A stacking survey of gamma-ray pulsars

Author:

Song YuzheORCID,Paglione Timothy A D123,Tan Joshua34,Lee-Georgescu Charles4,Herrera Danisbel35

Affiliation:

1. Physics Program, The Graduate Center, City University of New York , 365 Fifth Ave., New York, NY 10016 , USA

2. Department of Earth & Physical Sciences, York College, City University of New York , 94-20 Guy R. Brewer Blvd., Jamaica, NY 11451 , USA

3. Department of Astrophysics, American Museum of Natural History , Central Park West at 79th Street, New York, NY 10024 , USA

4. Department of Natural Sciences, LaGuardia Community College, City University of New York , 31-10 Thomson Ave., Long Island City, NY 11101 , USA

5. Department of Physics, New York University , 726 Broadway, New York, NY 10003 , USA

Abstract

ABSTRACT We report on a likelihood-stacking search for γ-ray pulsars at 362 high-latitude locations that coincide with known radio pulsar positions. We observe a stacked signal conservatively 2.5σ over the background. Stacking their likelihood profiles in spectral parameter space implies a pulsar-like spectral index and a characteristic flux a factor of 2 below the Fermi Large Area Telescope point-source sensitivity, assuming isotropic/unbeamed emission from all sample pulsars. The same procedures performed on empty control fields indicate that the pulsars as a population can be distinguished from the background with a Δ(TS) = 28, where TS refers to test statistic, at the peak location (or 4.8σ), and the stacked spectra of the control fields are distinctly softer than those of the pulsars. This study also probes a unique region of parameter space populated by low $\dot{E}$ pulsars, most of which have no γ-ray ephemeris available, and is sensitive to high duty cycles. We also discuss the possible γ-ray emission mechanism from such pulsars.

Funder

NSF

Professional Staff Congress and City University of New York

Australian Research Council

American Museum of Natural History

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

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