IRTS Observation of the Near-Infrared Spectrum of the Zodiacal Light

Publications of the Astronomical Society of Japan

Matsumoto, Toshio²  Narita, Katsuyuki⁴  Tanaka, Masahiro⁴  Kawada, Mitsunobu²  Murakami, Hiroshi²  Noda, Manabu³  Matsuura, Shuji¹ 

[1] Kansai Advanced Research Center, Communications Research Laboratory, 588-2 Iwaoka, Nishi-ku, Kobe 651-24;The Institute of Space and Astronautical Science, 3-1-1 Yoshinodai, Sagamihara, Kanagawa 229 E-mail (TM):;Nagoya Municipal Industrial Research Institute, 3-4-41 Rokuban, Asuta-ku, Nagoya 456;Department of Astrophysics, School of Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-01

关键词: "Infrared: diffuse emission";    "Infrared: spectra";    Spacecraft;    "Zodiacal light";   

DOI  :  10.1093/pasj/48.5.L47

学科分类：天文学(综合)

来源: Oxford University Press

【 摘 要 】

Wepresentthenear-infraredobservationofthezodiacallightwiththeIRTS(InfraredTelescopeinSpace),asmallcryogenicallycooledorbitalinfraredtelescope.Theobservedspectraoftheskybrightnessatwavelengthsfrom1.4μmto4.0μmarecharacterizedbyasmoothstellar-likespectrumatwavelengthsshorterthan3.2μm,andenhancedemissionatthelongwavelengths,whichisattributedtothermalemissionfrominterplanetarydust(IPD).Themeasuredskybrightnesshasacleardependenceontheeclipticlatitude,implyingthatthezodiacallightisadominantemissioncomponentofthenear-infraredsky.Thespectrumofthezodiacallight,itself,wasobtainedbysubtractingotheremissioncomponents.Althoughitisfairlyclosetothesolarspectrumatwavelengthsbetween1.8and3.2μm,itclearlyshowsadecrementinthescatteringefficiencyattheshort-wavelengthend.Thezodiacallightat1.4–3.2μmisabouttwiceasbrightasthatextrapolatedfromopticalmeasurements.Theseresultsindicatethatlargedustisresponsibleforthenear-infraredzodiacallight;theyalsosuggestthattheIPDthathasaspectralreflectancesimilartotheS-typeasteroidscouldberesponsibleforthenear-infraredzodiacallight.

【 授权许可】

Unknown