تقرير
MALS SALT-NOT survey of MIR-selected powerful radio-bright AGN at 0
التفاصيل البيبلوغرافية
العنوان:
MALS SALT-NOT survey of MIR-selected powerful radio-bright AGN at 0
المؤلفون:
Gupta, N., Shukla, G., Srianand, R., Krogager, J-. K., Noterdaeme, P., Baker, A. J., Combes, F., Fynbo, J. P. U., Momjian, E., Hilton, M., Hussain, T., Moodley, K., Petitjean, P., Chen, H. -W., Deka, P., Dutta, R., Jose, J., Jozsa, G. I. G., Kaski, C., Klockner, H. -R., Knowles, K., Sikhosana, S., Wagenveld, J.
سنة النشر:
2021
المجموعة:
Astrophysics
مصطلحات موضوعية:
Astrophysics - Astrophysics of Galaxies
الوصف:
We present results of an optical spectroscopic survey using SALT and NOT to build a WISE mid-infrared color-based, dust-unbiased sample of powerful radio-bright ($>$200 mJy at 1.4 GHz) AGN for the MeerKAT Absorption Line Survey (MALS). Our sample has 250 AGN (median $z=1.8$) showing emission lines, 26 with no emission lines, and 27 without optical counterparts. Overall, our sample is fainter ($\Delta i$=0.6 mag) and redder ($\Delta(g-i)$=0.2 mag) than radio-selected quasars, and representative of fainter quasar population detected in optical surveys. About 20% of the sources are narrow line AGN (NLAGN) $-$ 65% of these, at $z < 0.5$ are galaxies without strong nuclear emission, and 10% at $z>1.9$, have emission line ratios similar to radio galaxies. The farthest NLAGN in our sample is M1513$-$2524 ($z_{em}=3.132$), and the largest (size$\sim$330 kpc) is M0909$-$3133 ($z_{em}=0.884$). We discuss in detail 110 AGN at $1.9 < z < 3.5$. Despite representing the radio loudest quasars (median $R$=3685), their Eddington ratios are similar to the SDSS quasars having lower $R$. We detect 4 CIV BALQSOs, all among AGN with least $R$, and highest black hole masses and Eddington ratios. The BAL detection rate ($4^{+3}_{-2}$%) is consistent with that seen in extremely powerful ($L_{1.4GHz}>10^{25}$ WHz$^{-1}$) quasars. Using optical light-curves, radio polarization and $\gamma$-ray detections, we identify 7 high-probability BL Lacs. We also summarize the full MALS footprint to search for HI 21-cm and OH 18-cm lines at $z<2$.
Comment: 62 pages, 15 figures and 3 tables; accepted in ApJ (updated the redshift of M1312-2026 to z=0.977)
نوع الوثيقة:
Working Paper
DOI:
10.3847/1538-4357/ac4220
URL الوصول:
http://arxiv.org/abs/2107.09705
رقم الأكسشن:
edsarx.2107.09705
قاعدة البيانات:
arXiv
| العنوان: | MALS SALT-NOT survey of MIR-selected powerful radio-bright AGN at 0 |
|---|---|
| المؤلفون: | Gupta, N., Shukla, G., Srianand, R., Krogager, J-. K., Noterdaeme, P., Baker, A. J., Combes, F., Fynbo, J. P. U., Momjian, E., Hilton, M., Hussain, T., Moodley, K., Petitjean, P., Chen, H. -W., Deka, P., Dutta, R., Jose, J., Jozsa, G. I. G., Kaski, C., Klockner, H. -R., Knowles, K., Sikhosana, S., Wagenveld, J. |
| سنة النشر: | 2021 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - Astrophysics of Galaxies |
| الوصف: | We present results of an optical spectroscopic survey using SALT and NOT to build a WISE mid-infrared color-based, dust-unbiased sample of powerful radio-bright ($>$200 mJy at 1.4 GHz) AGN for the MeerKAT Absorption Line Survey (MALS). Our sample has 250 AGN (median $z=1.8$) showing emission lines, 26 with no emission lines, and 27 without optical counterparts. Overall, our sample is fainter ($\Delta i$=0.6 mag) and redder ($\Delta(g-i)$=0.2 mag) than radio-selected quasars, and representative of fainter quasar population detected in optical surveys. About 20% of the sources are narrow line AGN (NLAGN) $-$ 65% of these, at $z < 0.5$ are galaxies without strong nuclear emission, and 10% at $z>1.9$, have emission line ratios similar to radio galaxies. The farthest NLAGN in our sample is M1513$-$2524 ($z_{em}=3.132$), and the largest (size$\sim$330 kpc) is M0909$-$3133 ($z_{em}=0.884$). We discuss in detail 110 AGN at $1.9 < z < 3.5$. Despite representing the radio loudest quasars (median $R$=3685), their Eddington ratios are similar to the SDSS quasars having lower $R$. We detect 4 CIV BALQSOs, all among AGN with least $R$, and highest black hole masses and Eddington ratios. The BAL detection rate ($4^{+3}_{-2}$%) is consistent with that seen in extremely powerful ($L_{1.4GHz}>10^{25}$ WHz$^{-1}$) quasars. Using optical light-curves, radio polarization and $\gamma$-ray detections, we identify 7 high-probability BL Lacs. We also summarize the full MALS footprint to search for HI 21-cm and OH 18-cm lines at $z<2$. Comment: 62 pages, 15 figures and 3 tables; accepted in ApJ (updated the redshift of M1312-2026 to z=0.977) |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.3847/1538-4357/ac4220 |
| URL الوصول: | http://arxiv.org/abs/2107.09705 |
| رقم الأكسشن: | edsarx.2107.09705 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.3847/1538-4357/ac4220 |
|---|