Zobrazeno 1 - 10
of 51
pro vyhledávání: '"Simion, Iulia T."'
Autor:
Kunder, Andrea, Prudil, Zdenek, Covey, Kevin, Hughes, Joanne, Joyce, Meridith, Simion, Iulia T., Kuss, Rebekah, Campos, Carlos, Johnson, Christian I., Pilachowski, Catherine A., Larson, Kristen A., Koch-Hansen, Andreas J., Marchetti, Tommaso, Rich, Michael R., Butler, Evan, Clarkson, William I., Rivet, Michael J., Devine, Kathryn, Vivas, A. Katherina, Perren, Gabriel I., Soto, Mario, Silva, Erika
The Milky Way Bulge extra-tidal star survey (MWBest) is a spectroscopic survey with the goal of identifying stripped globular cluster stars from inner Galaxy clusters. In this way, an indication of the fraction of metal-poor bulge stars that originat
Externí odkaz:
http://arxiv.org/abs/2310.18575
Autor:
Marchetti, Tommaso, Joyce, Meridith, Johnson, Christian, Rich, R. Michael, Clarkson, William, Kunder, Andrea, Simion, Iulia T., Pilachowski, Catherine A.
The Blanco DECam Bulge Survey (BDBS) provides near-ultraviolet to near-infrared photometry for ~250 million unique stars. By combining BDBS photometry with the latest Gaia astrometry, we characterize the chemo-dynamics of red clump stars across the B
Externí odkaz:
http://arxiv.org/abs/2310.17542
Autor:
Johnson, Christian I., Rich, R. Michael, Simion, Iulia T., Young, Michael D., Clarkson, William I., Pilachowski, Catherine A., Michael, Scott, Marchetti, Tommaso, Soto, Mario, Kunder, Andrea, Koch-Hansen, Andreas J., Vivas, A. Katherina, Joyce, Meridith, Shen, Juntai, Osmond, Alexis
We present photometric metallicity measurements for a sample of 2.6 million bulge red clump stars extracted from the Blanco DECam Bulge Survey (BDBS). Similar to previous studies, we find that the bulge exhibits a strong vertical metallicity gradient
Externí odkaz:
http://arxiv.org/abs/2206.14851
Autor:
Lim, Dongwook, Koch-Hansen, Andreas J., Chung, Chul, Johnson, Christian I., Kunder, Andrea, Simion, Iulia T., Rich, R. Michael, Clarkson, William I., Pilachowski, Catherine A., Michael, Scott, Vivas, A. Katherina, Young, Michael D.
Publikováno v:
A&A 647, A34 (2021)
Red clump (RC) stars are one of the best stellar tracers of the structure of the Milky Way (MW) bulge. Here we report a new view of the double RC through luminosity and color distributions of RC stars in nine bulge fields ($l$ = 0.0$^{\circ}$, $\pm$4
Externí odkaz:
http://arxiv.org/abs/2101.06269
Autor:
Simion, Iulia T., Shen, Juntai, Koposov, Sergey E., Ness, Melissa, Freeman, Kenneth, Bland-Hawthorn, Jonathan, Lewis, Geraint F.
Until the recent advent of $Gaia$ Data Release 2 (DR2) and deep multi-object spectroscopy, it has been difficult to obtain 6-D phase space information for large numbers of stars beyond 4 kpc, in particular towards the Galactic centre, where dust and
Externí odkaz:
http://arxiv.org/abs/2011.13905
Autor:
Erkal, Denis, Deason, Alis J., Belokurov, Vasily, Xue, Xiang-Xiang, Koposov, Sergey E., Bird, Sarah A., Liu, Chao, Simion, Iulia T., Yang, Chengqun, Zhang, Lan, Zhao, Gang
A wealth of recent studies have shown that the LMC is likely massive, with a halo mass $>10^{11} M_\odot$. One consequence of having such a nearby and massive neighbour is that the inner Milky Way is expected to be accelerated with respect to our Gal
Externí odkaz:
http://arxiv.org/abs/2010.13789
Autor:
Johnson, Christian I., Rich, R. Michael, Young, Michael D., Simion, Iulia T., Clarkson, William I., Pilachowski, Catherine A., Michael, Scott, Kunder, Andrea, Koch, Andreas, Vivas, A. Katherina
The Blanco DECam Bulge Survey (BDBS) imaged more than 200 square degrees of the Southern Galactic bulge using the ugrizY filters of the Dark Energy Camera, and produced point spread function photometry of approximately 250 million unique sources. In
Externí odkaz:
http://arxiv.org/abs/2008.09257
Autor:
Chang, Jiang, Yuan, Zhen, Xue, Xiang-Xiang, Simion, Iulia T., Kang, Xi, Li, Ting S., Zhao, Jing-Kun, Zhao, Gang
A large number of new members ($\sim$150) of the Cetus Stream (CS) were identified from their clustering features in dynamical space using 6D kinematic data by combining LAMOST DR5 and Gaia DR2 surveys. They map a diffuse structure that extends over
Externí odkaz:
http://arxiv.org/abs/2003.02378
We use a sample of ~350 RR Lyrae stars with radial velocities and Gaia DR2 proper motions to study orbital properties of the Hercules-Aquila Cloud (HAC) and Virgo Over-density (VOD). We demonstrate that both structures are dominated by stars on highl
Externí odkaz:
http://arxiv.org/abs/1807.01335
Autor:
Simion, Iulia T., Belokurov, Vasily, Koposov, Sergey E., Sheffield, Allyson, Johnston, Kathryn V.
We designed a follow-up program to find the spectroscopic properties of the Hercules-Aquila Cloud (HAC) and test scenarios for its formation. We measured the radial velocities (RVs) of 45 RR Lyrae in the southern portion of the HAC using the faciliti
Externí odkaz:
http://arxiv.org/abs/1803.05918