A Distinct Structure inside the Galactic Bar

@article{Nishiyama2005ADS,
  title={A Distinct Structure inside the Galactic Bar},
  author={Shogo Nishiyama and Tetsuya Nagata and Daisuke Baba and Yasuaki Haba and Ryota Kadowaki and Daisuke Kato and Mikio Kurita and Chie Nagashima and Takahiro Nagayama and Yuka Murai and Yasushi Nakajima and Motohide Tamura and Hidehiko Nakaya and Koji Sugitani and Takahiro Naoi and Noriyuki Matsunaga and Toshihiko Tanab{\'e} and Nobuhiko Kusakabe and Shuji Sato},
  journal={The Astrophysical Journal Letters},
  year={2005},
  volume={621},
  pages={L105 - L108}
}
We present the result of a near-infrared (JHKs) survey along the Galactic plane, -10.°5 ≤ l ≤ 10.°5 and b = +1°, with the IRSF 1.4 m telescope and the SIRIUS camera. Ks versus H - Ks color-magnitude diagrams reveal a well-defined population of red clump stars whose apparent magnitude peak changes continuously along the Galactic plane, from Ks = 13.4 at l = -10° to Ks = 12.2 at l = 10° after dereddening. This variation can be explained by the barlike structure found in previous studies, but we… 

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References

SHOWING 1-10 OF 35 REFERENCES

Modelling the Galactic Bar using Red Clump Stars

The color-magnitude diagrams of ~ 1 × 10 6 stars obtained for 19 fields towards the Galactic bulge with the OGLE project reveal a well-defined population of bulge red clump stars. We found that the

The Metallicity and Reddening of Stars in the Inner Galactic Bulge

We present a preliminary analysis of K, J-K color-magnitude diagrams (CMDs) for seven different positions on or close to the minor axis of the Milky Way at Galactic latitudes between +0.°1 and -2.°8.

Modeling the Galactic Bar Using Red Clump Giants

The color-magnitude diagrams of ~7 × 105 stars obtained for 12 fields across the Galactic bulge with the Optical Gravitational Lensing Experiment project reveal a well-defined population of bulge red

Another bar in the Bulge

A map of the projected density of the old stellar population of the Galactic Bulge region is reconstructed using 2MASS data. By making a combination of the H and K photometric bands, it is possible

A Molecular Face‐on View of the Galactic Center Region

We present a method to derive positions of molecular clouds along the lines of sight from a comparison between 2.6 mm CO emission lines and 18 cm OH absorption lines, and apply it to the central

Metallicity of Red Giants in the Galactic Bulge from Near-Infrared Spectroscopy

We present moderate-resolution (λ/Δλ = 1300–4800) K-band spectra of more than 110 M giants in Galactic bulge fields interior to -4° (560 pc) and as close as within 0.°2 (28 pc) of the Galactic

COLOR-MAGNITUDE DIAGRAM DISTRIBUTION OF THE BULGE RED CLUMP STARS : EVIDENCE FOR THE GALACTIC BAR

The color-magnitude diagrams of $\sim 5\times 10^5$ stars obtained for 13 fields towards the Galactic bulge with the OGLE project reveal a well-defined population of bulge red clump stars. We find

The photometric structure of the inner Galaxy

The light distribution in the inner few kiloparsecs of the Milky Way is recovered non­ parametrically from a dust-corrected near-infrared COBEIDIRBE surface brightness map of the inner Galaxy. The

Infrared stellar populations in the central parts of the Milky Way galaxy

Near- and mid-IR survey data from DENIS and ISOGAL are used to investigate the structure and formation history of the inner 10 ◦ (1.4 kpc) of the Milky Way galaxy. Synthetic bolometric corrections

Direct evidence for a bar at the Galactic center

The bar at the center of the Milky Way, long postulated from a number of different studies, is unambiguously detected in the 2.4 μm observations of the Galactic center of Matsumoto et al. We model