Millisecond Pulsar Origin of the Galactic Center Excess and Extended Gamma-Ray Emission from Andromeda: A Closer Look

Simple item page
dc.contributor.authorEckner, Christopher
dc.contributor.authorHou, Xian
dc.contributor.authorSerpico, Pasquale D.
dc.contributor.authorWinter, Miles
dc.contributor.authorZaharijas, Gabrijela
dc.contributor.authorMartin, Pierrick
dc.contributor.authorMauro, Mattia Di
dc.contributor.authorMirabal, Nestor
dc.contributor.authorPetrovic, Jovana
dc.contributor.authorProdanovic, Tijana
dc.contributor.authorVandenbroucke, Justin
dc.date.accessioned2020-08-28T17:03:02Z
dc.date.available2020-08-28T17:03:02Z
dc.date.issued2018-07-25
dc.description.abstractA new measurement of a spatially extended gamma-ray signal from the center of the Andromeda galaxy (M31) has recently been published by the Fermi-LAT collaboration, reporting that the emission broadly resembles the so-called Galactic center excess (GCE) of the Milky Way (MW). The weight of the evidence is steadily accumulating on a millisecond pulsar (MSPs) origin for the GCE. These elements prompt us to compare these observations with what is, perhaps, the simplest model for an MSP population, which is solely obtained by rescaling of the MSP luminosity function that is determined in the local MW disk via the respective stellar mass of the systems. Remarkably, we find that without free fitting parameters, this model can account for both the energetics and the morphology of the GCE within uncertainties. For M31, the estimated luminosity due to primordial MSPs is expected to only contribute about a quarter of the detected emission, although a stronger contribution cannot be excluded given the large uncertainties. If correct, the model predicts that the M31 disk emission due to MSPs is not far below the present upper bound. We also discuss additional refinements of this simple model. Using the correlation between globular cluster gamma-ray luminosity and stellar encounter rate, we gauge the dynamical MSP formation in the bulge. This component is expected to contribute to the GCE only at a level of <=5%, it could affect the signal's morphology. We also comment on the limitations of our model and on future perspectives for improved diagnostics.en_US
dc.description.sponsorshipWe thank F. Calore, C. Weniger, and especially R. Bartels, A. Clerici and D. Malyshev for discussions and feedback on a preliminary version of this manuscript. M.D.M. acknowledges support by the NASA Fermi Guest Investigator Program 2014 through the Fermi multi-year Large Program N. 81303 (P.I. E. Charles). X.H. is supported by the National Natural Science Foundation of China through grant Nos. 11503078, 11661161010 and 11673060. P.M. acknowledges support from the Centre National dEtudes Spatiales. P.S. acknowledges support from Agence Nationale de la Recherche under the contract ANR-15-IDEX-02, project "Unveiling the Galactic centre mystery", GCEM (PI: F. Calore).en_US
dc.description.urihttps://iopscience.iop.org/article/10.3847/1538-4357/aac029en_US
dc.format.extent14 pagesen_US
dc.genrejournal articles preprintsen_US
dc.identifierdoi:10.13016/m211zx-2dc2
dc.identifier.citationChristopher Eckner et al., Millisecond Pulsar Origin of the Galactic Center Excess and Extended Gamma-Ray Emission from Andromeda: A Closer Look, The Astrophysical Journal, Volume 862, Number 1, doi: 10.3847/1538-4357/aac029en_US
dc.identifier.uri10.3847/1538-4357/aac029
dc.identifier.urihttp://hdl.handle.net/11603/19537
dc.language.isoen_USen_US
dc.publisherIOPen_US
dc.relation.isAvailableAtThe University of Maryland, Baltimore County (UMBC)
dc.relation.ispartofUMBC Physics Department Collection
dc.relation.ispartofUMBC Faculty Collection
dc.relation.ispartofUMBC Joint Center for Earth Systems Technology (JCET)
dc.relation.ispartofUMBC Center for Space Sciences and Technology (CSST) / Center for Research and Exploration in Space Sciences & Technology II (CRSST II)
dc.rightsThis item is likely protected under Title 17 of the U.S. Copyright Law. Unless on a Creative Commons license, for uses protected by Copyright Law, contact the copyright holder or the author.
dc.rights© 2018. The American Astronomical Society. All rights reserved.
dc.titleMillisecond Pulsar Origin of the Galactic Center Excess and Extended Gamma-Ray Emission from Andromeda: A Closer Looken_US
dc.typeTexten_US

Files

Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
1711.05127.pdf
Size:
849.62 KB
Format:
Adobe Portable Document Format
Description:
Download
License bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
license.txt
Size:
2.56 KB
Format:
Item-specific license agreed upon to submission
Description:
Download

Collections

UMBC Physics Department
UMBC Center for Space Sciences and Technology (CSST) / Center for Research and Exploration in Space Sciences & Technology II (CRSST II)
UMBC Faculty Collection
UMBC Joint Center for Earth Systems Technology (JCET)