Anti-Correlation of the Near-Infrared and X-Ray Variations of the Microquasar GRS 1915+105 in Soft State

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dc.creatorArai, Akira
dc.creatorUemura, Makoto
dc.creatorSasada, Mahito
dc.creatorTrushkin, Sergei A.
dc.creatorUeda, Yoshihiro
dc.creatorTakahashi, Hiromitsu
dc.creatorKawabata, Koji S.
dc.creatorYamanaka, Masayuki
dc.creatorNagae, Osamu
dc.creatorIkejiri, Yuki
dc.creatorSakimoto, Kiyoshi
dc.creatorMatsui, Risako
dc.creatorOhsugi, Takashi
dc.creatorYamashita, Takuya
dc.creatorIsogai, Mizuki
dc.creatorFukazawa, Yasushi
dc.creatorMizuno, Tsunefumi
dc.creatorKatagiri, Hideaki
dc.creatorOkita, Kiichi
dc.creatorYoshida, Michitoshi
dc.creatorYanagisawa, Kenshi
dc.creatorSato, Shuji
dc.creatorKino, Masaru
dc.creatorSadakane, Kozo
dc.date2009-04-06
dc.date.accessioned2026-07-07T13:01:11Z
dc.date.available2026-07-07T13:01:11Z
dc.descriptionWe report detailed, long term near-infrared (NIR) light curves of GRS 1915+105 in 2007-2008, covering its long "soft state" for the first time. From our NIR monitoring and the X-ray data of the All Sky Monitor (ASM) onboard Rossi X-ray Timing Explorer (RXTE), we discovered that the NIR flux dropped by > 1 mag during short X-ray flares with a time-scale of days. With the termination of the soft state, the H-Ks color reddened and the anti-correlation pattern was broken. The observed H-Ks color variation suggests that the dominant NIR source was an accretion disk during the soft state. The short X-ray flares during the soft state were associated with spectral hardening in X-rays and increasing radio emission indicating jet ejection. The temporal NIR fading during the X-ray flares, hence, implies a sudden decrease of the contribution of the accretion disk when the jet is ejected.
dc.description5 pages, 2 figures, accepted for PASJ
dc.identifierhttps://arxiv.org/abs/0904.1020
dc.identifierhttp://arxiv.org/abs/0904.1020
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/226076
dc.subjectHigh Energy Astrophysical Phenomena
dc.titleAnti-Correlation of the Near-Infrared and X-Ray Variations of the Microquasar GRS 1915+105 in Soft State
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