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.

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 The HETDEX Instrumentation: Hobby–Eberly Telescope Wide-field Upgrade and VIRUS

2021 ◽  
Vol 162 (6) ◽  
pp. 298
Author(s):  
Gary J. Hill ◽  
Hanshin Lee ◽  
Phillip J. MacQueen ◽  
Andreas Kelz ◽  
Niv Drory ◽  
...  
Keyword(s):  
Dark Energy ◽  
Large Scale ◽  
Near Infrared ◽  
Cosmological Parameters ◽  
Resolving Power ◽  
Wide Field ◽  
Low Resolution ◽  
Integral Field Spectrograph ◽  
Optical Astronomy ◽  
Integral Field

Abstract The Hobby–Eberly Telescope (HET) Dark Energy Experiment (HETDEX) is undertaking a blind wide-field low-resolution spectroscopic survey of 540 deg2 of sky to identify and derive redshifts for a million Lyα-emitting galaxies in the redshift range 1.9 < z < 3.5. The ultimate goal is to measure the expansion rate of the universe at this epoch, to sharply constrain cosmological parameters and thus the nature of dark energy. A major multiyear Wide-Field Upgrade (WFU) of the HET was completed in 2016 that substantially increased the field of view to 22′ diameter and the pupil to 10 m, by replacing the optical corrector, tracker, and Prime Focus Instrument Package and by developing a new telescope control system. The new, wide-field HET now feeds the Visible Integral-field Replicable Unit Spectrograph (VIRUS), a new low-resolution integral-field spectrograph (LRS2), and the Habitable Zone Planet Finder, a precision near-infrared radial velocity spectrograph. VIRUS consists of 156 identical spectrographs fed by almost 35,000 fibers in 78 integral-field units arrayed at the focus of the upgraded HET. VIRUS operates in a bandpass of 3500−5500 Å with resolving power R ≃ 800. VIRUS is the first example of large-scale replication applied to instrumentation in optical astronomy to achieve spectroscopic surveys of very large areas of sky. This paper presents technical details of the HET WFU and VIRUS, as flowed down from the HETDEX science requirements, along with experience from commissioning this major telescope upgrade and the innovative instrumentation suite for HETDEX.

scholarly journals Determining mass limits around HD 163296 through SPHERE direct imaging data

2019 ◽  
Vol 488 (1) ◽  
pp. 37-46 ◽  
Author(s):  
D Mesa ◽  
M Langlois ◽  
A Garufi ◽  
R Gratton ◽  
S Desidera ◽  
...  
Keyword(s):  
Near Infrared ◽  
The Other ◽  
Field Of View ◽  
Dual Band ◽  
Imaging Data ◽  
Direct Imaging ◽  
Be Star ◽  
Integral Field Spectrograph ◽  
Ringed Structure ◽  
Integral Field

ABSTRACT HD 163296 is a Herbig Ae/Be star known to host a protoplanetary disc with a ringed structure. To explain the disc features, previous works proposed the presence of planets embedded into the disc. We have observed HD 163296 with the near-infrared (NIR) branch of SPHERE composed by IRDIS (InfraRed Dual-band Imager and Spectrograph) and IFS (integral field spectrograph) with the aim to put tight constraints on the presence of substellar companions around this star. Despite the low rotation of the field of view during our observation we were able to put upper mass limits of few MJup around this object. These limits do not allow to give any definitive conclusion about the planets proposed through the disc characteristics. On the other hand, our results seem to exclude the presence of the only candidate proposed until now using direct imaging in the NIR even if some caution has to be taken considered the different wavelength bands of the two observations.

The gas distribution and kinematics in the central region of the Seyfert 2 galaxy NGC 1125

2019 ◽  
Vol 15 (S359) ◽  
pp. 448-449
Author(s):  
Johan M. Marques ◽  
Rogemar A. Riffel ◽  
Thaisa Storchi-Bergmann ◽  
Rogério Riffel ◽  
Marlon R. Diniz
Keyword(s):  
Emission Line ◽  
Central Region ◽  
Near Infrared ◽  
Line Profiles ◽  
Gas Distribution ◽  
Bipolar Outflow ◽  
Broad Component ◽  
Integral Field Spectrograph ◽  
Integral Field

AbstractWe present Gemini Near-Infrared Integral-Field Spectrograph (NIFS) observations of the inner 660 × 660 pc2 of the Seyfert 2 galaxy NGC 1125, which reveals that the emission-line profiles present two kinematic components: a narrow one (σ < 150 km s−1) due to emission of the gas in the disk and a broad component (σ > 150 km s−1) produced by a bipolar outflow, perpendicular to the galaxy’s disk.

Observations of AGN feeding and feedback on Nuclear, Galactic, and Extragalactic Scales

2019 ◽  
Vol 15 (S359) ◽  
pp. 318-322
Author(s):  
D. Michael Crenshaw ◽  
C. L. Gnilka ◽  
T. C. Fischer ◽  
M. Revalski ◽  
B. Meena ◽  
...  
Keyword(s):  
Near Infrared ◽  
Galactic Nuclei ◽  
Host Galaxies ◽  
Spatially Resolved ◽  
Spatially Resolved Spectroscopy ◽  
Integral Field Spectrograph ◽  
Radiative Acceleration ◽  
Imaging Spectrograph ◽  
Integral Field

AbstractWe investigate the processes of active galactic nuclei (AGN) feeding and feedback in the narrow line regions (NLRs) and host galaxies of nearby AGN through spatially resolved spectroscopy with the Gemini Near-Infrared Integral Field Spectrograph (NIFS) and the Hubble Space Telescope’s Space Telescope Imaging Spectrograph (STIS). We examine the connection between nuclear and galactic inflows and outflows by adding long-slit spectra of the host galaxies from Apache Point Observatory. We demonstrate that nearby AGN can be fueled by a variety of mechanisms. We find that the NLR kinematics can often be explained by in situ ionization and radiative acceleration of ambient gas, often in the form of dusty molecular spirals that may be the fueling flow to the AGN.

scholarly journals Resolving the coronal line region of NGC 1068 with near-infrared integral field spectroscopy★

2013 ◽  
Vol 430 (3) ◽  
pp. 2411-2426 ◽  
Author(s):  
X. Mazzalay ◽  
A. Rodríguez-Ardila ◽  
S. Komossa ◽  
Peter J. McGregor
Keyword(s):  
Near Infrared ◽  
Coronal Line ◽  
Integral Field Spectroscopy ◽  
Field Spectroscopy ◽  
Line Region ◽  
Ngc 1068 ◽  
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.

scholarly journals Gas and Stellar Kinematics in NGC 6240

2001 ◽  
Vol 205 ◽  
pp. 220-221
Author(s):  
Matthias Tecza ◽  
Linda Tacconi ◽  
Reinhard Genzel
Keyword(s):  
Near Infrared ◽  
Velocity Dispersion ◽  
Rotating Disk ◽  
Stellar Kinematics ◽  
Rapid Rotation ◽  
Integral Field Spectroscopy ◽  
Stellar Velocity ◽  
Nir Emission ◽  
Absorption Features ◽  
Integral Field

We present results from sub-arcsecond near infrared integral field spectroscopy and millimeter IRAM-interferometry of the interacting galaxy NGC 6240. Using stellar absorption features in the NIR we determined the stellar velocity field and dispersion in NGC 6240. The two NIR emission peaks show rapid rotation and indicate a prograde encounter of the two progenitor galaxies. From the velocity dispersion an excess mass between the two nuclei is detected. This mass can be attributed to a massive rotating disk of cold CO gas located between the nuclei.

scholarly journals The role of the JWST near-infrared spectrograph NIRSpec in understanding the assembly and evolution of galaxies

2019 ◽  
Vol 15 (S352) ◽  
pp. 336-336
Author(s):  
Catarina Alves de Oliveira
Keyword(s):  
Wavelength Range ◽  
Near Infrared ◽  
Target Selection ◽  
Field Of View ◽  
High Contrast ◽  
Evolution Of Galaxies ◽  
James Webb Space Telescope ◽  
Field Unit ◽  
Integral Field

AbstractThe near-infrared spectrograph NIRSpec is one of four instruments aboard the James Webb Space Telescope (JWST). It offers seven dispersers covering the wavelength range from 0.6 to 5.3 micron with resolutions from R ∼ 100 to R ∼ 2700. Using an array of micro-shutters for target selection, the multi-object spectroscopy mode of NIRSpec will be capable of obtaining spectra from a few tens to more than 200 objects simultaneously. It also features an integral field unit with a 3 by 3 arcseconds field of view, and various slits for high contrast spectroscopy of individual objects. We will provide an overview of the capabilities and performances of these three observing modes highlighting how NIRSpec will contribute to the quest to further understand the assembly and evolution of galaxies from the end of re-ionisation epoch to the present day.

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