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2023ApJ...944L..29A - Astrophys. J., 944, L29 (2023/February-3)

HAWC Detection of a TeV Halo Candidate Surrounding a Radio-quiet Pulsar.

ALBERT A., ALFARO R., ARTEAGA-VELAZQUEZ J.C., AYALA SOLARES H.A., BELMONT-MORENO E., CAPISTRAN T., CARRAMINANA A., CASANOVA S., COTZOMI J., COUTINO DE LEON S., DE LA FUENTE E., DE LEON C., DIAZ HERNANDEZ R., DUVERNOIS M.A., DIAZ-VELEZ J.C., ESPINOZA C., FAN K.L., FRAIJA N., FANG K., GARCIA-GONZALEZ J.A., GARFIAS F., JARDIN-BLICQ A., GONZALEZ M.M., GOODMAN J.A., HARDING J.P., HERNANDEZ S., HUANG D., HUEYOTL-ZAHUANTITLA F., HUNTEMEYER P., IRIARTE A., JOSHI V., LARA A., LEE J., LEON VARGAS H., LINNEMANN J.T., LONGINOTTI A.L., LUIS-RAYA G., MALONE K., MARTINEZ O., MARTINEZ-CASTRO J., MATTHEWS J.A., MORALES-SOTO J.A., MORENO E., MOSTAFA M., NAYERHODA A., NELLEN L., NEWBOLD M., NISA M.U., PEREZ ARAUJO Y., SON Y., PEREZ-PEREZ E.G., RHO C.D., ROSA-GONZALEZ D., SANDOVAL A., SCHNEIDER M., SERNA-FRANCO J., SMITH A.J., SPRINGER R.W., TOLLEFSON K., TORRES I., TORRES-ESCOBEDO R., WANG X., WHITAKER K., WILLOX E., ZHOU H. (The HAWC Collaboration)

Abstract (from CDS):

Extended very-high-energy (VHE; 0.1-100 TeV) γ-ray emission has been observed around several middle-aged pulsars and referred to as “TeV halos.” Their formation mechanism remains under debate. It is also unknown whether they are ubiquitous or related to a certain subgroup of pulsars. With 2321 days of observation, the High Altitude Water Cherenkov (HAWC) Gamma-Ray Observatory detected VHE γ-ray emission at the location of the radio-quiet pulsar PSR J0359+5414 with >6σ significance. By performing likelihood tests with different spectral and spatial models and comparing the TeV spectrum with multiwavelength observations of nearby sources, we show that this excess is consistent with a TeV halo associated with PSR J0359+5414, though future observation of HAWC and multiwavelength follow-ups are needed to confirm this nature. This new halo candidate is located in a noncrowded region in the outer galaxy. It shares similar properties to the other halos but its pulsar is younger and radio-quiet. Our observation implies that TeV halos could commonly exist around pulsars and their formation does not depend on the configuration of the pulsar magnetosphere.

Abstract Copyright: © 2023. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Pulsars - Gamma-ray astronomy - High energy astrophysics

Simbad objects: 7

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