Zobrazeno 1 - 10
of 1 508
pro vyhledávání: '"A. Sarajedini"'
We present the results from a study of ~9,600 Broad-Line selected AGN with host galaxies detected from the Sloan Digital Sky Survey Data Release 17 (SDSS DR17). We compute ensemble variability statistics based on the comparison of the original SDSS p
Externí odkaz:
http://arxiv.org/abs/2405.13148
A detailed analysis of ground-based CCD UBV photometry and space-based Gaia Data Release 3 (DR3) data for the open clusters King 6 and NGC 1605 was performed. Using the pyUPMASK algorithm on Gaia astrometric data to estimate cluster membership probab
Externí odkaz:
http://arxiv.org/abs/2311.00054
Autor:
Dage, Kristen C., Usher, Christopher, Sobeck, Jennifer, Santos, Ana L. Chies, Szabó, Róbert, Reina-Campos, Marta, Girardi, Léo, Ripepi, Vincenzo, Di Criscienzo, Marcella, Sarajedini, Ata, Clarkson, Will, McGehee, Peregrine, Gizis, John, Rhode, Katherine, Blakeslee, John, Cantiello, Michele, Theissen, Christopher A., Calamida, Annalisa, Ennis, Ana, Chamba, Nushkia, Gerasimov, Roman, Rich, R. Michael, Barmby, Pauline, Ferguson, Annette M. N., Williams, Benjamin F.
The Nancy Grace Roman Telescope's High Latitude Wide Area Survey will have a number of synergies with the Vera Rubin Observatory's Legacy Survey of Space and Time (LSST), particularly for extragalactic star clusters. Understanding the nature of star
Externí odkaz:
http://arxiv.org/abs/2306.12620
Autor:
Libralato, M., Vesperini, E., Bellini, A., Milone, A. P., van der Marel, R. P., Piotto, G., Anderson, J., Aparicio, A., Barbuy, B., Bedin, L. R., Brown, T. M., Cassisi, S., Nardiello, D., Sarajedini, A., Scalco, M.
Our understanding of the kinematic properties of multiple stellar populations (mPOPs) in Galactic globular clusters (GCs) is still limited compared to what we know about their chemical and photometric characteristics. Such limitation arises from the
Externí odkaz:
http://arxiv.org/abs/2301.04148
Autor:
Vargas, C., Villanova, S., Geisler, D., Muñoz, C., Monaco, L., O'Connell, J., Sarajedini, Ata
NGC 362 is a non-common Type II Galactic globular cluster, showing a complex pseudo two-color diagram or 'chromosome map'. The clear separation of its stellar populations in the color-magnitude diagram and the distribution of the giant stars in the c
Externí odkaz:
http://arxiv.org/abs/2207.05693
Autor:
Libralato, M., Bellini, A., Vesperini, E., Piotto, G., Milone, A. P., van der Marel, R. P., Anderson, J., Aparicio, A., Barbuy, B., Bedin, L. R., Borsato, L., Cassisi, S., Dalessandro, E., Ferraro, F. R., King, I. R., Lanzoni, B., Nardiello, D., Ortolani, S., Sarajedini, A., Sohn, S. T.
A number of studies based on data collected by the $\textit{Hubble Space Telescope}$ ($\textit{HST}$) GO-13297 program "HST Legacy Survey of Galactic Globular Clusters: Shedding UV Light on Their Populations and Formation" have investigated the photo
Externí odkaz:
http://arxiv.org/abs/2206.09924
Autor:
Sarajedini, Ata
We present a purely differential line-of-sight distance between M31 and M33 using ab-type RR Lyrae variables observed in each galaxy by the Hubble Space Telescope Advanced Camera for Surveys in the F606W filter. Using 1501 RR Lyraes in 13 M31 fields
Externí odkaz:
http://arxiv.org/abs/2109.10853
Autor:
Muñoz, César, Geisler, Douglas, Villanova, Sandro, Sarajedini, Ata, Frelijj, Heinz, Vargas, Carolina, Monaco, Lorenzo, O'Connell, Julia
Globular Clusters (GCs) are now well known to almost universally show multiple popu-lations (MPs). The HST UV Legacy Survey of a large number of Galactic GCs in UV filters optimized to explore MPs finds that a small fraction of GCs, termed Type II, a
Externí odkaz:
http://arxiv.org/abs/2106.15052
We present a long temporal baseline variability survey in the Frontier Field MACSJ1149. In this study, we identify active galactic nuclei (AGNs) and other transient sources via their variability using over a decade of Hubble Space Telescope (HST) ima
Externí odkaz:
http://arxiv.org/abs/2003.11035
Autor:
Gilligan, Christina K., Chaboyer, Brian, Cummings, Jeffrey D., Mackey, Dougal, Cohen, Roger E., Geisler, Douglas, Grocholski, Aaron J., Parisi, M. C., Sarajedini, Ata, Ventura, Paolo, Villanova, Sandro, Yang, Soung-Chul
We examine four ancient Large Magellanic Cloud (LMC) globular clusters (GCs) for evidence of multiple stellar populations using the Advanced Camera for Surveys and Wide Field Camera 3 on the Hubble Space Telescope Programme GO-14164. NGC 1466, NGC 18
Externí odkaz:
http://arxiv.org/abs/2003.09473