A Two-Phase Low-velocity Outflow in the Seyfert 1 Galaxy Ark~564

Abstract

The Seyfert 1 galaxy Ark 564 was observed with Chandra high energy transmission gratings for 250 ks. We present the high resolution X-ray spectrum that shows several associated absorption lines. The photoionization model requires two warm absorbers with two different ionization states (logU=0.39\pm0.03 and logU=-0.99\pm0.13), both with moderate outflow velocities (~100 km s^-1) and relatively low line of sight column densities (logNH=20.94 and 20.11 cm^-2). The high ionization phase produces absorption lines of OVII, OVIII, NeIX, NeX, MgXI, FeXVII and FeXVIII while the low ionization phase produces lines at lower energies (OVI & OVII). The pressure--temperature equilibrium curve for the Ark 564 absorber does not have the typical "S" shape, even if the metallicity is super-solar; as a result the two warm-absorber phases do not appear to be in pressure balance. This suggests that the continuum incident on the absorbing gas is perhaps different from the observed continuum. We also estimated the mass outflow rate and the associated kinetic energy and find it to be at most 0.006% of the bolometric luminosity of Ark~564. Thus it is highly unlikely that these outflows provide significant feedback required by the galaxy formation models.

31 pages, 11 figures, in press

References in corpus (7)

• A huge reservoir of ionized gas around the Milky Way: Accounting for the Missing Mass?
• An investigation of the origin of soft X-ray excess emission from Narrow-line Seyfert 1 galaxies Akn564 and Mrk1044
• An axisymmetric hydrodynamical model for the torus wind in AGN. II: X-ray excited funnel flow
• XMM-Newton observation of the NLS1 Galaxy Ark 564: I. Spectral analysis of the time-average spectrum
• Exploring the Nuclear Environment of the NLS1 Galaxy Arakelian 564 with XMM-Newton RGS
• Spectral variability analysis of an XMM-Newton observation of Ark 564
• The emission line spectrum of the UV deficient quasar Ton 34: evidence of shock excitation?

Cited by in corpus (15)

• Discovery of Relativistic Outflow in the Seyfert Galaxy Ark 564
• Detection of high velocity outflows in Seyfert 1 galaxy Mrk 590
• Narrow absorption lines with two observations of Sloan Digital Sky Survey
• The effect of UV/Soft X-ray excess emission on the warm absorber properties of Active Galactic Nuclei -- A case study of IRAS 13349+2438
• Emergences of C IV narrow absorption troughs in the quasar SDSS J095254.10+021932.8
• Revealing a hard X-ray spectral component that reverberates within one light hour of the central supermassive black hole in Ark 564
• Catalog of narrow C IV absorption lines in BOSS (II): for quasars with zem > 2.4
• Dusty plasma in active galactic nuclei
• Catalog of narrow $CIV$ absorption lines in BOSS (I): for quasars with $z_{em}\le 2.4$
• The ionised X-ray outflowing torus in ESO 323-G77: low-ionisation clumps confined by homogeneous warm absorbers
• Probing the photoionised outflow in the NLS1 Ark 564: An XMM-Newton view
• The XMM-Newton and NuSTAR view of IRASF11119+3257. I Detection of multiple UFO components and a very cold corona
• Hubble Space Telescope Observations of BALQSO Ton 34 Reveal a Connection between the Broad Line Region and the BAL Outflow
• Unravelling the origin of extended radio emission in narrow-line Seyfert 1 galaxies with the JVLA
• Ionization Distributions in Outflows of Active Galaxies: Universal Trends and Prospect of Future XRISM Observations