Hubble space telescope ultraviolet spectroscopy of 14 low-redshift quasars

Rajib Ganguly, Michael S. Brotherton, Nahum Arav, Sara R. Heap, Lutz Wisotzki, Thomas L. Aldcroft, Danielle Alloin, Ehud Behar, Gabriela Canalizo, D. Michael Crenshaw, Martijn De Kool, Kenneth Chambers, Gerald Cecil, Eleni Chatzichristou, John Evererr, Jack Gabel, C. Martin Gaskell, Emmanuel Galliano, Richard F. Green, Patrick B. HallDean C. Hines, Vesa T. Junkkarinen, Jelle S. Kaastra, Mary Elizabeth Kaiser, Demosthenes Kazanas, Arieh Konigl, Kirk T. Korista, Gerard A. Kriss, Ari Laor, Karen M. Leighly, Smita Mathur, Patrick Ogle, Daniel Proga, Bassem Sabra, Ran Sivron, Stephanie Snedden, Randal Telfer, Marianne Vestergaard

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Abstract

We present low-resolution ultraviolet spectra of 14 low-redshift (z em ≲ 0.8) quasars observed with the Hubble Space Telescope STIS as part of a Snapshot project to understand the relationship between quasar outflows and luminosity. By design, all observations cover the C IV emission line. Ten of the quasars are from the Hamburg-ESO catalog, three are from the Palomar-Green catalog, and one is from the Parkes catalog. The sample contains a few interesting quasars, including two broad absorption line (BAL) quasars (HE 0143-3535 and HE 0436-2614), one quasar with a mini-BAL (HE 1105-0746), and one quasar with associated narrow absorption (HE 0409-5004). These BAL quasars are among the brightest known (although not the most luminous) since they lie at zem <0.8. We compare the properties of these BAL quasars to the zem <0.5 Palomar-Green and zem > 1-4 Large Bright Quasar Survey samples. By design, our objects sample luminosities in between these two surveys, and our four absorbed objects are consistent with the v ∼ L0.62 relation derived by Laor & Brandt (2002). Another quasar, HE 0441-2826, contains extremely weak emission lines, and our spectrum is consistent with a simple power-law continuum. The quasar is radio-loud but has a steep spectral index and a lobe-dominated morphology, which argues against it being a blazar. The unusual spectrum of this quasar resembles the spectra of the quasars PG 1407+265, SDSS J1136+0242, and PKS 1004+13, for which several possible explanations have been entertained.

Original languageEnglish (US)
Pages (from-to)479-486
Number of pages8
JournalAstronomical Journal
Volume133
Issue number2
DOIs
StatePublished - Feb 1 2007

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All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Ganguly, R., Brotherton, M. S., Arav, N., Heap, S. R., Wisotzki, L., Aldcroft, T. L., Alloin, D., Behar, E., Canalizo, G., Michael Crenshaw, D., De Kool, M., Chambers, K., Cecil, G., Chatzichristou, E., Evererr, J., Gabel, J., Martin Gaskell, C., Galliano, E., Green, R. F., ... Vestergaard, M. (2007). Hubble space telescope ultraviolet spectroscopy of 14 low-redshift quasars. Astronomical Journal, 133(2), 479-486. https://doi.org/10.1086/510129