Multiwavelength analysis of OH Megamaser galaxies: The case of IRAS11506-3851

2020 ◽  
Vol 15 (S359) ◽  
pp. 347-349
Author(s):  
Carpes P. Hekatelyne ◽  
Thaisa Storchi-Bergmann
Keyword(s):  
Active Galactic Nuclei ◽  
Hubble Space Telescope ◽  
Galactic Nuclei ◽  
Large Array ◽  
Very Large Array ◽  
Star Forming ◽  
Star Forming Regions ◽  
Field Unit ◽  
Mixed Transition ◽  
Integral Field

AbstractWe present Multi-Object Spectrograph (GMOS) Integral Field Unit (IFU), Hubble Space Telescope (HST) and Very Large Array (VLA) observations of the inner kpc of the OH Megamaser galaxy IRAS 11506-3851. In this work we discuss the kinematics and excitation of the gas as well as its radio emission. The HST images reveal an isolated spiral galaxy and the combination with the GMOS-IFU flux distributions allowed us to identify a partial ring of star-forming regions surrounding the nucleus with a radius of ≍500 pc. The emission-line ratios and excitation map reveal that the region inside the ring present mixed/transition excitation between those of Starbursts and Active Galactic Nuclei (AGN), while regions along the ring are excited by Starbursts. We suggest that we are probing a buried or fading AGN that could be both exciting the gas and originating an outflow.

scholarly journals The OH Megamaser galaxy IRAS11506−3851: an AGN and star formation revealed by multiwavelength observations

2020 ◽  
Vol 498 (2) ◽  
pp. 2632-2644
Author(s):  
C Hekatelyne ◽  
Rogemar A Riffel ◽  
Thaisa Storchi-Bergmann ◽  
Preeti Kharb ◽  
Andrew Robinson ◽  
...  
Keyword(s):  
Active Galactic Nucleus ◽  
Velocity Dispersion ◽  
Hubble Space Telescope ◽  
Present Stage ◽  
Low Velocity ◽  
Very Large Array ◽  
Star Forming ◽  
Star Forming Regions ◽  
Field Unit ◽  
Integral Field

ABSTRACT We present Gemini Multi-Object Spectrograph (GMOS) Integral Field Unit (IFU), Hubble Space Telescope (HST), and Very Large Array (VLA) observations of the OH Megamaser (OHM) galaxy IRAS 11506−3851. The HST images reveal an isolated spiral galaxy and the combination with the GMOS-IFU flux distributions and VLA data allow us to identify a partial ring of star-forming regions surrounding the nucleus with a radius of ≈ 500 pc. While this ring shows starburst excitation and low velocity dispersion, the region internal to the ring shows higher excitation and velocity dispersion values, with values increasing towards its borders at ≈ 240 pc from the nucleus, resembling a projected bubble. The enhanced excitation and velocity dispersion of this bubble surrounds a 8.5-GHz radio emission structure, supporting its origin in a faint active galactic nucleus (AGN) that is mostly shocking the surrounding gas via a plasma ejection seen in radio at the present stage. This is the fourth of the 5 OHM galaxies we have studied so far (from our sample of 15 OHM) for which GMOS-IFU data indicate the presence of a previously unknown faint AGN at the nucleus, consistent with the hypothesis that OHM galaxies harbour recently triggered AGN.

scholarly journals High Resolution Observations of Herbig-Haro Flows

2004 ◽  
Vol 221 ◽  
pp. 333-344
Author(s):  
B. Reipurth ◽  
S. Andrews ◽  
J. Bally ◽  
T. L. Beck
Keyword(s):  
Spectroscopic Data ◽  
Hubble Space Telescope ◽  
Young Stars ◽  
Radio Continuum ◽  
High Spectral Resolution ◽  
Large Array ◽  
Very Large Array ◽  
Field Unit ◽  
Observational Techniques ◽  
Integral Field

Observational techniques with high angular and high spectral resolution have become available in recent years and have had a major impact on the study of Herbig-Haro outflows from very young stars. We discuss new results obtained using WFPC2, ACS and STIS onboard the Hubble Space Telescope, as well as spectroscopic data obtained at the Keck telescope and with the Integral Field Unit at the Gemini telescope. We also discuss centimeter radio continuum maps from the Very Large Array and their importance in testing scenarios for the formation of giant Herbig-Haro flows.

scholarly journals Chemical abundances in Seyfert galaxies – V. The discovery of shocked emission outside the AGN ionization axis

2020 ◽  
Vol 501 (1) ◽  
pp. L54-L59
Author(s):  
R A Riffel ◽  
O L Dors ◽  
M Armah ◽  
T Storchi-Bergmann ◽  
A Feltre ◽  
...  
Keyword(s):  
Electron Temperature ◽  
Active Galactic Nuclei ◽  
Direct Evidence ◽  
Galactic Nuclei ◽  
Seyfert Galaxies ◽  
Chemical Abundances ◽  
Temperature Distributions ◽  
Field Unit ◽  
Dusty Torus ◽  
Integral Field

ABSTRACT We present maps for the electron temperature in the inner kpc of three luminous Seyfert galaxies: Mrk 79, Mrk 348, and Mrk 607 obtained from Gemini Multi-Object Spectrograph-integral field unit observations at spatial resolutions of ∼110–280 pc. We study the distributions of electron temperature in active galaxies and find temperatures varying in the range from ∼8000 to $\gtrsim 30\, 000\,$K. Shocks due to gas outflows play an important role in the observed temperature distributions of Mrk 79 and Mrk 348, while standard photoionization models reproduce the derived temperature values for Mrk 607. In Mrk 79 and Mrk 348, we find direct evidence for shock ionization with overall orientation orthogonal to the ionization axis, where shocks can be easily observed as the active galactic nuclei radiation field is shielded by the nuclear dusty torus. This also indicates that even when the ionization cones are narrow, the shocks can be much wider angle.

scholarly journals A Very Large Array Survey of Luminous Extranuclear Star-forming Regions in Luminous Infrared Galaxies in GOALS

2019 ◽  
Vol 881 (1) ◽  
pp. 70 ◽  
Author(s):  
S. T. Linden ◽  
Y. Song ◽  
A. S. Evans ◽  
E. J. Murphy ◽  
L. Armus ◽  
...  
Keyword(s):  
Large Array ◽  
Infrared Galaxies ◽  
Very Large Array ◽  
Star Forming ◽  
Luminous Infrared Galaxies ◽  
Star Forming Regions

scholarly journals VSOP, A Space VLBI Programme

1990 ◽  
Vol 123 ◽  
pp. 263-269
Author(s):  
H. Hirabayashi
Keyword(s):  
Active Galactic Nuclei ◽  
Phase Transfer ◽  
Galactic Nuclei ◽  
Satellite Orbit ◽  
Radio Sources ◽  
Space Observatory ◽  
Stellar Objects ◽  
Radio Observatory ◽  
Star Forming ◽  
Star Forming Regions

AbstractVSOP, VLBI Space Observatory Programme, is an approved space VLBI programme of ISAS for the study of very compact radio sources with the synthesized aperture of 30,000 km diameter, by connecting an orbiting radio observatory with ground radiotelescopes. The VSOP satellite carrying 10 m antenna with 1.6, 5, and 22 GHz band receivers will be launched in early 1995 by M-V rocket of ISAS into an eccentric orbit with 20,000 km in apogee height. The tracking network will be formed for the satellite orbit determination, phase transfer and IF down-link. VSOP aims imaging capability with best resolution of 0.0001 arc second in 22 GHz band. Imaging of active galactic nuclei, star forming regions and stellar objects, and radioastrometry are main scientific targets.

AGN Feedback and its Importance to Galaxy Evolution in the Era of the ngVLA

2018 ◽  
Vol 14 (A30) ◽  
pp. 78-81
Author(s):  
Kristina Nyland
Keyword(s):  
Star Formation ◽  
Active Galactic Nuclei ◽  
Galaxy Evolution ◽  
Angular Resolution ◽  
Galactic Nuclei ◽  
Gas Content ◽  
Large Array ◽  
Very Large Array ◽  
Frequency Coverage ◽  
Evolutionary Role

AbstractEnergetic feedback by Active Galactic Nuclei (AGN) plays an important evolutionary role in the regulation of star formation (SF) on galactic scales. However, the effects of this feedback as a function of redshift and galaxy properties such as mass, environment and cold gas content remain poorly understood. The broad frequency coverage (1 to 116 GHz), high collecting area (about ten times higher than the Karl G. Jansky Very Large Array), and superb angular resolution (maximum baselines of at least a few hundred km) of the proposed next-generation Very Large Array (ngVLA) are uniquely poised to revolutionize our understanding of AGN and their role in galaxy evolution.

scholarly journals Zooming into local active galactic nuclei: The power of combining SDSS-IV MaNGA with higher resolution integral field unit observations

2017 ◽  
pp. stx246 ◽  
Author(s):  
Dominika Wylezalek ◽  
Allan Schnorr Müller ◽  
Nadia L. Zakamska ◽  
Thaisa Storchi-Bergmann ◽  
Jenny E. Greene ◽  
...  
Keyword(s):  
Active Galactic Nuclei ◽  
Galactic Nuclei ◽  
Field Unit ◽  
Integral Field

A deep Chandra survey for faint X-ray sources in the Galactic globular cluster M30, and searches for optical and radio counterparts

2020 ◽  
Vol 499 (3) ◽  
pp. 3338-3355
Author(s):  
Yue Zhao ◽  
Craig O Heinke ◽  
Haldan N Cohn ◽  
Phyllis M Lugger ◽  
Sebastien Guillot ◽  
...  
Keyword(s):  
Active Galactic Nuclei ◽  
Globular Cluster ◽  
Globular Clusters ◽  
Hubble Space Telescope ◽  
Cataclysmic Variables ◽  
Galactic Nuclei ◽  
Point Sources ◽  
Very Large Array ◽  
X Ray ◽  
Radial Profiles

ABSTRACT We present a deep (∼330 ks) Chandra survey of the Galactic globular cluster M30 (NGC 7099). Combining the new Cycle 18 with the previous Cycle 3 observations we report a total of 10 new X-ray point sources within the 1${_{.}^{\prime}}$03 half-light radius, compiling an extended X-ray catalogue of a total of 23 sources. We incorporate imaging observations by the Hubble Space Telescope and the Karl G. Jansky Very Large Array from the MAVERIC survey to search for optical and radio counterparts to the new and old sources. Two X-ray sources are found to have a radio counterpart, including the known millisecond pulsar PSR J2140−2310A, the radio position of which also matches a previously reported faint optical counterpart which is slightly redder than the main sequence. We found optical counterparts to 18 of the 23 X-ray sources, identifying two new cataclysmic variables (CVs), five new CV candidates, two new candidates of RS CVn type of active binary (AB), and two new candidates of BY Dra type of AB. The remaining unclassified X-ray sources are likely background active galactic nuclei (AGNs), as their number is consistent with the expected number of AGN at our X-ray sensitivity. Finally, our analysis of radial profiles of different source classes suggests that bright CVs are more centrally distributed than faint CVs in M30, consistent with other core-collapsed globular clusters.

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