A5021537198- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Astrophysics and Star Formation Studies
- Stellar, planetary, and galactic studies
- Astrophysical Phenomena and Observations
- Astrophysics and Cosmic Phenomena
- Gamma-ray bursts and supernovae
- Astronomical Observations and Instrumentation
- Radio Astronomy Observations and Technology
- Spectroscopy and Laser Applications
- Adaptive optics and wavefront sensing
- Solar and Space Plasma Dynamics
- Cosmology and Gravitation Theories
- Astro and Planetary Science
- Pulsars and Gravitational Waves Research
- Geophysics and Gravity Measurements
- Solid-state spectroscopy and crystallography
- Scientific Research and Discoveries
- Black Holes and Theoretical Physics
- Atomic and Molecular Physics
- Spacecraft Design and Technology
- History and Developments in Astronomy
- Atmospheric Ozone and Climate
- Particle Accelerators and Free-Electron Lasers
- Relativity and Gravitational Theory
Space Telescope Science Institute
1996-2024
Michigan Science Center
2022-2023
California Institute of Technology
2008-2017
Infrared Processing and Analysis Center
2008-2017
Institut d'Astrophysique Spatiale
2010
Université Paris-Sud
2010
Laboratoire d’Etudes du Rayonnement et de la Matière en Astrophysique et Atmosphères
2010
Observatoire de Paris
2010
Centre National de la Recherche Scientifique
2010
European Space Astronomy Centre
2010
The Nuclear Spectroscopic Telescope Array (NuSTAR) mission, launched on 2012 June 13, is the first focusing high-energy X-ray telescope in orbit. NuSTAR operates band from 3 to 79 keV, extending sensitivity of far beyond ∼10 keV cutoff achieved by all previous satellites. inherently low background associated with concentrating light enables probe hard sky a more than 100-fold improvement over collimated or coded mask instruments that have operated this bandpass. Using its unprecedented...
We report subarcsec-resolution X-ray imaging of the core Perseus cluster around galaxy NGC 1275 with Chandra Observatory. The ROSAT-discovered holes associated radio lobes have bright rims which are cooler than surrounding gas and not due to shocks. themselves may contain some hotter gas. map strong photoelectric absorption across Northern lobe rim a small infalling irregular galaxy, known as high velocity system. Two outer holes, one was previously known, identified recently found spurs...
The Spitzer Survey of Stellar Structure in Galaxies S^4G is an Exploration Science Legacy Program approved for the post-cryogenic mission. It a volume-, magnitude-, and size-limited (d < 40 Mpc, |b| > 30 degrees, m_(Bcorr) 15.5, D25>1') survey 2,331 galaxies using IRAC at 3.6 4.5 microns. Each galaxy observed 240 s mapped to 1.5 x D25. final mosaicked images have typical 1 sigma rms noise level 0.0072 0.0093 MJy / sr microns, respectively. Our azimuthally-averaged surface brightness profile...
The Near-Infrared Spectrograph (NIRSpec) on the James Webb Space Telescope (JWST) offers first opportunity to use integral-field spectroscopy from space at near-infrared wavelengths. More specifically, NIRSpec's unit can obtain spectra covering wavelength range $0.6 - 5.3~\mu$m for a contiguous 3.1 arcsec $\times$ 3.2 sky area spectral resolutions of $R \approx 100$, 1000, and 2700. In this paper we describe optical mechanical design NIRSpec mode, together with its expected performance. We...
Abstract The Near-Infrared Spectrograph (NIRSpec) is one of the four focal plane instruments on James Webb Space Telescope. In this paper, we summarize in-orbit performance NIRSpec, as derived from data collected during its commissioning campaign and first few months nominal science operations. More specifically, discuss some critical hardware components such two NIRSpec Hawaii-2RG detectors, wheel mechanisms, microshutter array. We also accuracy target acquisition procedures used to...
Abstract Quasar-driven galactic outflows are a major driver of the evolution massive galaxies. We report observations powerful galactic-scale outflow in z = 3 extremely red and intrinsically luminous ( L bol ≃ 5 × 10 47 erg s −1 ) quasar SDSSJ1652 + 1728 with Near-infrared Spectrograph on board JWST. analyze kinematics rest-frame optical emission lines identify quasar-driven extending out to ∼10 kpc from velocity offset v r ± 500 km high dispersion (FWHM 700–2400 ). Due JWST’s unprecedented...
We present time-resolved broad-band observations of the quasar 3C 279 obtained from multi-wavelength campaigns conducted during first two years Fermi Gamma-ray Space Telescope mission. While investigating previously reported gamma-ray/optical flare accompanied by a change in optical polarization, we found that emission appears delayed with respect to gamma-ray about 10 days. X-ray reveal pair `isolated' flares separated ~90 days, only weak counterparts. The spectral structure measured...
H2 pure-rotational emission lines are detected from warm (100-1500 K) molecular gas in 17/55 (31% of) radio galaxies at redshift z<0.22 observed with the Spitzer IR Spectrograph. The summed 0-0 S(0)-S(3) line luminosities L(H2)=7E38-2E42 erg/s, yielding masses up to 2E10 Msun. These galaxies, of both FR morphological types, help firmly establish new class radio-selected hydrogen (radio MOHEGs). MOHEGs have extremely large 7.7 micron PAH ratios: L(H2)/L(PAH7.7) = 0.04-4, a factor 300 greater...
NGC 1266 is a nearby lenticular galaxy that harbors massive outflow of molecular gas powered by the mechanical energy an active galactic nucleus (AGN). It has been speculated such outflows hinder star formation (SF) in their host galaxies, providing form feedback to process formation. Previous studies, however, indicated only jets from extremely rare, high-power quasars or radio galaxies could impart significant on hosts. Here we present detailed observations and dust continuum at millimeter...
We present the first Herschel spectroscopic detections of [OI]63 and [CII]158 micron fine-structure transitions, a single para-H2O line from 35 x 15 kpc^2 shocked intergalactic filament in Stephan's Quintet. The is believed to have been formed when high-speed intruder group collided with clumpy intergroup gas. Observations PACS spectrometer provide evidence for broad (> 1000 km s^-1) luminous [CII] profiles, as well fainter [OI]63micron emission. SPIRE FTS observations reveal water emission...
Abstract Quasar feedback may regulate the growth of supermassive black holes, quench coeval star formation, and impact galaxy morphology circumgalactic medium. However, direct evidence for quasar in action at epoch peak hole accretion z ≈ 2 remains elusive. A good case point is = 1.6 WISEA J100211.29+013706.7 (XID 2028), where past analyses same ground-based data have come to different conclusions. Here, we revisit this object with integral-field unit Near Infrared Spectrograph on board JWST...
We present detailed evidence for a warm absorber in the Seyfert 1 galaxy MCG -6-30-15 and dispute earlier claims relativistic O line emission. The High-Energy Transmission Grating spectra show numerous narrow, unresolved (FWHM ≲ 200 km s-1) absorption lines from wide range of ionization states N, O, Mg, Ne, Si, S, Ar, Fe. VII edge 1s2-1snp resonance series to n = 9 are clearly detected at rest active galactic nucleus frame. attribute previous reports an apparently highly redshifted (n > 5)...
We have found broad Hα and Hβ line emission in spectra of BL Lacertae taken on 1995 May 21 June 1: those occasions Lac did not meet the defining criteria for class named after it. The luminosity, ~2 × 1041 h-2 erg s-1 H0 = 100 h km Mpc-1, is significantly above detection threshold older published which do show line. Several possible explanations increase luminosity are discussed. continuum was at faint end its commonly observed range: V ~ 16.0 21. polarization, measured 1, also near low...
We present a Spitzer mid-infrared survey of 42 Fanaroff-Riley class II radio galaxies and quasars from the 3CRR catalog at redshift z < 1. All 45% ± 12% narrow-line have mid-IR luminosity νLν(15 μm) > 8 × 1043 ergs s-1, indicating strong thermal emission hot dust in active galactic nucleus. Our results demonstrate power to unveil dust-obscured quasars. The ratio "mid-IR luminous" indicates mean covering fraction 0.56 0.15, assuming relatively isotropic emission. analyze spectra 14 luminous...
We describe observations of aromatic features at 7.7 and 11.3 μm in AGNs three types, including PG, 2MASS, 3CR objects. The feature has been demonstrated to originate predominantly from star formation. Based on the aromatic-derived star-forming luminosity, we find that far-IR emission can be dominated by either formation or nuclear emission; average contribution is around 25% 70 160 μm. infrared luminosity functions types are flatter than those field galaxies, implying activity tend enhanced...
We determine an absolute calibration for the Multiband Imaging Photometer Spitzer 24 μm band and recommend adjustments to published calibrations Two Micron All Sky Survey (2MASS), Infrared Array Camera (IRAC), IRAS photometry put them on same scale. show that consistent results are obtained by basing either average A0V star spectral energy distribution (SED), or using absolutely calibrated SED of Sun in comparison with solar-type stellar (the solar analog method). After rejection a small...
We explore the relationships between polycyclic aromatic hydrocarbon (PAH) feature strengths, mid-infrared continuum luminosities, far-infrared spectral slopes, optical spectroscopic classifications, and silicate depths in a sample of 107 ULIRGs observed with Infrared Spectrograph on Spitzer Space Telescope. The detected 6.2 μm PAH equivalent widths (EWs) span more than 2 orders magnitude (~0.006-0.8 μm), H II-like spectra or steep slopes (S25/S60 < 0.2) typically have EWs that are half...
We present a detailed analysis of the gas conditions in H_2 luminous radio galaxy 3C326N at z~0.1, which has low star formation rate (SFR~0.07 M_sun/yr) spite surface density similar to those starburst galaxies. Its star-formation efficiency is likely factor ~20-30 lower than ordinary star-forming Combining new IRAM CO emission-line interferometry with existing Spitzer mid-infrared spectroscopy, we find that luminosity ratio and pure rotational line emission factors 10-100 what usually...
We report NuSTAR observations of a sample six X-ray weak broad absorption line (BAL) quasars. These targets, at z=0.148-1.223, are among the optically brightest and most luminous BAL quasars known z<1.3. However, their rest-frame 2 keV luminosities 14 to >330 times weaker than expected for typical Our results from pilot study two low-redshift quasars, Chandra stacking analysis high-redshift spectral local quasar Mrk 231 have already suggested existence intrinsically i.e., not emitting X-rays...
Observations of ionized and neutral gas outflows in radio-galaxies (RGs) suggest that AGN radio jet feedback has a galaxy-scale impact on the host ISM, but it is still unclear how molecular affected. We present deep Spitzer IRS spectroscopy 8 RGs show fast HI outflows. All these HI-outflow have bright H2 mid-IR lines cannot be accounted for by UV or X-ray heating. This suggests jet, which drives outflow, also responsible shock-excitation warm gas. In addition, does not share kinematics...
Extremely red quasars, with bolometric luminosities exceeding $10^{47}$ erg s$^{-1}$, are a fascinating high-redshift population that is absent in the local universe. They best candidates for supermassive black holes accreting at rates or above Eddington limit, and they associated most rapid powerful outflows of ionized gas known to date. also hosted by massive galaxies. Here we present first integral field unit (IFU) observations quasar obtained Near Infrared Spectrograph (NIRSpec) on board...
Abstract Massive galaxies formed most actively at redshifts z = 1–3 during the period known as “cosmic noon.” Here we present an emission-line study of extremely red quasar SDSSJ165202.64+172852.3’s host galaxy 2.94, based on observations with Near Infrared Spectrograph integral field unit board JWST. We use standard diagnostic ratios to map sources gas ionization across and a swarm companion galaxies. The dominates photoionization, but also discover shock-excited regions orthogonal cone...
Abstract Spitzer spectral maps reveal a disk of highly luminous, warm (>150 K) H 2 in the center massive spiral galaxy Messier 58, which hosts radio-loud active galactic nucleus (AGN). The inner 2.6 kpc appears to be overrun by shocks from radio jet cocoon. Gemini NIRI imaging 1–0 S(1) emission line, Atacama Large Millimeter/submillimeter Array CO 2–1, and Hubble Space Telescope multiband imagery indicate that much molecular gas is shocked situ, corresponding lanes dusty toward nucleus....
We present first results from James Webb Space Telescope (JWST) Near-Infrared Spectrograph (NIRSpec), Mid-Infrared Instrument (MIRI), and Keck Cosmic Imager (KCWI) integral field spectroscopy of the powerful but highly obscured host-galaxy jetted radio source Cygnus A. detect 169 infrared emission lines at 1.7--27 micron explore kinematics physical properties extended narrow-line region (NLR) in unprecedented detail. The density-stratified NLR appears to be shaped by initial blow-out ongoing...
We present images from five observations of the quasar 3C 273 with Chandra X-Ray Observatory. The jet has at least four distinct features that are not resolved in previous observations. first knot (A1) is very bright X-rays. Its X-ray spectrum well fitted a power law α = 0.60 ± 0.05 (where Sν ∝ ν-α). Combining this measurement lower frequency data shows pure synchrotron model can fit 1.647 GHz to 5 keV (over nine decades energy) 0.76 0.02, similar spectral slope. Thus, we place limit on...