24 hasil untuk "Burçin Mutlu-Pakdil"
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Artikel Jurnal
All Puffed Up: Exploring Ultra-diffuse Galaxy Origins Through Galaxy Interactions
We present new follow-up observations of two ultra-diffuse galaxies (UDGs) selected for their distorted morphologies and tidal features, suggestive of tidal influence. Using Hubble Space Telescope Advanced Camera for Surveys F555W and F814W imaging, we identify 8 ± 2 globular clusters in KUG…
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Artikel Jurnal
The Disturbed and Globular-cluster-rich Ultradiffuse Galaxy UGC 9050-Dw1
We investigate the ultradiffuse galaxy (UDG) UGC 9050-Dw1, which was selected because of its disturbed morphology as part of a larger sample of UDGs that display evidence for significant interactions. We use the Hubble Space Telescope’s Advanced Camera for Surveys to identify globular clusters…
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Artikel Jurnal
Gas-rich, Field Ultra-diffuse Galaxies Host Few Gobular Clusters
We present Hubble Space Telescope imaging of 14 gas-rich, low-surface-brightness galaxies in the field at distances of 25–36 Mpc, with mean effective radii and g -band central surface brightnesses of 1.9 kpc and 24.2 mag arcsec ^−2 . Nine meet the standard criteria to be considered ultra-diffuse…
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Artikel Jurnal
Pavo: Discovery of a Star-forming Dwarf Galaxy Just Outside the Local Group
We report the discovery of Pavo, a faint ( M _V = −10.0), star-forming, irregular, and extremely isolated dwarf galaxy at D ≈ 2 Mpc. Pavo was identified in Dark Energy Camera Legacy Survey imaging via a novel approach that combines low surface brightness galaxy search algorithms and…
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Artikel Jurnal
Corvus A: A Low-mass, Isolated Galaxy at 3.5 Mpc
We report the discovery of Corvus A, a low-mass, gas-rich galaxy at a distance of approximately 3.5 Mpc, identified in DR10 of the Dark Energy Camera Legacy Imaging Survey during the initial phase of our ongoing SEmi-Automated Machine LEarning Search for Semi-resolved galaxies (SEAMLESS). Jansky…
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Artikel Jurnal
Dark No More: The Low-luminosity Stellar Counterpart of a Dark Cloud in the Virgo Cluster
We have discovered the stellar counterpart to the ALFALFA Virgo 7 cloud complex, which has been thought to be optically dark and nearly star-free since its discovery in 2007. This ∼190 kpc long chain of enormous atomic gas clouds ( M _H _i ∼ 10 ^9 M _⊙ ) is embedded in the hot intracluster medium…
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Artikel Jurnal
Gas and Star Formation in Satellites of Milky Way Analogs
We have imaged the entirety of eight (plus one partial) Milky Way (MW)–like satellite systems, a total of 42 (45) satellites, from the Satellites Around Galactic Analogs II catalog in both H α and H i with the Canada–France–Hawaii Telescope and the Jansky Very Large Array. In these eight systems we…
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Artikel Jurnal
Star Formation Histories and Gas Content Limits of Three Ultra-faint Dwarfs on the Periphery of M31
We present Hubble Space Telescope (HST) imaging of Pegasus V and Pisces VII, along with a re-analysis of the archival imaging of Pegasus W, and Karl Jansky Very Large Array (VLA) neutral gas (H i ) observations of all three. These three ultra-faint dwarfs (UFDs) are all within the Local Group in…
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Artikel Jurnal
Identifying Dwarfs of MC Analog GalaxiEs (ID-MAGE): The Search for Satellites around Low-mass Hosts
We present results from Identifying Dwarfs of MC Analog GalaxiEs (ID-MAGE), a survey aimed at identifying and characterizing unresolved satellite galaxies around 35 nearby LMC- and SMC-mass hosts ( D = 4−10 Mpc). We use archival DESI Legacy Survey imaging data and perform an extensive search for…
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Artikel Jurnal
The Faint Satellite System of NGC 253: Insights into Low-density Environments and No Satellite Plane
We have conducted a systematic search around the Milky Way (MW) analog NGC 253 ( D = 3.5 Mpc), as a part of the Panoramic Imaging Survey of Centaurus and Sculptor (PISCeS)—a Magellan+Megacam survey to identify dwarfs and other substructures in resolved stellar light around MW-mass galaxies outside…
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Artikel Jurnal
A Census of Dwarf Galaxy Satellites around LMC-mass Galaxy NGC 2403
We present the first comprehensive census of the satellite population around a Large Magellanic Cloud stellar-mass galaxy, as part of the Magellanic Analog Dwarf Companions and Stellar Halos (MADCASH) survey. We have surveyed NGC 2403 ( D = 3.0 Mpc) with the Subaru/Hyper Suprime-Cam imager out to a…
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Artikel Jurnal
Pavo: Stellar Feedback in Action in a Low-mass Dwarf Galaxy
MeerKAT observations of the recently discovered, extremely low mass galaxy Pavo have revealed a neutral gas (H i ) reservoir that was undetected in archival H i single dish data. We measure Pavo’s H i mass as ${\mathrm{log}}\,{M}_{{\mathrm{HI}}}/{M}_{\odot }=5.79\pm 0.05$ , making it the lowest…
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Artikel Jurnal
Hubble Space Telescope Imaging of Three Isolated Faint Dwarf Galaxies beyond the Local Group: Pavo, Corvus A, and Kamino
We present new Hubble Space Telescope (HST) imaging of three recently discovered star-forming dwarf galaxies beyond the Local Group: Pavo, Corvus A, and Kamino. The discovery of Kamino is reported here for the first time. They rank among the most isolated faint dwarf galaxies known; hence they…
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Artikel Jurnal
Three Quenched, Faint Dwarf Galaxies in the Direction of NGC 300: New Probes of Reionization and Internal Feedback
We report the discovery of three faint and ultrafaint dwarf galaxies—Sculptor A, Sculptor B, and Sculptor C—in the direction of NGC 300 ( D = 2.0 Mpc), a Large Magellanic Cloud–mass galaxy. Deep ground-based imaging with Gemini/GMOS resolves all three dwarf galaxies into stars, each displaying a…
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Artikel Jurnal
Deep Photometric Observations of Ultrafaint Milky Way Satellites Centaurus I and Eridanus IV
We present deep Magellan+Megacam imaging of Centaurus I (Cen I) and Eridanus IV (Eri IV), two recently discovered Milky Way ultrafaint satellites. Our data reach ∼2–3 mag deeper than the discovery data from the DECam Local Volume Exploration Survey. We use these data to constrain their distances…
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Artikel Jurnal
Not-so-heavy Metal(s): Chemical Abundances in the Ultrafaint Dwarf Galaxies Eridanus IV and Centaurus I
We present detailed chemical abundances of the brightest star in each of the ultrafaint dwarf galaxies Eridanus IV and Centaurus I using high-resolution Magellan/MIKE spectroscopy. The brightest star in Centaurus I, CenI-5136, is a very metal-poor star with metallicity [Fe/H] = −2.52 ± 0.17 and…
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Artikel Jurnal
The DECam MAGIC Survey: Spectroscopic Follow-up of the Most Metal-poor Stars in the Distant Milky Way Halo
In this work, we present high-resolution spectroscopic observations for six metal-poor stars with [Fe/H] < –3 (including one with [Fe/H] < –4), selected using narrowband Ca ii HK photometry from the DECam MAGIC Survey. The spectroscopic data confirm the accuracy of the photometric metallicities and…
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Artikel Jurnal
DELVE-DEEP Survey: The Faint Satellite System of NGC 55
We report the first comprehensive census of the satellite dwarf galaxies around NGC 55 (2.1 Mpc) as a part of the DECam Local Volume Exploration DEEP (DELVE-DEEP) survey. NGC 55 is one of four isolated, Magellanic analogs in the Local Volume around which DELVE-DEEP aims to identify faint dwarfs and…
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Artikel Jurnal
The DELVE Quadruple Quasar Search. I. A Lensed Low-luminosity Active Galactic Nucleus
A quadruply lensed source, J125856.3–031944, has been discovered using the DELVE survey and Wide-field Infrared Survey Explorer W1–W2 colors. Follow-up direct imaging carried out with the Magellan Baade 6.5 m telescope is analyzed, as is spectroscopy from the 2.5 m Nordic Optical Telescope. The…