Other
Scientific paper
Nov 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004phdt.........3t&link_type=abstract
Thesis (PhD). UNIVERSITY OF CALIFORNIA, LOS ANGELES, Source DAI-B 65/05, p. 2452, Nov 2004, 177 pages.
Other
Scientific paper
High resolution near- and mid-infrared images of the central parsec of the Galactic Center obtained with the Keck telescopes have spatially resolved all of the Northern Arm sources; enigmatic objects that have previously eluded classification due to their featureless near-infrared spectra. Models of their azimuthally averaged radial profiles and SEDs reveal that they are centrally heated stellar sources surrounded by geometrically thin dust distributions. The images of IRS 1W, 5, 8 and 10W show that these sources are surrounded by a distinct asymmetric dust structure indicative of bowshock. A comparison of the observed near-infrared sizes of the remaining Northern Arm sources to their expected bowshock standoff distances, derived using the observed proper motion of the near-infrared source and the modeled proper motion of the Northern Arm material, suggest that these sources must have winds of at least 1000 km/s; thus they are windy, massive stars embedded within the infalling Northern Arm. Despite the lack of observed photospheric emission, the bowshock morphology of these sources allows us to definitively identify them as late type Wolf-Rayet (WCL) stars similar to the distinct central parsec population of stars previously identified through broad He I emission lines by Paumard et al. The large near-infrared sizes distinguish the Northern Arm sources from other sources with similar large H-K colors found both in the central parsec (IRS 3, 7, 29N and 6E) and nearby Quintuplet cluster. Those sources not associated with the Northern Arm are most probably also late type Wolf-Rayet stars which simply lack the high density of surrounding diffuse material to create a bowshock. The addition of the sources within the sample for this thesis significantly increases the total population of massive, He I emission line stars found within the central parsec and Quintuplet cluster. This increased population should be taken into account in future theories toward the recent formation and/or migration of stars into the central parsec. The Northern Arm sources provide a very powerful tool in understanding the dynamics of the He I emission-line star population since we are able to solve for all six of their phase space parameters. Additional observations of these sources is warranted to confirm their spectral types and get a complete sample of their proper motions and radial velocities.
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