scholarly journals Spatially resolved Lyman-α emission around radio bright quasars

2021 ◽  
Author(s):  
Gitika Shukla ◽  
Raghunathan Srianand ◽  
Neeraj Gupta ◽  
Patrick Petitjean ◽  
Andrew J Baker ◽  
...  
Keyword(s):  
Radio Emission ◽  
Large Scale ◽  
Strong Dependence ◽  
Large Telescope ◽  
Mid Infrared ◽  
Spatially Resolved ◽  
Integral Field Spectroscopy ◽  
The Relationship ◽  
Integral Field ◽  
Line Equivalent Width

Abstract We use Southern African Large Telescope (SALT) to perform long-slit spectroscopic observations of 23 newly discovered radio-loud quasars (RLQs) at 2.7 < z < 3.3. The sample consists of powerful AGN brighter than 200 mJy at 1.4 GHz and is selected on the basis of mid-infrared colors i.e., unbiased to the presence of dust. We report 7 confirmed and 5 tentative detections of diffuse Lyα emission in the sample. We present the properties of diffuse Lyα emission and discuss in detail its relationship to different quasar properties. We find strong dependence of Lyα halo detection rate on the extent of radio source, spectral luminosity of RLQ at 420 MHz (L420MHz), presence of associated C IV absorption and nuclear He II emission line equivalent width. As seen in previous surveys, the FWHM of diffuse Lyα emission in the case of confirmed detections are much higher (i.e.>1000 km/s in all, except one). Using the samples of high-z radio-loud quasars and galaxies from literature, we confirm the correlation between the Lyα halo luminosity and its size with L420MHz. The same quantities are found to be correlating weakly with the projected linear size of the radio emission. Our sample is the second largest sample of RLQs being studied for the presence of diffuse Lyα emission and fills in a redshift gap between previous such studies. Integral Field Spectroscopy is required to fully understand the relationship between the large scale radio emission and the overall distribution, kinematics and over density of Lyα emission in the field of these RLQs.

A panchromatic spatially resolved study of the inner 500 pc of NGC 1052

2019 ◽  
Vol 15 (S359) ◽  
pp. 427-428
Author(s):  
Luis G. Dahmer-Hahn ◽  
Rogério Riffel ◽  
Tiago V. Ricci ◽  
João E. Steiner ◽  
Thaisa Storchi-Bergmann ◽  
...  
Keyword(s):  
Large Scale ◽  
Near Infrared ◽  
Elliptical Galaxy ◽  
Population Analysis ◽  
Optical Data ◽  
Radio Jets ◽  
Spatially Resolved ◽  
Integral Field Spectroscopy ◽  
The Galaxy ◽  
Integral Field

AbstractWe analyzed the inner 320 × 535 pc2 of the elliptical galaxy NGC 1052 with integral field spectroscopy, both in the optical and in the near-infrared (NIR). The stellar population analysis revealed a dominance of old stellar populations from the optical data, and an intermediate-age ring from NIR data. When combining optical+NIR data, optical results were favoured. The emission-line analysis revealed five kinematic components, where two of them are unresolved and probably associated with the active galactic nucleus (AGN), one is associated with large-scale shocks, one with the radio jets, and the last could be explained by either a bipolar outflow, rotation in an eccentric disc or a combination of a disc and large-scale gas bubbles. Our results also indicate that the emission within the galaxy is caused by a combination of shocks and photoionization by the AGN.

scholarly journals A panchromatic spatially resolved study of the inner 500 pc of NGC 1052 – II. Gas excitation and kinematics

2019 ◽  
Vol 489 (4) ◽  
pp. 5653-5668 ◽  
Author(s):  
L G Dahmer-Hahn ◽  
R Riffel ◽  
T V Ricci ◽  
J E Steiner ◽  
T Storchi-Bergmann ◽  
...  
Keyword(s):  
Large Scale ◽  
Near Infrared ◽  
Elliptical Galaxy ◽  
Field Of View ◽  
Spatially Resolved ◽  
Broad Component ◽  
Single Mechanism ◽  
Line Region ◽  
Nir Emission ◽  
Integral Field

ABSTRACT We map the optical and near-infrared (NIR) emission-line flux distributions and kinematics of the inner 320 × 535 pc2 of the elliptical galaxy NGC 1052. The integral field spectra were obtained with the Gemini Telescope using the GMOS-IFU and NIFS instruments, with angular resolutions of 0.88 and 0.1 arcsec in the optical and NIR, respectively. We detect five kinematic components: (1) and (2) two spatially unresolved components: a broad-line region visible in H α, with a full width at half-maximum (FWHM) of ∼3200 km s−1, and an intermediate broad component seen in the [O iii] λλ4959,5007 doublet; (3) an extended intermediate-width component with 280 km s−1 < FWHM < 450 km s−1 and centroid velocities up to 400 km s−1, which dominates the flux in our data, attributed either to a bipolar outflow related to the jets, rotation in an eccentric disc or to a combination of a disc and large-scale gas bubbles; (4) and (5) two narrow (FWHM < 150 km s−1) components, one visible in [O iii], and another visible in the other emission lines, extending beyond the field of view of our data, which is attributed to large-scale shocks. Our results suggest that the ionization within the observed field of view cannot be explained by a single mechanism, with photoionization being the dominant mechanism in the nucleus with a combination of shocks and photoionization responsible for the extended ionization.

scholarly journals Spatially resolved integral field spectroscopy of the ionized gas in IZw18

2016 ◽  
Vol 459 (3) ◽  
pp. 2992-3004 ◽  
Author(s):  
C. Kehrig ◽  
J. M. Vílchez ◽  
E. Pérez-Montero ◽  
J. Iglesias-Páramo ◽  
J. D. Hernández-Fernández ◽  
...  
Keyword(s):  
Ionized Gas ◽  
Spatially Resolved ◽  
Integral Field Spectroscopy ◽  
Field Spectroscopy ◽  
Integral Field

scholarly journals The SAMI Galaxy Survey: decomposed stellar kinematics of galaxy bulges and disks

2020 ◽  
Vol 495 (4) ◽  
pp. 4638-4658 ◽  
Author(s):  
Sree Oh ◽  
Matthew Colless ◽  
Stefania Barsanti ◽  
Sarah Casura ◽  
Luca Cortese ◽  
...  
Keyword(s):  
Rotation Velocity ◽  
Stellar Kinematics ◽  
Spatially Resolved ◽  
Integral Field Spectroscopy ◽  
Spin Parameter ◽  
Wide Range ◽  
The Galaxy ◽  
Kinematic Behaviour ◽  
Disk Component ◽  
Integral Field

ABSTRACT We investigate the stellar kinematics of the bulge and disk components in 826 galaxies with a wide range of morphology from the Sydney-AAO Multi-object Integral-field spectroscopy Galaxy Survey. The spatially resolved rotation velocity (V) and velocity dispersion (σ) of bulge and disk components have been simultaneously estimated using the penalized pixel fitting (ppxf) method with photometrically defined weights for the two components. We introduce a new subroutine of ppxf for dealing with degeneracy in the solutions. We show that the V and σ distributions in each galaxy can be reconstructed using the kinematics and weights of the bulge and disk components. The combination of two distinct components provides a consistent description of the major kinematic features of galaxies over a wide range of morphological types. We present Tully–Fisher and Faber–Jackson relations showing that the galaxy stellar mass scales with both V and σ for both components of all galaxy types. We find a tight Faber–Jackson relation even for the disk component. We show that the bulge and disk components are kinematically distinct: (1) the two components show scaling relations with similar slopes, but different intercepts; (2) the spin parameter λR indicates bulges are pressure-dominated systems and disks are supported by rotation; and (3) the bulge and disk components have, respectively, low and high values in intrinsic ellipticity. Our findings suggest that the relative contributions of the two components explain, at least to first order, the complex kinematic behaviour of galaxies.

scholarly journals Orientation of galactic bulge planetary nebulae toward the Galactic center

2014 ◽  
Vol 10 (S312) ◽  
pp. 128-130
Author(s):  
Ashkbiz Danehkar ◽  
Quentin A. Parker
Keyword(s):  
Emission Line ◽  
Galactic Center ◽  
Planetary Nebulae ◽  
Wide Field ◽  
Spatially Resolved ◽  
Integral Field Spectroscopy ◽  
Field Spectroscopy ◽  
National University ◽  
Hα Emission ◽  
Integral Field

AbstractWe have used the Wide Field Spectrograph on the Australian National University 2.3-m telescope to perform the integral field spectroscopy for a sample of the Galactic planetary nebulae. The spatially resolved velocity distributions of the Hα emission line were used to determine the kinematic features and nebular orientations. Our findings show that some bulge planetary nebulae toward the Galactic center have a particular orientation.

scholarly journals FROM GLOBAL TO SPATIALLY RESOLVED IN LOW-REDSHIFT GALAXIES

2021 ◽  
Vol 57 (1) ◽  
Author(s):  
S. F. Sánchez ◽  
C. J. Walcher ◽  
C. Lopez-Cobá ◽  
J. K. Barrera-Ballesteros ◽  
A. Mejía-Narváez ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Galaxy Evolution ◽  
Ionized Gas ◽  
Evolution Of Galaxies ◽  
Spatially Resolved ◽  
Integral Field Spectroscopy ◽  
Field Spectroscopy ◽  
Stellar Properties ◽  
Integral Field ◽  
Redshift Galaxies

Our understanding of the structure, composition and evolution of galaxies hasstrongly improved in the last decades, mostly due to new results based on large spectro-scopic and imaging surveys. In particular, the nature of ionized gas, its ionization mech-anisms, its relation with the stellar properties and chemical composition, the existence ofscaling relations that describe the cycle between stars and gas, and the corresponding evo-lution patterns have been widely explored and described. More recently, the introduction ofadditional techniques, in particular integral field spectroscopy, and their use in large galaxysurveys, have forced us to re-interpret most of those recent results from a spatially resolvedperspective. This review is aimed to complement recent efforts to compile and summarizethis change of paradigm in the interpretation of galaxy evolution. To this end we replicatepublished results, and present novel ones, based on the largest compilation of IFS data ofgalaxies in the nearby universe to date.

scholarly journals THE SPATIALLY RESOLVED STAR FORMATION LAW FROM INTEGRAL FIELD SPECTROSCOPY: VIRUS-P OBSERVATIONS OF NGC 5194

2009 ◽  
Vol 704 (1) ◽  
pp. 842-862 ◽  
Author(s):  
Guillermo A. Blanc ◽  
Amanda Heiderman ◽  
Karl Gebhardt ◽  
Neal J. Evans ◽  
Joshua Adams
Keyword(s):  
Star Formation ◽  
Spatially Resolved ◽  
Integral Field Spectroscopy ◽  
Field Spectroscopy ◽  
Integral Field

scholarly journals Imminent understanding of the structure of nearby AGN from IFUs

2013 ◽  
Vol 9 (S304) ◽  
pp. 252-252
Author(s):  
Richard Davies
Keyword(s):  
Black Hole ◽  
Star Formation ◽  
Near Infrared ◽  
Far Infrared ◽  
Absorption Lines ◽  
Robust Approach ◽  
Spatially Resolved ◽  
Integral Field Spectroscopy ◽  
Field Spectroscopy ◽  
Integral Field

AbstractIntegral field spectroscopy provides us with immensely rich datasets about spatially resolved distributions and kinematics of emission and absorption lines. In this contribution I will describe some of the key insights that have been made about AGN using optical, near infrared, and far infrared IFUs. These encompass gas inflow and outflow mechanisms, and the relations between star formation, the torus, and accretion onto the black hole. Progress so far has largely relied on archetypal and small sets of objects. In the future, a more statistically robust approach will be required. I will end by discussing a number of issues that can easily confuse an emerging picture, and need to be borne in mind for such surveys.

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