Zobrazeno 1 - 10
of 979
pro vyhledávání: '"Globular star clusters"'
Autor:
Christopher D. Matzner
Publikováno v:
The Astrophysical Journal Letters, Vol 975, Iss 1, p L17 (2024)
Within the birth environment of a massive globular cluster, the combination of a luminous young stellar population and a high column density induces a state in which the thermal optical depth and radiation pressure are both appreciable. In this state
Externí odkaz:
https://doaj.org/article/629e45e1657d46feb85ec805bad9dade
Autor:
Yuxiao Wu, Zhichen Pan, Lei Qian, Scott M. Ransom, Ralph P. Eatough, BoJun Wang, Paulo C. C. Freire, Kuo Liu, Zhen Yan, Jintao Luo, Liyun Zhang, Minghui Li, Dejiang Yin, Baoda Li, Yifeng Li, Yinfeng Dai, Yaowei Li, Xinnan Zhang, Tong Liu, Yu Pan
Publikováno v:
The Astrophysical Journal Letters, Vol 974, Iss 2, p L23 (2024)
We present the discovery of three pulsars in the globular cluster (GC) M15 (NGC 7078) by the Five-hundred-meter Aperture Spherical Radio Telescope. PSR J2129+1210J (M15J) is a millisecond pulsar with a spin period of 11.84 ms and a dispersion measure
Externí odkaz:
https://doaj.org/article/72230bd637174a5499cad0c36b04cec0
Autor:
Shi-Jie Gao, Yi-Xuan Shao, Pei Wang, Ping Zhou, Xiang-Dong Li, Lei Zhang, Joseph W. Kania, Duncan R. Lorimer, Di Li
Publikováno v:
The Astrophysical Journal Letters, Vol 974, Iss 1, p L2 (2024)
Observations show that globular clusters (GCs) might be among the best places to find millisecond pulsars (MSPs). However, the GC Terzan 6 seems to be an exception without any pulsar discovered, although its high stellar encounter rate suggests that
Externí odkaz:
https://doaj.org/article/b5c9e0eebfeb4125a96000bba89c016a
Autor:
Adam J. Burgasser, Roman Gerasimov, Kyle Kremer, Hunter Brooks, Efrain Alvarado III, Adam C. Schneider, Aaron M. Meisner, Christopher A. Theissen, Emma Softich, Preethi Karpoor, Thomas P. Bickle, Martin Kabatnik, Austin Rothermich, Dan Caselden, J. Davy Kirkpatrick, Jacqueline K. Faherty, Sarah L. Casewell, Marc J. Kuchner, The Backyard Worlds: Planet 9 Collaboration
Publikováno v:
The Astrophysical Journal Letters, Vol 971, Iss 1, p L25 (2024)
We report the discovery of a high-velocity, very low-mass star or brown dwarf whose kinematics suggest it is unbound to the Milky Way. CWISE J124909.08+362116.0 was identified by citizen scientists in the Backyard Worlds: Planet 9 program as a high-p
Externí odkaz:
https://doaj.org/article/4986ac695b8943b2b4bcb6950e377b9b
Publikováno v:
The Astrophysical Journal Letters, Vol 971, Iss 1, p L4 (2024)
We search for globular clusters (GCs) trapped in resonances with the bar of the Milky Way (MW). By integrating their orbits in a potential with a decelerating bar, we select 10 whose orbits are significantly changed by its presence. Most of these are
Externí odkaz:
https://doaj.org/article/f9ff194c19d04f3e981f4a87a32cd195
Autor:
Dejiang Yin, Li-yun Zhang, Lei Qian, Ralph P. Eatough, Baoda Li, Duncan R. Lorimer, Yinfeng Dai, Yaowei Li, Xingnan Zhang, Minghui Li, Tianhao Su, Yuxiao Wu, Yu Pan, Yujie Lian, Tong Liu, Zhen Yan, Zhichen Pan
Publikováno v:
The Astrophysical Journal Letters, Vol 969, Iss 1, p L7 (2024)
We present the discovery of eight isolated millisecond pulsars in globular cluster (GC) NGC 6517 using the Five-hundred-meter Aperture Spherical radio Telescope (FAST). The spin periods of those pulsars (namely PSR J1801–0857K to R, or NGC 6517K to
Externí odkaz:
https://doaj.org/article/5e817d8e00bd4870af2d09624e4fdd0e
Autor:
A. F. Marino, A. P. Milone, A. Renzini, E. Dondoglio, E. Bortolan, M. G. Carlos, G. Cordoni, A. Dotter, S. Jang, E. P. Lagioia, M. V. Legnardi, F. Muratore, A. Mohandasan, M. Tailo, T. Ziliotto
Publikováno v:
The Astrophysical Journal Letters, Vol 969, Iss 1, p L8 (2024)
We present the first spectroscopic estimates of the chemical abundance of M dwarf stars in a globular cluster (GC), namely 47 Tucanae. By exploiting NIRSpec on board the James Webb Space Telescope, we gathered low-resolution spectra for 28 stars with
Externí odkaz:
https://doaj.org/article/bdbe503d533a42aba2a4872e667e22c2
Autor:
Jessica M. Berkheimer, Timothy Carleton, Rogier A. Windhorst, William C. Keel, Benne W. Holwerda, Mario Nonino, Seth H. Cohen, Rolf A. Jansen, Dan Coe, Christopher J. Conselice, Simon P. Driver, Brenda L. Frye, Norman A. Grogin, Anton M. Koekemoer, Ray A. Lucas, Madeline A. Marshall, Nor Pirzkal, Clayton Robertson, Aaron Robotham, Russell E. Ryan Jr., Brent M. Smith, Jake Summers, Scott Tompkins, Christopher N. A. Willmer, Haojing Yan
Publikováno v:
The Astrophysical Journal Letters, Vol 964, Iss 2, p L29 (2024)
James Webb Space Telescope NIRCam images have revealed 154 reliable globular cluster (GC) candidates around the z = 0.0513 elliptical galaxy VV 191a after subtracting 34 likely interlopers from background galaxies inside our search area. NIRCam broad
Externí odkaz:
https://doaj.org/article/dd2bbfb8c479403f8e67992f6b5c7fe0
Publikováno v:
The Astrophysical Journal Letters, Vol 964, Iss 2, p L20 (2024)
Based on the current detectable cataclysmic variable (CV) population in Galactic globular clusters (GCs), we show that there is not a clear relation between the number of sources per unit of mass and the stellar encounter rate, the cluster mass, or t
Externí odkaz:
https://doaj.org/article/eab626f1f92b4cc88842b86016b5d9eb
Publikováno v:
The Astrophysical Journal, Vol 976, Iss 1, p 54 (2024)
Thin stellar streams originating from globular clusters (GCs) are among the most sensitive tracers of low-mass dark matter subhalos. Joint analysis of the entire population of stellar streams will place the most robust constraints on the dark matter
Externí odkaz:
https://doaj.org/article/c8117d731adf4f2ba9e4d6a9448f61c2