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Galaksi Kümelerinde Küme İçi Gazın X-Işın Özelliklerinin İncelenmesi ile Kümelerin Dinamiksel Durumunu Belirleme ve Sınıflandırma
Yapucu, Zahide; Ikis Gün, Gülnur
Bu çalışmada, A0961, A2108, A3390 ve A3854 galaksi kümelerinin, XMM-Newton uydusu X-ışın gözlem verileri kullanılarak küme içi gazın X-ışın özellikleri incelenmiştir. Galaksi kümelerinin her biri için 0.4 - 7.2 keV enerji aralığında oluşturulan MOS1, MOS2 ve PN verileri birleştirilerek EPIC görüntüleri oluşturulmuştur. Galaksi kümelerinin dinamiks…
Extending time-series models for irregular observational gaps with a moving average structure for astronomical sequences
Elorrieta, F.; Eyheramendy, S.; Palma, W. +1 more
In this study, we introduce a novel moving-average model for analyzing stationary time-series observed irregularly in time. The process is strictly stationary and ergodic under normality and weakly stationary when normality is not assumed. Maximum likelihood (ML) estimation can be efficiently carried out through a Kalman algorithm obtained from th…
Infrared polarisation study of Lynds 1340: A case of RNO 8
Ganesh, Shashikiran; Rai, Archita
This paper describes the polarisation study of a Lynds cloud, LDN 1340,
Geometric Calibration of the ESA Mars Express Orbiter High Resolution Stereo Camera
Li, D.; Li, J.; Liu, W. +3 more
The high-resolution stereo camera mounted on the Mars Express (MEX) spacecraft of the European Space Agency is specifically designed for planetary photogrammetry and mapping missions. High-precision geometric calibration is required to maintain the geometric quality of satellite imaging. This study aimed to develop a Martian geometric calibration …
TFAW survey II: six newly validated planets and 13 planet candidates from K2
Tokovinin, A.; Dyachenko, V.; del Ser, D. +7 more
Searching for Earth-sized planets in data from Kepler's extended mission (K2) is a niche that still remains to be fully exploited. The TFAW survey is an ongoing project that aims to re-analyse all light curves in K2 C1-C8 and C12-C18 campaigns with a wavelet-based detrending and denoising method, and the period search algorithm TLS to search for n…
Solar source longitudinal dependence of SEPs and their association with solar flares and radio-loud CMEs
Moon, Y. -J.; Pappa Kalaivani, P.; Prakash, O. +4 more
In this article we examine the occurrence probability of 104 major (
Probing the nature of the X-ray source IGR J16327-4940 with Chandra
Sidoli, L.; Esposito, P.; Postnov, K. +3 more
We report on the results of a Chandra observation of the source IGR J16327-4940, suggested to be a high-mass X-ray binary hosting a luminous blue variable star (LBV). The source field was imaged by ACIS-I in 2023 to search for X-ray emission from the LBV star and eventually confirm this association. No X-ray emission is detected from the LBV star,…
New and Improved Lyα Reconstructions for M and K Dwarfs
Loyd, R. O. Parke; France, Kevin; Youngblood, Allison +1 more
The Lyα emission line is the brightest UV emission line in M and K dwarf spectra and serves as an important tool for studies of stellar chromospheres, the interstellar medium, and exoplanet atmospheres. However, Lyα observations have proven difficult due to the strong absorption by the interstellar medium, necessitating a reconstruction of the int…
Morphology of the north-western wall of Eos Chaos, Valles Marineris: Evidence for glaciation during late Amazonian high obliquity
Rajesh, V. J.; Sajinkumar, K. S.; Kakkassery, Asif Iqbal
Glacial landforms have been reported from various regions on Mars; most notably from the mid-to-high latitude regions. We studied Eos Chaos, located towards the eastern boundary of Valles Marineris, for the possible glacial processes occurring in the low-latitude areas on Mars. A thorough investigation of the morphology of the north-western wall o…
Gaia Çağında İnce Disk Yıldızlarının Galaksi Model Parametrelerinin Tayini
TUNÇEL GÜÇTEKİN, Sabiha; AK, Serap; BİLİR, Selçuk
Bu çalışmada Güneş civarında farklı mutlak parlaklık aralığındaki ince disk anakol yıldızlarının Galaktik model parametrelerinin hesaplanması hedeflenmiştir. Gaia EDR3 kataloğundan Güneş'e 1 kpc uzaklıkta bulunan rölatif paralaks hatası 0.1'den küçük 41.9 milyon yıldız seçilmiştir. Seçilen yıldızlar renk-parlaklık diyagramı üzerinde ince disk popü…