Gagandeep S. Anand
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View article: Converging on the Cepheid Metallicity Dependence: Implications of Nonstandard Gaia Parallax Recalibration on Distance Measures
Converging on the Cepheid Metallicity Dependence: Implications of Nonstandard Gaia Parallax Recalibration on Distance Measures Open
By comparing Cepheid brightnesses with geometric distance measures including Gaia EDR3 parallaxes, most recent analyses conclude metal-rich Cepheids are brighter, quantified as γ ∼ −0.2 mag dex −1 . While the value of γ has little impact o…
View article: The First RELHIC? Cloud-9 is a Starless Gas Cloud <sup>*</sup>
The First RELHIC? Cloud-9 is a Starless Gas Cloud <sup>*</sup> Open
Five-hundred-meter Aperture Spherical Telescope observations have recently identified a compact H i cloud (hereafter Cloud-9) in the vicinity of the spiral galaxy M94. This identification has been confirmed independently by Very Large Arra…
View article: The Perfect Host: JWST Cepheid Observations in a Background-free Type Ia Supernova Host Confirm No Bias in Hubble-constant Measurements
The Perfect Host: JWST Cepheid Observations in a Background-free Type Ia Supernova Host Confirm No Bias in Hubble-constant Measurements Open
Cycle 1 JWST observations of Cepheids in Type Ia supernova (SN Ia) hosts resolved their red-giant-dominated near-infrared backgrounds, sharply reducing crowding and showing that photometric bias in lower-resolution Hubble Space Telescope (…
View article: The Hidden Life of Stars: Embedded Beginnings to AGB Endings in the PHANGS-JWST Sample. I. Catalog of Mid-IR Sources
The Hidden Life of Stars: Embedded Beginnings to AGB Endings in the PHANGS-JWST Sample. I. Catalog of Mid-IR Sources Open
We present a multiwavelength catalog of mid-infrared-selected compact sources in 19 nearby galaxies, combining JWST NIRCam/MIRI, HST UV-optical broadband, H$α$ narrow-band, and ALMA CO observations. We detect 24,945 compact sources at 21 $…
View article: The infrared jet of M87 observed with JWST
The infrared jet of M87 observed with JWST Open
Aims. We present the first JWST+NIRCam images of the giant elliptical active galaxy M87 and its jet at 0.90, 1.50, 2.77, and 3.56 μm. We analysed the large-scale jet structure, identifying prominent components, and we determined the near-i…
View article: The First RELHIC? Cloud-9 is a Starless Gas Cloud
The First RELHIC? Cloud-9 is a Starless Gas Cloud Open
Five-hundred-meter Aperture Spherical Telescope (FAST) observations have recently identified a compact HI cloud (hereafter Cloud-9) in the vicinity of the spiral galaxy M94. This identification has been confirmed independently by Very Larg…
View article: JAGB 2.0: Improved Constraints on the J-region Asymptotic Giant Branch–based Hubble Constant from an Expanded Sample of JWST Observations
JAGB 2.0: Improved Constraints on the J-region Asymptotic Giant Branch–based Hubble Constant from an Expanded Sample of JWST Observations Open
The J-region asymptotic giant branch (JAGB) is an overdensity of stars in the near-infrared, attributed to carbon-rich AGB stars, and recently used as a standard candle for measuring extragalactic distances and the Hubble constant. Using J…
View article: The MUSE view of the Sculptor galaxy: Survey overview and the luminosity function of planetary nebulae
The MUSE view of the Sculptor galaxy: Survey overview and the luminosity function of planetary nebulae Open
The Sculptor galaxy, NGC 253, is the southern massive star-forming disk galaxy that is closest to the Milky Way. We present a new 103-pointing MUSE mosaic of this galaxy that covers most of its star-forming disk up to 0.75 × R 25 . With an…
View article: The TRGB−SBF Project. III. Refining the HST Surface Brightness Fluctuation Distance Scale Calibration with JWST
The TRGB−SBF Project. III. Refining the HST Surface Brightness Fluctuation Distance Scale Calibration with JWST Open
The TRGB−SBF Project team is developing an independent distance ladder using a geometrical calibration of the tip of the red giant branch (TRGB) method in elliptical galaxies that can, in turn, be used to set the surface brightness fluctua…
View article: Genetic counseling for adult‐onset neurogenetic conditions in Hispanic/Latine communities: A qualitative study of barriers and facilitators from Hispanic/Latine genetic counselors' perspectives
Genetic counseling for adult‐onset neurogenetic conditions in Hispanic/Latine communities: A qualitative study of barriers and facilitators from Hispanic/Latine genetic counselors' perspectives Open
Hispanic/Latine (H/Le) individuals, despite being at higher risk for certain adult‐onset neurological conditions (AONCs) compared to non‐Hispanic white individuals, experience delays in accessing neurologic health services and are signific…
View article: The Complete Sample of Available SNe Ia Luminosity Calibrations from the TRGB Observed with either HST or JWST
The Complete Sample of Available SNe Ia Luminosity Calibrations from the TRGB Observed with either HST or JWST Open
Distance ladders which calibrate the luminosity of Type Ia supernovae (SNe Ia) currently provide the strongest constraints on the local value of H0. Recent studies from the Hubble Space Telescope (HST) and James Webb Space Telescope (JWST)…
View article: Polycyclic Aromatic Hydrocarbon and CO(2–1) Emission at 50–150 pc Scales in 70 Nearby Galaxies
Polycyclic Aromatic Hydrocarbon and CO(2–1) Emission at 50–150 pc Scales in 70 Nearby Galaxies Open
Combining Atacama Large Millimeter/submillimeter Array CO(2–1) mapping and JWST near- and mid-infrared imaging, we characterize the relationship between CO(2–1) and polycyclic aromatic hydrocarbon (PAH) emission at ≈100 pc resolution in 70…
View article: The TRGB–SBF Project. II. Resolving the Virgo Cluster with JWST
The TRGB–SBF Project. II. Resolving the Virgo Cluster with JWST Open
The Virgo Cluster is the nearest substantial cluster of galaxies to the Milky Way and a cornerstone of the extragalactic distance scale. Here, we present JWST/NIRCam observations that simultaneously cover the cores and halos of 10 galaxies…
View article: A Sizable Discrepancy in Ground-Based JAGB Distances to Nearby Galaxies
A Sizable Discrepancy in Ground-Based JAGB Distances to Nearby Galaxies Open
Recently, Freedman et al. (2024) report agreement of distances derived from the Tip of the Red Giant Branch (TRGB) and the J-Region Asymptotic Giant Branch (JAGB) at the 1$\%$ level for both nearby galaxies with ground-based imaging (0.5-4…
View article: JAGB 2.0: Improved Constraints on the J-region Asymptotic Giant Branch-based Hubble Constant from an Expanded Sample of JWST Observations
JAGB 2.0: Improved Constraints on the J-region Asymptotic Giant Branch-based Hubble Constant from an Expanded Sample of JWST Observations Open
The J-region Asymptotic Giant Branch (JAGB) is an overdensity of stars in the near-infrared, attributed to carbon-rich asymptotic giant branch stars, and recently used as a standard candle for measuring extragalactic distances and the Hubb…
View article: The Hubble Tension in Our Own Backyard: DESI and the Nearness of the Coma Cluster
The Hubble Tension in Our Own Backyard: DESI and the Nearness of the Coma Cluster Open
The Dark Energy Spectroscopic Instrument (DESI) collaboration measured a tight relation between the Hubble constant ( H 0 ) and the distance to the Coma cluster using the fundamental plane (FP) relation of the deepest, most homogeneous sam…
View article: Calibrating the Tully-Fisher Relation to Measure the Hubble Constant
Calibrating the Tully-Fisher Relation to Measure the Hubble Constant Open
Boubel et al. 2024 (B24) recently used the Tully-Fisher (TF) relation to measure calibrated distances in the Hubble flow and found $H_0= 73.3 \pm 2.1 (stat) \pm 3.5 (sys)$ km/s/Mpc. The large systematic uncertainty was the result of propag…
View article: JWST Validates HST Distance Measurements: Selection of Supernova Subsample Explains Differences in JWST Estimates of Local H <sub>0</sub>
JWST Validates HST Distance Measurements: Selection of Supernova Subsample Explains Differences in JWST Estimates of Local H <sub>0</sub> Open
We cross-check the Hubble Space Telescope (HST) Cepheid/Type Ia supernova (SN Ia) distance ladder, which yields the most precise local H 0 , against early James Webb Space Telescope (JWST) subsamples (∼1/4 of the HST sample) from SH0ES and…
View article: The Hubble Constant Anchor Galaxy NGC 4258: Metallicity and Distance from Blue Supergiants
The Hubble Constant Anchor Galaxy NGC 4258: Metallicity and Distance from Blue Supergiants Open
A quantitative spectroscopic study of blue supergiant stars in the Hubble constant anchor galaxy NGC 4258 is presented. The non-LTE analysis of Keck I telescope LRIS spectra yields a central logarithmic metallicity (in units of the solar v…
View article: Tip of the Red Giant Branch Distances with JWST. II. I-band Measurements in a Sample of Hosts of 10 Type Ia Supernova Match HST Cepheids
Tip of the Red Giant Branch Distances with JWST. II. I-band Measurements in a Sample of Hosts of 10 Type Ia Supernova Match HST Cepheids Open
The Hubble Tension, a >5 σ discrepancy between direct and indirect measurements of the Hubble constant ( H 0 ), has persisted for a decade and motivated intense scrutiny of the paths used to infer H 0 . Comparing independently derived dist…
View article: The Hubble constant anchor galaxy NGC 4258: metallicity and distance from blue supergiants
The Hubble constant anchor galaxy NGC 4258: metallicity and distance from blue supergiants Open
A quantitative spectroscopic study of blue supergiant stars in the Hubble constant anchor galaxy NGC 4258 is presented. The non-LTE analysis of Keck I telescope LRIS spectra yields a central logarithmic metallicity (in units of the solar v…
View article: Polycyclic Aromatic Hydrocarbon and CO(2-1) Emission at 50-150 pc Scales in 70 Nearby Galaxies
Polycyclic Aromatic Hydrocarbon and CO(2-1) Emission at 50-150 pc Scales in 70 Nearby Galaxies Open
Combining Atacama Large Millimeter/sub-millimeter Array CO(2-1) mapping and JWST near- and mid-infrared imaging, we characterize the relationship between CO(2-1) and polycyclic aromatic hydrocarbon (PAH) emission at ~100 pc resolution in 7…
View article: The Hubble Tension in our own Backyard: DESI and the Nearness of the Coma Cluster
The Hubble Tension in our own Backyard: DESI and the Nearness of the Coma Cluster Open
The Dark Energy Spectroscopic Instrument (DESI) collaboration measured a tight relation between the Hubble constant ($H_0$) and the distance to the Coma cluster using the fundamental plane (FP) relation of the deepest, most homogeneous sam…
View article: The TRGB-SBF Project. I. A Tip of the Red Giant Branch Distance to the Fornax Cluster with JWST
The TRGB-SBF Project. I. A Tip of the Red Giant Branch Distance to the Fornax Cluster with JWST Open
Differences between the local value of the Hubble constant measured via the distance ladder versus the value inferred from the cosmic microwave background with the assumption of the standard ΛCDM model have reached over 5 σ significance. T…
View article: Small Magellanic Cloud Cepheids Observed with the Hubble Space Telescope Provide a New Anchor for the SH0ES Distance Ladder
Small Magellanic Cloud Cepheids Observed with the Hubble Space Telescope Provide a New Anchor for the SH0ES Distance Ladder Open
We present phase-corrected photometric measurements of 88 Cepheid variables in the core of the Small Magellanic Cloud (SMC), the first sample obtained with the Hubble Space Telescope's (HST) Wide Field Camera 3, in the same homogeneous pho…
View article: The TRGB-SBF Project. II. Resolving the Virgo Cluster with JWST
The TRGB-SBF Project. II. Resolving the Virgo Cluster with JWST Open
The Virgo Cluster is the nearest substantial cluster of galaxies to the Milky Way and a cornerstone of the extragalactic distance scale. Here, we present JWST/NIRCam observations that simultaneously cover the cores and halos of ten galaxie…
View article: JWST Validates HST Distance Measurements: Selection of Supernova Subsample Explains Differences in JWST Estimates of Local H0
JWST Validates HST Distance Measurements: Selection of Supernova Subsample Explains Differences in JWST Estimates of Local H0 Open
JWST provides new opportunities to cross-check the HST Cepheid/SNeIa distance ladder, which yields the most precise local measure of H0. We analyze early JWST subsamples (~1/4 of the HST sample) from the SH0ES and CCHP groups, calibrated b…
View article: Tip of the Red Giant Branch Distances with JWST. II. I-band Measurements in a Sample of Hosts of 10 SN Ia Match HST Cepheids
Tip of the Red Giant Branch Distances with JWST. II. I-band Measurements in a Sample of Hosts of 10 SN Ia Match HST Cepheids Open
The Hubble Tension, a >5 sigma discrepancy between direct and indirect measurements of the Hubble constant (H0), has persisted for a decade and motivated intense scrutiny of the paths used to infer H0. Comparing independently-derived dista…
View article: PHANGS-JWST: Data-processing Pipeline and First Full Public Data Release
PHANGS-JWST: Data-processing Pipeline and First Full Public Data Release Open
The exquisite angular resolution and sensitivity of JWST are opening a new window for our understanding of the Universe. In nearby galaxies, JWST observations are revolutionizing our understanding of the first phases of star formation and …
View article: The TRGB-SBF Project. I. A Tip of the Red Giant Branch Distance to the Fornax Cluster with JWST
The TRGB-SBF Project. I. A Tip of the Red Giant Branch Distance to the Fornax Cluster with JWST Open
Differences between the local value of the Hubble constant measured via the distance ladder versus the value inferred from the cosmic microwave background with the assumption of the standard $Λ$CDM model have reached over 5$σ$ significance…