae
- Atomic and Subatomic Physics Research
- Spacecraft Design and Technology
- Historical Astronomy and Related Studies
- Particle Accelerators and Free-Electron Lasers
- Optical Coatings and Gratings
- Atmospheric Ozone and Climate
- Hormonal Regulation and Hypertension
Winona State University
2017-2024
Max Planck Society
2015-2019
Max Planck Institute for Astronomy
2014-2019
Cornell University
2010-2015
Max Planck Institute for Radio Astronomy
2015
We have detected the 158 {\mu}m [CII] line from 12 galaxies at z~1-2. This is first survey of this important starformation tracer redshifts covering epoch maximum star-formation in Universe and quadruples number reported high z detections. The very luminous, between <0.024-0.65% far-infrared continuum luminosity our sources, arises PDRs on molecular cloud surfaces. An exception PKS 0215+015, where half emission could arise XDRs near central AGN. L[CII] /LFIR ratio star-formation-dominated...
Abstract We present ALMA band 3 observations of the CO(6–5), CO(7–6), and [C i ] 369 μ m emission lines in three highest-redshift quasar host galaxies at <?CDATA $6.6\lt z\lt 6.9$?> . These measurements constitute CO detections to date. The target quasars have previously been detected ii 158 underlying FIR dust continuum. detect (spatially unresolved, a resolution >2″, or ≳14 kpc) all hosts. In two sources, we continuum around 400 (rest-frame), one source low significance. derive...
Far-infrared astronomy has advanced rapidly since its inception in the late 1950's, driven by a maturing technology base and an expanding community of researchers. This advancement shown that observations at far-infrared wavelengths are important nearly all areas astrophysics, from search for habitable planets origin life, to earliest stages galaxy assembly first few hundred million years cosmic history. The combination still developing portfolio technologies, particularly field detectors,...
We investigate the molecular gas content of z~6 quasar host galaxies using IRAM / Northern Extended Millimeter Array. target 3mm dust continuum, and line emission from CO(6-5), CO(7-6), [CI]2-1 in 10 infra-red-luminous quasars that have been previously studied their 1mm continuum [CII] emission. detect CO(7-6) at various degrees significance all targeted sources, thus doubling number such detections quasars. The to flux density ratios are consistent with a modified black body spectrum...
We study the properties of interstellar medium in interacting system BR1202-0725 at z=4.7 via its [NII] and [CII] fine-structure line emission. This consists a QSO, sub-mm galaxy (SMG), two Ly-alpha emitters (LAEs). Such diversity makes unique laboratory star formation evolution high redshift. present ionized nitrogen ([NII] 205 micron) observations this system, obtained with IRAM Plateau de Bure Interferometer. find no emission quasar location, but tentative detections associated SMG one...
We have recently detected the [CII] 157.7 micron line in eight star forming galaxies at redshifts 1 to 2 using redshift(z) Early Universe Spectrometer (ZEUS). Our sample targets formation dominant sources PAH emission. This represents a significant addition observations during epoch of peak formation. augmented this survey with [OI] 63 and far infrared photometry from PACS SPIRE Herschel instruments as well Spitzer IRS spectra literature showing features. exhibit above average gas heating...
We have made the first detections of 88 μm [O iii] line from galaxies in early universe, detecting lensed active galactic nucleus (AGN)/starburst composite systems APM 08279+5255 at z = 3.911 and SMM J02399–0136 2.8076. The is exceptionally bright both systems, with apparent (lensed) luminosities ∼1011 L☉. For 08279, flux can be modeled a star formation paradigm, stellar radiation field dominated by stars effective temperatures, Teff > 36,000 K, similar to starburst found M82. model implies...
We report the first detections of [NII] 122 {\mu}m line from a high redshift galaxy. The was strongly (> 6{\sigma}) detected SMMJ02399-0136, and H1413+117 (the Cloverleaf QSO) using Redshift(z) Early Universe Spectrometer (ZEUS) on CSO. lines both sources are quite bright with line-to-FIR continuum luminosity ratios that ~7.0\times10^{-4} (Cloverleaf) 2.1\times10^{-3} (SMMJ02399). With 2-10 times larger than average value for nearby galaxies, neither source exhibits line-to-continuum...
We report the discovery of two companion sources to a strongly lensed galaxy SPT0418-47 ("ring") at redshift 4.225, targeted by JWST Early Release Science program. confirm that these are similar as ring based on H$\alpha$ detected in NIRSpec spectrum, and [C II] 158 $\mu$m line from ALMA. Using multiple spectral lines JWST/NIRSpec, rest-frame optical infrared images NIRCam MIRI, far-infrared (FIR) dust continuum ALMA, we argue newly discovered actually same galaxy, hereafter referred...
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...
The circumgalactic medium (CGM) plays a vital role in galaxy evolution, however, studying the emission from CGM is challenging due to its low surface brightness and complexities involved interpreting resonant lines such as Lyman-alpha ( near-infrared coverage, unprecedented sensitivity, high spatial resolution of James Webb Space Telescope (JWST) enable us study optical strong associated with extended ``nebulae'' at redshifts 2--3. These serve diagnostic tools infer physical conditions...
We present NII 205 μm fine structure line observations of three submillimeter galaxies (SMGs) and quasar host (QSOs) at 4lesssimzlesssim6 using the Institut de radioastronomie millim'etrique (IRAM) interferometer. The emission is detected in sources, we report detections underlying dust continuum all sources. observed -to-infrared luminosity ratio spans least 0.5 dex for our Comparing estimates with sources similar redshifts shows that overall -to-IR over 1 magnitude from L_ /L_IR ∼ 10^-4 --...
We present Atacama Large Millimeter Array (ALMA) observations of two high-redshift systems (SMMJ02399-0136 and the Cloverleaf QSO) in their rest-frame 122 micron continuum (~650 GHz or ~450 on-sky) [NII] line emission. The with a synthesized beam ~0.25" resolve both sources recover expected flux. is resolved into partial Einstein ring, while SMMJ02399-0136 unambiguously separated components; an AGN associated point source extend region at location previously identified dusty starburst....
We present ALMA band 8 observations of the [OIII] 88um line and underlying thermal infrared continuum emission in z=6.08 quasar CFHQS J2100-1715 its dust-obscured starburst companion galaxy (projected distance: ~60 kpc). Each hosts star formation at rates > 100 M_sun/yr, but only shows evidence for an accreting 10^9 M_sun black hole. Therefore we can compare properties interstellar medium distinct galactic environments two physically associated objects, ~1 Gyr after Big Bang. Bright from...
We recently commissioned our new spectrometer, the second-generation z(Redshift) and Early Universe Spectrometer (ZEUS-2) on Atacama Pathfinder Experiment telescope. ZEUS-2 is a submillimeter grating spectrometer optimized for detecting faint broad lines from distant galaxies that are redshifted into telluric windows 200 to 850 μm. It uses focal plane array of transition-edge sensed bolometers, first use these arrays astrophysical spectroscopy. promises be an important tool studying in years...
Abstract We investigate the properties of interstellar medium, star formation, and current-day stellar population in strongly lensed star-forming galaxy H-ATLAS J091043.1-000321 (SDP.11), at z = 1.7830, using new Herschel Atacama Large Millimeter/submillimeter Array (ALMA) observations far-infrared fine-structure lines carbon, oxygen, nitrogen. report detections [O iii ] 52 μ m, [N 57 i 63 m from Herschel/PACS, present high-resolution imaging [C ii 158 line, underlying continuum, ALMA....
ZEUS-2, the second generation (z)Redshift and Early Universe Spectrometer, like its predecessor is a moderate resolution (R~1000) long-slit, echelle grating spectrometer optimized for detection of faint, broad lines from distant galaxies. It designed studying star-formation across cosmic time. ZEUS-2 employs three TES bolometer arrays (555 pixels total) to deliver simultaneous, multi-beam spectra in up 4 submillimeter windows. The NIST Boulder-built operate at ~100mK are readout via SQUID...
We detect bright emission in the far infrared fine structure [O III] 88$\mu$m line from a strong lensing candidate galaxy, H-ATLAS J113526.3-014605, hereafter G12v2.43, at z=3.127, using $\rm 2^{nd}$ generation Redshift (z) and Early Universe Spectrometer (ZEUS-2) Atacama Pathfinder Experiment Telescope (APEX). This is only fifth detection of this far-IR sub-millimeter galaxy epoch assembly. The observed luminosity $7.1\times10^{9}\,\rm(\frac{10}{\mu})\,\rm{L_{\odot}}\,$ likely arises HII...
We have detected the CO(6-5), CO(7-6), and [CI] 370 micron lines from nuclear region of NGC 891 with our submillimeter grating spectrometer ZEUS on CSO. These provide constraints photodissociation (PDR) shock models that been invoked to explain H_2 S(0), S(1), S(2) observed Spitzer. analyze data together lines, CO(3-2), IR continuum literature using a combined PDR/shock model. find mid-J CO originates almost entirely shock-excited warm molecular gas; contributions PDRs are negligible. Also,...
Abstract We present JWST Mid-InfraRed Instrument/Medium-Resolution Spectrometer (MIRI/MRS) observations of an infrared luminous disk galaxy, FLS1, at z ∼ 0.54. With a lookback time 5 Gyr, FLS1 is chronologically the midpoint between peak epoch star formation and day. The MRS data provide maps atomic fine structure lines [Ar ii ]6.99, iii ]8.99, [Ne ]12.81, ]15.55 μ m, polycyclic aromatic hydrocarbon (PAH) features 3.3, 6.2, 11.3 warm molecular gas indicators H 2 S(5) S(3); all these emission...
Abstract Accurately determining gas-phase metal abundances within galaxies is critical as metals strongly affect the physics of interstellar medium. To date, vast majority widely used abundance indicators rely on emission from bright optical lines, whose emissivities are highly sensitive to electron temperature. Alternatively, direct-abundance methods exist that measure temperature emitting gas directly, though these usually require challenging observations excited auroral lines. Low-lying...
We present the detection of four far-infrared fine-structure oxygen lines, as well strong upper limits for CO(2–1) and [N ii] 205 μm in 3C 368, a well-studied radio-loud galaxy at z = 1.131. These new taken conjunction with previously observed neon carbon suggest powerful active galactic nucleus (AGN), accompanied by vigorous extended star formation. A starburst dominated O8 stars, an age ∼6.5 Myr, provides good fit to line data. This estimated makes it nearly concurrent latest episode AGN...
We have recently commissioned the 2<sup>nd</sup> generation redshift(z) and Early Universe Spectrometer (ZEUS-2) at Caltech Submillimeter Observatory. ZEUS-2 is a long-slit grating spectrometer (R~1000) for observations in submillimeter wavelength regime that optimized of redshifted far-infrared spectral lines from galaxies early universe. Here we report on design first light performance TES bolometer array installed ZEUS-2. This features 280 pixels each 1.26 mm square arranged to provide...
Galaxies grow their supermassive black holes in concert with stars, although the relationship between these major galactic components is poorly understood. Observations of cosmic growth stars and galaxies suffer from disjoint samples strong effects dust attenuation. The thermal infrared holds incredible potential for simultaneously measuring both star formation hole accretion rates large covering a wide range physical conditions. Spitzer demonstrated this at low redshift, by observing some...