Warm ISM in the Sgr A Complex. I: Mid-J CO, atomic carbon, ionized atomic carbon,and ionized nitrogen sub-mm/FIR line observations with the Herschel-HIFI and NANTEN2/SMART telescopes

Abstract

We present large-scale submm observations towards the Sgr A Complex covering ~300 arcmin2. These data were obtained in the frame of the HEXGAL Program with the Herschel-HIFI satellite and are complemented with submm observations obtained with the NANTEN2/SMART telescope as part of the NANTEN2/SMART Central Nuclear Zone Survey. The observed species are CO(4-3) observed with the NANTEN2/SMART telescope, and [CI](1-0), [CI](2-1), [NII](1-0), and [CII](3/2-1/2) observed with the Herschel-HIFI satellite. The observations are presented in a 1 km/s spectral resolution and a spatial resolution ranging from 46" to 28". The spectral coverage of the three lower frequency lines is +-200 km/s, while in the two high frequency lines, the upper LSR velocity limit is +94 km/s and +145 km/s for the [NII] and [CII] lines, respectively. The spatial distribution of the emission in all lines is very widespread. The bulk of the CO emission is found towards Galactic latitudes below the Galactic plane, and all the known molecular clouds are identified. Both neutral atomic carbon lines have their brightest emission associated with the +50 km/s cloud. Their spatial distribution at this LSR velocity describes a crescent-shape structure, which is probably the result of interaction with the energetic event (one or several supernovae explosions) that gave origin to the non-thermal Sgr A-East source. The [CII] and [NII] emissions have most of their flux associated with the thermal Arched-Filaments and the H Region and bright spots in [CII] emission towards the Central Nuclear Disk (CND) are detected. Warm Gas at very high (|Vlsr| > 100 km/s) LSR velocities is also detected towards the line of sight to the Sgr A Complex, and it is most probably located outside the region, in the X1 orbits.

References in corpus (38)

• The Milky Way in Molecular Clouds: A New Complete CO Survey
• Trigonometric Parallaxes of High Mass Star Forming Regions: the Structure and Kinematics of the Milky Way
• ATLASGAL - The APEX Telescope Large Area Survey of the Galaxy at 870 microns
• Discovery of Very-High-Energy Gamma-Rays from the Galactic Centre Ridge
• A 100-parsec elliptical and twisted ring of cold and dense molecular clouds revealed by Herschel around the Galactic Center
• The 6-GHz methanol multibeam maser catalogue I: Galactic Centre region, longitudes 345 to 6
• High-resolution wide-band Fast Fourier Transform spectrometers
• The old nuclear star cluster in the Milky Way: dynamics, mass, statistical parallax, and black hole mass
• A deep submillimetre survey of the Galactic Centre
• Spectral imaging of the Central Molecular Zone in multiple 3-mm molecular lines
• An Extended Star Formation History for the Galactic Center from Hubble Space Telescope/NICMOS Observations
• Candidate super star cluster progenitor gas clouds possibly triggered by close passage to Sgr A*
• A New Spiral Arm of the Galaxy: The Far 3-Kpc Arm
• The H II Region/PDR Connection: Self-Consistent Calculations of Physical Conditions in Star-Forming Regions
• Herschel/HIFI observations of [CII] and [13CII] in PDRs
• The Bolocam Galactic Plane Survey IV: 1.1 and 0.35 mm Dust Continuum Emission in the Galactic Center Region
• A Radio Polarimetric Study of the Galactic Center Threads
• The AST/RO Survey of the Galactic Center Region. I. The Inner 3 Degrees
• GREAT/SOFIA atmospheric calibration
• The Dynamics of Molecular Material Within 15 pcs of the Galactic Center
• Giant molecular clouds and massive star formation in the southern milky way
• A CO J=3-2 Survey of the Galactic Center
• A Wide-area VLA Continuum Survey near the Galactic Center at 6 and 20 cm Wavelengths
• A VLA H92alpha Study of the Arched Filament Complex Near the Galactic Center
• GREAT confirms transient nature of the circumnuclear disk
• ATCA Survey of Ammonia in the Galactic Center: The Temperatures of Dense Gas Clumps between SgrA* and SgrB2
• Spectral imaging of the Central Molecular Zone in multiple 7-mm molecular lines
• A High-Resolution Survey of HI Absorption toward the Central 200 pc of the Galactic Center
• The stability of spectroscopic instruments: A unified Allan variance computation scheme
• Submillimeter Line Emission from LMC N159W: a Dense, Clumpy PDR in a Low Metallicity Environment
• The Molecular Counterpart of the Galactic Center Arched Filament HII Complex: OVRO Observations of the CS(2-1) Line
• A catalogue of soft X-ray sources in the galactic center region
• Radio Detections of Stellar Winds from the Pistol Star and Other Stars in the Galactic Center Quintuplet Cluster
• High Atomic Carbon Abundance in Molecular Clouds in the Galactic Center Region
• XMM-Newton study of the persistent X-ray source 1E1743.1-2843 located in the Galactic Center direction
• Submillimeter Line Emission from LMC 30Dor: The Impact of a Starburst on a Low Metallicity Environment
• A Complete Survey of the Central Molecular Zone in NH3
• Star Formation Sites toward the Galactic Center Region: The Correlation of CH3OH Masers, H2O Masers, and Near-IR Green Sources

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