Publications of the Astronomical Society of Japan | |
IRTS Observation of the Near-Infrared Spectrum of the Zodiacal Light | |
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.
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