SiO Maser Survey of the Inner Bar of the Galactic Bulge

Abstract

Abstract We surveyed 291 MSX/2 MASS infrared objects in the $7^{\circ} \!\times 2^{\circ}$ area of the galactic center in the 43 GHz SiO $J = 1 \hbox{--} 0 v=1$ and 2 maser lines, obtaining accurate radial velocities of 163 detected objects. The surveyed area is the region where the IRAS catalog is incomplete due to contamination by high source density. The objects in the present MSX/2 MASS sample were chosen to have similar infrared characteristics to those of the previous SiO-maser-survey samples based on the color-selected IRAS sources. The sampling based on the 2 MASS catalog causes a bias to the foreside objects of the bulge due to heavy obscuration by interstellar dust; the detections considerably leaned on the $V_{\mathrm{lsr}}<0$ side. The $l \hbox{--} V$ diagram reveals two conspicuous features, which were not present or tenuous in the previous studies: one feature indicating a linear velocity increase with longitude with $\vert l\vert < {1\rlap {.}{}^{\mathrm {\circ }}5}$, which is likely to be associated with the inner bar, and the other feature having considerably eccentric velocities, more than those of the normal $x_1$-orbit family feature. The extinction-corrected $K$ magnitudes (if used as a distance modulus) tend to show a sequential deposition of these objects along the line of sight toward the galactic center, depending on their radial velocities. The tendency that appeared in the distance measures is consistent with the bulge–bar dynamical model utilizing the periodic orbit families in the bar potential.