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Research paper thumbnail of Search for Extremely Metal-Poor Stars with GEMINI-N/GRACES I. Chemical-Abundance Analysis

arXiv (Cornell University), Jan 15, 2023

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Research paper thumbnail of Exploring the nature and synchronicity of early cluster formation in the Local Group

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Research paper thumbnail of Close Relationship in Color Between Host and Satellite Galaxies in WHL 085910.0+294957, a Galaxy Cluster at z = 0.30

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Research paper thumbnail of Greater cellular stiffness in fibroblasts from patients with idiopathic pulmonary fibrosis

American journal of physiology. Lung cellular and molecular physiology, 2018

Idiopathic pulmonary fibrosis (IPF) is a lethal lung disease involving degenerative breathing cap... more Idiopathic pulmonary fibrosis (IPF) is a lethal lung disease involving degenerative breathing capacity. Fibrotic disease is driven by dysregulation in mechanical forces at the organ, tissue, and cellular level. While it is known that, in certain pathologies, diseased cells are stiffer than healthy cells, it is not known if fibroblasts derived from patients with IPF are stiffer than their normal counterparts. Using IPF patient-derived cell cultures, we measured the stiffness of individual lung fibroblasts via high-resolution force maps using atomic force microscopy. Fibroblasts from patients with IPF were stiffer and had an augmented cytoskeletal response to transforming growth factor-β1 compared with fibroblasts from donors without IPF. The results from this novel study indicate that the increased stiffness of lung fibroblasts of IPF patients may contribute to the increased rigidity of fibrotic lung tissue.

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Research paper thumbnail of RR Lyrae Variables in M33: two new fields and an analysis of the galaxy’s population

Monthly Notices of the Royal Astronomical Society, 2017

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Research paper thumbnail of RR Lyrae Variable Stars in the Local Group Spiral Galaxy, M33 : Signatures of Oosterhoff Type I Properties

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Research paper thumbnail of The Properties of RR Lyrae Variables in M33

We present the results of an extensive survey of RR Lyrae stars in three fields along the major a... more We present the results of an extensive survey of RR Lyrae stars in three fields along the major axis of the Triangulum Galaxy (M33). From images taken with the Advanced Camera for Surveys (ACS) Wide Field Channel (WFC) on-board the Hubble Space Telescope (HST) through two passbands (F606W and F814W), we have identified and characterized a total of 119 RR Lyrae variables (96 RRab (RR0) and 23 RRc(RR1)) in M33. Using the properties of 83 RR Lyrae stars (65 RRab and 18 RRc) in the innermost ACS field (hereafter DISK2), we find mean periods of = 0.553 ± 0.008 (error1) ± 0.05 (error2) and = 0.325 ± 0.008 (error1) ± 0.05 (error2), where the `error1' value represents the standard error of the mean and the `error2' value is based on the error of an individual RRL period calculated from our synthetic light curve simulations. The distribution of RRab periods and the frequency of RRc stars (Nc=n(c)/n(abc)=0.22) strongly suggest that these RR Lyraes follow the general characteristics of...

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Research paper thumbnail of MEASURABLE RELATIONSHIP BETWEEN BRIGHT GALAXIES AND THEIR FAINT COMPANIONS IN WHL J085910.0+294957, A GALAXY CLUSTER AT z = 0.30: VESTIGES OF INFALLEN GROUPS?

The Astrophysical Journal, 2014

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Research paper thumbnail of The Early Chemical Enrichment Histories of Two Sculptor Group Dwarf Galaxies as Revealed by RR Lyrae Variables

The Astrophysical Journal, 2014

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Research paper thumbnail of The RR Lyrae Variable Population in the Phoenix Dwarf Galaxy

The Astrophysical Journal, 2014

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Research paper thumbnail of Globular Clusters in the Outer Galactic Halo: AM-1 and Palomar 14

The Astronomical Journal, 2008

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Research paper thumbnail of Wiyn Open Cluster Study II: Wide-Field CCD Photometry of the Old Open Cluster NGC 6819

The Astrophysical Journal, 2012

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Research paper thumbnail of 1.11. A photometric study of two galactic bulge globular clusters

Symposium - International Astronomical Union, 1998

We present a comparative study of two metal-rich globular clusters in the Galactic bulge, NGC 631... more We present a comparative study of two metal-rich globular clusters in the Galactic bulge, NGC 6316 and NGC 6624, based on Washington CCD photometry. These two clusters are very close to the Galactic center. NGC 6624 is known to be dynamically in a post-core-collapse stage, while NGC 6316 is not. CMT1T2 CCD images of these clusters were obtained at the CTIO 0.9m telescope. We adopt the reddening values of E(B – V) = 0.61 for NGC 6316 and E(B – V) = 0.26 for NGC 6624 in this study.

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Research paper thumbnail of Exploring the nature and synchronicity of early cluster formation in the Large Magellanic Cloud V: Multiple Populations in ancient Globular Clusters

We examine four ancient Large Magellanic Cloud (LMC) globular clusters (GCs) for evidence of mult... more 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 1841, and NGC 2257 all show evidence for a redder, secondary population along the main-sequence. Reticulum does not show evidence for the presence of a redder population, but this GC has the least number of stars and Monte Carlo simulations indicate that the sample of main sequence stars is too small to robustly infer whether a redder population exists in this cluster. The second, redder, population of the other three clusters constitutes ∼30-40% of the total population along the main-sequence. This brings the total number of ancient LMC GCs with known split or broadened main-sequences to five. However, unlike for Hodge 11 and NGC 2210 (see arXiv:1904.01434), none of the clusters show evidence for multiple populations in the horizontal bra...

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Research paper thumbnail of Accepted to The Astrophysical Journal Preprint typeset using LATEX style emulateapj v. 12/16/11 THE EARLY CHEMICAL ENRICHMENT HISTORIES OF TWO SCULPTOR GROUP DWARF GALAXIES AS

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Research paper thumbnail of Preprint typeset using LATEX style emulateapj v. 12/16/11 WIYN OPEN CLUSTER STUDY LII: WIDE-FIELD CCD PHOTOMETRY OF THE OLD OPEN CLUSTER

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Research paper thumbnail of 8 Accepted by the Astronomical Journal Globular Clusters in the Outer Galactic Halo: AM-1 and

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Research paper thumbnail of VizieR Online Data Catalog: RR Lyrae variables in M33 (Tanakul+, 2017)

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Research paper thumbnail of The Carnegie-Chicago Hubble Program. I. A New Approach to the Distance Ladder Using Only Distance Indicators of Population II

arXiv: Cosmology and Nongalactic Astrophysics, 2016

We present an overview of the Carnegie-Chicago Hubble Program, an ongoing program to obtain a 3 p... more We present an overview of the Carnegie-Chicago Hubble Program, an ongoing program to obtain a 3 per cent measurement of the Hubble constant using alternative methods to the traditional Cepheid distance scale. We aim to establish a completely independent route to the Hubble constant using RR Lyrae variables, the tip of the red giant branch (TRGB), and Type Ia supernovae (SNe Ia). This alternative distance ladder can be applied to galaxies of any Hubble Type, of any inclination, and, utilizing old stars in low density environments, is robust to the degenerate effects of metallicity and interstellar extinction. Given the relatively small number of SNe Ia host galaxies with independently measured distances, these properties provide a great systematic advantage in the measurement of the Hubble constant via the distance ladder. Initially, the accuracy of our value of the Hubble constant will be set by the five Galactic RR Lyrae calibrators with Hubble Space Telescope Fine-Guidance Sensor ...

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Research paper thumbnail of HST Study of ESO 149-G003, a nearby dwarf irregular galaxy

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Research paper thumbnail of Search for Extremely Metal-Poor Stars with GEMINI-N/GRACES I. Chemical-Abundance Analysis

arXiv (Cornell University), Jan 15, 2023

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Research paper thumbnail of Exploring the nature and synchronicity of early cluster formation in the Local Group

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Close Relationship in Color Between Host and Satellite Galaxies in WHL 085910.0+294957, a Galaxy Cluster at z = 0.30

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Greater cellular stiffness in fibroblasts from patients with idiopathic pulmonary fibrosis

American journal of physiology. Lung cellular and molecular physiology, 2018

Idiopathic pulmonary fibrosis (IPF) is a lethal lung disease involving degenerative breathing cap... more Idiopathic pulmonary fibrosis (IPF) is a lethal lung disease involving degenerative breathing capacity. Fibrotic disease is driven by dysregulation in mechanical forces at the organ, tissue, and cellular level. While it is known that, in certain pathologies, diseased cells are stiffer than healthy cells, it is not known if fibroblasts derived from patients with IPF are stiffer than their normal counterparts. Using IPF patient-derived cell cultures, we measured the stiffness of individual lung fibroblasts via high-resolution force maps using atomic force microscopy. Fibroblasts from patients with IPF were stiffer and had an augmented cytoskeletal response to transforming growth factor-β1 compared with fibroblasts from donors without IPF. The results from this novel study indicate that the increased stiffness of lung fibroblasts of IPF patients may contribute to the increased rigidity of fibrotic lung tissue.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of RR Lyrae Variables in M33: two new fields and an analysis of the galaxy’s population

Monthly Notices of the Royal Astronomical Society, 2017

Bookmarks Related papers MentionsView impact

Research paper thumbnail of RR Lyrae Variable Stars in the Local Group Spiral Galaxy, M33 : Signatures of Oosterhoff Type I Properties

Bookmarks Related papers MentionsView impact

Research paper thumbnail of The Properties of RR Lyrae Variables in M33

We present the results of an extensive survey of RR Lyrae stars in three fields along the major a... more We present the results of an extensive survey of RR Lyrae stars in three fields along the major axis of the Triangulum Galaxy (M33). From images taken with the Advanced Camera for Surveys (ACS) Wide Field Channel (WFC) on-board the Hubble Space Telescope (HST) through two passbands (F606W and F814W), we have identified and characterized a total of 119 RR Lyrae variables (96 RRab (RR0) and 23 RRc(RR1)) in M33. Using the properties of 83 RR Lyrae stars (65 RRab and 18 RRc) in the innermost ACS field (hereafter DISK2), we find mean periods of = 0.553 ± 0.008 (error1) ± 0.05 (error2) and = 0.325 ± 0.008 (error1) ± 0.05 (error2), where the `error1' value represents the standard error of the mean and the `error2' value is based on the error of an individual RRL period calculated from our synthetic light curve simulations. The distribution of RRab periods and the frequency of RRc stars (Nc=n(c)/n(abc)=0.22) strongly suggest that these RR Lyraes follow the general characteristics of...

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Research paper thumbnail of MEASURABLE RELATIONSHIP BETWEEN BRIGHT GALAXIES AND THEIR FAINT COMPANIONS IN WHL J085910.0+294957, A GALAXY CLUSTER AT z = 0.30: VESTIGES OF INFALLEN GROUPS?

The Astrophysical Journal, 2014

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Research paper thumbnail of The Early Chemical Enrichment Histories of Two Sculptor Group Dwarf Galaxies as Revealed by RR Lyrae Variables

The Astrophysical Journal, 2014

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Research paper thumbnail of The RR Lyrae Variable Population in the Phoenix Dwarf Galaxy

The Astrophysical Journal, 2014

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Research paper thumbnail of Globular Clusters in the Outer Galactic Halo: AM-1 and Palomar 14

The Astronomical Journal, 2008

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Research paper thumbnail of Wiyn Open Cluster Study II: Wide-Field CCD Photometry of the Old Open Cluster NGC 6819

The Astrophysical Journal, 2012

Bookmarks Related papers MentionsView impact

Research paper thumbnail of 1.11. A photometric study of two galactic bulge globular clusters

Symposium - International Astronomical Union, 1998

We present a comparative study of two metal-rich globular clusters in the Galactic bulge, NGC 631... more We present a comparative study of two metal-rich globular clusters in the Galactic bulge, NGC 6316 and NGC 6624, based on Washington CCD photometry. These two clusters are very close to the Galactic center. NGC 6624 is known to be dynamically in a post-core-collapse stage, while NGC 6316 is not. CMT1T2 CCD images of these clusters were obtained at the CTIO 0.9m telescope. We adopt the reddening values of E(B – V) = 0.61 for NGC 6316 and E(B – V) = 0.26 for NGC 6624 in this study.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Exploring the nature and synchronicity of early cluster formation in the Large Magellanic Cloud V: Multiple Populations in ancient Globular Clusters

We examine four ancient Large Magellanic Cloud (LMC) globular clusters (GCs) for evidence of mult... more 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 1841, and NGC 2257 all show evidence for a redder, secondary population along the main-sequence. Reticulum does not show evidence for the presence of a redder population, but this GC has the least number of stars and Monte Carlo simulations indicate that the sample of main sequence stars is too small to robustly infer whether a redder population exists in this cluster. The second, redder, population of the other three clusters constitutes ∼30-40% of the total population along the main-sequence. This brings the total number of ancient LMC GCs with known split or broadened main-sequences to five. However, unlike for Hodge 11 and NGC 2210 (see arXiv:1904.01434), none of the clusters show evidence for multiple populations in the horizontal bra...

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Accepted to The Astrophysical Journal Preprint typeset using LATEX style emulateapj v. 12/16/11 THE EARLY CHEMICAL ENRICHMENT HISTORIES OF TWO SCULPTOR GROUP DWARF GALAXIES AS

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Preprint typeset using LATEX style emulateapj v. 12/16/11 WIYN OPEN CLUSTER STUDY LII: WIDE-FIELD CCD PHOTOMETRY OF THE OLD OPEN CLUSTER

Bookmarks Related papers MentionsView impact

Research paper thumbnail of 8 Accepted by the Astronomical Journal Globular Clusters in the Outer Galactic Halo: AM-1 and

Bookmarks Related papers MentionsView impact

Research paper thumbnail of VizieR Online Data Catalog: RR Lyrae variables in M33 (Tanakul+, 2017)

Bookmarks Related papers MentionsView impact

Research paper thumbnail of The Carnegie-Chicago Hubble Program. I. A New Approach to the Distance Ladder Using Only Distance Indicators of Population II

arXiv: Cosmology and Nongalactic Astrophysics, 2016

We present an overview of the Carnegie-Chicago Hubble Program, an ongoing program to obtain a 3 p... more We present an overview of the Carnegie-Chicago Hubble Program, an ongoing program to obtain a 3 per cent measurement of the Hubble constant using alternative methods to the traditional Cepheid distance scale. We aim to establish a completely independent route to the Hubble constant using RR Lyrae variables, the tip of the red giant branch (TRGB), and Type Ia supernovae (SNe Ia). This alternative distance ladder can be applied to galaxies of any Hubble Type, of any inclination, and, utilizing old stars in low density environments, is robust to the degenerate effects of metallicity and interstellar extinction. Given the relatively small number of SNe Ia host galaxies with independently measured distances, these properties provide a great systematic advantage in the measurement of the Hubble constant via the distance ladder. Initially, the accuracy of our value of the Hubble constant will be set by the five Galactic RR Lyrae calibrators with Hubble Space Telescope Fine-Guidance Sensor ...

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Research paper thumbnail of HST Study of ESO 149-G003, a nearby dwarf irregular galaxy

Bookmarks Related papers MentionsView impact