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首页> 外文期刊>The Astrophysical journal >Planetary Nebulae and Stellar Kinematics in the Flattened Elliptical Galaxy NGC 1344*
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Planetary Nebulae and Stellar Kinematics in the Flattened Elliptical Galaxy NGC 1344*

机译:扁平椭圆星系NGC 1344中的行星状星云和恒星运动学*

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We present photometric and kinematic information obtained by measuring 197 planetary nebulae (PNs) discovered in the flattened Fornax elliptical galaxy NGC 1344 (also known as NGC 1340) with an on-band, off-band, and grism+on-band filter technique. We build the PN luminosity function (PNLF) and use it to derive a distance modulus m - M = 31.4 ± 0.18, which is slightly smaller than, but in good agreement with, the surface brightness fluctuation distance. The PNLF also provides an estimate of the specific PN formation rate: (6 ± 3) × 10-12 PNs yr-1 L. If we combine the positional information from the on-band image with PN positions measured on the grism+on-band image, we can measure the radial velocities of 195 PNs, some of them distant more than three effective radii from the center of NGC 1344. We complement this data set with stellar kinematics derived from integrated spectra along the major and minor axes and parallel to the major axis of NGC 1344. The line-of-sight velocity dispersion profile indicates the presence of a dark matter halo around this galaxy.
机译:我们提供了光度学和运动学信息,这些信息是通过使用带内,带外和Grism + on-band滤镜技术测量在扁平的Fornax椭圆星系NGC 1344(也称为NGC 1340)中发现的197个行星状星云(PN)获得的。我们建立PN发光度函数(PNLF),并使用它来推导距离模数m-M = 31.4±0.18,该距离模数略小于表面亮度波动距离,但与表面亮度波动距离非常吻合。 PNLF还提供了特定PN形成速率的估计值:(6±3)×10-12 PNs yr-1L。如果我们将带内图像的位置信息与在grism + on-on上测量的PN位置相结合在波段图像中,我们可以测量195个PN的径向速度,其中一些距离NGC 1344中心的有效半径超过三个有效半径。我们用恒星运动学来补充此数据集,该运动学是沿着长轴和短轴并平行于NGC 1344的主轴。视线速度色散曲线表明该星系周围存在暗物质晕。

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