Search Publications
Narrow-line Seyfert 1 galaxies in Sloan Digital Sky Survey: a new optical spectroscopic catalogue
Stalin, C. S.; Saikia, D. J.; Domínguez, Alberto +1 more
Narrow-line Seyfert 1 (NLSy1) galaxies are an enigmatic class of active galactic nuclei (AGN) that exhibit peculiar multiwavelength properties across the electromagnetic spectrum. For example, these sources have allowed us to explore the innermost regions of the central engine of AGN using X-ray observations and have also provided clues about the …
Galactic 'Snake' IRDC G11.11-0.12: a site of multiple hub-filament systems and colliding filamentary clouds
Dewangan, L. K.; Sharma, Saurabh; Eswaraiah, C. +3 more
To probe star formation processes, we present a multiscale and multiwavelength investigation of the 'Snake' nebula/infrared dark cloud G11.11-0.12 (hereafter, G11; length ~27 pc). Spitzer images hint at the presence of subfilaments (in absorption), and reveal four infrared-dark hub-filament system (HFS) candidates (extent < 6 pc) towards G11, w…
[X/Fe] Marks the Spot: Mapping Chemical Azimuthal Variations in the Galactic Disk with APOGEE
Laporte, Chervin F. P.; Price-Whelan, Adrian M.; Horta, Danny +4 more
Chemical cartography of the Galactic disk provides insights into its structure and assembly history over cosmic time. In this work, we use chemical cartography to explore chemical gradients and azimuthal substructure in the Milky Way disk with giant stars from Apache Point Observatory Galactic Evolution Experiment (APOGEE) DR17. We confirm the exi…
A Two-Component Probability Distribution Function Describes the Mid-IR Emission from the Disks of Star-forming Galaxies
Sandstrom, Karin M.; Ramambason, Lise; Leroy, Adam K. +28 more
High-resolution JWST-MIRI images of nearby spiral galaxies reveal emission with complex substructures that trace dust heated both by massive young stars and the diffuse interstellar radiation field. We present high angular (0.″85) and physical resolution (20-80 pc) measurements of the probability distribution function (PDF) of mid-infrared (mid-IR…
Global Parameters of Eight W UMa-type Binary Systems
Poro, Atila; Paki, Ehsan; Michel, Raul +1 more
Multiband photometric investigations for eight binary systems of the W Ursae Majoris-type are presented. Six systems are presented for the first time to analyze their light curves. All the analyzed systems have a temperature below 5000 K and an orbital period of less than 0.28 days. We extracted primary and secondary minima from the ground-based o…
IXPE observation of PKS 2155–304 reveals the most highly polarized blazar
Kaaret, Philip; Wu, Kinwah; Enoto, Teruaki +133 more
We report the X-ray polarization properties of the high-synchrotron-peaked (HSP) blazar PKS 2155‑304 based on observations with the Imaging X-ray Polarimetry Explorer (IXPE). We observed the source between Oct 27 and Nov 7, 2023. We also conducted an extensive contemporaneous multiwavelength (MW) campaign. We find that during the first half (T
Robust constraints on feebly interacting particles using XMM-Newton
Carenza, Pierluca; Balaji, Shyam; Luque, Pedro De la Torre
During galactic supernova (SN) explosions, a large amount of feebly interacting particles (FIPs) may be produced. In this work we analyze electrophilic FIPs with masses in the MeV-range that escape from SN and decay into electron-positron pairs, causing an exotic leptonic injection. This contribution adds up to known components, leading to an unex…
New insights into the role of AGNs in forming the cluster red sequence
Koyama, Yusei; Kodama, Tadayuki; Shimakawa, Rhythm +7 more
As a considerable investment of time from various telescope facilities was dedicated toward studying the Spiderweb protocluster at z = 2.2, it so far remains one of the most extensively studied protocluster. We report here the latest results in this field, adding a new dimension to previous research on cluster formation at high redshift. Previous …
GA-NIFS: the interplay between merger, star formation, and chemical enrichment in MACS1149-JD1 at z = 9.11 with JWST/NIRSpec
Maiolino, R.; Perna, M.; Cresci, G. +15 more
We present JWST/NIRSpec integral-field spectroscopy observations of the z $\sim$ 9.11 lensed galaxy MACS1149-JD1, as part of the GA-NIFS programme. The data were obtained with both the G395H grating (R $\sim$ 2700) and the prism (R $\sim$ 100). This target shows a main elongated UV-bright clump and a secondary component detected in continuum emiss…
NEOMOD 2: An updated model of Near-Earth Objects from a decade of Catalina Sky Survey observations
Granvik, Mikael; Chodas, Paul W.; Nesvorný, David +9 more
Catalina Sky Survey (CSS) is a major survey of Near-Earth Objects (NEOs). In a recent work, we used CSS observations from 2005-2012 to develop a new population model of NEOs (NEOMOD). CSS's G96 telescope was upgraded in 2016 and detected over 10,000 unique NEOs since then. Here we characterize the NEO detection efficiency of G96 and use G96's NEO …