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Comment on "Fermi-LAT Galactic Center Excess Morphology of Dark Matter in Simulations of the Milky Way Galaxy"
Kevork N. Abazajian, Jason Kumar, Oscar Macias
Muru et al. [Phys. Rev. Lett. 135, 161005 (2025)] conclude from the HESTIA constrained simulations that the -ray morphologies of the Galactic Center Excess predicted by dark mat…
Geminga and Monogem in the CTAO Era: Probing TeV Halos and Cosmic-Ray Transport
Youyou Li, Oscar Macias, Manuela Vecchi +1
TeV halos around Geminga and Monogem (B0656+14) reveal regions of strongly suppressed diffusion near middle-aged pulsars. Determining the sizes and magnetic-field strengths of thes…
Chasing Gravitational Waves with the Cherenkov Telescope Array
Jarred Gershon Green, Alessandro Carosi, Lara Nava +563
The detection of gravitational waves from a binary neutron star merger by Advanced LIGO and Advanced Virgo (GW170817), along with the discovery of the electromagnetic counterparts…
Variability studies of active galactic nuclei from the long-term monitoring program with the Cherenkov Telescope Array
Guillaume Grolleron, Josefa Becerra González, Jonathan Biteau +13
Blazars are active galactic nuclei (AGN) with a relativistic jet oriented toward the observer. This jet is composed of accelerated particles which can display emission over the ent…
TeV gamma-ray sensitivity to velocity-dependent dark matter models in the Galactic Center
Alessandro Montanari, Oscar Macias, Emmanuel Moulin
The center of the Milky Way is a prime site to search for signals of dark matter (DM) annihilation due to its proximity and expected high concentration of DM. The amplification of…
Dark matter searches in dwarf spheroidal galaxies with the Cherenkov Telescope Array
Francesco Gabriele Saturni, Michele Doro, Aldo Morselli +1
Dark matter (DM) is one of the major components in the Universe. However, at present its existence is still only inferred through indirect astronomical observations. DM particles c…
Prospective Dark Matter Annihilation Signals From the Sagittarius Dwarf Spheroidal
Thomas A. A. Venville, Alan R. Duffy, Roland M. Crocker +2
The Sagittarius Dwarf Spheroidal galaxy (Sgr) is investigated as a target for DM annihilation searches utilising J-factor distributions calculated directly from a high-resolution h…
Gamma-ray emission from the Sagittarius Dwarf Spheroidal galaxy due to millisecond pulsars
Roland M. Crocker, Oscar Macias, Dougal Mackey +13
The Fermi Bubbles are giant, gamma-ray emitting lobes emanating from the nucleus of the Milky Way discovered in ~1-100 GeV data collected by the Large Area Telescope on board the F…
The Andromeda Gamma-Ray Excess: Background Systematics of the Millisecond Pulsars and Dark Matter Interpretations
Fabian Zimmer, Oscar Macias, Shin'ichiro Ando +2
Since the discovery of an excess in gamma rays in the direction of M31, its cause has been unclear. Published interpretations focus on a dark matter or stellar related origin. Stud…
Assessing the Impact of Hydrogen Absorption on the Characteristics of the Galactic Center Excess
Martin Pohl, Oscar Macias, Phaedra Coleman +1
We present a new reconstruction of the distribution of atomic hydrogen in the inner Galaxy that is based on explicit radiation-transport modelling of line and continuum emission an…
Measuring the smearing of the Galactic 511 keV signal: positron propagation or supernova kicks?
Thomas Siegert, Roland M. Crocker, Oscar Macias +4
We use 15 years of -ray data from INTEGRAL/SPI in a refined investigation of the morphology of the Galactic bulge positron annihilation signal. Our spatial analysis confirms tha…
Millisecond Pulsars from Accretion Induced Collapse as the Origin of the Galactic Centre Gamma-ray Excess Signal
Anuj Gautam, Roland M. Crocker, Lilia Ferrario +4
Gamma-ray data from the Fermi-Large Area Telescope reveal an unexplained, apparently diffuse, signal from the Galactic bulge that peaks near 2 GeV with an approximately spherical i…
Cherenkov Telescope Array sensitivity to the putative millisecond pulsar population responsible for the Galactic center excess
Oscar Macias, Harm van Leijen, Deheng Song +3
The leading explanation of the Galactic center -ray excess is the extended emission from a unresolved population of millisecond pulsars (MSPs) in the Galactic b…
Evidence for a high-energy tail in the gamma-ray spectra of globular clusters
Deheng Song, Oscar Macias, Shunsaku Horiuchi +2
Millisecond pulsars are very likely the main source of gamma-ray emission from globular clusters. However, the relative contributions of two separate emission processes--curvature…
Comparing the Galactic Bulge and Galactic Disk Millisecond Pulsars
Harrison Ploeg, Chris Gordon, Roland Crocker +1
The Galactic Center Excess (GCE) is an extended gamma-ray source in the central region of the Galaxy found in Fermi Large Area Telescope (Fermi-LAT) data. One of the leading explan…
Prospects for Heavy WIMP Dark Matter with CTA: the Wino and Higgsino
Lucia Rinchiuso, Oscar Macias, Emmanuel Moulin +2
TeV-scale particles that couple to the standard model through the weak force represent a compelling class of dark matter candidates. The search for such Weakly Interacting Massive…
Foreground Mismodeling and the Point Source Explanation of the Fermi Galactic Center Excess
Malte Buschmann, Nicholas L. Rodd, Benjamin R. Safdi +4
The Fermi Large Area Telescope has observed an excess of ~GeV energy gamma rays from the center of the Milky Way, which may arise from near-thermal dark matter annihilation. Firmly…
Probing heavy dark matter decays with multi-messenger astrophysical data
Koji Ishiwata, Oscar Macias, Shin'ichiro Ando +1
We set conservative constraints on decaying dark matter particles with masses spanning a very wide range ( GeV). For this we use multimessenger observations of cosmic…
Inverse Compton emission from millisecond pulsars in the Galactic bulge
Deheng Song, Oscar Macias, Shunsaku Horiuchi
Analyses of Fermi Gamma-Ray Space Telescope data have revealed a source of excess diffuse gamma rays towards the Galactic center that extends up to roughly 20 degrees in latit…
Strong Evidence that the Galactic Bulge is Shining in Gamma Rays
Oscar Macias, Shunsaku Horiuchi, Manoj Kaplinghat +3
There is growing evidence that the Galactic Center Excess identified in the -LAT gamma-ray data arises from a population of faint astrophysical sources. We provide…
Consistency Between the Luminosity Function of Resolved Millisecond Pulsars and the Galactic Center Excess
Harrison Ploeg, Chris Gordon, Roland Crocker +1
Fermi Large Area Telescope data reveal an excess of GeV gamma rays from the direction of the Galactic Center and bulge. Several explanations have been proposed for this excess incl…
Galactic Bulge Preferred Over Dark Matter for the Galactic Center Gamma-Ray Excess
Oscar Macias, Chris Gordon, Roland M. Crocker +4
An anomalous gamma-ray excess emission has been found in Fermi Large Area Telescope data covering the centre of the Galaxy. Several theories have been proposed for this `Galactic C…
The Spatial Morphology of the Secondary Emission in the Galactic Center Gamma-Ray Excess
Thomas Lacroix, Oscar Macias, Chris Gordon +3
Excess GeV gamma rays from the Galactic Center (GC) have been measured with the Fermi Large Area Telescope (LAT). The presence of the GC excess (GCE) appears to be robust with resp…
Can Cosmic Rays Interacting With Molecular Clouds Explain The Galactic Center Gamma-Ray Excess?
Chris Gordon, Oscar Macias
The Fermi Large Area Telescope data appear to have an excess of gamma rays from the inner 150 pc of the Galactic Center (GC). The main explanations proposed for this are: an unreso…