VLT L-band mapping of the Galactic Center IRS 3-IRS 13 region Evidence for new Wolf-Rayet type stars

Abstract

This paper presents L-band ISAAC and NAOS/CONICA (VLT) spectroscopic observations of the IRS~3-IRS~13 Galactic Center region. The ISAAC data allowed us to build the first spectroscopic data cube of the region in the L-band domain corrected for the foreground extinction. Maps of the water ice and hydrocarbon absorption line strength were then derived. These maps are important diagnostics of the interstellar and circumstellar medium (resp. ISM and CSM). They support our previous results that the absorption features are most probably occuring in the local Galactic center medium and can be associated with the individual sources. Moreover, turbulence seems to affect the studied region of the minispiral which appears like a mixture of a dense and diffuse medium. The Br alpha and Pf gamma emission line maps allowed us to find three sources with broad lines corresponding to a FWHM deconvolved line width of about 1100 km/s and moving towards us with a radial velocity of about -300km/s. These sources are most probably new Wolf-Rayet type stars located in projection to the north and west of IRS 3. Their derived radial velocities and proper motions show that only two of them might belong to the two rotating disks of young stars reported by Genzel et al. (2003) and Levin & Beloborodov (2003)...

arXiv comment12 pages, 11 figures and 2 tables. Accepted in A&A

References in corpus (18)

• Closest Star Seen Orbiting the Supermassive Black Hole at the Centre of the Milky Way
• The First Measurement of Spectral Lines in a Short-Period Star Bound to the Galaxy's Central Black Hole: A Paradox of Youth
• The Stellar Cusp Around the Supermassive Black Hole in the Galactic Center
• Stellar disk in the galactic center -- a remnant of a dense accretion disk?
• Stellar Dynamics in the Galactic centre: Proper Motions and Anisotropy
• The Composition and Distribution of Dust Along the Line of Sight Towards the Galactic Center
• New Three Micron Spectra of Young Stellar Objects with H_2O Ice Bands
• The nature of the Galactic Center source IRS 13 revealed by high spatial resolution in the infrared
• JHKL Photometry and the K-band Luminosity Function at the Galactic Center
• HST Paschen alpha and 1.9 micron imaging of Sgr A West
• Kinematic and structural analysis of the Minispiral in the Galactic Center from BEAR spectro-imagery
• New Results on the Helium Stars in the Galactic Center Using BEAR Spectro-Imagery
• Really Cool Stars at the Galactic Center
• A New 3.25 Micron Absorption Feature toward Mon R2/IRS-3
• Spatially Resolved Observations of the Galactic Center Source, IRS 21
• Stellar Bowshocks in the Northern Arm of the Galactic Center: More Members and Kinematics of the Massive Star Population
• L- and M-band imaging observations of the Galactic Center region
• Dust Embedded Sources at the Galactic Center. 2 to 4$\mu$m imaging and spectroscopy in the central parsec

Cited by in corpus (25)

• Observations of the Icy Universe
• The structure of the nuclear stellar cluster of the Milky Way
• Stellar and wind properties of massive stars in the central parsec of the Galaxy
• Near-infrared proper motions and spectroscopy of infrared excess sources at the Galactic Center
• GC-IRS13E - A puzzling association of three early-type stars
• IRS 13N: a new comoving group of sources at the Galactic Center
• Dust-enshrouded star near supermassive black hole: predictions for high-eccentricity passages near low-luminosity galactic nuclei
• Star Formation in the vicinity of Nuclear Black Holes: Young Stellar Objects close to Sgr A*
• Approaching hell's kitchen: Molecular daredevil clouds in the vicinity of Sgr A*
• The Galactic centre mini-spiral in the mm-regime
• M-Band Spectra of Dust Embedded Sources at the Galactic Center
• Compact mid-IR sources east of galactic center source IRS5
• Absorption at 11 microns in the interstellar medium and embedded sources: evidence for crystalline silicates
• Effect of an isotropic outflow from the Galactic centre on the bow-shock evolution along the orbit
• The apparent tail of the Galactic center object G2/DSO
• X3: a high-mass Young Stellar Object close to the supermassive black hole Sgr~A*
• Intrinsically Polarized Stars and Implication for Star Formation in the Central Parsec of Our Galaxy
• Mapping the aliphatic hydrocarbon content of interstellar dust in the Galactic plane
• High-spectral resolution M-band observations of CO Rot-Vib absorption lines towards the Galactic center
• The Galactic Center in Color: Measuring Extinction with High-Proper-Motion Stars
• Ices in the Galactic Centre : solid ice and gaseous CO in the central parsec
• Mid-infrared extinction toward the Galactic center
• Discovery of a Dense Association of Stars in the Vicinity of the Supermassive Black Hole Sgr A*
• Compact stellar systems hosting an intermediate mass black hole: magnetohydrodynamic study of inflow-outflow dynamics
• Composition of the galactic center star cluster: Population analysis from adaptive optics narrow band spectral energy distributions