Zobrazeno 1 - 10
of 282
pro vyhledávání: '"Gallagher, John. S."'
Publikováno v:
ApJL 975 L35 2024
The recent observation of high-energy neutrinos from the Galactic plane implies an abundant population of hadronic cosmic-ray sources in the Milky Way. We explore the role of the coronae of accreting stellar-mass black holes as such astroparticle emi
Externí odkaz:
http://arxiv.org/abs/2410.02119
Autor:
Calzetti, Daniela, Adamo, Angela, Linden, Sean T., Gregg, Benjamin, Krumholz, Mark R., Bajaj, Varun, Bik, Arjan, Cignoni, Michele, Correnti, Matteo, Elmegreen, Bruce, Vieira, Helena Faustino, Gallagher, John S., Grasha, Kathryn, Gutermuth, Robert A., Johnson, Kelsey E., Messa, Matteo, Melinder, Jens, Ostlin, Goran, Pedrini, Alex, Sabbi, Elena, Smith, Linda J., Tosi, Monica
New JWST near-infrared imaging of the nearby galaxy NGC 628 from the Cycle 1 program JWST-FEAST is combined with archival JWST mid-infrared imaging to calibrate the 21 $\mu$m emission as a star formation rate indicator (SFR) at $\sim$120 pc scales. T
Externí odkaz:
http://arxiv.org/abs/2406.01831
Autor:
Pedrini, Alex, Adamo, Angela, Calzetti, Daniela, Bik, Arjan, Gregg, Benjamin, Linden, Sean T., Bajaj, Varun, Ryon, Jenna E., Ali, Ahmad A., Bortolini, Giacomo, Correnti, Matteo, Elmegreen, Bruce G., Elmegreen, Debra Meloy, Gallagher, John S., Grasha, Kathryn, Gutermuth, Robert A., Johnson, Kelsey E., Melinder, Jens, Messa, Matteo, Östlin, Göran, Sabbi, Elena, Smith, Linda J., Tosi, Monica, Vieira, Helena Faustino
We investigate the emergence phase of young star clusters in the nearby spiral galaxy NGC 628. We use JWST NIRCam and MIRI observations to create spatially resolved maps of the Pa$\alpha$-1.87 $\mu$m and Br$\alpha$-4.05 $\mu$m hydrogen recombination
Externí odkaz:
http://arxiv.org/abs/2406.01666
Autor:
Gregg, Benjamin, Calzetti, Daniela, Adamo, Angela, Bajaj, Varun, Ryon, Jenna E., Linden, Sean T., Correnti, Matteo, Cignoni, Michele, Messa, Matteo, Sabbi, Elena, Gallagher, John S., Grasha, Kathryn, Pedrini, Alex, Gutermuth, Robert A., Melinder, Jens, Kotulla, Ralf, Pérez, Gustavo, Krumholz, Mark R., Bik, Arjan, Östlin, Göran, Johnson, Kelsey E., Bortolini, Giacomo, Smith, Linda J., Tosi, Monica, Maji, Subhransu, Vieira, Helena Faustino
We present maps of ionized gas (traced by Pa$\alpha$ and Br$\alpha$) and 3.3 $\mu$m Polycyclic Aromatic Hydrocarbon (PAH) emission in the nearby spiral galaxy NGC 628, derived from new JWST/NIRCam data from the FEAST survey. With this data, we invest
Externí odkaz:
http://arxiv.org/abs/2405.09667
Autor:
Bortolini, G., Cignoni, M., Sacchi, E., Tosi, M., Annibali, F., Pascale, R., Bellazzini, M., Calzetti, D., Adamo, A., Dale, Daniel. A., Fumagalli, M., Gallagher, John. S., Grasha, K., Johnson, Kelsey E., Linden, Sean. T., Messa, M., Östlin, G., Sabbi, E., Wofford, A.
We study the resolved stellar populations and derive the star formation history of NGC 5474, a peculiar star-forming dwarf galaxy at a distance of $\sim 7$ Mpc, using Hubble Space Telescope Advanced Camera for Surveys data from the Legacy Extragalact
Externí odkaz:
http://arxiv.org/abs/2311.08160
Publikováno v:
The Astrophysical Journal, Volume 956, Number 1, 2023
High-energy neutrinos are detected by the IceCube Observatory in the direction of NGC 1068, the archetypical type II Seyfert galaxy. The neutrino flux, surprisingly, is more than an order of magnitude higher than the $\gamma$-ray upper limits at meas
Externí odkaz:
http://arxiv.org/abs/2307.07121
The Galactic diffuse emission (GDE) is formed when cosmic rays leave the sources where they were accelerated, diffusively propagate in the Galactic magnetic field, and interact with the interstellar medium and interstellar radiation field. GDE in $\g
Externí odkaz:
http://arxiv.org/abs/2306.17275
Autor:
Elmegreen, Debra Meloy, Elmegreen, Bruce G., Gallagher, John S., Kotulla, Ralf, Almeida, Jorge Sanchez, Munoz-Tunon, Casiana, Caon, Nicola, Rafelski, Marc, Sunnquist, Ben, Revalski, Mitchell, Andersen, Morten
Tadpole galaxies are metal-poor dwarfs with typically one dominant star-forming region, giving them a head-tail structure when inclined. A metallicity drop in the head suggests that gas accretion with even lower metallicity stimulated the star format
Externí odkaz:
http://arxiv.org/abs/2211.09292
Autor:
Hess, Kelley M., Kotulla, Ralf, Chen, Hao, Carignan, Claude, Gallagher, John S., Jarrett, T. H., Kraan-Korteweg, Renée C.
Cluster substructure and ram pressure stripping in individual galaxies are among the primary evidence for the ongoing growth of galaxy clusters as they accrete galaxies and groups from their surroundings. We present a multi-wavelength study of the ce
Externí odkaz:
http://arxiv.org/abs/2209.05605
The diffuse flux of cosmic neutrinos has been measured by the IceCube Observatory from TeV to PeV energies. We show that an improved characterization of this flux at the lower energies, TeV and sub-TeV, reveals important information on the nature of
Externí odkaz:
http://arxiv.org/abs/2205.03740