Millisecond Pulsar Origin of the Galactic Center Excess and Extended Gamma-Ray Emission from Andromeda: A Closer Look
Abstract
A 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 andmore »
- Authors:
-
- Univ. of Nova Gorica, Nova Gorica (Slovenia)
- Chinese Academy of Sciences, Kunming (People's Republic of China); Chinese Academy of Sciences, Beijing (People's Republic of China)
- Univ. Savoie Mont Blanc & CNRS, Annecy Cedex (France)
- Univ. of Wisconsin, Madison, WI (United States)
- Univ. of Nova Gorica, Nova Gorica (Slovenia); Instituto Nazionale di Fisica Nucleare - Sezione Trieste, Trieste (Italy)
- Univ. Paul Sabatier, Toulouse Cedex (France)
- Stanford Univ., Stanford, CA (United States)
- Univ. of Maryland Baltimore County (UMBC), Baltimore, MD (United States); NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States)
- Univ. of Novi Sad, Novi Sad (Serbia)
- Publication Date:
- Research Org.:
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1468959
- Grant/Contract Number:
- AC02-76SF00515
- Resource Type:
- Accepted Manuscript
- Journal Name:
- The Astrophysical Journal (Online)
- Additional Journal Information:
- Journal Name: The Astrophysical Journal (Online); Journal Volume: 862; Journal Issue: 1; Journal ID: ISSN 1538-4357
- Publisher:
- Institute of Physics (IOP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS; gamma rays: galaxies; Local Group; pulsars: general
Citation Formats
Eckner, Christopher, Hou, Xian, Serpico, Pasquale D., Winter, Miles, Zaharijas, Gabrijela, Martin, Pierrick, Mauro, Mattia di, Mirabal, Nestor, Petrovic, Jovana, Prodanovic, Tijana, and Vandenbroucke, Justin. Millisecond Pulsar Origin of the Galactic Center Excess and Extended Gamma-Ray Emission from Andromeda: A Closer Look. United States: N. p., 2018.
Web. doi:10.3847/1538-4357/aac029.
Eckner, Christopher, Hou, Xian, Serpico, Pasquale D., Winter, Miles, Zaharijas, Gabrijela, Martin, Pierrick, Mauro, Mattia di, Mirabal, Nestor, Petrovic, Jovana, Prodanovic, Tijana, & Vandenbroucke, Justin. Millisecond Pulsar Origin of the Galactic Center Excess and Extended Gamma-Ray Emission from Andromeda: A Closer Look. United States. https://doi.org/10.3847/1538-4357/aac029
Eckner, Christopher, Hou, Xian, Serpico, Pasquale D., Winter, Miles, Zaharijas, Gabrijela, Martin, Pierrick, Mauro, Mattia di, Mirabal, Nestor, Petrovic, Jovana, Prodanovic, Tijana, and Vandenbroucke, Justin. Wed .
"Millisecond Pulsar Origin of the Galactic Center Excess and Extended Gamma-Ray Emission from Andromeda: A Closer Look". United States. https://doi.org/10.3847/1538-4357/aac029. https://www.osti.gov/servlets/purl/1468959.
@article{osti_1468959,
title = {Millisecond Pulsar Origin of the Galactic Center Excess and Extended Gamma-Ray Emission from Andromeda: A Closer Look},
author = {Eckner, Christopher and Hou, Xian and Serpico, Pasquale D. and Winter, Miles and Zaharijas, Gabrijela and Martin, Pierrick and Mauro, Mattia di and Mirabal, Nestor and Petrovic, Jovana and Prodanovic, Tijana and Vandenbroucke, Justin},
abstractNote = {A 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. In conclusion, we also comment on the limitations of our model and on future perspectives for improved diagnostics.},
doi = {10.3847/1538-4357/aac029},
journal = {The Astrophysical Journal (Online)},
number = 1,
volume = 862,
place = {United States},
year = {Wed Jul 25 00:00:00 EDT 2018},
month = {Wed Jul 25 00:00:00 EDT 2018}
}
Web of Science
Figures / Tables:
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Bayesian model comparison and analysis of the Galactic disc population of gamma-ray millisecond pulsars
journal, September 2018
- Bartels, R. T.; Edwards, T. D. P.; Weniger, C.
- Monthly Notices of the Royal Astronomical Society, Vol. 481, Issue 3
Search for -ray emission from dark matter particle interactions from the Andromeda and Triangulum galaxies with the Fermi Large Area Telescope
journal, June 2019
- Di Mauro, Mattia; Hou, Xian; Eckner, Christopher
- Physical Review D, Vol. 99, Issue 12
Probing the Fermi-LAT GeV Excess with Gravitational Waves
journal, March 2019
- Calore, Francesca; Regimbau, Tania; Serpico, Pasquale Dario
- Physical Review Letters, Vol. 122, Issue 8
Massive White Dwarfs in the Galactic Center: A Chandra X-Ray Spectroscopy of Cataclysmic Variables
journal, September 2019
- Xu, Xiao-jie; Li, Zhiyuan; Zhu, Zhenlin
- The Astrophysical Journal, Vol. 882, Issue 2
Millisecond Pulsars and the Gamma-Ray Excess in Andromeda
journal, January 2019
- Fragione, Giacomo; Antonini, Fabio; Gnedin, Oleg Y.
- The Astrophysical Journal, Vol. 871, Issue 1
Bayesian Model Comparison and Analysis of the Galactic Disk Population of Gamma-Ray Millisecond Pulsars
text, January 2018
- Bartels, R. T.; Edwards, T. D. P.; Weniger, C.
- arXiv
Probing the Fermi-LAT GeV excess with gravitational waves
text, January 2018
- Calore, Francesca; Regimbau, Tania; Serpico, Pasquale Dario
- arXiv
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